--- /dev/null
+Digital Signature Verification API
+
+CONTENTS
+
+1. Introduction
+2. API
+3. User-space utilities
+
+
+1. Introduction
+
+Digital signature verification API provides a method to verify digital signature.
+Currently digital signatures are used by the IMA/EVM integrity protection subsystem.
+
+Digital signature verification is implemented using cut-down kernel port of
+GnuPG multi-precision integers (MPI) library. The kernel port provides
+memory allocation errors handling, has been refactored according to kernel
+coding style, and checkpatch.pl reported errors and warnings have been fixed.
+
+Public key and signature consist of header and MPIs.
+
+struct pubkey_hdr {
+ uint8_t version; /* key format version */
+ time_t timestamp; /* key made, always 0 for now */
+ uint8_t algo;
+ uint8_t nmpi;
+ char mpi[0];
+} __packed;
+
+struct signature_hdr {
+ uint8_t version; /* signature format version */
+ time_t timestamp; /* signature made */
+ uint8_t algo;
+ uint8_t hash;
+ uint8_t keyid[8];
+ uint8_t nmpi;
+ char mpi[0];
+} __packed;
+
+keyid equals to SHA1[12-19] over the total key content.
+Signature header is used as an input to generate a signature.
+Such approach insures that key or signature header could not be changed.
+It protects timestamp from been changed and can be used for rollback
+protection.
+
+2. API
+
+API currently includes only 1 function:
+
+ digsig_verify() - digital signature verification with public key
+
+
+/**
+ * digsig_verify() - digital signature verification with public key
+ * @keyring: keyring to search key in
+ * @sig: digital signature
+ * @sigen: length of the signature
+ * @data: data
+ * @datalen: length of the data
+ * @return: 0 on success, -EINVAL otherwise
+ *
+ * Verifies data integrity against digital signature.
+ * Currently only RSA is supported.
+ * Normally hash of the content is used as a data for this function.
+ *
+ */
+int digsig_verify(struct key *keyring, const char *sig, int siglen,
+ const char *data, int datalen);
+
+3. User-space utilities
+
+The signing and key management utilities evm-utils provide functionality
+to generate signatures, to load keys into the kernel keyring.
+Keys can be in PEM or converted to the kernel format.
+When the key is added to the kernel keyring, the keyid defines the name
+of the key: 5D2B05FC633EE3E8 in the example bellow.
+
+Here is example output of the keyctl utility.
+
+$ keyctl show
+Session Keyring
+ -3 --alswrv 0 0 keyring: _ses
+603976250 --alswrv 0 -1 \_ keyring: _uid.0
+817777377 --alswrv 0 0 \_ user: kmk
+891974900 --alswrv 0 0 \_ encrypted: evm-key
+170323636 --alswrv 0 0 \_ keyring: _module
+548221616 --alswrv 0 0 \_ keyring: _ima
+128198054 --alswrv 0 0 \_ keyring: _evm
+
+$ keyctl list 128198054
+1 key in keyring:
+620789745: --alswrv 0 0 user: 5D2B05FC633EE3E8
+
+
+Dmitry Kasatkin
+06.10.2011
00-INDEX
- this file.
+LSM.txt
+ - description of the Linux Security Module framework.
SELinux.txt
- how to get started with the SELinux security enhancement.
Smack.txt
--- /dev/null
+Linux Security Module framework
+-------------------------------
+
+The Linux Security Module (LSM) framework provides a mechanism for
+various security checks to be hooked by new kernel extensions. The name
+"module" is a bit of a misnomer since these extensions are not actually
+loadable kernel modules. Instead, they are selectable at build-time via
+CONFIG_DEFAULT_SECURITY and can be overridden at boot-time via the
+"security=..." kernel command line argument, in the case where multiple
+LSMs were built into a given kernel.
+
+The primary users of the LSM interface are Mandatory Access Control
+(MAC) extensions which provide a comprehensive security policy. Examples
+include SELinux, Smack, Tomoyo, and AppArmor. In addition to the larger
+MAC extensions, other extensions can be built using the LSM to provide
+specific changes to system operation when these tweaks are not available
+in the core functionality of Linux itself.
+
+Without a specific LSM built into the kernel, the default LSM will be the
+Linux capabilities system. Most LSMs choose to extend the capabilities
+system, building their checks on top of the defined capability hooks.
+For more details on capabilities, see capabilities(7) in the Linux
+man-pages project.
+
+Based on http://kerneltrap.org/Linux/Documenting_Security_Module_Intent,
+a new LSM is accepted into the kernel when its intent (a description of
+what it tries to protect against and in what cases one would expect to
+use it) has been appropriately documented in Documentation/security/.
+This allows an LSM's code to be easily compared to its goals, and so
+that end users and distros can make a more informed decision about which
+LSMs suit their requirements.
+
+For extensive documentation on the available LSM hook interfaces, please
+see include/linux/security.h.
(5) LSM
The Linux Security Module allows extra controls to be placed over the
- operations that a task may do. Currently Linux supports two main
- alternate LSM options: SELinux and Smack.
+ operations that a task may do. Currently Linux supports several LSM
+ options.
- Both work by labelling the objects in a system and then applying sets of
+ Some work by labelling the objects in a system and then applying sets of
rules (policies) that say what operations a task with one label may do to
an object with another label.
config TCG_TIS
tristate "TPM Interface Specification 1.2 Interface"
+ depends on X86
---help---
If you have a TPM security chip that is compliant with the
TCG TIS 1.2 TPM specification say Yes and it will be accessible
config TCG_NSC
tristate "National Semiconductor TPM Interface"
+ depends on X86
---help---
If you have a TPM security chip from National Semiconductor
say Yes and it will be accessible from within Linux. To
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
+#include <linux/freezer.h>
#include "tpm.h"
}
#define TPM_DIGEST_SIZE 20
-#define TPM_ERROR_SIZE 10
#define TPM_RET_CODE_IDX 6
enum tpm_capabilities {
len = tpm_transmit(chip,(u8 *) cmd, len);
if (len < 0)
return len;
- if (len == TPM_ERROR_SIZE) {
- err = be32_to_cpu(cmd->header.out.return_code);
- dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
- return err;
- }
- return 0;
+ else if (len < TPM_HEADER_SIZE)
+ return -EFAULT;
+
+ err = be32_to_cpu(cmd->header.out.return_code);
+ if (err != 0)
+ dev_err(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
+
+ return err;
}
#define TPM_INTERNAL_RESULT_SIZE 200
}
EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
-void tpm_get_timeouts(struct tpm_chip *chip)
+int tpm_get_timeouts(struct tpm_chip *chip)
{
struct tpm_cmd_t tpm_cmd;
struct timeout_t *timeout_cap;
if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
be32_to_cpu(tpm_cmd.header.out.length)
!= sizeof(tpm_cmd.header.out) + sizeof(u32) + 4 * sizeof(u32))
- return;
+ return -EINVAL;
timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout;
/* Don't overwrite default if value is 0 */
rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
"attempting to determine the durations");
if (rc)
- return;
+ return rc;
if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
be32_to_cpu(tpm_cmd.header.out.length)
!= sizeof(tpm_cmd.header.out) + sizeof(u32) + 3 * sizeof(u32))
- return;
+ return -EINVAL;
duration_cap = &tpm_cmd.params.getcap_out.cap.duration;
chip->vendor.duration[TPM_SHORT] =
chip->vendor.duration_adjusted = true;
dev_info(chip->dev, "Adjusting TPM timeout parameters.");
}
+ return 0;
}
EXPORT_SYMBOL_GPL(tpm_get_timeouts);
-void tpm_continue_selftest(struct tpm_chip *chip)
+#define TPM_ORD_CONTINUE_SELFTEST 83
+#define CONTINUE_SELFTEST_RESULT_SIZE 10
+
+static struct tpm_input_header continue_selftest_header = {
+ .tag = TPM_TAG_RQU_COMMAND,
+ .length = cpu_to_be32(10),
+ .ordinal = cpu_to_be32(TPM_ORD_CONTINUE_SELFTEST),
+};
+
+/**
+ * tpm_continue_selftest -- run TPM's selftest
+ * @chip: TPM chip to use
+ *
+ * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
+ * a TPM error code.
+ */
+static int tpm_continue_selftest(struct tpm_chip *chip)
{
- u8 data[] = {
- 0, 193, /* TPM_TAG_RQU_COMMAND */
- 0, 0, 0, 10, /* length */
- 0, 0, 0, 83, /* TPM_ORD_ContinueSelfTest */
- };
+ int rc;
+ struct tpm_cmd_t cmd;
- tpm_transmit(chip, data, sizeof(data));
+ cmd.header.in = continue_selftest_header;
+ rc = transmit_cmd(chip, &cmd, CONTINUE_SELFTEST_RESULT_SIZE,
+ "continue selftest");
+ return rc;
}
-EXPORT_SYMBOL_GPL(tpm_continue_selftest);
ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
char *buf)
.ordinal = TPM_ORDINAL_PCRREAD
};
-int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
+static int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
{
int rc;
struct tpm_cmd_t cmd;
}
EXPORT_SYMBOL_GPL(tpm_pcr_extend);
+/**
+ * tpm_do_selftest - have the TPM continue its selftest and wait until it
+ * can receive further commands
+ * @chip: TPM chip to use
+ *
+ * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
+ * a TPM error code.
+ */
+int tpm_do_selftest(struct tpm_chip *chip)
+{
+ int rc;
+ u8 digest[TPM_DIGEST_SIZE];
+ unsigned int loops;
+ unsigned int delay_msec = 1000;
+ unsigned long duration;
+
+ duration = tpm_calc_ordinal_duration(chip,
+ TPM_ORD_CONTINUE_SELFTEST);
+
+ loops = jiffies_to_msecs(duration) / delay_msec;
+
+ rc = tpm_continue_selftest(chip);
+ /* This may fail if there was no TPM driver during a suspend/resume
+ * cycle; some may return 10 (BAD_ORDINAL), others 28 (FAILEDSELFTEST)
+ */
+ if (rc)
+ return rc;
+
+ do {
+ rc = __tpm_pcr_read(chip, 0, digest);
+ if (rc != TPM_WARN_DOING_SELFTEST)
+ return rc;
+ msleep(delay_msec);
+ } while (--loops > 0);
+
+ return rc;
+}
+EXPORT_SYMBOL_GPL(tpm_do_selftest);
+
int tpm_send(u32 chip_num, void *cmd, size_t buflen)
{
struct tpm_chip *chip;
}
EXPORT_SYMBOL_GPL(tpm_store_cancel);
+int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
+ wait_queue_head_t *queue)
+{
+ unsigned long stop;
+ long rc;
+ u8 status;
+
+ /* check current status */
+ status = chip->vendor.status(chip);
+ if ((status & mask) == mask)
+ return 0;
+
+ stop = jiffies + timeout;
+
+ if (chip->vendor.irq) {
+again:
+ timeout = stop - jiffies;
+ if ((long)timeout <= 0)
+ return -ETIME;
+ rc = wait_event_interruptible_timeout(*queue,
+ ((chip->vendor.status(chip)
+ & mask) == mask),
+ timeout);
+ if (rc > 0)
+ return 0;
+ if (rc == -ERESTARTSYS && freezing(current)) {
+ clear_thread_flag(TIF_SIGPENDING);
+ goto again;
+ }
+ } else {
+ do {
+ msleep(TPM_TIMEOUT);
+ status = chip->vendor.status(chip);
+ if ((status & mask) == mask)
+ return 0;
+ } while (time_before(jiffies, stop));
+ }
+ return -ETIME;
+}
+EXPORT_SYMBOL_GPL(wait_for_tpm_stat);
/*
* Device file system interface to the TPM
*
TPM_ADDR = 0x4E,
};
+#define TPM_WARN_DOING_SELFTEST 0x802
+#define TPM_HEADER_SIZE 10
extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr,
char *);
extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr,
ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *);
-extern void tpm_get_timeouts(struct tpm_chip *);
+extern int tpm_get_timeouts(struct tpm_chip *);
extern void tpm_gen_interrupt(struct tpm_chip *);
-extern void tpm_continue_selftest(struct tpm_chip *);
+extern int tpm_do_selftest(struct tpm_chip *);
extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
extern struct tpm_chip* tpm_register_hardware(struct device *,
const struct tpm_vendor_specific *);
extern void tpm_remove_hardware(struct device *);
extern int tpm_pm_suspend(struct device *, pm_message_t);
extern int tpm_pm_resume(struct device *);
-
+extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long,
+ wait_queue_head_t *);
#ifdef CONFIG_ACPI
extern struct dentry ** tpm_bios_log_setup(char *);
extern void tpm_bios_log_teardown(struct dentry **);
#include <linux/freezer.h>
#include "tpm.h"
-#define TPM_HEADER_SIZE 10
-
enum tis_access {
TPM_ACCESS_VALID = 0x80,
TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
return -EBUSY;
}
-static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
- wait_queue_head_t *queue)
-{
- unsigned long stop;
- long rc;
- u8 status;
-
- /* check current status */
- status = tpm_tis_status(chip);
- if ((status & mask) == mask)
- return 0;
-
- stop = jiffies + timeout;
-
- if (chip->vendor.irq) {
-again:
- timeout = stop - jiffies;
- if ((long)timeout <= 0)
- return -ETIME;
- rc = wait_event_interruptible_timeout(*queue,
- ((tpm_tis_status
- (chip) & mask) ==
- mask), timeout);
- if (rc > 0)
- return 0;
- if (rc == -ERESTARTSYS && freezing(current)) {
- clear_thread_flag(TIF_SIGPENDING);
- goto again;
- }
- } else {
- do {
- msleep(TPM_TIMEOUT);
- status = tpm_tis_status(chip);
- if ((status & mask) == mask)
- return 0;
- } while (time_before(jiffies, stop));
- }
- return -ETIME;
-}
-
static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
{
int size = 0, burstcnt;
while (size < count &&
- wait_for_stat(chip,
- TPM_STS_DATA_AVAIL | TPM_STS_VALID,
- chip->vendor.timeout_c,
- &chip->vendor.read_queue)
+ wait_for_tpm_stat(chip,
+ TPM_STS_DATA_AVAIL | TPM_STS_VALID,
+ chip->vendor.timeout_c,
+ &chip->vendor.read_queue)
== 0) {
burstcnt = get_burstcount(chip);
for (; burstcnt > 0 && size < count; burstcnt--)
goto out;
}
- wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
- &chip->vendor.int_queue);
+ wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
+ &chip->vendor.int_queue);
status = tpm_tis_status(chip);
if (status & TPM_STS_DATA_AVAIL) { /* retry? */
dev_err(chip->dev, "Error left over data\n");
status = tpm_tis_status(chip);
if ((status & TPM_STS_COMMAND_READY) == 0) {
tpm_tis_ready(chip);
- if (wait_for_stat
+ if (wait_for_tpm_stat
(chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b,
&chip->vendor.int_queue) < 0) {
rc = -ETIME;
count++;
}
- wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
- &chip->vendor.int_queue);
+ wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
+ &chip->vendor.int_queue);
status = tpm_tis_status(chip);
if (!itpm && (status & TPM_STS_DATA_EXPECT) == 0) {
rc = -EIO;
/* write last byte */
iowrite8(buf[count],
chip->vendor.iobase + TPM_DATA_FIFO(chip->vendor.locality));
- wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
- &chip->vendor.int_queue);
+ wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
+ &chip->vendor.int_queue);
status = tpm_tis_status(chip);
if ((status & TPM_STS_DATA_EXPECT) != 0) {
rc = -EIO;
if (chip->vendor.irq) {
ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
- if (wait_for_stat
+ if (wait_for_tpm_stat
(chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID,
tpm_calc_ordinal_duration(chip, ordinal),
&chip->vendor.read_queue) < 0) {
out:
itpm = rem_itpm;
tpm_tis_ready(chip);
+ /* some TPMs need a break here otherwise they will not work
+ * correctly on the immediately subsequent command */
+ msleep(chip->vendor.timeout_b);
release_locality(chip, chip->vendor.locality, 0);
return rc;
dev_dbg(dev, "\tData Avail Int Support\n");
/* get the timeouts before testing for irqs */
- tpm_get_timeouts(chip);
+ if (tpm_get_timeouts(chip)) {
+ dev_err(dev, "Could not get TPM timeouts and durations\n");
+ rc = -ENODEV;
+ goto out_err;
+ }
+
+ if (tpm_do_selftest(chip)) {
+ dev_err(dev, "TPM self test failed\n");
+ rc = -ENODEV;
+ goto out_err;
+ }
/* INTERRUPT Setup */
init_waitqueue_head(&chip->vendor.read_queue);
list_add(&chip->vendor.list, &tis_chips);
spin_unlock(&tis_lock);
- tpm_continue_selftest(chip);
return 0;
out_err:
ret = tpm_pm_resume(&dev->dev);
if (!ret)
- tpm_continue_selftest(chip);
+ tpm_do_selftest(chip);
return ret;
}
--- /dev/null
+/*
+ * Copyright (C) 2011 Nokia Corporation
+ * Copyright (C) 2011 Intel Corporation
+ *
+ * Author:
+ * Dmitry Kasatkin <dmitry.kasatkin@nokia.com>
+ * <dmitry.kasatkin@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ *
+ */
+
+#ifndef _DIGSIG_H
+#define _DIGSIG_H
+
+#include <linux/key.h>
+
+enum pubkey_algo {
+ PUBKEY_ALGO_RSA,
+ PUBKEY_ALGO_MAX,
+};
+
+enum digest_algo {
+ DIGEST_ALGO_SHA1,
+ DIGEST_ALGO_SHA256,
+ DIGEST_ALGO_MAX
+};
+
+struct pubkey_hdr {
+ uint8_t version; /* key format version */
+ time_t timestamp; /* key made, always 0 for now */
+ uint8_t algo;
+ uint8_t nmpi;
+ char mpi[0];
+} __packed;
+
+struct signature_hdr {
+ uint8_t version; /* signature format version */
+ time_t timestamp; /* signature made */
+ uint8_t algo;
+ uint8_t hash;
+ uint8_t keyid[8];
+ uint8_t nmpi;
+ char mpi[0];
+} __packed;
+
+#if defined(CONFIG_DIGSIG) || defined(CONFIG_DIGSIG_MODULE)
+
+int digsig_verify(struct key *keyring, const char *sig, int siglen,
+ const char *digest, int digestlen);
+
+#else
+
+static inline int digsig_verify(struct key *keyring, const char *sig,
+ int siglen, const char *digest, int digestlen)
+{
+ return -EOPNOTSUPP;
+}
+
+#endif /* CONFIG_DIGSIG */
+
+#endif /* _DIGSIG_H */
/* internal fields */
struct list_head link; /* link in types list */
+ struct lock_class_key lock_class; /* key->sem lock class */
};
extern struct key_type key_type_keyring;
--- /dev/null
+/* mpi.h - Multi Precision Integers
+ * Copyright (C) 1994, 1996, 1998, 1999,
+ * 2000, 2001 Free Software Foundation, Inc.
+ *
+ * This file is part of GNUPG.
+ *
+ * GNUPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GNUPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ *
+ * Note: This code is heavily based on the GNU MP Library.
+ * Actually it's the same code with only minor changes in the
+ * way the data is stored; this is to support the abstraction
+ * of an optional secure memory allocation which may be used
+ * to avoid revealing of sensitive data due to paging etc.
+ * The GNU MP Library itself is published under the LGPL;
+ * however I decided to publish this code under the plain GPL.
+ */
+
+#ifndef G10_MPI_H
+#define G10_MPI_H
+
+#include <linux/types.h>
+
+/* DSI defines */
+
+#define SHA1_DIGEST_LENGTH 20
+
+/*end of DSI defines */
+
+#define BYTES_PER_MPI_LIMB (BITS_PER_LONG / 8)
+#define BITS_PER_MPI_LIMB BITS_PER_LONG
+
+typedef unsigned long int mpi_limb_t;
+typedef signed long int mpi_limb_signed_t;
+
+struct gcry_mpi {
+ int alloced; /* array size (# of allocated limbs) */
+ int nlimbs; /* number of valid limbs */
+ int nbits; /* the real number of valid bits (info only) */
+ int sign; /* indicates a negative number */
+ unsigned flags; /* bit 0: array must be allocated in secure memory space */
+ /* bit 1: not used */
+ /* bit 2: the limb is a pointer to some m_alloced data */
+ mpi_limb_t *d; /* array with the limbs */
+};
+
+typedef struct gcry_mpi *MPI;
+
+#define MPI_NULL NULL
+
+#define mpi_get_nlimbs(a) ((a)->nlimbs)
+#define mpi_is_neg(a) ((a)->sign)
+
+/*-- mpiutil.c --*/
+MPI mpi_alloc(unsigned nlimbs);
+MPI mpi_alloc_secure(unsigned nlimbs);
+MPI mpi_alloc_like(MPI a);
+void mpi_free(MPI a);
+int mpi_resize(MPI a, unsigned nlimbs);
+int mpi_copy(MPI *copy, const MPI a);
+void mpi_clear(MPI a);
+int mpi_set(MPI w, MPI u);
+int mpi_set_ui(MPI w, ulong u);
+MPI mpi_alloc_set_ui(unsigned long u);
+void mpi_m_check(MPI a);
+void mpi_swap(MPI a, MPI b);
+
+/*-- mpicoder.c --*/
+MPI do_encode_md(const void *sha_buffer, unsigned nbits);
+MPI mpi_read_from_buffer(const void *buffer, unsigned *ret_nread);
+int mpi_fromstr(MPI val, const char *str);
+u32 mpi_get_keyid(MPI a, u32 *keyid);
+void *mpi_get_buffer(MPI a, unsigned *nbytes, int *sign);
+void *mpi_get_secure_buffer(MPI a, unsigned *nbytes, int *sign);
+int mpi_set_buffer(MPI a, const void *buffer, unsigned nbytes, int sign);
+
+#define log_mpidump g10_log_mpidump
+
+/*-- mpi-add.c --*/
+int mpi_add_ui(MPI w, MPI u, ulong v);
+int mpi_add(MPI w, MPI u, MPI v);
+int mpi_addm(MPI w, MPI u, MPI v, MPI m);
+int mpi_sub_ui(MPI w, MPI u, ulong v);
+int mpi_sub(MPI w, MPI u, MPI v);
+int mpi_subm(MPI w, MPI u, MPI v, MPI m);
+
+/*-- mpi-mul.c --*/
+int mpi_mul_ui(MPI w, MPI u, ulong v);
+int mpi_mul_2exp(MPI w, MPI u, ulong cnt);
+int mpi_mul(MPI w, MPI u, MPI v);
+int mpi_mulm(MPI w, MPI u, MPI v, MPI m);
+
+/*-- mpi-div.c --*/
+ulong mpi_fdiv_r_ui(MPI rem, MPI dividend, ulong divisor);
+int mpi_fdiv_r(MPI rem, MPI dividend, MPI divisor);
+int mpi_fdiv_q(MPI quot, MPI dividend, MPI divisor);
+int mpi_fdiv_qr(MPI quot, MPI rem, MPI dividend, MPI divisor);
+int mpi_tdiv_r(MPI rem, MPI num, MPI den);
+int mpi_tdiv_qr(MPI quot, MPI rem, MPI num, MPI den);
+int mpi_tdiv_q_2exp(MPI w, MPI u, unsigned count);
+int mpi_divisible_ui(const MPI dividend, ulong divisor);
+
+/*-- mpi-gcd.c --*/
+int mpi_gcd(MPI g, const MPI a, const MPI b);
+
+/*-- mpi-pow.c --*/
+int mpi_pow(MPI w, MPI u, MPI v);
+int mpi_powm(MPI res, MPI base, MPI exp, MPI mod);
+
+/*-- mpi-mpow.c --*/
+int mpi_mulpowm(MPI res, MPI *basearray, MPI *exparray, MPI mod);
+
+/*-- mpi-cmp.c --*/
+int mpi_cmp_ui(MPI u, ulong v);
+int mpi_cmp(MPI u, MPI v);
+
+/*-- mpi-scan.c --*/
+int mpi_getbyte(MPI a, unsigned idx);
+void mpi_putbyte(MPI a, unsigned idx, int value);
+unsigned mpi_trailing_zeros(MPI a);
+
+/*-- mpi-bit.c --*/
+void mpi_normalize(MPI a);
+unsigned mpi_get_nbits(MPI a);
+int mpi_test_bit(MPI a, unsigned n);
+int mpi_set_bit(MPI a, unsigned n);
+int mpi_set_highbit(MPI a, unsigned n);
+void mpi_clear_highbit(MPI a, unsigned n);
+void mpi_clear_bit(MPI a, unsigned n);
+int mpi_rshift(MPI x, MPI a, unsigned n);
+
+/*-- mpi-inv.c --*/
+int mpi_invm(MPI x, MPI u, MPI v);
+
+#endif /*G10_MPI_H */
* @reqprot contains the protection requested by the application.
* @prot contains the protection that will be applied by the kernel.
* @flags contains the operational flags.
+ * @addr contains virtual address that will be used for the operation.
+ * @addr_only contains a boolean: 0 if file-backed VMA, otherwise 1.
* Return 0 if permission is granted.
* @file_mprotect:
* Check permissions before changing memory access permissions.
static inline int security_inode_init_security(struct inode *inode,
struct inode *dir,
const struct qstr *qstr,
- initxattrs initxattrs,
+ const initxattrs initxattrs,
void *fs_data)
{
return 0;
so its calculations are in fixed point. Modules can select this
when they require this function. Module will be called cordic.
+config MPILIB
+ tristate "Multiprecision maths library"
+ help
+ Multiprecision maths library from GnuPG.
+ It is used to implement RSA digital signature verification,
+ which is used by IMA/EVM digital signature extension.
+
+config MPILIB_EXTRA
+ bool "Multiprecision maths library - additional sources"
+ depends on MPILIB
+ help
+ Multiprecision maths library from GnuPG.
+ It is used to implement RSA digital signature verification,
+ which is used by IMA/EVM digital signature extension.
+ This code in unnecessary for RSA digital signature verification,
+ and can be compiled if needed.
+
+config DIGSIG
+ tristate "In-kernel signature checker"
+ depends on KEYS
+ select MPILIB
+ help
+ Digital signature verification. Currently only RSA is supported.
+ Implementation is done using GnuPG MPI library
+
endmenu
obj-$(CONFIG_CORDIC) += cordic.o
+obj-$(CONFIG_MPILIB) += mpi/
+obj-$(CONFIG_DIGSIG) += digsig.o
+
hostprogs-y := gen_crc32table
clean-files := crc32table.h
--- /dev/null
+/*
+ * Copyright (C) 2011 Nokia Corporation
+ * Copyright (C) 2011 Intel Corporation
+ *
+ * Author:
+ * Dmitry Kasatkin <dmitry.kasatkin@nokia.com>
+ * <dmitry.kasatkin@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ *
+ * File: sign.c
+ * implements signature (RSA) verification
+ * pkcs decoding is based on LibTomCrypt code
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/key.h>
+#include <linux/crypto.h>
+#include <crypto/hash.h>
+#include <crypto/sha.h>
+#include <keys/user-type.h>
+#include <linux/mpi.h>
+#include <linux/digsig.h>
+
+static struct crypto_shash *shash;
+
+static int pkcs_1_v1_5_decode_emsa(const unsigned char *msg,
+ unsigned long msglen,
+ unsigned long modulus_bitlen,
+ unsigned char *out,
+ unsigned long *outlen,
+ int *is_valid)
+{
+ unsigned long modulus_len, ps_len, i;
+ int result;
+
+ /* default to invalid packet */
+ *is_valid = 0;
+
+ modulus_len = (modulus_bitlen >> 3) + (modulus_bitlen & 7 ? 1 : 0);
+
+ /* test message size */
+ if ((msglen > modulus_len) || (modulus_len < 11))
+ return -EINVAL;
+
+ /* separate encoded message */
+ if ((msg[0] != 0x00) || (msg[1] != (unsigned char)1)) {
+ result = -EINVAL;
+ goto bail;
+ }
+
+ for (i = 2; i < modulus_len - 1; i++)
+ if (msg[i] != 0xFF)
+ break;
+
+ /* separator check */
+ if (msg[i] != 0) {
+ /* There was no octet with hexadecimal value 0x00
+ to separate ps from m. */
+ result = -EINVAL;
+ goto bail;
+ }
+
+ ps_len = i - 2;
+
+ if (*outlen < (msglen - (2 + ps_len + 1))) {
+ *outlen = msglen - (2 + ps_len + 1);
+ result = -EOVERFLOW;
+ goto bail;
+ }
+
+ *outlen = (msglen - (2 + ps_len + 1));
+ memcpy(out, &msg[2 + ps_len + 1], *outlen);
+
+ /* valid packet */
+ *is_valid = 1;
+ result = 0;
+bail:
+ return result;
+}
+
+/*
+ * RSA Signature verification with public key
+ */
+static int digsig_verify_rsa(struct key *key,
+ const char *sig, int siglen,
+ const char *h, int hlen)
+{
+ int err = -EINVAL;
+ unsigned long len;
+ unsigned long mlen, mblen;
+ unsigned nret, l;
+ int valid, head, i;
+ unsigned char *out1 = NULL, *out2 = NULL;
+ MPI in = NULL, res = NULL, pkey[2];
+ uint8_t *p, *datap, *endp;
+ struct user_key_payload *ukp;
+ struct pubkey_hdr *pkh;
+
+ down_read(&key->sem);
+ ukp = key->payload.data;
+ pkh = (struct pubkey_hdr *)ukp->data;
+
+ if (pkh->version != 1)
+ goto err1;
+
+ if (pkh->algo != PUBKEY_ALGO_RSA)
+ goto err1;
+
+ if (pkh->nmpi != 2)
+ goto err1;
+
+ datap = pkh->mpi;
+ endp = datap + ukp->datalen;
+
+ for (i = 0; i < pkh->nmpi; i++) {
+ unsigned int remaining = endp - datap;
+ pkey[i] = mpi_read_from_buffer(datap, &remaining);
+ datap += remaining;
+ }
+
+ mblen = mpi_get_nbits(pkey[0]);
+ mlen = (mblen + 7)/8;
+
+ err = -ENOMEM;
+
+ out1 = kzalloc(mlen, GFP_KERNEL);
+ if (!out1)
+ goto err;
+
+ out2 = kzalloc(mlen, GFP_KERNEL);
+ if (!out2)
+ goto err;
+
+ nret = siglen;
+ in = mpi_read_from_buffer(sig, &nret);
+ if (!in)
+ goto err;
+
+ res = mpi_alloc(mpi_get_nlimbs(in) * 2);
+ if (!res)
+ goto err;
+
+ err = mpi_powm(res, in, pkey[1], pkey[0]);
+ if (err)
+ goto err;
+
+ if (mpi_get_nlimbs(res) * BYTES_PER_MPI_LIMB > mlen) {
+ err = -EINVAL;
+ goto err;
+ }
+
+ p = mpi_get_buffer(res, &l, NULL);
+ if (!p) {
+ err = -EINVAL;
+ goto err;
+ }
+
+ len = mlen;
+ head = len - l;
+ memset(out1, 0, head);
+ memcpy(out1 + head, p, l);
+
+ err = -EINVAL;
+ pkcs_1_v1_5_decode_emsa(out1, len, mblen, out2, &len, &valid);
+
+ if (valid && len == hlen)
+ err = memcmp(out2, h, hlen);
+
+err:
+ mpi_free(in);
+ mpi_free(res);
+ kfree(out1);
+ kfree(out2);
+ mpi_free(pkey[0]);
+ mpi_free(pkey[1]);
+err1:
+ up_read(&key->sem);
+
+ return err;
+}
+
+/**
+ * digsig_verify() - digital signature verification with public key
+ * @keyring: keyring to search key in
+ * @sig: digital signature
+ * @sigen: length of the signature
+ * @data: data
+ * @datalen: length of the data
+ * @return: 0 on success, -EINVAL otherwise
+ *
+ * Verifies data integrity against digital signature.
+ * Currently only RSA is supported.
+ * Normally hash of the content is used as a data for this function.
+ *
+ */
+int digsig_verify(struct key *keyring, const char *sig, int siglen,
+ const char *data, int datalen)
+{
+ int err = -ENOMEM;
+ struct signature_hdr *sh = (struct signature_hdr *)sig;
+ struct shash_desc *desc = NULL;
+ unsigned char hash[SHA1_DIGEST_SIZE];
+ struct key *key;
+ char name[20];
+
+ if (siglen < sizeof(*sh) + 2)
+ return -EINVAL;
+
+ if (sh->algo != PUBKEY_ALGO_RSA)
+ return -ENOTSUPP;
+
+ sprintf(name, "%llX", __be64_to_cpup((uint64_t *)sh->keyid));
+
+ if (keyring) {
+ /* search in specific keyring */
+ key_ref_t kref;
+ kref = keyring_search(make_key_ref(keyring, 1UL),
+ &key_type_user, name);
+ if (IS_ERR(kref))
+ key = ERR_PTR(PTR_ERR(kref));
+ else
+ key = key_ref_to_ptr(kref);
+ } else {
+ key = request_key(&key_type_user, name, NULL);
+ }
+ if (IS_ERR(key)) {
+ pr_err("key not found, id: %s\n", name);
+ return PTR_ERR(key);
+ }
+
+ desc = kzalloc(sizeof(*desc) + crypto_shash_descsize(shash),
+ GFP_KERNEL);
+ if (!desc)
+ goto err;
+
+ desc->tfm = shash;
+ desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
+
+ crypto_shash_init(desc);
+ crypto_shash_update(desc, data, datalen);
+ crypto_shash_update(desc, sig, sizeof(*sh));
+ crypto_shash_final(desc, hash);
+
+ kfree(desc);
+
+ /* pass signature mpis address */
+ err = digsig_verify_rsa(key, sig + sizeof(*sh), siglen - sizeof(*sh),
+ hash, sizeof(hash));
+
+err:
+ key_put(key);
+
+ return err ? -EINVAL : 0;
+}
+EXPORT_SYMBOL_GPL(digsig_verify);
+
+static int __init digsig_init(void)
+{
+ shash = crypto_alloc_shash("sha1", 0, 0);
+ if (IS_ERR(shash)) {
+ pr_err("shash allocation failed\n");
+ return PTR_ERR(shash);
+ }
+
+ return 0;
+
+}
+
+static void __exit digsig_cleanup(void)
+{
+ crypto_free_shash(shash);
+}
+
+module_init(digsig_init);
+module_exit(digsig_cleanup);
+
+MODULE_LICENSE("GPL");
--- /dev/null
+#
+# MPI multiprecision maths library (from gpg)
+#
+
+obj-$(CONFIG_MPILIB) = mpi.o
+
+mpi-y = \
+ generic_mpih-lshift.o \
+ generic_mpih-mul1.o \
+ generic_mpih-mul2.o \
+ generic_mpih-mul3.o \
+ generic_mpih-rshift.o \
+ generic_mpih-sub1.o \
+ generic_mpih-add1.o \
+ mpicoder.o \
+ mpi-bit.o \
+ mpih-cmp.o \
+ mpih-div.o \
+ mpih-mul.o \
+ mpi-pow.o \
+ mpiutil.o
+
+mpi-$(CONFIG_MPILIB_EXTRA) += \
+ mpi-add.o \
+ mpi-div.o \
+ mpi-cmp.o \
+ mpi-gcd.o \
+ mpi-inline.o \
+ mpi-inv.o \
+ mpi-mpow.o \
+ mpi-mul.o \
+ mpi-scan.o
--- /dev/null
+/* This file defines some basic constants for the MPI machinery. We
+ * need to define the types on a per-CPU basis, so it is done with
+ * this file here. */
+#define BYTES_PER_MPI_LIMB (SIZEOF_UNSIGNED_LONG)
--- /dev/null
+/* mpihelp-add_1.c - MPI helper functions
+ * Copyright (C) 1994, 1996, 1997, 1998,
+ * 2000 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ *
+ * Note: This code is heavily based on the GNU MP Library.
+ * Actually it's the same code with only minor changes in the
+ * way the data is stored; this is to support the abstraction
+ * of an optional secure memory allocation which may be used
+ * to avoid revealing of sensitive data due to paging etc.
+ * The GNU MP Library itself is published under the LGPL;
+ * however I decided to publish this code under the plain GPL.
+ */
+
+#include "mpi-internal.h"
+#include "longlong.h"
+
+mpi_limb_t
+mpihelp_add_n(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
+ mpi_ptr_t s2_ptr, mpi_size_t size)
+{
+ mpi_limb_t x, y, cy;
+ mpi_size_t j;
+
+ /* The loop counter and index J goes from -SIZE to -1. This way
+ the loop becomes faster. */
+ j = -size;
+
+ /* Offset the base pointers to compensate for the negative indices. */
+ s1_ptr -= j;
+ s2_ptr -= j;
+ res_ptr -= j;
+
+ cy = 0;
+ do {
+ y = s2_ptr[j];
+ x = s1_ptr[j];
+ y += cy; /* add previous carry to one addend */
+ cy = y < cy; /* get out carry from that addition */
+ y += x; /* add other addend */
+ cy += y < x; /* get out carry from that add, combine */
+ res_ptr[j] = y;
+ } while (++j);
+
+ return cy;
+}
--- /dev/null
+/* mpihelp-lshift.c - MPI helper functions
+ * Copyright (C) 1994, 1996, 1998, 2001 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ *
+ * Note: This code is heavily based on the GNU MP Library.
+ * Actually it's the same code with only minor changes in the
+ * way the data is stored; this is to support the abstraction
+ * of an optional secure memory allocation which may be used
+ * to avoid revealing of sensitive data due to paging etc.
+ * The GNU MP Library itself is published under the LGPL;
+ * however I decided to publish this code under the plain GPL.
+ */
+
+#include "mpi-internal.h"
+
+/* Shift U (pointed to by UP and USIZE digits long) CNT bits to the left
+ * and store the USIZE least significant digits of the result at WP.
+ * Return the bits shifted out from the most significant digit.
+ *
+ * Argument constraints:
+ * 1. 0 < CNT < BITS_PER_MP_LIMB
+ * 2. If the result is to be written over the input, WP must be >= UP.
+ */
+
+mpi_limb_t
+mpihelp_lshift(mpi_ptr_t wp, mpi_ptr_t up, mpi_size_t usize, unsigned int cnt)
+{
+ mpi_limb_t high_limb, low_limb;
+ unsigned sh_1, sh_2;
+ mpi_size_t i;
+ mpi_limb_t retval;
+
+ sh_1 = cnt;
+ wp += 1;
+ sh_2 = BITS_PER_MPI_LIMB - sh_1;
+ i = usize - 1;
+ low_limb = up[i];
+ retval = low_limb >> sh_2;
+ high_limb = low_limb;
+ while (--i >= 0) {
+ low_limb = up[i];
+ wp[i] = (high_limb << sh_1) | (low_limb >> sh_2);
+ high_limb = low_limb;
+ }
+ wp[i] = high_limb << sh_1;
+
+ return retval;
+}
--- /dev/null
+/* mpihelp-mul_1.c - MPI helper functions
+ * Copyright (C) 1994, 1996, 1997, 1998, 2001 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ *
+ * Note: This code is heavily based on the GNU MP Library.
+ * Actually it's the same code with only minor changes in the
+ * way the data is stored; this is to support the abstraction
+ * of an optional secure memory allocation which may be used
+ * to avoid revealing of sensitive data due to paging etc.
+ * The GNU MP Library itself is published under the LGPL;
+ * however I decided to publish this code under the plain GPL.
+ */
+
+#include "mpi-internal.h"
+#include "longlong.h"
+
+mpi_limb_t
+mpihelp_mul_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, mpi_size_t s1_size,
+ mpi_limb_t s2_limb)
+{
+ mpi_limb_t cy_limb;
+ mpi_size_t j;
+ mpi_limb_t prod_high, prod_low;
+
+ /* The loop counter and index J goes from -S1_SIZE to -1. This way
+ * the loop becomes faster. */
+ j = -s1_size;
+
+ /* Offset the base pointers to compensate for the negative indices. */
+ s1_ptr -= j;
+ res_ptr -= j;
+
+ cy_limb = 0;
+ do {
+ umul_ppmm(prod_high, prod_low, s1_ptr[j], s2_limb);
+ prod_low += cy_limb;
+ cy_limb = (prod_low < cy_limb ? 1 : 0) + prod_high;
+ res_ptr[j] = prod_low;
+ } while (++j);
+
+ return cy_limb;
+}
--- /dev/null
+/* mpihelp-mul_2.c - MPI helper functions
+ * Copyright (C) 1994, 1996, 1997, 1998, 2001 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ *
+ * Note: This code is heavily based on the GNU MP Library.
+ * Actually it's the same code with only minor changes in the
+ * way the data is stored; this is to support the abstraction
+ * of an optional secure memory allocation which may be used
+ * to avoid revealing of sensitive data due to paging etc.
+ * The GNU MP Library itself is published under the LGPL;
+ * however I decided to publish this code under the plain GPL.
+ */
+
+#include "mpi-internal.h"
+#include "longlong.h"
+
+mpi_limb_t
+mpihelp_addmul_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
+ mpi_size_t s1_size, mpi_limb_t s2_limb)
+{
+ mpi_limb_t cy_limb;
+ mpi_size_t j;
+ mpi_limb_t prod_high, prod_low;
+ mpi_limb_t x;
+
+ /* The loop counter and index J goes from -SIZE to -1. This way
+ * the loop becomes faster. */
+ j = -s1_size;
+ res_ptr -= j;
+ s1_ptr -= j;
+
+ cy_limb = 0;
+ do {
+ umul_ppmm(prod_high, prod_low, s1_ptr[j], s2_limb);
+
+ prod_low += cy_limb;
+ cy_limb = (prod_low < cy_limb ? 1 : 0) + prod_high;
+
+ x = res_ptr[j];
+ prod_low = x + prod_low;
+ cy_limb += prod_low < x ? 1 : 0;
+ res_ptr[j] = prod_low;
+ } while (++j);
+ return cy_limb;
+}
--- /dev/null
+/* mpihelp-mul_3.c - MPI helper functions
+ * Copyright (C) 1994, 1996, 1997, 1998, 2001 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ *
+ * Note: This code is heavily based on the GNU MP Library.
+ * Actually it's the same code with only minor changes in the
+ * way the data is stored; this is to support the abstraction
+ * of an optional secure memory allocation which may be used
+ * to avoid revealing of sensitive data due to paging etc.
+ * The GNU MP Library itself is published under the LGPL;
+ * however I decided to publish this code under the plain GPL.
+ */
+
+#include "mpi-internal.h"
+#include "longlong.h"
+
+mpi_limb_t
+mpihelp_submul_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
+ mpi_size_t s1_size, mpi_limb_t s2_limb)
+{
+ mpi_limb_t cy_limb;
+ mpi_size_t j;
+ mpi_limb_t prod_high, prod_low;
+ mpi_limb_t x;
+
+ /* The loop counter and index J goes from -SIZE to -1. This way
+ * the loop becomes faster. */
+ j = -s1_size;
+ res_ptr -= j;
+ s1_ptr -= j;
+
+ cy_limb = 0;
+ do {
+ umul_ppmm(prod_high, prod_low, s1_ptr[j], s2_limb);
+
+ prod_low += cy_limb;
+ cy_limb = (prod_low < cy_limb ? 1 : 0) + prod_high;
+
+ x = res_ptr[j];
+ prod_low = x - prod_low;
+ cy_limb += prod_low > x ? 1 : 0;
+ res_ptr[j] = prod_low;
+ } while (++j);
+
+ return cy_limb;
+}
--- /dev/null
+/* mpih-rshift.c - MPI helper functions
+ * Copyright (C) 1994, 1996, 1998, 1999,
+ * 2000, 2001 Free Software Foundation, Inc.
+ *
+ * This file is part of GNUPG
+ *
+ * GNUPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GNUPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ *
+ * Note: This code is heavily based on the GNU MP Library.
+ * Actually it's the same code with only minor changes in the
+ * way the data is stored; this is to support the abstraction
+ * of an optional secure memory allocation which may be used
+ * to avoid revealing of sensitive data due to paging etc.
+ * The GNU MP Library itself is published under the LGPL;
+ * however I decided to publish this code under the plain GPL.
+ */
+
+#include "mpi-internal.h"
+
+/* Shift U (pointed to by UP and USIZE limbs long) CNT bits to the right
+ * and store the USIZE least significant limbs of the result at WP.
+ * The bits shifted out to the right are returned.
+ *
+ * Argument constraints:
+ * 1. 0 < CNT < BITS_PER_MP_LIMB
+ * 2. If the result is to be written over the input, WP must be <= UP.
+ */
+
+mpi_limb_t
+mpihelp_rshift(mpi_ptr_t wp, mpi_ptr_t up, mpi_size_t usize, unsigned cnt)
+{
+ mpi_limb_t high_limb, low_limb;
+ unsigned sh_1, sh_2;
+ mpi_size_t i;
+ mpi_limb_t retval;
+
+ sh_1 = cnt;
+ wp -= 1;
+ sh_2 = BITS_PER_MPI_LIMB - sh_1;
+ high_limb = up[0];
+ retval = high_limb << sh_2;
+ low_limb = high_limb;
+ for (i = 1; i < usize; i++) {
+ high_limb = up[i];
+ wp[i] = (low_limb >> sh_1) | (high_limb << sh_2);
+ low_limb = high_limb;
+ }
+ wp[i] = low_limb >> sh_1;
+
+ return retval;
+}
--- /dev/null
+/* mpihelp-add_2.c - MPI helper functions
+ * Copyright (C) 1994, 1996, 1997, 1998, 2001 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ *
+ * Note: This code is heavily based on the GNU MP Library.
+ * Actually it's the same code with only minor changes in the
+ * way the data is stored; this is to support the abstraction
+ * of an optional secure memory allocation which may be used
+ * to avoid revealing of sensitive data due to paging etc.
+ * The GNU MP Library itself is published under the LGPL;
+ * however I decided to publish this code under the plain GPL.
+ */
+
+#include "mpi-internal.h"
+#include "longlong.h"
+
+mpi_limb_t
+mpihelp_sub_n(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
+ mpi_ptr_t s2_ptr, mpi_size_t size)
+{
+ mpi_limb_t x, y, cy;
+ mpi_size_t j;
+
+ /* The loop counter and index J goes from -SIZE to -1. This way
+ the loop becomes faster. */
+ j = -size;
+
+ /* Offset the base pointers to compensate for the negative indices. */
+ s1_ptr -= j;
+ s2_ptr -= j;
+ res_ptr -= j;
+
+ cy = 0;
+ do {
+ y = s2_ptr[j];
+ x = s1_ptr[j];
+ y += cy; /* add previous carry to subtrahend */
+ cy = y < cy; /* get out carry from that addition */
+ y = x - y; /* main subtract */
+ cy += y > x; /* get out carry from the subtract, combine */
+ res_ptr[j] = y;
+ } while (++j);
+
+ return cy;
+}
--- /dev/null
+/* longlong.h -- definitions for mixed size 32/64 bit arithmetic.
+ * Note: I added some stuff for use with gnupg
+ *
+ * Copyright (C) 1991, 1992, 1993, 1994, 1996, 1998,
+ * 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This file is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this file; see the file COPYING.LIB. If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA. */
+
+/* You have to define the following before including this file:
+ *
+ * UWtype -- An unsigned type, default type for operations (typically a "word")
+ * UHWtype -- An unsigned type, at least half the size of UWtype.
+ * UDWtype -- An unsigned type, at least twice as large a UWtype
+ * W_TYPE_SIZE -- size in bits of UWtype
+ *
+ * SItype, USItype -- Signed and unsigned 32 bit types.
+ * DItype, UDItype -- Signed and unsigned 64 bit types.
+ *
+ * On a 32 bit machine UWtype should typically be USItype;
+ * on a 64 bit machine, UWtype should typically be UDItype.
+*/
+
+#define __BITS4 (W_TYPE_SIZE / 4)
+#define __ll_B ((UWtype) 1 << (W_TYPE_SIZE / 2))
+#define __ll_lowpart(t) ((UWtype) (t) & (__ll_B - 1))
+#define __ll_highpart(t) ((UWtype) (t) >> (W_TYPE_SIZE / 2))
+
+/* This is used to make sure no undesirable sharing between different libraries
+ that use this file takes place. */
+#ifndef __MPN
+#define __MPN(x) __##x
+#endif
+
+/* Define auxiliary asm macros.
+ *
+ * 1) umul_ppmm(high_prod, low_prod, multipler, multiplicand) multiplies two
+ * UWtype integers MULTIPLER and MULTIPLICAND, and generates a two UWtype
+ * word product in HIGH_PROD and LOW_PROD.
+ *
+ * 2) __umulsidi3(a,b) multiplies two UWtype integers A and B, and returns a
+ * UDWtype product. This is just a variant of umul_ppmm.
+
+ * 3) udiv_qrnnd(quotient, remainder, high_numerator, low_numerator,
+ * denominator) divides a UDWtype, composed by the UWtype integers
+ * HIGH_NUMERATOR and LOW_NUMERATOR, by DENOMINATOR and places the quotient
+ * in QUOTIENT and the remainder in REMAINDER. HIGH_NUMERATOR must be less
+ * than DENOMINATOR for correct operation. If, in addition, the most
+ * significant bit of DENOMINATOR must be 1, then the pre-processor symbol
+ * UDIV_NEEDS_NORMALIZATION is defined to 1.
+ * 4) sdiv_qrnnd(quotient, remainder, high_numerator, low_numerator,
+ * denominator). Like udiv_qrnnd but the numbers are signed. The quotient
+ * is rounded towards 0.
+ *
+ * 5) count_leading_zeros(count, x) counts the number of zero-bits from the
+ * msb to the first non-zero bit in the UWtype X. This is the number of
+ * steps X needs to be shifted left to set the msb. Undefined for X == 0,
+ * unless the symbol COUNT_LEADING_ZEROS_0 is defined to some value.
+ *
+ * 6) count_trailing_zeros(count, x) like count_leading_zeros, but counts
+ * from the least significant end.
+ *
+ * 7) add_ssaaaa(high_sum, low_sum, high_addend_1, low_addend_1,
+ * high_addend_2, low_addend_2) adds two UWtype integers, composed by
+ * HIGH_ADDEND_1 and LOW_ADDEND_1, and HIGH_ADDEND_2 and LOW_ADDEND_2
+ * respectively. The result is placed in HIGH_SUM and LOW_SUM. Overflow
+ * (i.e. carry out) is not stored anywhere, and is lost.
+ *
+ * 8) sub_ddmmss(high_difference, low_difference, high_minuend, low_minuend,
+ * high_subtrahend, low_subtrahend) subtracts two two-word UWtype integers,
+ * composed by HIGH_MINUEND_1 and LOW_MINUEND_1, and HIGH_SUBTRAHEND_2 and
+ * LOW_SUBTRAHEND_2 respectively. The result is placed in HIGH_DIFFERENCE
+ * and LOW_DIFFERENCE. Overflow (i.e. carry out) is not stored anywhere,
+ * and is lost.
+ *
+ * If any of these macros are left undefined for a particular CPU,
+ * C macros are used. */
+
+/* The CPUs come in alphabetical order below.
+ *
+ * Please add support for more CPUs here, or improve the current support
+ * for the CPUs below! */
+
+#if defined(__GNUC__) && !defined(NO_ASM)
+
+/* We sometimes need to clobber "cc" with gcc2, but that would not be
+ understood by gcc1. Use cpp to avoid major code duplication. */
+#if __GNUC__ < 2
+#define __CLOBBER_CC
+#define __AND_CLOBBER_CC
+#else /* __GNUC__ >= 2 */
+#define __CLOBBER_CC : "cc"
+#define __AND_CLOBBER_CC , "cc"
+#endif /* __GNUC__ < 2 */
+
+/***************************************
+ ************** A29K *****************
+ ***************************************/
+#if (defined(__a29k__) || defined(_AM29K)) && W_TYPE_SIZE == 32
+#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
+ __asm__ ("add %1,%4,%5\n" \
+ "addc %0,%2,%3" \
+ : "=r" ((USItype)(sh)), \
+ "=&r" ((USItype)(sl)) \
+ : "%r" ((USItype)(ah)), \
+ "rI" ((USItype)(bh)), \
+ "%r" ((USItype)(al)), \
+ "rI" ((USItype)(bl)))
+#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
+ __asm__ ("sub %1,%4,%5\n" \
+ "subc %0,%2,%3" \
+ : "=r" ((USItype)(sh)), \
+ "=&r" ((USItype)(sl)) \
+ : "r" ((USItype)(ah)), \
+ "rI" ((USItype)(bh)), \
+ "r" ((USItype)(al)), \
+ "rI" ((USItype)(bl)))
+#define umul_ppmm(xh, xl, m0, m1) \
+do { \
+ USItype __m0 = (m0), __m1 = (m1); \
+ __asm__ ("multiplu %0,%1,%2" \
+ : "=r" ((USItype)(xl)) \
+ : "r" (__m0), \
+ "r" (__m1)); \
+ __asm__ ("multmu %0,%1,%2" \
+ : "=r" ((USItype)(xh)) \
+ : "r" (__m0), \
+ "r" (__m1)); \
+} while (0)
+#define udiv_qrnnd(q, r, n1, n0, d) \
+ __asm__ ("dividu %0,%3,%4" \
+ : "=r" ((USItype)(q)), \
+ "=q" ((USItype)(r)) \
+ : "1" ((USItype)(n1)), \
+ "r" ((USItype)(n0)), \
+ "r" ((USItype)(d)))
+
+#define count_leading_zeros(count, x) \
+ __asm__ ("clz %0,%1" \
+ : "=r" ((USItype)(count)) \
+ : "r" ((USItype)(x)))
+#define COUNT_LEADING_ZEROS_0 32
+#endif /* __a29k__ */
+
+#if defined(__alpha) && W_TYPE_SIZE == 64
+#define umul_ppmm(ph, pl, m0, m1) \
+do { \
+ UDItype __m0 = (m0), __m1 = (m1); \
+ __asm__ ("umulh %r1,%2,%0" \
+ : "=r" ((UDItype) ph) \
+ : "%rJ" (__m0), \
+ "rI" (__m1)); \
+ (pl) = __m0 * __m1; \
+ } while (0)
+#define UMUL_TIME 46
+#ifndef LONGLONG_STANDALONE
+#define udiv_qrnnd(q, r, n1, n0, d) \
+do { UDItype __r; \
+ (q) = __udiv_qrnnd(&__r, (n1), (n0), (d)); \
+ (r) = __r; \
+} while (0)
+extern UDItype __udiv_qrnnd();
+#define UDIV_TIME 220
+#endif /* LONGLONG_STANDALONE */
+#endif /* __alpha */
+
+/***************************************
+ ************** ARM ******************
+ ***************************************/
+#if defined(__arm__) && W_TYPE_SIZE == 32
+#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
+ __asm__ ("adds %1, %4, %5\n" \
+ "adc %0, %2, %3" \
+ : "=r" ((USItype)(sh)), \
+ "=&r" ((USItype)(sl)) \
+ : "%r" ((USItype)(ah)), \
+ "rI" ((USItype)(bh)), \
+ "%r" ((USItype)(al)), \
+ "rI" ((USItype)(bl)))
+#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
+ __asm__ ("subs %1, %4, %5\n" \
+ "sbc %0, %2, %3" \
+ : "=r" ((USItype)(sh)), \
+ "=&r" ((USItype)(sl)) \
+ : "r" ((USItype)(ah)), \
+ "rI" ((USItype)(bh)), \
+ "r" ((USItype)(al)), \
+ "rI" ((USItype)(bl)))
+#if defined __ARM_ARCH_2__ || defined __ARM_ARCH_3__
+#define umul_ppmm(xh, xl, a, b) \
+ __asm__ ("%@ Inlined umul_ppmm\n" \
+ "mov %|r0, %2, lsr #16 @ AAAA\n" \
+ "mov %|r2, %3, lsr #16 @ BBBB\n" \
+ "bic %|r1, %2, %|r0, lsl #16 @ aaaa\n" \
+ "bic %0, %3, %|r2, lsl #16 @ bbbb\n" \
+ "mul %1, %|r1, %|r2 @ aaaa * BBBB\n" \
+ "mul %|r2, %|r0, %|r2 @ AAAA * BBBB\n" \
+ "mul %|r1, %0, %|r1 @ aaaa * bbbb\n" \
+ "mul %0, %|r0, %0 @ AAAA * bbbb\n" \
+ "adds %|r0, %1, %0 @ central sum\n" \
+ "addcs %|r2, %|r2, #65536\n" \
+ "adds %1, %|r1, %|r0, lsl #16\n" \
+ "adc %0, %|r2, %|r0, lsr #16" \
+ : "=&r" ((USItype)(xh)), \
+ "=r" ((USItype)(xl)) \
+ : "r" ((USItype)(a)), \
+ "r" ((USItype)(b)) \
+ : "r0", "r1", "r2")
+#else
+#define umul_ppmm(xh, xl, a, b) \
+ __asm__ ("%@ Inlined umul_ppmm\n" \
+ "umull %r1, %r0, %r2, %r3" \
+ : "=&r" ((USItype)(xh)), \
+ "=r" ((USItype)(xl)) \
+ : "r" ((USItype)(a)), \
+ "r" ((USItype)(b)) \
+ : "r0", "r1")
+#endif
+#define UMUL_TIME 20
+#define UDIV_TIME 100
+#endif /* __arm__ */
+
+/***************************************
+ ************** CLIPPER **************
+ ***************************************/
+#if defined(__clipper__) && W_TYPE_SIZE == 32
+#define umul_ppmm(w1, w0, u, v) \
+ ({union {UDItype __ll; \
+ struct {USItype __l, __h; } __i; \
+ } __xx; \
+ __asm__ ("mulwux %2,%0" \
+ : "=r" (__xx.__ll) \
+ : "%0" ((USItype)(u)), \
+ "r" ((USItype)(v))); \
+ (w1) = __xx.__i.__h; (w0) = __xx.__i.__l; })
+#define smul_ppmm(w1, w0, u, v) \
+ ({union {DItype __ll; \
+ struct {SItype __l, __h; } __i; \
+ } __xx; \
+ __asm__ ("mulwx %2,%0" \
+ : "=r" (__xx.__ll) \
+ : "%0" ((SItype)(u)), \
+ "r" ((SItype)(v))); \
+ (w1) = __xx.__i.__h; (w0) = __xx.__i.__l; })
+#define __umulsidi3(u, v) \
+ ({UDItype __w; \
+ __asm__ ("mulwux %2,%0" \
+ : "=r" (__w) \
+ : "%0" ((USItype)(u)), \
+ "r" ((USItype)(v))); \
+ __w; })
+#endif /* __clipper__ */
+
+/***************************************
+ ************** GMICRO ***************
+ ***************************************/
+#if defined(__gmicro__) && W_TYPE_SIZE == 32
+#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
+ __asm__ ("add.w %5,%1\n" \
+ "addx %3,%0" \
+ : "=g" ((USItype)(sh)), \
+ "=&g" ((USItype)(sl)) \
+ : "%0" ((USItype)(ah)), \
+ "g" ((USItype)(bh)), \
+ "%1" ((USItype)(al)), \
+ "g" ((USItype)(bl)))
+#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
+ __asm__ ("sub.w %5,%1\n" \
+ "subx %3,%0" \
+ : "=g" ((USItype)(sh)), \
+ "=&g" ((USItype)(sl)) \
+ : "0" ((USItype)(ah)), \
+ "g" ((USItype)(bh)), \
+ "1" ((USItype)(al)), \
+ "g" ((USItype)(bl)))
+#define umul_ppmm(ph, pl, m0, m1) \
+ __asm__ ("mulx %3,%0,%1" \
+ : "=g" ((USItype)(ph)), \
+ "=r" ((USItype)(pl)) \
+ : "%0" ((USItype)(m0)), \
+ "g" ((USItype)(m1)))
+#define udiv_qrnnd(q, r, nh, nl, d) \
+ __asm__ ("divx %4,%0,%1" \
+ : "=g" ((USItype)(q)), \
+ "=r" ((USItype)(r)) \
+ : "1" ((USItype)(nh)), \
+ "0" ((USItype)(nl)), \
+ "g" ((USItype)(d)))
+#define count_leading_zeros(count, x) \
+ __asm__ ("bsch/1 %1,%0" \
+ : "=g" (count) \
+ : "g" ((USItype)(x)), \
+ "0" ((USItype)0))
+#endif
+
+/***************************************
+ ************** HPPA *****************
+ ***************************************/
+#if defined(__hppa) && W_TYPE_SIZE == 32
+#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
+ __asm__ ("add %4,%5,%1\n" \
+ "addc %2,%3,%0" \
+ : "=r" ((USItype)(sh)), \
+ "=&r" ((USItype)(sl)) \
+ : "%rM" ((USItype)(ah)), \
+ "rM" ((USItype)(bh)), \
+ "%rM" ((USItype)(al)), \
+ "rM" ((USItype)(bl)))
+#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
+ __asm__ ("sub %4,%5,%1\n" \
+ "subb %2,%3,%0" \
+ : "=r" ((USItype)(sh)), \
+ "=&r" ((USItype)(sl)) \
+ : "rM" ((USItype)(ah)), \
+ "rM" ((USItype)(bh)), \
+ "rM" ((USItype)(al)), \
+ "rM" ((USItype)(bl)))
+#if defined(_PA_RISC1_1)
+#define umul_ppmm(wh, wl, u, v) \
+do { \
+ union {UDItype __ll; \
+ struct {USItype __h, __l; } __i; \
+ } __xx; \
+ __asm__ ("xmpyu %1,%2,%0" \
+ : "=*f" (__xx.__ll) \
+ : "*f" ((USItype)(u)), \
+ "*f" ((USItype)(v))); \
+ (wh) = __xx.__i.__h; \
+ (wl) = __xx.__i.__l; \
+} while (0)
+#define UMUL_TIME 8
+#define UDIV_TIME 60
+#else
+#define UMUL_TIME 40
+#define UDIV_TIME 80
+#endif
+#ifndef LONGLONG_STANDALONE
+#define udiv_qrnnd(q, r, n1, n0, d) \
+do { USItype __r; \
+ (q) = __udiv_qrnnd(&__r, (n1), (n0), (d)); \
+ (r) = __r; \
+} while (0)
+extern USItype __udiv_qrnnd();
+#endif /* LONGLONG_STANDALONE */
+#define count_leading_zeros(count, x) \
+do { \
+ USItype __tmp; \
+ __asm__ ( \
+ "ldi 1,%0\n" \
+ "extru,= %1,15,16,%%r0 ; Bits 31..16 zero?\n" \
+ "extru,tr %1,15,16,%1 ; No. Shift down, skip add.\n" \
+ "ldo 16(%0),%0 ; Yes. Perform add.\n" \
+ "extru,= %1,23,8,%%r0 ; Bits 15..8 zero?\n" \
+ "extru,tr %1,23,8,%1 ; No. Shift down, skip add.\n" \
+ "ldo 8(%0),%0 ; Yes. Perform add.\n" \
+ "extru,= %1,27,4,%%r0 ; Bits 7..4 zero?\n" \
+ "extru,tr %1,27,4,%1 ; No. Shift down, skip add.\n" \
+ "ldo 4(%0),%0 ; Yes. Perform add.\n" \
+ "extru,= %1,29,2,%%r0 ; Bits 3..2 zero?\n" \
+ "extru,tr %1,29,2,%1 ; No. Shift down, skip add.\n" \
+ "ldo 2(%0),%0 ; Yes. Perform add.\n" \
+ "extru %1,30,1,%1 ; Extract bit 1.\n" \
+ "sub %0,%1,%0 ; Subtract it. " \
+ : "=r" (count), "=r" (__tmp) : "1" (x)); \
+} while (0)
+#endif /* hppa */
+
+/***************************************
+ ************** I370 *****************
+ ***************************************/
+#if (defined(__i370__) || defined(__mvs__)) && W_TYPE_SIZE == 32
+#define umul_ppmm(xh, xl, m0, m1) \
+do { \
+ union {UDItype __ll; \
+ struct {USItype __h, __l; } __i; \
+ } __xx; \
+ USItype __m0 = (m0), __m1 = (m1); \
+ __asm__ ("mr %0,%3" \
+ : "=r" (__xx.__i.__h), \
+ "=r" (__xx.__i.__l) \
+ : "%1" (__m0), \
+ "r" (__m1)); \
+ (xh) = __xx.__i.__h; (xl) = __xx.__i.__l; \
+ (xh) += ((((SItype) __m0 >> 31) & __m1) \
+ + (((SItype) __m1 >> 31) & __m0)); \
+} while (0)
+#define smul_ppmm(xh, xl, m0, m1) \
+do { \
+ union {DItype __ll; \
+ struct {USItype __h, __l; } __i; \
+ } __xx; \
+ __asm__ ("mr %0,%3" \
+ : "=r" (__xx.__i.__h), \
+ "=r" (__xx.__i.__l) \
+ : "%1" (m0), \
+ "r" (m1)); \
+ (xh) = __xx.__i.__h; (xl) = __xx.__i.__l; \
+} while (0)
+#define sdiv_qrnnd(q, r, n1, n0, d) \
+do { \
+ union {DItype __ll; \
+ struct {USItype __h, __l; } __i; \
+ } __xx; \
+ __xx.__i.__h = n1; __xx.__i.__l = n0; \
+ __asm__ ("dr %0,%2" \
+ : "=r" (__xx.__ll) \
+ : "0" (__xx.__ll), "r" (d)); \
+ (q) = __xx.__i.__l; (r) = __xx.__i.__h; \
+} while (0)
+#endif
+
+/***************************************
+ ************** I386 *****************
+ ***************************************/
+#undef __i386__
+#if (defined(__i386__) || defined(__i486__)) && W_TYPE_SIZE == 32
+#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
+ __asm__ ("addl %5,%1\n" \
+ "adcl %3,%0" \
+ : "=r" ((USItype)(sh)), \
+ "=&r" ((USItype)(sl)) \
+ : "%0" ((USItype)(ah)), \
+ "g" ((USItype)(bh)), \
+ "%1" ((USItype)(al)), \
+ "g" ((USItype)(bl)))
+#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
+ __asm__ ("subl %5,%1\n" \
+ "sbbl %3,%0" \
+ : "=r" ((USItype)(sh)), \
+ "=&r" ((USItype)(sl)) \
+ : "0" ((USItype)(ah)), \
+ "g" ((USItype)(bh)), \
+ "1" ((USItype)(al)), \
+ "g" ((USItype)(bl)))
+#define umul_ppmm(w1, w0, u, v) \
+ __asm__ ("mull %3" \
+ : "=a" ((USItype)(w0)), \
+ "=d" ((USItype)(w1)) \
+ : "%0" ((USItype)(u)), \
+ "rm" ((USItype)(v)))
+#define udiv_qrnnd(q, r, n1, n0, d) \
+ __asm__ ("divl %4" \
+ : "=a" ((USItype)(q)), \
+ "=d" ((USItype)(r)) \
+ : "0" ((USItype)(n0)), \
+ "1" ((USItype)(n1)), \
+ "rm" ((USItype)(d)))
+#define count_leading_zeros(count, x) \
+do { \
+ USItype __cbtmp; \
+ __asm__ ("bsrl %1,%0" \
+ : "=r" (__cbtmp) : "rm" ((USItype)(x))); \
+ (count) = __cbtmp ^ 31; \
+} while (0)
+#define count_trailing_zeros(count, x) \
+ __asm__ ("bsfl %1,%0" : "=r" (count) : "rm" ((USItype)(x)))
+#ifndef UMUL_TIME
+#define UMUL_TIME 40
+#endif
+#ifndef UDIV_TIME
+#define UDIV_TIME 40
+#endif
+#endif /* 80x86 */
+
+/***************************************
+ ************** I860 *****************
+ ***************************************/
+#if defined(__i860__) && W_TYPE_SIZE == 32
+#define rshift_rhlc(r, h, l, c) \
+ __asm__ ("shr %3,r0,r0\n" \
+ "shrd %1,%2,%0" \
+ "=r" (r) : "r" (h), "r" (l), "rn" (c))
+#endif /* i860 */
+
+/***************************************
+ ************** I960 *****************
+ ***************************************/
+#if defined(__i960__) && W_TYPE_SIZE == 32
+#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
+ __asm__ ("cmpo 1,0\n" \
+ "addc %5,%4,%1\n" \
+ "addc %3,%2,%0" \
+ : "=r" ((USItype)(sh)), \
+ "=&r" ((USItype)(sl)) \
+ : "%dI" ((USItype)(ah)), \
+ "dI" ((USItype)(bh)), \
+ "%dI" ((USItype)(al)), \
+ "dI" ((USItype)(bl)))
+#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
+ __asm__ ("cmpo 0,0\n" \
+ "subc %5,%4,%1\n" \
+ "subc %3,%2,%0" \
+ : "=r" ((USItype)(sh)), \
+ "=&r" ((USItype)(sl)) \
+ : "dI" ((USItype)(ah)), \
+ "dI" ((USItype)(bh)), \
+ "dI" ((USItype)(al)), \
+ "dI" ((USItype)(bl)))
+#define umul_ppmm(w1, w0, u, v) \
+ ({union {UDItype __ll; \
+ struct {USItype __l, __h; } __i; \
+ } __xx; \
+ __asm__ ("emul %2,%1,%0" \
+ : "=d" (__xx.__ll) \
+ : "%dI" ((USItype)(u)), \
+ "dI" ((USItype)(v))); \
+ (w1) = __xx.__i.__h; (w0) = __xx.__i.__l; })
+#define __umulsidi3(u, v) \
+ ({UDItype __w; \
+ __asm__ ("emul %2,%1,%0" \
+ : "=d" (__w) \
+ : "%dI" ((USItype)(u)), \
+ "dI" ((USItype)(v))); \
+ __w; })
+#define udiv_qrnnd(q, r, nh, nl, d) \
+do { \
+ union {UDItype __ll; \
+ struct {USItype __l, __h; } __i; \
+ } __nn; \
+ __nn.__i.__h = (nh); __nn.__i.__l = (nl); \
+ __asm__ ("ediv %d,%n,%0" \
+ : "=d" (__rq.__ll) \
+ : "dI" (__nn.__ll), \
+ "dI" ((USItype)(d))); \
+ (r) = __rq.__i.__l; (q) = __rq.__i.__h; \
+} while (0)
+#define count_leading_zeros(count, x) \
+do { \
+ USItype __cbtmp; \
+ __asm__ ("scanbit %1,%0" \
+ : "=r" (__cbtmp) \
+ : "r" ((USItype)(x))); \
+ (count) = __cbtmp ^ 31; \
+} while (0)
+#define COUNT_LEADING_ZEROS_0 (-32) /* sic */
+#if defined(__i960mx) /* what is the proper symbol to test??? */
+#define rshift_rhlc(r, h, l, c) \
+do { \
+ union {UDItype __ll; \
+ struct {USItype __l, __h; } __i; \
+ } __nn; \
+ __nn.__i.__h = (h); __nn.__i.__l = (l); \
+ __asm__ ("shre %2,%1,%0" \
+ : "=d" (r) : "dI" (__nn.__ll), "dI" (c)); \
+}
+#endif /* i960mx */
+#endif /* i960 */
+
+/***************************************
+ ************** 68000 ****************
+ ***************************************/
+#if (defined(__mc68000__) || defined(__mc68020__) || defined(__NeXT__) || defined(mc68020)) && W_TYPE_SIZE == 32
+#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
+ __asm__ ("add%.l %5,%1\n" \
+ "addx%.l %3,%0" \
+ : "=d" ((USItype)(sh)), \
+ "=&d" ((USItype)(sl)) \
+ : "%0" ((USItype)(ah)), \
+ "d" ((USItype)(bh)), \
+ "%1" ((USItype)(al)), \
+ "g" ((USItype)(bl)))
+#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
+ __asm__ ("sub%.l %5,%1\n" \
+ "subx%.l %3,%0" \
+ : "=d" ((USItype)(sh)), \
+ "=&d" ((USItype)(sl)) \
+ : "0" ((USItype)(ah)), \
+ "d" ((USItype)(bh)), \
+ "1" ((USItype)(al)), \
+ "g" ((USItype)(bl)))
+#if (defined(__mc68020__) || defined(__NeXT__) || defined(mc68020))
+#define umul_ppmm(w1, w0, u, v) \
+ __asm__ ("mulu%.l %3,%1:%0" \
+ : "=d" ((USItype)(w0)), \
+ "=d" ((USItype)(w1)) \
+ : "%0" ((USItype)(u)), \
+ "dmi" ((USItype)(v)))
+#define UMUL_TIME 45
+#define udiv_qrnnd(q, r, n1, n0, d) \
+ __asm__ ("divu%.l %4,%1:%0" \
+ : "=d" ((USItype)(q)), \
+ "=d" ((USItype)(r)) \
+ : "0" ((USItype)(n0)), \
+ "1" ((USItype)(n1)), \
+ "dmi" ((USItype)(d)))
+#define UDIV_TIME 90
+#define sdiv_qrnnd(q, r, n1, n0, d) \
+ __asm__ ("divs%.l %4,%1:%0" \
+ : "=d" ((USItype)(q)), \
+ "=d" ((USItype)(r)) \
+ : "0" ((USItype)(n0)), \
+ "1" ((USItype)(n1)), \
+ "dmi" ((USItype)(d)))
+#define count_leading_zeros(count, x) \
+ __asm__ ("bfffo %1{%b2:%b2},%0" \
+ : "=d" ((USItype)(count)) \
+ : "od" ((USItype)(x)), "n" (0))
+#define COUNT_LEADING_ZEROS_0 32
+#else /* not mc68020 */
+#define umul_ppmm(xh, xl, a, b) \
+do { USItype __umul_tmp1, __umul_tmp2; \
+ __asm__ ("| Inlined umul_ppmm\n" \
+ "move%.l %5,%3\n" \
+ "move%.l %2,%0\n" \
+ "move%.w %3,%1\n" \
+ "swap %3\n" \
+ "swap %0\n" \
+ "mulu %2,%1\n" \
+ "mulu %3,%0\n" \
+ "mulu %2,%3\n" \
+ "swap %2\n" \
+ "mulu %5,%2\n" \
+ "add%.l %3,%2\n" \
+ "jcc 1f\n" \
+ "add%.l %#0x10000,%0\n" \
+ "1: move%.l %2,%3\n" \
+ "clr%.w %2\n" \
+ "swap %2\n" \
+ "swap %3\n" \
+ "clr%.w %3\n" \
+ "add%.l %3,%1\n" \
+ "addx%.l %2,%0\n" \
+ "| End inlined umul_ppmm" \
+ : "=&d" ((USItype)(xh)), "=&d" ((USItype)(xl)), \
+ "=d" (__umul_tmp1), "=&d" (__umul_tmp2) \
+ : "%2" ((USItype)(a)), "d" ((USItype)(b))); \
+} while (0)
+#define UMUL_TIME 100
+#define UDIV_TIME 400
+#endif /* not mc68020 */
+#endif /* mc68000 */
+
+/***************************************
+ ************** 88000 ****************
+ ***************************************/
+#if defined(__m88000__) && W_TYPE_SIZE == 32
+#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
+ __asm__ ("addu.co %1,%r4,%r5\n" \
+ "addu.ci %0,%r2,%r3" \
+ : "=r" ((USItype)(sh)), \
+ "=&r" ((USItype)(sl)) \
+ : "%rJ" ((USItype)(ah)), \
+ "rJ" ((USItype)(bh)), \
+ "%rJ" ((USItype)(al)), \
+ "rJ" ((USItype)(bl)))
+#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
+ __asm__ ("subu.co %1,%r4,%r5\n" \
+ "subu.ci %0,%r2,%r3" \
+ : "=r" ((USItype)(sh)), \
+ "=&r" ((USItype)(sl)) \
+ : "rJ" ((USItype)(ah)), \
+ "rJ" ((USItype)(bh)), \
+ "rJ" ((USItype)(al)), \
+ "rJ" ((USItype)(bl)))
+#define count_leading_zeros(count, x) \
+do { \
+ USItype __cbtmp; \
+ __asm__ ("ff1 %0,%1" \
+ : "=r" (__cbtmp) \
+ : "r" ((USItype)(x))); \
+ (count) = __cbtmp ^ 31; \
+} while (0)
+#define COUNT_LEADING_ZEROS_0 63 /* sic */
+#if defined(__m88110__)
+#define umul_ppmm(wh, wl, u, v) \
+do { \
+ union {UDItype __ll; \
+ struct {USItype __h, __l; } __i; \
+ } __x; \
+ __asm__ ("mulu.d %0,%1,%2" : "=r" (__x.__ll) : "r" (u), "r" (v)); \
+ (wh) = __x.__i.__h; \
+ (wl) = __x.__i.__l; \
+} while (0)
+#define udiv_qrnnd(q, r, n1, n0, d) \
+ ({union {UDItype __ll; \
+ struct {USItype __h, __l; } __i; \
+ } __x, __q; \
+ __x.__i.__h = (n1); __x.__i.__l = (n0); \
+ __asm__ ("divu.d %0,%1,%2" \
+ : "=r" (__q.__ll) : "r" (__x.__ll), "r" (d)); \
+ (r) = (n0) - __q.__l * (d); (q) = __q.__l; })
+#define UMUL_TIME 5
+#define UDIV_TIME 25
+#else
+#define UMUL_TIME 17
+#define UDIV_TIME 150
+#endif /* __m88110__ */
+#endif /* __m88000__ */
+
+/***************************************
+ ************** MIPS *****************
+ ***************************************/
+#if defined(__mips__) && W_TYPE_SIZE == 32
+#if __GNUC__ > 2 || __GNUC_MINOR__ >= 7
+#define umul_ppmm(w1, w0, u, v) \
+ __asm__ ("multu %2,%3" \
+ : "=l" ((USItype)(w0)), \
+ "=h" ((USItype)(w1)) \
+ : "d" ((USItype)(u)), \
+ "d" ((USItype)(v)))
+#else
+#define umul_ppmm(w1, w0, u, v) \
+ __asm__ ("multu %2,%3\n" \
+ "mflo %0\n" \
+ "mfhi %1" \
+ : "=d" ((USItype)(w0)), \
+ "=d" ((USItype)(w1)) \
+ : "d" ((USItype)(u)), \
+ "d" ((USItype)(v)))
+#endif
+#define UMUL_TIME 10
+#define UDIV_TIME 100
+#endif /* __mips__ */
+
+/***************************************
+ ************** MIPS/64 **************
+ ***************************************/
+#if (defined(__mips) && __mips >= 3) && W_TYPE_SIZE == 64
+#if __GNUC__ > 2 || __GNUC_MINOR__ >= 7
+#define umul_ppmm(w1, w0, u, v) \
+ __asm__ ("dmultu %2,%3" \
+ : "=l" ((UDItype)(w0)), \
+ "=h" ((UDItype)(w1)) \
+ : "d" ((UDItype)(u)), \
+ "d" ((UDItype)(v)))
+#else
+#define umul_ppmm(w1, w0, u, v) \
+ __asm__ ("dmultu %2,%3\n" \
+ "mflo %0\n" \
+ "mfhi %1" \
+ : "=d" ((UDItype)(w0)), \
+ "=d" ((UDItype)(w1)) \
+ : "d" ((UDItype)(u)), \
+ "d" ((UDItype)(v)))
+#endif
+#define UMUL_TIME 20
+#define UDIV_TIME 140
+#endif /* __mips__ */
+
+/***************************************
+ ************** 32000 ****************
+ ***************************************/
+#if defined(__ns32000__) && W_TYPE_SIZE == 32
+#define umul_ppmm(w1, w0, u, v) \
+ ({union {UDItype __ll; \
+ struct {USItype __l, __h; } __i; \
+ } __xx; \
+ __asm__ ("meid %2,%0" \
+ : "=g" (__xx.__ll) \
+ : "%0" ((USItype)(u)), \
+ "g" ((USItype)(v))); \
+ (w1) = __xx.__i.__h; (w0) = __xx.__i.__l; })
+#define __umulsidi3(u, v) \
+ ({UDItype __w; \
+ __asm__ ("meid %2,%0" \
+ : "=g" (__w) \
+ : "%0" ((USItype)(u)), \
+ "g" ((USItype)(v))); \
+ __w; })
+#define udiv_qrnnd(q, r, n1, n0, d) \
+ ({union {UDItype __ll; \
+ struct {USItype __l, __h; } __i; \
+ } __xx; \
+ __xx.__i.__h = (n1); __xx.__i.__l = (n0); \
+ __asm__ ("deid %2,%0" \
+ : "=g" (__xx.__ll) \
+ : "0" (__xx.__ll), \
+ "g" ((USItype)(d))); \
+ (r) = __xx.__i.__l; (q) = __xx.__i.__h; })
+#define count_trailing_zeros(count, x) \
+do { \
+ __asm__("ffsd %2,%0" \
+ : "=r"((USItype) (count)) \
+ : "0"((USItype) 0), "r"((USItype) (x))); \
+ } while (0)
+#endif /* __ns32000__ */
+
+/***************************************
+ ************** PPC ******************
+ ***************************************/
+#if (defined(_ARCH_PPC) || defined(_IBMR2)) && W_TYPE_SIZE == 32
+#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
+do { \
+ if (__builtin_constant_p(bh) && (bh) == 0) \
+ __asm__ ("{a%I4|add%I4c} %1,%3,%4\n\t{aze|addze} %0,%2" \
+ : "=r" ((USItype)(sh)), \
+ "=&r" ((USItype)(sl)) \
+ : "%r" ((USItype)(ah)), \
+ "%r" ((USItype)(al)), \
+ "rI" ((USItype)(bl))); \
+ else if (__builtin_constant_p(bh) && (bh) == ~(USItype) 0) \
+ __asm__ ("{a%I4|add%I4c} %1,%3,%4\n\t{ame|addme} %0,%2" \
+ : "=r" ((USItype)(sh)), \
+ "=&r" ((USItype)(sl)) \
+ : "%r" ((USItype)(ah)), \
+ "%r" ((USItype)(al)), \
+ "rI" ((USItype)(bl))); \
+ else \
+ __asm__ ("{a%I5|add%I5c} %1,%4,%5\n\t{ae|adde} %0,%2,%3" \
+ : "=r" ((USItype)(sh)), \
+ "=&r" ((USItype)(sl)) \
+ : "%r" ((USItype)(ah)), \
+ "r" ((USItype)(bh)), \
+ "%r" ((USItype)(al)), \
+ "rI" ((USItype)(bl))); \
+} while (0)
+#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
+do { \
+ if (__builtin_constant_p(ah) && (ah) == 0) \
+ __asm__ ("{sf%I3|subf%I3c} %1,%4,%3\n\t{sfze|subfze} %0,%2" \
+ : "=r" ((USItype)(sh)), \
+ "=&r" ((USItype)(sl)) \
+ : "r" ((USItype)(bh)), \
+ "rI" ((USItype)(al)), \
+ "r" ((USItype)(bl))); \
+ else if (__builtin_constant_p(ah) && (ah) == ~(USItype) 0) \
+ __asm__ ("{sf%I3|subf%I3c} %1,%4,%3\n\t{sfme|subfme} %0,%2" \
+ : "=r" ((USItype)(sh)), \
+ "=&r" ((USItype)(sl)) \
+ : "r" ((USItype)(bh)), \
+ "rI" ((USItype)(al)), \
+ "r" ((USItype)(bl))); \
+ else if (__builtin_constant_p(bh) && (bh) == 0) \
+ __asm__ ("{sf%I3|subf%I3c} %1,%4,%3\n\t{ame|addme} %0,%2" \
+ : "=r" ((USItype)(sh)), \
+ "=&r" ((USItype)(sl)) \
+ : "r" ((USItype)(ah)), \
+ "rI" ((USItype)(al)), \
+ "r" ((USItype)(bl))); \
+ else if (__builtin_constant_p(bh) && (bh) == ~(USItype) 0) \
+ __asm__ ("{sf%I3|subf%I3c} %1,%4,%3\n\t{aze|addze} %0,%2" \
+ : "=r" ((USItype)(sh)), \
+ "=&r" ((USItype)(sl)) \
+ : "r" ((USItype)(ah)), \
+ "rI" ((USItype)(al)), \
+ "r" ((USItype)(bl))); \
+ else \
+ __asm__ ("{sf%I4|subf%I4c} %1,%5,%4\n\t{sfe|subfe} %0,%3,%2" \
+ : "=r" ((USItype)(sh)), \
+ "=&r" ((USItype)(sl)) \
+ : "r" ((USItype)(ah)), \
+ "r" ((USItype)(bh)), \
+ "rI" ((USItype)(al)), \
+ "r" ((USItype)(bl))); \
+} while (0)
+#define count_leading_zeros(count, x) \
+ __asm__ ("{cntlz|cntlzw} %0,%1" \
+ : "=r" ((USItype)(count)) \
+ : "r" ((USItype)(x)))
+#define COUNT_LEADING_ZEROS_0 32
+#if defined(_ARCH_PPC)
+#define umul_ppmm(ph, pl, m0, m1) \
+do { \
+ USItype __m0 = (m0), __m1 = (m1); \
+ __asm__ ("mulhwu %0,%1,%2" \
+ : "=r" ((USItype) ph) \
+ : "%r" (__m0), \
+ "r" (__m1)); \
+ (pl) = __m0 * __m1; \
+} while (0)
+#define UMUL_TIME 15
+#define smul_ppmm(ph, pl, m0, m1) \
+do { \
+ SItype __m0 = (m0), __m1 = (m1); \
+ __asm__ ("mulhw %0,%1,%2" \
+ : "=r" ((SItype) ph) \
+ : "%r" (__m0), \
+ "r" (__m1)); \
+ (pl) = __m0 * __m1; \
+} while (0)
+#define SMUL_TIME 14
+#define UDIV_TIME 120
+#else
+#define umul_ppmm(xh, xl, m0, m1) \
+do { \
+ USItype __m0 = (m0), __m1 = (m1); \
+ __asm__ ("mul %0,%2,%3" \
+ : "=r" ((USItype)(xh)), \
+ "=q" ((USItype)(xl)) \
+ : "r" (__m0), \
+ "r" (__m1)); \
+ (xh) += ((((SItype) __m0 >> 31) & __m1) \
+ + (((SItype) __m1 >> 31) & __m0)); \
+} while (0)
+#define UMUL_TIME 8
+#define smul_ppmm(xh, xl, m0, m1) \
+ __asm__ ("mul %0,%2,%3" \
+ : "=r" ((SItype)(xh)), \
+ "=q" ((SItype)(xl)) \
+ : "r" (m0), \
+ "r" (m1))
+#define SMUL_TIME 4
+#define sdiv_qrnnd(q, r, nh, nl, d) \
+ __asm__ ("div %0,%2,%4" \
+ : "=r" ((SItype)(q)), "=q" ((SItype)(r)) \
+ : "r" ((SItype)(nh)), "1" ((SItype)(nl)), "r" ((SItype)(d)))
+#define UDIV_TIME 100
+#endif
+#endif /* Power architecture variants. */
+
+/***************************************
+ ************** PYR ******************
+ ***************************************/
+#if defined(__pyr__) && W_TYPE_SIZE == 32
+#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
+ __asm__ ("addw %5,%1\n" \
+ "addwc %3,%0" \
+ : "=r" ((USItype)(sh)), \
+ "=&r" ((USItype)(sl)) \
+ : "%0" ((USItype)(ah)), \
+ "g" ((USItype)(bh)), \
+ "%1" ((USItype)(al)), \
+ "g" ((USItype)(bl)))
+#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
+ __asm__ ("subw %5,%1\n" \
+ "subwb %3,%0" \
+ : "=r" ((USItype)(sh)), \
+ "=&r" ((USItype)(sl)) \
+ : "0" ((USItype)(ah)), \
+ "g" ((USItype)(bh)), \
+ "1" ((USItype)(al)), \
+ "g" ((USItype)(bl)))
+ /* This insn works on Pyramids with AP, XP, or MI CPUs, but not with SP. */
+#define umul_ppmm(w1, w0, u, v) \
+ ({union {UDItype __ll; \
+ struct {USItype __h, __l; } __i; \
+ } __xx; \
+ __asm__ ("movw %1,%R0\n" \
+ "uemul %2,%0" \
+ : "=&r" (__xx.__ll) \
+ : "g" ((USItype) (u)), \
+ "g" ((USItype)(v))); \
+ (w1) = __xx.__i.__h; (w0) = __xx.__i.__l; })
+#endif /* __pyr__ */
+
+/***************************************
+ ************** RT/ROMP **************
+ ***************************************/
+#if defined(__ibm032__) /* RT/ROMP */ && W_TYPE_SIZE == 32
+#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
+ __asm__ ("a %1,%5\n" \
+ "ae %0,%3" \
+ : "=r" ((USItype)(sh)), \
+ "=&r" ((USItype)(sl)) \
+ : "%0" ((USItype)(ah)), \
+ "r" ((USItype)(bh)), \
+ "%1" ((USItype)(al)), \
+ "r" ((USItype)(bl)))
+#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
+ __asm__ ("s %1,%5\n" \
+ "se %0,%3" \
+ : "=r" ((USItype)(sh)), \
+ "=&r" ((USItype)(sl)) \
+ : "0" ((USItype)(ah)), \
+ "r" ((USItype)(bh)), \
+ "1" ((USItype)(al)), \
+ "r" ((USItype)(bl)))
+#define umul_ppmm(ph, pl, m0, m1) \
+do { \
+ USItype __m0 = (m0), __m1 = (m1); \
+ __asm__ ( \
+ "s r2,r2\n" \
+ "mts r10,%2\n" \
+ "m r2,%3\n" \
+ "m r2,%3\n" \
+ "m r2,%3\n" \
+ "m r2,%3\n" \
+ "m r2,%3\n" \
+ "m r2,%3\n" \
+ "m r2,%3\n" \
+ "m r2,%3\n" \
+ "m r2,%3\n" \
+ "m r2,%3\n" \
+ "m r2,%3\n" \
+ "m r2,%3\n" \
+ "m r2,%3\n" \
+ "m r2,%3\n" \
+ "m r2,%3\n" \
+ "m r2,%3\n" \
+ "cas %0,r2,r0\n" \
+ "mfs r10,%1" \
+ : "=r" ((USItype)(ph)), \
+ "=r" ((USItype)(pl)) \
+ : "%r" (__m0), \
+ "r" (__m1) \
+ : "r2"); \
+ (ph) += ((((SItype) __m0 >> 31) & __m1) \
+ + (((SItype) __m1 >> 31) & __m0)); \
+} while (0)
+#define UMUL_TIME 20
+#define UDIV_TIME 200
+#define count_leading_zeros(count, x) \
+do { \
+ if ((x) >= 0x10000) \
+ __asm__ ("clz %0,%1" \
+ : "=r" ((USItype)(count)) \
+ : "r" ((USItype)(x) >> 16)); \
+ else { \
+ __asm__ ("clz %0,%1" \
+ : "=r" ((USItype)(count)) \
+ : "r" ((USItype)(x))); \
+ (count) += 16; \
+ } \
+} while (0)
+#endif /* RT/ROMP */
+
+/***************************************
+ ************** SH2 ******************
+ ***************************************/
+#if (defined(__sh2__) || defined(__sh3__) || defined(__SH4__)) \
+ && W_TYPE_SIZE == 32
+#define umul_ppmm(w1, w0, u, v) \
+ __asm__ ( \
+ "dmulu.l %2,%3\n" \
+ "sts macl,%1\n" \
+ "sts mach,%0" \
+ : "=r" ((USItype)(w1)), \
+ "=r" ((USItype)(w0)) \
+ : "r" ((USItype)(u)), \
+ "r" ((USItype)(v)) \
+ : "macl", "mach")
+#define UMUL_TIME 5
+#endif
+
+/***************************************
+ ************** SPARC ****************
+ ***************************************/
+#if defined(__sparc__) && W_TYPE_SIZE == 32
+#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
+ __asm__ ("addcc %r4,%5,%1\n" \
+ "addx %r2,%3,%0" \
+ : "=r" ((USItype)(sh)), \
+ "=&r" ((USItype)(sl)) \
+ : "%rJ" ((USItype)(ah)), \
+ "rI" ((USItype)(bh)), \
+ "%rJ" ((USItype)(al)), \
+ "rI" ((USItype)(bl)) \
+ __CLOBBER_CC)
+#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
+ __asm__ ("subcc %r4,%5,%1\n" \
+ "subx %r2,%3,%0" \
+ : "=r" ((USItype)(sh)), \
+ "=&r" ((USItype)(sl)) \
+ : "rJ" ((USItype)(ah)), \
+ "rI" ((USItype)(bh)), \
+ "rJ" ((USItype)(al)), \
+ "rI" ((USItype)(bl)) \
+ __CLOBBER_CC)
+#if defined(__sparc_v8__)
+/* Don't match immediate range because, 1) it is not often useful,
+ 2) the 'I' flag thinks of the range as a 13 bit signed interval,
+ while we want to match a 13 bit interval, sign extended to 32 bits,
+ but INTERPRETED AS UNSIGNED. */
+#define umul_ppmm(w1, w0, u, v) \
+ __asm__ ("umul %2,%3,%1;rd %%y,%0" \
+ : "=r" ((USItype)(w1)), \
+ "=r" ((USItype)(w0)) \
+ : "r" ((USItype)(u)), \
+ "r" ((USItype)(v)))
+#define UMUL_TIME 5
+#ifndef SUPERSPARC /* SuperSPARC's udiv only handles 53 bit dividends */
+#define udiv_qrnnd(q, r, n1, n0, d) \
+do { \
+ USItype __q; \
+ __asm__ ("mov %1,%%y;nop;nop;nop;udiv %2,%3,%0" \
+ : "=r" ((USItype)(__q)) \
+ : "r" ((USItype)(n1)), \
+ "r" ((USItype)(n0)), \
+ "r" ((USItype)(d))); \
+ (r) = (n0) - __q * (d); \
+ (q) = __q; \
+} while (0)
+#define UDIV_TIME 25
+#endif /* SUPERSPARC */
+#else /* ! __sparc_v8__ */
+#if defined(__sparclite__)
+/* This has hardware multiply but not divide. It also has two additional
+ instructions scan (ffs from high bit) and divscc. */
+#define umul_ppmm(w1, w0, u, v) \
+ __asm__ ("umul %2,%3,%1;rd %%y,%0" \
+ : "=r" ((USItype)(w1)), \
+ "=r" ((USItype)(w0)) \
+ : "r" ((USItype)(u)), \
+ "r" ((USItype)(v)))
+#define UMUL_TIME 5
+#define udiv_qrnnd(q, r, n1, n0, d) \
+ __asm__ ("! Inlined udiv_qrnnd\n" \
+ "wr %%g0,%2,%%y ! Not a delayed write for sparclite\n" \
+ "tst %%g0\n" \
+ "divscc %3,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%%g1\n" \
+ "divscc %%g1,%4,%0\n" \
+ "rd %%y,%1\n" \
+ "bl,a 1f\n" \
+ "add %1,%4,%1\n" \
+ "1: ! End of inline udiv_qrnnd" \
+ : "=r" ((USItype)(q)), \
+ "=r" ((USItype)(r)) \
+ : "r" ((USItype)(n1)), \
+ "r" ((USItype)(n0)), \
+ "rI" ((USItype)(d)) \
+ : "%g1" __AND_CLOBBER_CC)
+#define UDIV_TIME 37
+#define count_leading_zeros(count, x) \
+ __asm__ ("scan %1,0,%0" \
+ : "=r" ((USItype)(x)) \
+ : "r" ((USItype)(count)))
+/* Early sparclites return 63 for an argument of 0, but they warn that future
+ implementations might change this. Therefore, leave COUNT_LEADING_ZEROS_0
+ undefined. */
+#endif /* __sparclite__ */
+#endif /* __sparc_v8__ */
+ /* Default to sparc v7 versions of umul_ppmm and udiv_qrnnd. */
+#ifndef umul_ppmm
+#define umul_ppmm(w1, w0, u, v) \
+ __asm__ ("! Inlined umul_ppmm\n" \
+ "wr %%g0,%2,%%y ! SPARC has 0-3 delay insn after a wr\n" \
+ "sra %3,31,%%g2 ! Don't move this insn\n" \
+ "and %2,%%g2,%%g2 ! Don't move this insn\n" \
+ "andcc %%g0,0,%%g1 ! Don't move this insn\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,%3,%%g1\n" \
+ "mulscc %%g1,0,%%g1\n" \
+ "add %%g1,%%g2,%0\n" \
+ "rd %%y,%1" \
+ : "=r" ((USItype)(w1)), \
+ "=r" ((USItype)(w0)) \
+ : "%rI" ((USItype)(u)), \
+ "r" ((USItype)(v)) \
+ : "%g1", "%g2" __AND_CLOBBER_CC)
+#define UMUL_TIME 39 /* 39 instructions */
+#endif
+#ifndef udiv_qrnnd
+#ifndef LONGLONG_STANDALONE
+#define udiv_qrnnd(q, r, n1, n0, d) \
+do { USItype __r; \
+ (q) = __udiv_qrnnd(&__r, (n1), (n0), (d)); \
+ (r) = __r; \
+} while (0)
+ extern USItype __udiv_qrnnd();
+#define UDIV_TIME 140
+#endif /* LONGLONG_STANDALONE */
+#endif /* udiv_qrnnd */
+#endif /* __sparc__ */
+
+/***************************************
+ ************** VAX ******************
+ ***************************************/
+#if defined(__vax__) && W_TYPE_SIZE == 32
+#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
+ __asm__ ("addl2 %5,%1\n" \
+ "adwc %3,%0" \
+ : "=g" ((USItype)(sh)), \
+ "=&g" ((USItype)(sl)) \
+ : "%0" ((USItype)(ah)), \
+ "g" ((USItype)(bh)), \
+ "%1" ((USItype)(al)), \
+ "g" ((USItype)(bl)))
+#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
+ __asm__ ("subl2 %5,%1\n" \
+ "sbwc %3,%0" \
+ : "=g" ((USItype)(sh)), \
+ "=&g" ((USItype)(sl)) \
+ : "0" ((USItype)(ah)), \
+ "g" ((USItype)(bh)), \
+ "1" ((USItype)(al)), \
+ "g" ((USItype)(bl)))
+#define umul_ppmm(xh, xl, m0, m1) \
+do { \
+ union {UDItype __ll; \
+ struct {USItype __l, __h; } __i; \
+ } __xx; \
+ USItype __m0 = (m0), __m1 = (m1); \
+ __asm__ ("emul %1,%2,$0,%0" \
+ : "=g" (__xx.__ll) \
+ : "g" (__m0), \
+ "g" (__m1)); \
+ (xh) = __xx.__i.__h; (xl) = __xx.__i.__l; \
+ (xh) += ((((SItype) __m0 >> 31) & __m1) \
+ + (((SItype) __m1 >> 31) & __m0)); \
+} while (0)
+#define sdiv_qrnnd(q, r, n1, n0, d) \
+do { \
+ union {DItype __ll; \
+ struct {SItype __l, __h; } __i; \
+ } __xx; \
+ __xx.__i.__h = n1; __xx.__i.__l = n0; \
+ __asm__ ("ediv %3,%2,%0,%1" \
+ : "=g" (q), "=g" (r) \
+ : "g" (__xx.__ll), "g" (d)); \
+} while (0)
+#endif /* __vax__ */
+
+/***************************************
+ ************** Z8000 ****************
+ ***************************************/
+#if defined(__z8000__) && W_TYPE_SIZE == 16
+#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
+ __asm__ ("add %H1,%H5\n\tadc %H0,%H3" \
+ : "=r" ((unsigned int)(sh)), \
+ "=&r" ((unsigned int)(sl)) \
+ : "%0" ((unsigned int)(ah)), \
+ "r" ((unsigned int)(bh)), \
+ "%1" ((unsigned int)(al)), \
+ "rQR" ((unsigned int)(bl)))
+#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
+ __asm__ ("sub %H1,%H5\n\tsbc %H0,%H3" \
+ : "=r" ((unsigned int)(sh)), \
+ "=&r" ((unsigned int)(sl)) \
+ : "0" ((unsigned int)(ah)), \
+ "r" ((unsigned int)(bh)), \
+ "1" ((unsigned int)(al)), \
+ "rQR" ((unsigned int)(bl)))
+#define umul_ppmm(xh, xl, m0, m1) \
+do { \
+ union {long int __ll; \
+ struct {unsigned int __h, __l; } __i; \
+ } __xx; \
+ unsigned int __m0 = (m0), __m1 = (m1); \
+ __asm__ ("mult %S0,%H3" \
+ : "=r" (__xx.__i.__h), \
+ "=r" (__xx.__i.__l) \
+ : "%1" (__m0), \
+ "rQR" (__m1)); \
+ (xh) = __xx.__i.__h; (xl) = __xx.__i.__l; \
+ (xh) += ((((signed int) __m0 >> 15) & __m1) \
+ + (((signed int) __m1 >> 15) & __m0)); \
+} while (0)
+#endif /* __z8000__ */
+
+#endif /* __GNUC__ */
+
+/***************************************
+ *********** Generic Versions ********
+ ***************************************/
+#if !defined(umul_ppmm) && defined(__umulsidi3)
+#define umul_ppmm(ph, pl, m0, m1) \
+{ \
+ UDWtype __ll = __umulsidi3(m0, m1); \
+ ph = (UWtype) (__ll >> W_TYPE_SIZE); \
+ pl = (UWtype) __ll; \
+}
+#endif
+
+#if !defined(__umulsidi3)
+#define __umulsidi3(u, v) \
+ ({UWtype __hi, __lo; \
+ umul_ppmm(__hi, __lo, u, v); \
+ ((UDWtype) __hi << W_TYPE_SIZE) | __lo; })
+#endif
+
+ /* If this machine has no inline assembler, use C macros. */
+
+#if !defined(add_ssaaaa)
+#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
+do { \
+ UWtype __x; \
+ __x = (al) + (bl); \
+ (sh) = (ah) + (bh) + (__x < (al)); \
+ (sl) = __x; \
+} while (0)
+#endif
+
+#if !defined(sub_ddmmss)
+#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
+do { \
+ UWtype __x; \
+ __x = (al) - (bl); \
+ (sh) = (ah) - (bh) - (__x > (al)); \
+ (sl) = __x; \
+} while (0)
+#endif
+
+#if !defined(umul_ppmm)
+#define umul_ppmm(w1, w0, u, v) \
+do { \
+ UWtype __x0, __x1, __x2, __x3; \
+ UHWtype __ul, __vl, __uh, __vh; \
+ UWtype __u = (u), __v = (v); \
+ \
+ __ul = __ll_lowpart(__u); \
+ __uh = __ll_highpart(__u); \
+ __vl = __ll_lowpart(__v); \
+ __vh = __ll_highpart(__v); \
+ \
+ __x0 = (UWtype) __ul * __vl; \
+ __x1 = (UWtype) __ul * __vh; \
+ __x2 = (UWtype) __uh * __vl; \
+ __x3 = (UWtype) __uh * __vh; \
+ \
+ __x1 += __ll_highpart(__x0);/* this can't give carry */ \
+ __x1 += __x2; /* but this indeed can */ \
+ if (__x1 < __x2) /* did we get it? */ \
+ __x3 += __ll_B; /* yes, add it in the proper pos. */ \
+ \
+ (w1) = __x3 + __ll_highpart(__x1); \
+ (w0) = (__ll_lowpart(__x1) << W_TYPE_SIZE/2) + __ll_lowpart(__x0); \
+} while (0)
+#endif
+
+#if !defined(umul_ppmm)
+#define smul_ppmm(w1, w0, u, v) \
+do { \
+ UWtype __w1; \
+ UWtype __m0 = (u), __m1 = (v); \
+ umul_ppmm(__w1, w0, __m0, __m1); \
+ (w1) = __w1 - (-(__m0 >> (W_TYPE_SIZE - 1)) & __m1) \
+ - (-(__m1 >> (W_TYPE_SIZE - 1)) & __m0); \
+} while (0)
+#endif
+
+ /* Define this unconditionally, so it can be used for debugging. */
+#define __udiv_qrnnd_c(q, r, n1, n0, d) \
+do { \
+ UWtype __d1, __d0, __q1, __q0, __r1, __r0, __m; \
+ __d1 = __ll_highpart(d); \
+ __d0 = __ll_lowpart(d); \
+ \
+ __r1 = (n1) % __d1; \
+ __q1 = (n1) / __d1; \
+ __m = (UWtype) __q1 * __d0; \
+ __r1 = __r1 * __ll_B | __ll_highpart(n0); \
+ if (__r1 < __m) { \
+ __q1--, __r1 += (d); \
+ if (__r1 >= (d)) /* i.e. we didn't get carry when adding to __r1 */ \
+ if (__r1 < __m) \
+ __q1--, __r1 += (d); \
+ } \
+ __r1 -= __m; \
+ \
+ __r0 = __r1 % __d1; \
+ __q0 = __r1 / __d1; \
+ __m = (UWtype) __q0 * __d0; \
+ __r0 = __r0 * __ll_B | __ll_lowpart(n0); \
+ if (__r0 < __m) { \
+ __q0--, __r0 += (d); \
+ if (__r0 >= (d)) \
+ if (__r0 < __m) \
+ __q0--, __r0 += (d); \
+ } \
+ __r0 -= __m; \
+ \
+ (q) = (UWtype) __q1 * __ll_B | __q0; \
+ (r) = __r0; \
+} while (0)
+
+/* If the processor has no udiv_qrnnd but sdiv_qrnnd, go through
+ __udiv_w_sdiv (defined in libgcc or elsewhere). */
+#if !defined(udiv_qrnnd) && defined(sdiv_qrnnd)
+#define udiv_qrnnd(q, r, nh, nl, d) \
+do { \
+ UWtype __r; \
+ (q) = __MPN(udiv_w_sdiv) (&__r, nh, nl, d); \
+ (r) = __r; \
+} while (0)
+#endif
+
+ /* If udiv_qrnnd was not defined for this processor, use __udiv_qrnnd_c. */
+#if !defined(udiv_qrnnd)
+#define UDIV_NEEDS_NORMALIZATION 1
+#define udiv_qrnnd __udiv_qrnnd_c
+#endif
+
+#undef count_leading_zeros
+#if !defined(count_leading_zeros)
+ extern
+#ifdef __STDC__
+ const
+#endif
+ unsigned char __clz_tab[];
+#define count_leading_zeros(count, x) \
+do { \
+ UWtype __xr = (x); \
+ UWtype __a; \
+ \
+ if (W_TYPE_SIZE <= 32) { \
+ __a = __xr < ((UWtype) 1 << 2*__BITS4) \
+ ? (__xr < ((UWtype) 1 << __BITS4) ? 0 : __BITS4) \
+ : (__xr < ((UWtype) 1 << 3*__BITS4) ? 2*__BITS4 : 3*__BITS4); \
+ } \
+ else { \
+ for (__a = W_TYPE_SIZE - 8; __a > 0; __a -= 8) \
+ if (((__xr >> __a) & 0xff) != 0) \
+ break; \
+ } \
+ \
+ (count) = W_TYPE_SIZE - (__clz_tab[__xr >> __a] + __a); \
+} while (0)
+ /* This version gives a well-defined value for zero. */
+#define COUNT_LEADING_ZEROS_0 W_TYPE_SIZE
+#endif
+
+#if !defined(count_trailing_zeros)
+/* Define count_trailing_zeros using count_leading_zeros. The latter might be
+ defined in asm, but if it is not, the C version above is good enough. */
+#define count_trailing_zeros(count, x) \
+do { \
+ UWtype __ctz_x = (x); \
+ UWtype __ctz_c; \
+ count_leading_zeros(__ctz_c, __ctz_x & -__ctz_x); \
+ (count) = W_TYPE_SIZE - 1 - __ctz_c; \
+} while (0)
+#endif
+
+#ifndef UDIV_NEEDS_NORMALIZATION
+#define UDIV_NEEDS_NORMALIZATION 0
+#endif
--- /dev/null
+/* mpi-add.c - MPI functions
+ * Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
+ * Copyright (C) 1994, 1996 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ *
+ * Note: This code is heavily based on the GNU MP Library.
+ * Actually it's the same code with only minor changes in the
+ * way the data is stored; this is to support the abstraction
+ * of an optional secure memory allocation which may be used
+ * to avoid revealing of sensitive data due to paging etc.
+ * The GNU MP Library itself is published under the LGPL;
+ * however I decided to publish this code under the plain GPL.
+ */
+
+#include "mpi-internal.h"
+
+/****************
+ * Add the unsigned integer V to the mpi-integer U and store the
+ * result in W. U and V may be the same.
+ */
+int mpi_add_ui(MPI w, const MPI u, unsigned long v)
+{
+ mpi_ptr_t wp, up;
+ mpi_size_t usize, wsize;
+ int usign, wsign;
+
+ usize = u->nlimbs;
+ usign = u->sign;
+ wsign = 0;
+
+ /* If not space for W (and possible carry), increase space. */
+ wsize = usize + 1;
+ if (w->alloced < wsize)
+ if (mpi_resize(w, wsize) < 0)
+ return -ENOMEM;
+
+ /* These must be after realloc (U may be the same as W). */
+ up = u->d;
+ wp = w->d;
+
+ if (!usize) { /* simple */
+ wp[0] = v;
+ wsize = v ? 1 : 0;
+ } else if (!usign) { /* mpi is not negative */
+ mpi_limb_t cy;
+ cy = mpihelp_add_1(wp, up, usize, v);
+ wp[usize] = cy;
+ wsize = usize + cy;
+ } else { /* The signs are different. Need exact comparison to determine
+ * which operand to subtract from which. */
+ if (usize == 1 && up[0] < v) {
+ wp[0] = v - up[0];
+ wsize = 1;
+ } else {
+ mpihelp_sub_1(wp, up, usize, v);
+ /* Size can decrease with at most one limb. */
+ wsize = usize - (wp[usize - 1] == 0);
+ wsign = 1;
+ }
+ }
+
+ w->nlimbs = wsize;
+ w->sign = wsign;
+ return 0;
+}
+
+int mpi_add(MPI w, MPI u, MPI v)
+{
+ mpi_ptr_t wp, up, vp;
+ mpi_size_t usize, vsize, wsize;
+ int usign, vsign, wsign;
+
+ if (u->nlimbs < v->nlimbs) { /* Swap U and V. */
+ usize = v->nlimbs;
+ usign = v->sign;
+ vsize = u->nlimbs;
+ vsign = u->sign;
+ wsize = usize + 1;
+ if (RESIZE_IF_NEEDED(w, wsize) < 0)
+ return -ENOMEM;
+ /* These must be after realloc (u or v may be the same as w). */
+ up = v->d;
+ vp = u->d;
+ } else {
+ usize = u->nlimbs;
+ usign = u->sign;
+ vsize = v->nlimbs;
+ vsign = v->sign;
+ wsize = usize + 1;
+ if (RESIZE_IF_NEEDED(w, wsize) < 0)
+ return -ENOMEM;
+ /* These must be after realloc (u or v may be the same as w). */
+ up = u->d;
+ vp = v->d;
+ }
+ wp = w->d;
+ wsign = 0;
+
+ if (!vsize) { /* simple */
+ MPN_COPY(wp, up, usize);
+ wsize = usize;
+ wsign = usign;
+ } else if (usign != vsign) { /* different sign */
+ /* This test is right since USIZE >= VSIZE */
+ if (usize != vsize) {
+ mpihelp_sub(wp, up, usize, vp, vsize);
+ wsize = usize;
+ MPN_NORMALIZE(wp, wsize);
+ wsign = usign;
+ } else if (mpihelp_cmp(up, vp, usize) < 0) {
+ mpihelp_sub_n(wp, vp, up, usize);
+ wsize = usize;
+ MPN_NORMALIZE(wp, wsize);
+ if (!usign)
+ wsign = 1;
+ } else {
+ mpihelp_sub_n(wp, up, vp, usize);
+ wsize = usize;
+ MPN_NORMALIZE(wp, wsize);
+ if (usign)
+ wsign = 1;
+ }
+ } else { /* U and V have same sign. Add them. */
+ mpi_limb_t cy = mpihelp_add(wp, up, usize, vp, vsize);
+ wp[usize] = cy;
+ wsize = usize + cy;
+ if (usign)
+ wsign = 1;
+ }
+
+ w->nlimbs = wsize;
+ w->sign = wsign;
+ return 0;
+}
+
+/****************
+ * Subtract the unsigned integer V from the mpi-integer U and store the
+ * result in W.
+ */
+int mpi_sub_ui(MPI w, MPI u, unsigned long v)
+{
+ mpi_ptr_t wp, up;
+ mpi_size_t usize, wsize;
+ int usign, wsign;
+
+ usize = u->nlimbs;
+ usign = u->sign;
+ wsign = 0;
+
+ /* If not space for W (and possible carry), increase space. */
+ wsize = usize + 1;
+ if (w->alloced < wsize)
+ if (mpi_resize(w, wsize) < 0)
+ return -ENOMEM;
+
+ /* These must be after realloc (U may be the same as W). */
+ up = u->d;
+ wp = w->d;
+
+ if (!usize) { /* simple */
+ wp[0] = v;
+ wsize = v ? 1 : 0;
+ wsign = 1;
+ } else if (usign) { /* mpi and v are negative */
+ mpi_limb_t cy;
+ cy = mpihelp_add_1(wp, up, usize, v);
+ wp[usize] = cy;
+ wsize = usize + cy;
+ } else { /* The signs are different. Need exact comparison to determine
+ * which operand to subtract from which. */
+ if (usize == 1 && up[0] < v) {
+ wp[0] = v - up[0];
+ wsize = 1;
+ wsign = 1;
+ } else {
+ mpihelp_sub_1(wp, up, usize, v);
+ /* Size can decrease with at most one limb. */
+ wsize = usize - (wp[usize - 1] == 0);
+ }
+ }
+
+ w->nlimbs = wsize;
+ w->sign = wsign;
+ return 0;
+}
+
+int mpi_sub(MPI w, MPI u, MPI v)
+{
+ int rc;
+
+ if (w == v) {
+ MPI vv;
+ if (mpi_copy(&vv, v) < 0)
+ return -ENOMEM;
+ vv->sign = !vv->sign;
+ rc = mpi_add(w, u, vv);
+ mpi_free(vv);
+ } else {
+ /* fixme: this is not thread-save (we temp. modify v) */
+ v->sign = !v->sign;
+ rc = mpi_add(w, u, v);
+ v->sign = !v->sign;
+ }
+ return rc;
+}
+
+int mpi_addm(MPI w, MPI u, MPI v, MPI m)
+{
+ if (mpi_add(w, u, v) < 0 || mpi_fdiv_r(w, w, m) < 0)
+ return -ENOMEM;
+ return 0;
+}
+
+int mpi_subm(MPI w, MPI u, MPI v, MPI m)
+{
+ if (mpi_sub(w, u, v) < 0 || mpi_fdiv_r(w, w, m) < 0)
+ return -ENOMEM;
+ return 0;
+}
--- /dev/null
+/* mpi-bit.c - MPI bit level fucntions
+ * Copyright (C) 1998, 1999 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#include "mpi-internal.h"
+#include "longlong.h"
+
+const unsigned char __clz_tab[] = {
+ 0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5,
+ 5, 5, 5, 5, 5, 5, 5, 5,
+ 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+ 6, 6, 6, 6, 6, 6, 6, 6,
+ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+ 7, 7, 7, 7, 7, 7, 7, 7,
+ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+ 7, 7, 7, 7, 7, 7, 7, 7,
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8,
+};
+
+#define A_LIMB_1 ((mpi_limb_t) 1)
+
+/****************
+ * Sometimes we have MSL (most significant limbs) which are 0;
+ * this is for some reasons not good, so this function removes them.
+ */
+void mpi_normalize(MPI a)
+{
+ for (; a->nlimbs && !a->d[a->nlimbs - 1]; a->nlimbs--)
+ ;
+}
+
+/****************
+ * Return the number of bits in A.
+ */
+unsigned mpi_get_nbits(MPI a)
+{
+ unsigned n;
+
+ mpi_normalize(a);
+
+ if (a->nlimbs) {
+ mpi_limb_t alimb = a->d[a->nlimbs - 1];
+ if (alimb)
+ count_leading_zeros(n, alimb);
+ else
+ n = BITS_PER_MPI_LIMB;
+ n = BITS_PER_MPI_LIMB - n + (a->nlimbs - 1) * BITS_PER_MPI_LIMB;
+ } else
+ n = 0;
+ return n;
+}
+EXPORT_SYMBOL_GPL(mpi_get_nbits);
+
+/****************
+ * Test whether bit N is set.
+ */
+int mpi_test_bit(MPI a, unsigned n)
+{
+ unsigned limbno, bitno;
+ mpi_limb_t limb;
+
+ limbno = n / BITS_PER_MPI_LIMB;
+ bitno = n % BITS_PER_MPI_LIMB;
+
+ if (limbno >= a->nlimbs)
+ return 0; /* too far left: this is a 0 */
+ limb = a->d[limbno];
+ return (limb & (A_LIMB_1 << bitno)) ? 1 : 0;
+}
+
+/****************
+ * Set bit N of A.
+ */
+int mpi_set_bit(MPI a, unsigned n)
+{
+ unsigned limbno, bitno;
+
+ limbno = n / BITS_PER_MPI_LIMB;
+ bitno = n % BITS_PER_MPI_LIMB;
+
+ if (limbno >= a->nlimbs) { /* resize */
+ if (a->alloced >= limbno)
+ if (mpi_resize(a, limbno + 1) < 0)
+ return -ENOMEM;
+ a->nlimbs = limbno + 1;
+ }
+ a->d[limbno] |= (A_LIMB_1 << bitno);
+ return 0;
+}
+
+/****************
+ * Set bit N of A. and clear all bits above
+ */
+int mpi_set_highbit(MPI a, unsigned n)
+{
+ unsigned limbno, bitno;
+
+ limbno = n / BITS_PER_MPI_LIMB;
+ bitno = n % BITS_PER_MPI_LIMB;
+
+ if (limbno >= a->nlimbs) { /* resize */
+ if (a->alloced >= limbno)
+ if (mpi_resize(a, limbno + 1) < 0)
+ return -ENOMEM;
+ a->nlimbs = limbno + 1;
+ }
+ a->d[limbno] |= (A_LIMB_1 << bitno);
+ for (bitno++; bitno < BITS_PER_MPI_LIMB; bitno++)
+ a->d[limbno] &= ~(A_LIMB_1 << bitno);
+ a->nlimbs = limbno + 1;
+ return 0;
+}
+
+/****************
+ * clear bit N of A and all bits above
+ */
+void mpi_clear_highbit(MPI a, unsigned n)
+{
+ unsigned limbno, bitno;
+
+ limbno = n / BITS_PER_MPI_LIMB;
+ bitno = n % BITS_PER_MPI_LIMB;
+
+ if (limbno >= a->nlimbs)
+ return; /* not allocated, so need to clear bits :-) */
+
+ for (; bitno < BITS_PER_MPI_LIMB; bitno++)
+ a->d[limbno] &= ~(A_LIMB_1 << bitno);
+ a->nlimbs = limbno + 1;
+}
+
+/****************
+ * Clear bit N of A.
+ */
+void mpi_clear_bit(MPI a, unsigned n)
+{
+ unsigned limbno, bitno;
+
+ limbno = n / BITS_PER_MPI_LIMB;
+ bitno = n % BITS_PER_MPI_LIMB;
+
+ if (limbno >= a->nlimbs)
+ return; /* don't need to clear this bit, it's to far to left */
+ a->d[limbno] &= ~(A_LIMB_1 << bitno);
+}
+
+/****************
+ * Shift A by N bits to the right
+ * FIXME: should use alloc_limb if X and A are same.
+ */
+int mpi_rshift(MPI x, MPI a, unsigned n)
+{
+ mpi_ptr_t xp;
+ mpi_size_t xsize;
+
+ xsize = a->nlimbs;
+ x->sign = a->sign;
+ if (RESIZE_IF_NEEDED(x, (size_t) xsize) < 0)
+ return -ENOMEM;
+ xp = x->d;
+
+ if (xsize) {
+ mpihelp_rshift(xp, a->d, xsize, n);
+ MPN_NORMALIZE(xp, xsize);
+ }
+ x->nlimbs = xsize;
+ return 0;
+}
+
+/****************
+ * Shift A by COUNT limbs to the left
+ * This is used only within the MPI library
+ */
+int mpi_lshift_limbs(MPI a, unsigned int count)
+{
+ mpi_ptr_t ap = a->d;
+ int n = a->nlimbs;
+ int i;
+
+ if (!count || !n)
+ return 0;
+
+ if (RESIZE_IF_NEEDED(a, n + count) < 0)
+ return -ENOMEM;
+
+ for (i = n - 1; i >= 0; i--)
+ ap[i + count] = ap[i];
+ for (i = 0; i < count; i++)
+ ap[i] = 0;
+ a->nlimbs += count;
+ return 0;
+}
+
+/****************
+ * Shift A by COUNT limbs to the right
+ * This is used only within the MPI library
+ */
+void mpi_rshift_limbs(MPI a, unsigned int count)
+{
+ mpi_ptr_t ap = a->d;
+ mpi_size_t n = a->nlimbs;
+ unsigned int i;
+
+ if (count >= n) {
+ a->nlimbs = 0;
+ return;
+ }
+
+ for (i = 0; i < n - count; i++)
+ ap[i] = ap[i + count];
+ ap[i] = 0;
+ a->nlimbs -= count;
+}
--- /dev/null
+/* mpi-cmp.c - MPI functions
+ * Copyright (C) 1998, 1999 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#include "mpi-internal.h"
+
+int mpi_cmp_ui(MPI u, unsigned long v)
+{
+ mpi_limb_t limb = v;
+
+ mpi_normalize(u);
+ if (!u->nlimbs && !limb)
+ return 0;
+ if (u->sign)
+ return -1;
+ if (u->nlimbs > 1)
+ return 1;
+
+ if (u->d[0] == limb)
+ return 0;
+ else if (u->d[0] > limb)
+ return 1;
+ else
+ return -1;
+}
+
+int mpi_cmp(MPI u, MPI v)
+{
+ mpi_size_t usize, vsize;
+ int cmp;
+
+ mpi_normalize(u);
+ mpi_normalize(v);
+ usize = u->nlimbs;
+ vsize = v->nlimbs;
+ if (!u->sign && v->sign)
+ return 1;
+ if (u->sign && !v->sign)
+ return -1;
+ if (usize != vsize && !u->sign && !v->sign)
+ return usize - vsize;
+ if (usize != vsize && u->sign && v->sign)
+ return vsize + usize;
+ if (!usize)
+ return 0;
+ cmp = mpihelp_cmp(u->d, v->d, usize);
+ if (!cmp)
+ return 0;
+ if ((cmp < 0 ? 1 : 0) == (u->sign ? 1 : 0))
+ return 1;
+ return -1;
+}
--- /dev/null
+/* mpi-div.c - MPI functions
+ * Copyright (C) 1994, 1996 Free Software Foundation, Inc.
+ * Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ *
+ * Note: This code is heavily based on the GNU MP Library.
+ * Actually it's the same code with only minor changes in the
+ * way the data is stored; this is to support the abstraction
+ * of an optional secure memory allocation which may be used
+ * to avoid revealing of sensitive data due to paging etc.
+ * The GNU MP Library itself is published under the LGPL;
+ * however I decided to publish this code under the plain GPL.
+ */
+
+#include <linux/string.h>
+#include "mpi-internal.h"
+#include "longlong.h"
+
+int mpi_fdiv_r(MPI rem, MPI dividend, MPI divisor)
+{
+ int rc = -ENOMEM;
+ int divisor_sign = divisor->sign;
+ MPI temp_divisor = NULL;
+
+ /* We need the original value of the divisor after the remainder has been
+ * preliminary calculated. We have to copy it to temporary space if it's
+ * the same variable as REM. */
+ if (rem == divisor) {
+ if (mpi_copy(&temp_divisor, divisor) < 0)
+ goto nomem;
+ divisor = temp_divisor;
+ }
+
+ if (mpi_tdiv_qr(NULL, rem, dividend, divisor) < 0)
+ goto nomem;
+ if (((divisor_sign ? 1 : 0) ^ (dividend->sign ? 1 : 0)) && rem->nlimbs)
+ if (mpi_add(rem, rem, divisor) < 0)
+ goto nomem;
+
+ rc = 0;
+
+nomem:
+ if (temp_divisor)
+ mpi_free(temp_divisor);
+ return rc;
+}
+
+/****************
+ * Division rounding the quotient towards -infinity.
+ * The remainder gets the same sign as the denominator.
+ * rem is optional
+ */
+
+ulong mpi_fdiv_r_ui(MPI rem, MPI dividend, ulong divisor)
+{
+ mpi_limb_t rlimb;
+
+ rlimb = mpihelp_mod_1(dividend->d, dividend->nlimbs, divisor);
+ if (rlimb && dividend->sign)
+ rlimb = divisor - rlimb;
+
+ if (rem) {
+ rem->d[0] = rlimb;
+ rem->nlimbs = rlimb ? 1 : 0;
+ }
+ return rlimb;
+}
+
+int mpi_fdiv_q(MPI quot, MPI dividend, MPI divisor)
+{
+ MPI tmp = mpi_alloc(mpi_get_nlimbs(quot));
+ if (!tmp)
+ return -ENOMEM;
+ mpi_fdiv_qr(quot, tmp, dividend, divisor);
+ mpi_free(tmp);
+ return 0;
+}
+
+int mpi_fdiv_qr(MPI quot, MPI rem, MPI dividend, MPI divisor)
+{
+ int divisor_sign = divisor->sign;
+ MPI temp_divisor = NULL;
+
+ if (quot == divisor || rem == divisor) {
+ if (mpi_copy(&temp_divisor, divisor) < 0)
+ return -ENOMEM;
+ divisor = temp_divisor;
+ }
+
+ if (mpi_tdiv_qr(quot, rem, dividend, divisor) < 0)
+ goto nomem;
+
+ if ((divisor_sign ^ dividend->sign) && rem->nlimbs) {
+ if (mpi_sub_ui(quot, quot, 1) < 0)
+ goto nomem;
+ if (mpi_add(rem, rem, divisor) < 0)
+ goto nomem;
+ }
+
+ if (temp_divisor)
+ mpi_free(temp_divisor);
+
+ return 0;
+
+nomem:
+ mpi_free(temp_divisor);
+ return -ENOMEM;
+}
+
+/* If den == quot, den needs temporary storage.
+ * If den == rem, den needs temporary storage.
+ * If num == quot, num needs temporary storage.
+ * If den has temporary storage, it can be normalized while being copied,
+ * i.e no extra storage should be allocated.
+ */
+
+int mpi_tdiv_r(MPI rem, MPI num, MPI den)
+{
+ return mpi_tdiv_qr(NULL, rem, num, den);
+}
+
+int mpi_tdiv_qr(MPI quot, MPI rem, MPI num, MPI den)
+{
+ int rc = -ENOMEM;
+ mpi_ptr_t np, dp;
+ mpi_ptr_t qp, rp;
+ mpi_size_t nsize = num->nlimbs;
+ mpi_size_t dsize = den->nlimbs;
+ mpi_size_t qsize, rsize;
+ mpi_size_t sign_remainder = num->sign;
+ mpi_size_t sign_quotient = num->sign ^ den->sign;
+ unsigned normalization_steps;
+ mpi_limb_t q_limb;
+ mpi_ptr_t marker[5];
+ int markidx = 0;
+
+ memset(marker, 0, sizeof(marker));
+
+ /* Ensure space is enough for quotient and remainder.
+ * We need space for an extra limb in the remainder, because it's
+ * up-shifted (normalized) below. */
+ rsize = nsize + 1;
+ if (mpi_resize(rem, rsize) < 0)
+ goto nomem;
+
+ qsize = rsize - dsize; /* qsize cannot be bigger than this. */
+ if (qsize <= 0) {
+ if (num != rem) {
+ rem->nlimbs = num->nlimbs;
+ rem->sign = num->sign;
+ MPN_COPY(rem->d, num->d, nsize);
+ }
+ if (quot) {
+ /* This needs to follow the assignment to rem, in case the
+ * numerator and quotient are the same. */
+ quot->nlimbs = 0;
+ quot->sign = 0;
+ }
+ return 0;
+ }
+
+ if (quot)
+ if (mpi_resize(quot, qsize) < 0)
+ goto nomem;
+
+ /* Read pointers here, when reallocation is finished. */
+ np = num->d;
+ dp = den->d;
+ rp = rem->d;
+
+ /* Optimize division by a single-limb divisor. */
+ if (dsize == 1) {
+ mpi_limb_t rlimb;
+ if (quot) {
+ qp = quot->d;
+ rlimb = mpihelp_divmod_1(qp, np, nsize, dp[0]);
+ qsize -= qp[qsize - 1] == 0;
+ quot->nlimbs = qsize;
+ quot->sign = sign_quotient;
+ } else
+ rlimb = mpihelp_mod_1(np, nsize, dp[0]);
+ rp[0] = rlimb;
+ rsize = rlimb != 0 ? 1 : 0;
+ rem->nlimbs = rsize;
+ rem->sign = sign_remainder;
+ return 0;
+ }
+
+ if (quot) {
+ qp = quot->d;
+ /* Make sure QP and NP point to different objects. Otherwise the
+ * numerator would be gradually overwritten by the quotient limbs. */
+ if (qp == np) { /* Copy NP object to temporary space. */
+ np = marker[markidx++] = mpi_alloc_limb_space(nsize);
+ MPN_COPY(np, qp, nsize);
+ }
+ } else /* Put quotient at top of remainder. */
+ qp = rp + dsize;
+
+ count_leading_zeros(normalization_steps, dp[dsize - 1]);
+
+ /* Normalize the denominator, i.e. make its most significant bit set by
+ * shifting it NORMALIZATION_STEPS bits to the left. Also shift the
+ * numerator the same number of steps (to keep the quotient the same!).
+ */
+ if (normalization_steps) {
+ mpi_ptr_t tp;
+ mpi_limb_t nlimb;
+
+ /* Shift up the denominator setting the most significant bit of
+ * the most significant word. Use temporary storage not to clobber
+ * the original contents of the denominator. */
+ tp = marker[markidx++] = mpi_alloc_limb_space(dsize);
+ if (!tp)
+ goto nomem;
+ mpihelp_lshift(tp, dp, dsize, normalization_steps);
+ dp = tp;
+
+ /* Shift up the numerator, possibly introducing a new most
+ * significant word. Move the shifted numerator in the remainder
+ * meanwhile. */
+ nlimb = mpihelp_lshift(rp, np, nsize, normalization_steps);
+ if (nlimb) {
+ rp[nsize] = nlimb;
+ rsize = nsize + 1;
+ } else
+ rsize = nsize;
+ } else {
+ /* The denominator is already normalized, as required. Copy it to
+ * temporary space if it overlaps with the quotient or remainder. */
+ if (dp == rp || (quot && (dp == qp))) {
+ mpi_ptr_t tp;
+
+ tp = marker[markidx++] = mpi_alloc_limb_space(dsize);
+ if (!tp)
+ goto nomem;
+ MPN_COPY(tp, dp, dsize);
+ dp = tp;
+ }
+
+ /* Move the numerator to the remainder. */
+ if (rp != np)
+ MPN_COPY(rp, np, nsize);
+
+ rsize = nsize;
+ }
+
+ q_limb = mpihelp_divrem(qp, 0, rp, rsize, dp, dsize);
+
+ if (quot) {
+ qsize = rsize - dsize;
+ if (q_limb) {
+ qp[qsize] = q_limb;
+ qsize += 1;
+ }
+
+ quot->nlimbs = qsize;
+ quot->sign = sign_quotient;
+ }
+
+ rsize = dsize;
+ MPN_NORMALIZE(rp, rsize);
+
+ if (normalization_steps && rsize) {
+ mpihelp_rshift(rp, rp, rsize, normalization_steps);
+ rsize -= rp[rsize - 1] == 0 ? 1 : 0;
+ }
+
+ rem->nlimbs = rsize;
+ rem->sign = sign_remainder;
+
+ rc = 0;
+nomem:
+ while (markidx)
+ mpi_free_limb_space(marker[--markidx]);
+ return rc;
+}
+
+int mpi_tdiv_q_2exp(MPI w, MPI u, unsigned count)
+{
+ mpi_size_t usize, wsize;
+ mpi_size_t limb_cnt;
+
+ usize = u->nlimbs;
+ limb_cnt = count / BITS_PER_MPI_LIMB;
+ wsize = usize - limb_cnt;
+ if (limb_cnt >= usize)
+ w->nlimbs = 0;
+ else {
+ mpi_ptr_t wp;
+ mpi_ptr_t up;
+
+ if (RESIZE_IF_NEEDED(w, wsize) < 0)
+ return -ENOMEM;
+ wp = w->d;
+ up = u->d;
+
+ count %= BITS_PER_MPI_LIMB;
+ if (count) {
+ mpihelp_rshift(wp, up + limb_cnt, wsize, count);
+ wsize -= !wp[wsize - 1];
+ } else {
+ MPN_COPY_INCR(wp, up + limb_cnt, wsize);
+ }
+
+ w->nlimbs = wsize;
+ }
+ return 0;
+}
+
+/****************
+ * Check whether dividend is divisible by divisor
+ * (note: divisor must fit into a limb)
+ */
+int mpi_divisible_ui(MPI dividend, ulong divisor)
+{
+ return !mpihelp_mod_1(dividend->d, dividend->nlimbs, divisor);
+}
--- /dev/null
+/* mpi-gcd.c - MPI functions
+ * Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#include "mpi-internal.h"
+
+/****************
+ * Find the greatest common divisor G of A and B.
+ * Return: true if this 1, false in all other cases
+ */
+int mpi_gcd(MPI g, const MPI xa, const MPI xb)
+{
+ MPI a = NULL, b = NULL;
+
+ if (mpi_copy(&a, xa) < 0)
+ goto nomem;
+
+ if (mpi_copy(&b, xb) < 0)
+ goto nomem;
+
+ /* TAOCP Vol II, 4.5.2, Algorithm A */
+ a->sign = 0;
+ b->sign = 0;
+ while (mpi_cmp_ui(b, 0)) {
+ if (mpi_fdiv_r(g, a, b) < 0) /* g used as temorary variable */
+ goto nomem;
+ if (mpi_set(a, b) < 0)
+ goto nomem;
+ if (mpi_set(b, g) < 0)
+ goto nomem;
+ }
+ if (mpi_set(g, a) < 0)
+ goto nomem;
+
+ mpi_free(a);
+ mpi_free(b);
+ return !mpi_cmp_ui(g, 1);
+
+nomem:
+ mpi_free(a);
+ mpi_free(b);
+ return -ENOMEM;
+}
--- /dev/null
+/* mpi-inline.c
+ * Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+/* put the inline functions as real functions into the lib */
+#define G10_MPI_INLINE_DECL
+
+#include "mpi-internal.h"
+
+/* always include the header becuase it is only
+ * included by mpi-internal if __GCC__ is defined but we
+ * need it here in all cases and the above definition of
+ * of the macro allows us to do so
+ */
+#include "mpi-inline.h"
--- /dev/null
+/* mpi-inline.h - Internal to the Multi Precision Integers
+ * Copyright (C) 1994, 1996, 1998, 1999 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ *
+ * Note: This code is heavily based on the GNU MP Library.
+ * Actually it's the same code with only minor changes in the
+ * way the data is stored; this is to support the abstraction
+ * of an optional secure memory allocation which may be used
+ * to avoid revealing of sensitive data due to paging etc.
+ * The GNU MP Library itself is published under the LGPL;
+ * however I decided to publish this code under the plain GPL.
+ */
+
+#ifndef G10_MPI_INLINE_H
+#define G10_MPI_INLINE_H
+
+#ifndef G10_MPI_INLINE_DECL
+#define G10_MPI_INLINE_DECL extern inline
+#endif
+
+G10_MPI_INLINE_DECL mpi_limb_t
+mpihelp_add_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
+ mpi_size_t s1_size, mpi_limb_t s2_limb)
+{
+ mpi_limb_t x;
+
+ x = *s1_ptr++;
+ s2_limb += x;
+ *res_ptr++ = s2_limb;
+ if (s2_limb < x) { /* sum is less than the left operand: handle carry */
+ while (--s1_size) {
+ x = *s1_ptr++ + 1; /* add carry */
+ *res_ptr++ = x; /* and store */
+ if (x) /* not 0 (no overflow): we can stop */
+ goto leave;
+ }
+ return 1; /* return carry (size of s1 to small) */
+ }
+
+leave:
+ if (res_ptr != s1_ptr) { /* not the same variable */
+ mpi_size_t i; /* copy the rest */
+ for (i = 0; i < s1_size - 1; i++)
+ res_ptr[i] = s1_ptr[i];
+ }
+ return 0; /* no carry */
+}
+
+G10_MPI_INLINE_DECL mpi_limb_t
+mpihelp_add(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, mpi_size_t s1_size,
+ mpi_ptr_t s2_ptr, mpi_size_t s2_size)
+{
+ mpi_limb_t cy = 0;
+
+ if (s2_size)
+ cy = mpihelp_add_n(res_ptr, s1_ptr, s2_ptr, s2_size);
+
+ if (s1_size - s2_size)
+ cy = mpihelp_add_1(res_ptr + s2_size, s1_ptr + s2_size,
+ s1_size - s2_size, cy);
+ return cy;
+}
+
+G10_MPI_INLINE_DECL mpi_limb_t
+mpihelp_sub_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
+ mpi_size_t s1_size, mpi_limb_t s2_limb)
+{
+ mpi_limb_t x;
+
+ x = *s1_ptr++;
+ s2_limb = x - s2_limb;
+ *res_ptr++ = s2_limb;
+ if (s2_limb > x) {
+ while (--s1_size) {
+ x = *s1_ptr++;
+ *res_ptr++ = x - 1;
+ if (x)
+ goto leave;
+ }
+ return 1;
+ }
+
+leave:
+ if (res_ptr != s1_ptr) {
+ mpi_size_t i;
+ for (i = 0; i < s1_size - 1; i++)
+ res_ptr[i] = s1_ptr[i];
+ }
+ return 0;
+}
+
+G10_MPI_INLINE_DECL mpi_limb_t
+mpihelp_sub(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, mpi_size_t s1_size,
+ mpi_ptr_t s2_ptr, mpi_size_t s2_size)
+{
+ mpi_limb_t cy = 0;
+
+ if (s2_size)
+ cy = mpihelp_sub_n(res_ptr, s1_ptr, s2_ptr, s2_size);
+
+ if (s1_size - s2_size)
+ cy = mpihelp_sub_1(res_ptr + s2_size, s1_ptr + s2_size,
+ s1_size - s2_size, cy);
+ return cy;
+}
+
+#endif /*G10_MPI_INLINE_H */
--- /dev/null
+/* mpi-internal.h - Internal to the Multi Precision Integers
+ * Copyright (C) 1994, 1996 Free Software Foundation, Inc.
+ * Copyright (C) 1998, 2000 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ *
+ * Note: This code is heavily based on the GNU MP Library.
+ * Actually it's the same code with only minor changes in the
+ * way the data is stored; this is to support the abstraction
+ * of an optional secure memory allocation which may be used
+ * to avoid revealing of sensitive data due to paging etc.
+ * The GNU MP Library itself is published under the LGPL;
+ * however I decided to publish this code under the plain GPL.
+ */
+
+#ifndef G10_MPI_INTERNAL_H
+#define G10_MPI_INTERNAL_H
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/mpi.h>
+#include <linux/errno.h>
+
+#define log_debug printk
+#define log_bug printk
+
+#define assert(x) \
+ do { \
+ if (!x) \
+ log_bug("failed assertion\n"); \
+ } while (0);
+
+/* If KARATSUBA_THRESHOLD is not already defined, define it to a
+ * value which is good on most machines. */
+
+/* tested 4, 16, 32 and 64, where 16 gave the best performance when
+ * checking a 768 and a 1024 bit ElGamal signature.
+ * (wk 22.12.97) */
+#ifndef KARATSUBA_THRESHOLD
+#define KARATSUBA_THRESHOLD 16
+#endif
+
+/* The code can't handle KARATSUBA_THRESHOLD smaller than 2. */
+#if KARATSUBA_THRESHOLD < 2
+#undef KARATSUBA_THRESHOLD
+#define KARATSUBA_THRESHOLD 2
+#endif
+
+typedef mpi_limb_t *mpi_ptr_t; /* pointer to a limb */
+typedef int mpi_size_t; /* (must be a signed type) */
+
+#define ABS(x) (x >= 0 ? x : -x)
+#define MIN(l, o) ((l) < (o) ? (l) : (o))
+#define MAX(h, i) ((h) > (i) ? (h) : (i))
+
+static inline int RESIZE_IF_NEEDED(MPI a, unsigned b)
+{
+ if (a->alloced < b)
+ return mpi_resize(a, b);
+ return 0;
+}
+
+/* Copy N limbs from S to D. */
+#define MPN_COPY(d, s, n) \
+ do { \
+ mpi_size_t _i; \
+ for (_i = 0; _i < (n); _i++) \
+ (d)[_i] = (s)[_i]; \
+ } while (0)
+
+#define MPN_COPY_INCR(d, s, n) \
+ do { \
+ mpi_size_t _i; \
+ for (_i = 0; _i < (n); _i++) \
+ (d)[_i] = (d)[_i]; \
+ } while (0)
+
+#define MPN_COPY_DECR(d, s, n) \
+ do { \
+ mpi_size_t _i; \
+ for (_i = (n)-1; _i >= 0; _i--) \
+ (d)[_i] = (s)[_i]; \
+ } while (0)
+
+/* Zero N limbs at D */
+#define MPN_ZERO(d, n) \
+ do { \
+ int _i; \
+ for (_i = 0; _i < (n); _i++) \
+ (d)[_i] = 0; \
+ } while (0)
+
+#define MPN_NORMALIZE(d, n) \
+ do { \
+ while ((n) > 0) { \
+ if ((d)[(n)-1]) \
+ break; \
+ (n)--; \
+ } \
+ } while (0)
+
+#define MPN_NORMALIZE_NOT_ZERO(d, n) \
+ do { \
+ for (;;) { \
+ if ((d)[(n)-1]) \
+ break; \
+ (n)--; \
+ } \
+ } while (0)
+
+#define MPN_MUL_N_RECURSE(prodp, up, vp, size, tspace) \
+ do { \
+ if ((size) < KARATSUBA_THRESHOLD) \
+ mul_n_basecase(prodp, up, vp, size); \
+ else \
+ mul_n(prodp, up, vp, size, tspace); \
+ } while (0);
+
+/* Divide the two-limb number in (NH,,NL) by D, with DI being the largest
+ * limb not larger than (2**(2*BITS_PER_MP_LIMB))/D - (2**BITS_PER_MP_LIMB).
+ * If this would yield overflow, DI should be the largest possible number
+ * (i.e., only ones). For correct operation, the most significant bit of D
+ * has to be set. Put the quotient in Q and the remainder in R.
+ */
+#define UDIV_QRNND_PREINV(q, r, nh, nl, d, di) \
+ do { \
+ mpi_limb_t _q, _ql, _r; \
+ mpi_limb_t _xh, _xl; \
+ umul_ppmm(_q, _ql, (nh), (di)); \
+ _q += (nh); /* DI is 2**BITS_PER_MPI_LIMB too small */ \
+ umul_ppmm(_xh, _xl, _q, (d)); \
+ sub_ddmmss(_xh, _r, (nh), (nl), _xh, _xl); \
+ if (_xh) { \
+ sub_ddmmss(_xh, _r, _xh, _r, 0, (d)); \
+ _q++; \
+ if (_xh) { \
+ sub_ddmmss(_xh, _r, _xh, _r, 0, (d)); \
+ _q++; \
+ } \
+ } \
+ if (_r >= (d)) { \
+ _r -= (d); \
+ _q++; \
+ } \
+ (r) = _r; \
+ (q) = _q; \
+ } while (0)
+
+/*-- mpiutil.c --*/
+mpi_ptr_t mpi_alloc_limb_space(unsigned nlimbs);
+void mpi_free_limb_space(mpi_ptr_t a);
+void mpi_assign_limb_space(MPI a, mpi_ptr_t ap, unsigned nlimbs);
+
+/*-- mpi-bit.c --*/
+void mpi_rshift_limbs(MPI a, unsigned int count);
+int mpi_lshift_limbs(MPI a, unsigned int count);
+
+/*-- mpihelp-add.c --*/
+mpi_limb_t mpihelp_add_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
+ mpi_size_t s1_size, mpi_limb_t s2_limb);
+mpi_limb_t mpihelp_add_n(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
+ mpi_ptr_t s2_ptr, mpi_size_t size);
+mpi_limb_t mpihelp_add(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, mpi_size_t s1_size,
+ mpi_ptr_t s2_ptr, mpi_size_t s2_size);
+
+/*-- mpihelp-sub.c --*/
+mpi_limb_t mpihelp_sub_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
+ mpi_size_t s1_size, mpi_limb_t s2_limb);
+mpi_limb_t mpihelp_sub_n(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
+ mpi_ptr_t s2_ptr, mpi_size_t size);
+mpi_limb_t mpihelp_sub(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, mpi_size_t s1_size,
+ mpi_ptr_t s2_ptr, mpi_size_t s2_size);
+
+/*-- mpihelp-cmp.c --*/
+int mpihelp_cmp(mpi_ptr_t op1_ptr, mpi_ptr_t op2_ptr, mpi_size_t size);
+
+/*-- mpihelp-mul.c --*/
+
+struct karatsuba_ctx {
+ struct karatsuba_ctx *next;
+ mpi_ptr_t tspace;
+ mpi_size_t tspace_size;
+ mpi_ptr_t tp;
+ mpi_size_t tp_size;
+};
+
+void mpihelp_release_karatsuba_ctx(struct karatsuba_ctx *ctx);
+
+mpi_limb_t mpihelp_addmul_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
+ mpi_size_t s1_size, mpi_limb_t s2_limb);
+mpi_limb_t mpihelp_submul_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
+ mpi_size_t s1_size, mpi_limb_t s2_limb);
+int mpihelp_mul_n(mpi_ptr_t prodp, mpi_ptr_t up, mpi_ptr_t vp, mpi_size_t size);
+int mpihelp_mul(mpi_ptr_t prodp, mpi_ptr_t up, mpi_size_t usize,
+ mpi_ptr_t vp, mpi_size_t vsize, mpi_limb_t *_result);
+void mpih_sqr_n_basecase(mpi_ptr_t prodp, mpi_ptr_t up, mpi_size_t size);
+void mpih_sqr_n(mpi_ptr_t prodp, mpi_ptr_t up, mpi_size_t size,
+ mpi_ptr_t tspace);
+
+int mpihelp_mul_karatsuba_case(mpi_ptr_t prodp,
+ mpi_ptr_t up, mpi_size_t usize,
+ mpi_ptr_t vp, mpi_size_t vsize,
+ struct karatsuba_ctx *ctx);
+
+/*-- mpihelp-mul_1.c (or xxx/cpu/ *.S) --*/
+mpi_limb_t mpihelp_mul_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
+ mpi_size_t s1_size, mpi_limb_t s2_limb);
+
+/*-- mpihelp-div.c --*/
+mpi_limb_t mpihelp_mod_1(mpi_ptr_t dividend_ptr, mpi_size_t dividend_size,
+ mpi_limb_t divisor_limb);
+mpi_limb_t mpihelp_divrem(mpi_ptr_t qp, mpi_size_t qextra_limbs,
+ mpi_ptr_t np, mpi_size_t nsize,
+ mpi_ptr_t dp, mpi_size_t dsize);
+mpi_limb_t mpihelp_divmod_1(mpi_ptr_t quot_ptr,
+ mpi_ptr_t dividend_ptr, mpi_size_t dividend_size,
+ mpi_limb_t divisor_limb);
+
+/*-- mpihelp-shift.c --*/
+mpi_limb_t mpihelp_lshift(mpi_ptr_t wp, mpi_ptr_t up, mpi_size_t usize,
+ unsigned cnt);
+mpi_limb_t mpihelp_rshift(mpi_ptr_t wp, mpi_ptr_t up, mpi_size_t usize,
+ unsigned cnt);
+
+/* Define stuff for longlong.h. */
+#define W_TYPE_SIZE BITS_PER_MPI_LIMB
+typedef mpi_limb_t UWtype;
+typedef unsigned int UHWtype;
+#if defined(__GNUC__)
+typedef unsigned int UQItype __attribute__ ((mode(QI)));
+typedef int SItype __attribute__ ((mode(SI)));
+typedef unsigned int USItype __attribute__ ((mode(SI)));
+typedef int DItype __attribute__ ((mode(DI)));
+typedef unsigned int UDItype __attribute__ ((mode(DI)));
+#else
+typedef unsigned char UQItype;
+typedef long SItype;
+typedef unsigned long USItype;
+#endif
+
+#ifdef __GNUC__
+#include "mpi-inline.h"
+#endif
+
+#endif /*G10_MPI_INTERNAL_H */
--- /dev/null
+/* mpi-inv.c - MPI functions
+ * Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#include "mpi-internal.h"
+
+/****************
+ * Calculate the multiplicative inverse X of A mod N
+ * That is: Find the solution x for
+ * 1 = (a*x) mod n
+ */
+int mpi_invm(MPI x, const MPI a, const MPI n)
+{
+ /* Extended Euclid's algorithm (See TAOPC Vol II, 4.5.2, Alg X)
+ * modified according to Michael Penk's solution for Exercice 35
+ * with further enhancement */
+ MPI u = NULL, v = NULL;
+ MPI u1 = NULL, u2 = NULL, u3 = NULL;
+ MPI v1 = NULL, v2 = NULL, v3 = NULL;
+ MPI t1 = NULL, t2 = NULL, t3 = NULL;
+ unsigned k;
+ int sign;
+ int odd = 0;
+ int rc = -ENOMEM;
+
+ if (mpi_copy(&u, a) < 0)
+ goto cleanup;
+ if (mpi_copy(&v, n) < 0)
+ goto cleanup;
+
+ for (k = 0; !mpi_test_bit(u, 0) && !mpi_test_bit(v, 0); k++) {
+ if (mpi_rshift(u, u, 1) < 0)
+ goto cleanup;
+ if (mpi_rshift(v, v, 1) < 0)
+ goto cleanup;
+ }
+ odd = mpi_test_bit(v, 0);
+
+ u1 = mpi_alloc_set_ui(1);
+ if (!u1)
+ goto cleanup;
+ if (!odd) {
+ u2 = mpi_alloc_set_ui(0);
+ if (!u2)
+ goto cleanup;
+ }
+ if (mpi_copy(&u3, u) < 0)
+ goto cleanup;
+ if (mpi_copy(&v1, v) < 0)
+ goto cleanup;
+ if (!odd) {
+ v2 = mpi_alloc(mpi_get_nlimbs(u));
+ if (!v2)
+ goto cleanup;
+ if (mpi_sub(v2, u1, u) < 0)
+ goto cleanup; /* U is used as const 1 */
+ }
+ if (mpi_copy(&v3, v) < 0)
+ goto cleanup;
+ if (mpi_test_bit(u, 0)) { /* u is odd */
+ t1 = mpi_alloc_set_ui(0);
+ if (!t1)
+ goto cleanup;
+ if (!odd) {
+ t2 = mpi_alloc_set_ui(1);
+ if (!t2)
+ goto cleanup;
+ t2->sign = 1;
+ }
+ if (mpi_copy(&t3, v) < 0)
+ goto cleanup;
+ t3->sign = !t3->sign;
+ goto Y4;
+ } else {
+ t1 = mpi_alloc_set_ui(1);
+ if (!t1)
+ goto cleanup;
+ if (!odd) {
+ t2 = mpi_alloc_set_ui(0);
+ if (!t2)
+ goto cleanup;
+ }
+ if (mpi_copy(&t3, u) < 0)
+ goto cleanup;
+ }
+ do {
+ do {
+ if (!odd) {
+ if (mpi_test_bit(t1, 0) || mpi_test_bit(t2, 0)) { /* one is odd */
+ if (mpi_add(t1, t1, v) < 0)
+ goto cleanup;
+ if (mpi_sub(t2, t2, u) < 0)
+ goto cleanup;
+ }
+ if (mpi_rshift(t1, t1, 1) < 0)
+ goto cleanup;
+ if (mpi_rshift(t2, t2, 1) < 0)
+ goto cleanup;
+ if (mpi_rshift(t3, t3, 1) < 0)
+ goto cleanup;
+ } else {
+ if (mpi_test_bit(t1, 0))
+ if (mpi_add(t1, t1, v) < 0)
+ goto cleanup;
+ if (mpi_rshift(t1, t1, 1) < 0)
+ goto cleanup;
+ if (mpi_rshift(t3, t3, 1) < 0)
+ goto cleanup;
+ }
+Y4:
+ ;
+ } while (!mpi_test_bit(t3, 0)); /* while t3 is even */
+
+ if (!t3->sign) {
+ if (mpi_set(u1, t1) < 0)
+ goto cleanup;
+ if (!odd)
+ if (mpi_set(u2, t2) < 0)
+ goto cleanup;
+ if (mpi_set(u3, t3) < 0)
+ goto cleanup;
+ } else {
+ if (mpi_sub(v1, v, t1) < 0)
+ goto cleanup;
+ sign = u->sign;
+ u->sign = !u->sign;
+ if (!odd)
+ if (mpi_sub(v2, u, t2) < 0)
+ goto cleanup;
+ u->sign = sign;
+ sign = t3->sign;
+ t3->sign = !t3->sign;
+ if (mpi_set(v3, t3) < 0)
+ goto cleanup;
+ t3->sign = sign;
+ }
+ if (mpi_sub(t1, u1, v1) < 0)
+ goto cleanup;
+ if (!odd)
+ if (mpi_sub(t2, u2, v2) < 0)
+ goto cleanup;
+ if (mpi_sub(t3, u3, v3) < 0)
+ goto cleanup;
+ if (t1->sign) {
+ if (mpi_add(t1, t1, v) < 0)
+ goto cleanup;
+ if (!odd)
+ if (mpi_sub(t2, t2, u) < 0)
+ goto cleanup;
+ }
+ } while (mpi_cmp_ui(t3, 0)); /* while t3 != 0 */
+ /* mpi_lshift( u3, k ); */
+ rc = mpi_set(x, u1);
+
+cleanup:
+ mpi_free(u1);
+ mpi_free(v1);
+ mpi_free(t1);
+ if (!odd) {
+ mpi_free(u2);
+ mpi_free(v2);
+ mpi_free(t2);
+ }
+ mpi_free(u3);
+ mpi_free(v3);
+ mpi_free(t3);
+
+ mpi_free(u);
+ mpi_free(v);
+ return rc;
+}
--- /dev/null
+/* mpi-mpow.c - MPI functions
+ * Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#include "mpi-internal.h"
+#include "longlong.h"
+
+static int build_index(const MPI *exparray, int k, int i, int t)
+{
+ int j, bitno;
+ int index = 0;
+
+ bitno = t - i;
+ for (j = k - 1; j >= 0; j--) {
+ index <<= 1;
+ if (mpi_test_bit(exparray[j], bitno))
+ index |= 1;
+ }
+ return index;
+}
+
+/****************
+ * RES = (BASE[0] ^ EXP[0]) * (BASE[1] ^ EXP[1]) * ... * mod M
+ */
+int mpi_mulpowm(MPI res, MPI *basearray, MPI *exparray, MPI m)
+{
+ int rc = -ENOMEM;
+ int k; /* number of elements */
+ int t; /* bit size of largest exponent */
+ int i, j, idx;
+ MPI *G = NULL; /* table with precomputed values of size 2^k */
+ MPI tmp = NULL;
+
+ for (k = 0; basearray[k]; k++)
+ ;
+ if (!k) {
+ pr_emerg("mpi_mulpowm: assert(k) failed\n");
+ BUG();
+ }
+ for (t = 0, i = 0; (tmp = exparray[i]); i++) {
+ j = mpi_get_nbits(tmp);
+ if (j > t)
+ t = j;
+ }
+ if (i != k) {
+ pr_emerg("mpi_mulpowm: assert(i==k) failed\n");
+ BUG();
+ }
+ if (!t) {
+ pr_emerg("mpi_mulpowm: assert(t) failed\n");
+ BUG();
+ }
+ if (k >= 10) {
+ pr_emerg("mpi_mulpowm: assert(k<10) failed\n");
+ BUG();
+ }
+
+ G = kzalloc((1 << k) * sizeof *G, GFP_KERNEL);
+ if (!G)
+ goto err_out;
+
+ /* and calculate */
+ tmp = mpi_alloc(mpi_get_nlimbs(m) + 1);
+ if (!tmp)
+ goto nomem;
+ if (mpi_set_ui(res, 1) < 0)
+ goto nomem;
+ for (i = 1; i <= t; i++) {
+ if (mpi_mulm(tmp, res, res, m) < 0)
+ goto nomem;
+ idx = build_index(exparray, k, i, t);
+ if (!(idx >= 0 && idx < (1 << k))) {
+ pr_emerg("mpi_mulpowm: assert(idx >= 0 && idx < (1<<k)) failed\n");
+ BUG();
+ }
+ if (!G[idx]) {
+ if (!idx) {
+ G[0] = mpi_alloc_set_ui(1);
+ if (!G[0])
+ goto nomem;
+ } else {
+ for (j = 0; j < k; j++) {
+ if ((idx & (1 << j))) {
+ if (!G[idx]) {
+ if (mpi_copy
+ (&G[idx],
+ basearray[j]) < 0)
+ goto nomem;
+ } else {
+ if (mpi_mulm
+ (G[idx], G[idx],
+ basearray[j],
+ m) < 0)
+ goto nomem;
+ }
+ }
+ }
+ if (!G[idx]) {
+ G[idx] = mpi_alloc(0);
+ if (!G[idx])
+ goto nomem;
+ }
+ }
+ }
+ if (mpi_mulm(res, tmp, G[idx], m) < 0)
+ goto nomem;
+ }
+
+ rc = 0;
+nomem:
+ /* cleanup */
+ mpi_free(tmp);
+ for (i = 0; i < (1 << k); i++)
+ mpi_free(G[i]);
+ kfree(G);
+err_out:
+ return rc;
+}
--- /dev/null
+/* mpi-mul.c - MPI functions
+ * Copyright (C) 1994, 1996 Free Software Foundation, Inc.
+ * Copyright (C) 1998, 2001 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ *
+ * Note: This code is heavily based on the GNU MP Library.
+ * Actually it's the same code with only minor changes in the
+ * way the data is stored; this is to support the abstraction
+ * of an optional secure memory allocation which may be used
+ * to avoid revealing of sensitive data due to paging etc.
+ * The GNU MP Library itself is published under the LGPL;
+ * however I decided to publish this code under the plain GPL.
+ */
+
+#include "mpi-internal.h"
+
+int mpi_mul_ui(MPI prod, MPI mult, unsigned long small_mult)
+{
+ mpi_size_t size, prod_size;
+ mpi_ptr_t prod_ptr;
+ mpi_limb_t cy;
+ int sign;
+
+ size = mult->nlimbs;
+ sign = mult->sign;
+
+ if (!size || !small_mult) {
+ prod->nlimbs = 0;
+ prod->sign = 0;
+ return 0;
+ }
+
+ prod_size = size + 1;
+ if (prod->alloced < prod_size)
+ if (mpi_resize(prod, prod_size) < 0)
+ return -ENOMEM;
+ prod_ptr = prod->d;
+
+ cy = mpihelp_mul_1(prod_ptr, mult->d, size, (mpi_limb_t) small_mult);
+ if (cy)
+ prod_ptr[size++] = cy;
+ prod->nlimbs = size;
+ prod->sign = sign;
+ return 0;
+}
+
+int mpi_mul_2exp(MPI w, MPI u, unsigned long cnt)
+{
+ mpi_size_t usize, wsize, limb_cnt;
+ mpi_ptr_t wp;
+ mpi_limb_t wlimb;
+ int usign, wsign;
+
+ usize = u->nlimbs;
+ usign = u->sign;
+
+ if (!usize) {
+ w->nlimbs = 0;
+ w->sign = 0;
+ return 0;
+ }
+
+ limb_cnt = cnt / BITS_PER_MPI_LIMB;
+ wsize = usize + limb_cnt + 1;
+ if (w->alloced < wsize)
+ if (mpi_resize(w, wsize) < 0)
+ return -ENOMEM;
+ wp = w->d;
+ wsize = usize + limb_cnt;
+ wsign = usign;
+
+ cnt %= BITS_PER_MPI_LIMB;
+ if (cnt) {
+ wlimb = mpihelp_lshift(wp + limb_cnt, u->d, usize, cnt);
+ if (wlimb) {
+ wp[wsize] = wlimb;
+ wsize++;
+ }
+ } else {
+ MPN_COPY_DECR(wp + limb_cnt, u->d, usize);
+ }
+
+ /* Zero all whole limbs at low end. Do it here and not before calling
+ * mpn_lshift, not to lose for U == W. */
+ MPN_ZERO(wp, limb_cnt);
+
+ w->nlimbs = wsize;
+ w->sign = wsign;
+ return 0;
+}
+
+int mpi_mul(MPI w, MPI u, MPI v)
+{
+ int rc = -ENOMEM;
+ mpi_size_t usize, vsize, wsize;
+ mpi_ptr_t up, vp, wp;
+ mpi_limb_t cy;
+ int usign, vsign, sign_product;
+ int assign_wp = 0;
+ mpi_ptr_t tmp_limb = NULL;
+
+ if (u->nlimbs < v->nlimbs) { /* Swap U and V. */
+ usize = v->nlimbs;
+ usign = v->sign;
+ up = v->d;
+ vsize = u->nlimbs;
+ vsign = u->sign;
+ vp = u->d;
+ } else {
+ usize = u->nlimbs;
+ usign = u->sign;
+ up = u->d;
+ vsize = v->nlimbs;
+ vsign = v->sign;
+ vp = v->d;
+ }
+ sign_product = usign ^ vsign;
+ wp = w->d;
+
+ /* Ensure W has space enough to store the result. */
+ wsize = usize + vsize;
+ if (w->alloced < (size_t) wsize) {
+ if (wp == up || wp == vp) {
+ wp = mpi_alloc_limb_space(wsize);
+ if (!wp)
+ goto nomem;
+ assign_wp = 1;
+ } else {
+ if (mpi_resize(w, wsize) < 0)
+ goto nomem;
+ wp = w->d;
+ }
+ } else { /* Make U and V not overlap with W. */
+ if (wp == up) {
+ /* W and U are identical. Allocate temporary space for U. */
+ up = tmp_limb = mpi_alloc_limb_space(usize);
+ if (!up)
+ goto nomem;
+ /* Is V identical too? Keep it identical with U. */
+ if (wp == vp)
+ vp = up;
+ /* Copy to the temporary space. */
+ MPN_COPY(up, wp, usize);
+ } else if (wp == vp) {
+ /* W and V are identical. Allocate temporary space for V. */
+ vp = tmp_limb = mpi_alloc_limb_space(vsize);
+ if (!vp)
+ goto nomem;
+ /* Copy to the temporary space. */
+ MPN_COPY(vp, wp, vsize);
+ }
+ }
+
+ if (!vsize)
+ wsize = 0;
+ else {
+ if (mpihelp_mul(wp, up, usize, vp, vsize, &cy) < 0)
+ goto nomem;
+ wsize -= cy ? 0 : 1;
+ }
+
+ if (assign_wp)
+ mpi_assign_limb_space(w, wp, wsize);
+
+ w->nlimbs = wsize;
+ w->sign = sign_product;
+ rc = 0;
+nomem:
+ if (tmp_limb)
+ mpi_free_limb_space(tmp_limb);
+ return rc;
+}
+
+int mpi_mulm(MPI w, MPI u, MPI v, MPI m)
+{
+ if (mpi_mul(w, u, v) < 0)
+ return -ENOMEM;
+ return mpi_fdiv_r(w, w, m);
+}
--- /dev/null
+/* mpi-pow.c - MPI functions
+ * Copyright (C) 1994, 1996, 1998, 2000 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ *
+ * Note: This code is heavily based on the GNU MP Library.
+ * Actually it's the same code with only minor changes in the
+ * way the data is stored; this is to support the abstraction
+ * of an optional secure memory allocation which may be used
+ * to avoid revealing of sensitive data due to paging etc.
+ * The GNU MP Library itself is published under the LGPL;
+ * however I decided to publish this code under the plain GPL.
+ */
+
+#include <linux/string.h>
+#include "mpi-internal.h"
+#include "longlong.h"
+
+/****************
+ * RES = BASE ^ EXP mod MOD
+ */
+int mpi_powm(MPI res, MPI base, MPI exp, MPI mod)
+{
+ mpi_ptr_t mp_marker = NULL, bp_marker = NULL, ep_marker = NULL;
+ mpi_ptr_t xp_marker = NULL;
+ mpi_ptr_t tspace = NULL;
+ mpi_ptr_t rp, ep, mp, bp;
+ mpi_size_t esize, msize, bsize, rsize;
+ int esign, msign, bsign, rsign;
+ mpi_size_t size;
+ int mod_shift_cnt;
+ int negative_result;
+ int assign_rp = 0;
+ mpi_size_t tsize = 0; /* to avoid compiler warning */
+ /* fixme: we should check that the warning is void */
+ int rc = -ENOMEM;
+
+ esize = exp->nlimbs;
+ msize = mod->nlimbs;
+ size = 2 * msize;
+ esign = exp->sign;
+ msign = mod->sign;
+
+ rp = res->d;
+ ep = exp->d;
+
+ if (!msize)
+ msize = 1 / msize; /* provoke a signal */
+
+ if (!esize) {
+ /* Exponent is zero, result is 1 mod MOD, i.e., 1 or 0
+ * depending on if MOD equals 1. */
+ rp[0] = 1;
+ res->nlimbs = (msize == 1 && mod->d[0] == 1) ? 0 : 1;
+ res->sign = 0;
+ goto leave;
+ }
+
+ /* Normalize MOD (i.e. make its most significant bit set) as required by
+ * mpn_divrem. This will make the intermediate values in the calculation
+ * slightly larger, but the correct result is obtained after a final
+ * reduction using the original MOD value. */
+ mp = mp_marker = mpi_alloc_limb_space(msize);
+ if (!mp)
+ goto enomem;
+ count_leading_zeros(mod_shift_cnt, mod->d[msize - 1]);
+ if (mod_shift_cnt)
+ mpihelp_lshift(mp, mod->d, msize, mod_shift_cnt);
+ else
+ MPN_COPY(mp, mod->d, msize);
+
+ bsize = base->nlimbs;
+ bsign = base->sign;
+ if (bsize > msize) { /* The base is larger than the module. Reduce it. */
+ /* Allocate (BSIZE + 1) with space for remainder and quotient.
+ * (The quotient is (bsize - msize + 1) limbs.) */
+ bp = bp_marker = mpi_alloc_limb_space(bsize + 1);
+ if (!bp)
+ goto enomem;
+ MPN_COPY(bp, base->d, bsize);
+ /* We don't care about the quotient, store it above the remainder,
+ * at BP + MSIZE. */
+ mpihelp_divrem(bp + msize, 0, bp, bsize, mp, msize);
+ bsize = msize;
+ /* Canonicalize the base, since we are going to multiply with it
+ * quite a few times. */
+ MPN_NORMALIZE(bp, bsize);
+ } else
+ bp = base->d;
+
+ if (!bsize) {
+ res->nlimbs = 0;
+ res->sign = 0;
+ goto leave;
+ }
+
+ if (res->alloced < size) {
+ /* We have to allocate more space for RES. If any of the input
+ * parameters are identical to RES, defer deallocation of the old
+ * space. */
+ if (rp == ep || rp == mp || rp == bp) {
+ rp = mpi_alloc_limb_space(size);
+ if (!rp)
+ goto enomem;
+ assign_rp = 1;
+ } else {
+ if (mpi_resize(res, size) < 0)
+ goto enomem;
+ rp = res->d;
+ }
+ } else { /* Make BASE, EXP and MOD not overlap with RES. */
+ if (rp == bp) {
+ /* RES and BASE are identical. Allocate temp. space for BASE. */
+ BUG_ON(bp_marker);
+ bp = bp_marker = mpi_alloc_limb_space(bsize);
+ if (!bp)
+ goto enomem;
+ MPN_COPY(bp, rp, bsize);
+ }
+ if (rp == ep) {
+ /* RES and EXP are identical. Allocate temp. space for EXP. */
+ ep = ep_marker = mpi_alloc_limb_space(esize);
+ if (!ep)
+ goto enomem;
+ MPN_COPY(ep, rp, esize);
+ }
+ if (rp == mp) {
+ /* RES and MOD are identical. Allocate temporary space for MOD. */
+ BUG_ON(mp_marker);
+ mp = mp_marker = mpi_alloc_limb_space(msize);
+ if (!mp)
+ goto enomem;
+ MPN_COPY(mp, rp, msize);
+ }
+ }
+
+ MPN_COPY(rp, bp, bsize);
+ rsize = bsize;
+ rsign = bsign;
+
+ {
+ mpi_size_t i;
+ mpi_ptr_t xp;
+ int c;
+ mpi_limb_t e;
+ mpi_limb_t carry_limb;
+ struct karatsuba_ctx karactx;
+
+ xp = xp_marker = mpi_alloc_limb_space(2 * (msize + 1));
+ if (!xp)
+ goto enomem;
+
+ memset(&karactx, 0, sizeof karactx);
+ negative_result = (ep[0] & 1) && base->sign;
+
+ i = esize - 1;
+ e = ep[i];
+ count_leading_zeros(c, e);
+ e = (e << c) << 1; /* shift the exp bits to the left, lose msb */
+ c = BITS_PER_MPI_LIMB - 1 - c;
+
+ /* Main loop.
+ *
+ * Make the result be pointed to alternately by XP and RP. This
+ * helps us avoid block copying, which would otherwise be necessary
+ * with the overlap restrictions of mpihelp_divmod. With 50% probability
+ * the result after this loop will be in the area originally pointed
+ * by RP (==RES->d), and with 50% probability in the area originally
+ * pointed to by XP.
+ */
+
+ for (;;) {
+ while (c) {
+ mpi_ptr_t tp;
+ mpi_size_t xsize;
+
+ /*if (mpihelp_mul_n(xp, rp, rp, rsize) < 0) goto enomem */
+ if (rsize < KARATSUBA_THRESHOLD)
+ mpih_sqr_n_basecase(xp, rp, rsize);
+ else {
+ if (!tspace) {
+ tsize = 2 * rsize;
+ tspace =
+ mpi_alloc_limb_space(tsize);
+ if (!tspace)
+ goto enomem;
+ } else if (tsize < (2 * rsize)) {
+ mpi_free_limb_space(tspace);
+ tsize = 2 * rsize;
+ tspace =
+ mpi_alloc_limb_space(tsize);
+ if (!tspace)
+ goto enomem;
+ }
+ mpih_sqr_n(xp, rp, rsize, tspace);
+ }
+
+ xsize = 2 * rsize;
+ if (xsize > msize) {
+ mpihelp_divrem(xp + msize, 0, xp, xsize,
+ mp, msize);
+ xsize = msize;
+ }
+
+ tp = rp;
+ rp = xp;
+ xp = tp;
+ rsize = xsize;
+
+ if ((mpi_limb_signed_t) e < 0) {
+ /*mpihelp_mul( xp, rp, rsize, bp, bsize ); */
+ if (bsize < KARATSUBA_THRESHOLD) {
+ mpi_limb_t tmp;
+ if (mpihelp_mul
+ (xp, rp, rsize, bp, bsize,
+ &tmp) < 0)
+ goto enomem;
+ } else {
+ if (mpihelp_mul_karatsuba_case
+ (xp, rp, rsize, bp, bsize,
+ &karactx) < 0)
+ goto enomem;
+ }
+
+ xsize = rsize + bsize;
+ if (xsize > msize) {
+ mpihelp_divrem(xp + msize, 0,
+ xp, xsize, mp,
+ msize);
+ xsize = msize;
+ }
+
+ tp = rp;
+ rp = xp;
+ xp = tp;
+ rsize = xsize;
+ }
+ e <<= 1;
+ c--;
+ }
+
+ i--;
+ if (i < 0)
+ break;
+ e = ep[i];
+ c = BITS_PER_MPI_LIMB;
+ }
+
+ /* We shifted MOD, the modulo reduction argument, left MOD_SHIFT_CNT
+ * steps. Adjust the result by reducing it with the original MOD.
+ *
+ * Also make sure the result is put in RES->d (where it already
+ * might be, see above).
+ */
+ if (mod_shift_cnt) {
+ carry_limb =
+ mpihelp_lshift(res->d, rp, rsize, mod_shift_cnt);
+ rp = res->d;
+ if (carry_limb) {
+ rp[rsize] = carry_limb;
+ rsize++;
+ }
+ } else {
+ MPN_COPY(res->d, rp, rsize);
+ rp = res->d;
+ }
+
+ if (rsize >= msize) {
+ mpihelp_divrem(rp + msize, 0, rp, rsize, mp, msize);
+ rsize = msize;
+ }
+
+ /* Remove any leading zero words from the result. */
+ if (mod_shift_cnt)
+ mpihelp_rshift(rp, rp, rsize, mod_shift_cnt);
+ MPN_NORMALIZE(rp, rsize);
+
+ mpihelp_release_karatsuba_ctx(&karactx);
+ }
+
+ if (negative_result && rsize) {
+ if (mod_shift_cnt)
+ mpihelp_rshift(mp, mp, msize, mod_shift_cnt);
+ mpihelp_sub(rp, mp, msize, rp, rsize);
+ rsize = msize;
+ rsign = msign;
+ MPN_NORMALIZE(rp, rsize);
+ }
+ res->nlimbs = rsize;
+ res->sign = rsign;
+
+leave:
+ rc = 0;
+enomem:
+ if (assign_rp)
+ mpi_assign_limb_space(res, rp, size);
+ if (mp_marker)
+ mpi_free_limb_space(mp_marker);
+ if (bp_marker)
+ mpi_free_limb_space(bp_marker);
+ if (ep_marker)
+ mpi_free_limb_space(ep_marker);
+ if (xp_marker)
+ mpi_free_limb_space(xp_marker);
+ if (tspace)
+ mpi_free_limb_space(tspace);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(mpi_powm);
--- /dev/null
+/* mpi-scan.c - MPI functions
+ * Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#include "mpi-internal.h"
+#include "longlong.h"
+
+/****************
+ * Scan through an mpi and return byte for byte. a -1 is returned to indicate
+ * the end of the mpi. Scanning is done from the lsb to the msb, returned
+ * values are in the range of 0 .. 255.
+ *
+ * FIXME: This code is VERY ugly!
+ */
+int mpi_getbyte(const MPI a, unsigned idx)
+{
+ int i, j;
+ unsigned n;
+ mpi_ptr_t ap;
+ mpi_limb_t limb;
+
+ ap = a->d;
+ for (n = 0, i = 0; i < a->nlimbs; i++) {
+ limb = ap[i];
+ for (j = 0; j < BYTES_PER_MPI_LIMB; j++, n++)
+ if (n == idx)
+ return (limb >> j * 8) & 0xff;
+ }
+ return -1;
+}
+
+/****************
+ * Put a value at position IDX into A. idx counts from lsb to msb
+ */
+void mpi_putbyte(MPI a, unsigned idx, int xc)
+{
+ int i, j;
+ unsigned n;
+ mpi_ptr_t ap;
+ mpi_limb_t limb, c;
+
+ c = xc & 0xff;
+ ap = a->d;
+ for (n = 0, i = 0; i < a->alloced; i++) {
+ limb = ap[i];
+ for (j = 0; j < BYTES_PER_MPI_LIMB; j++, n++)
+ if (n == idx) {
+#if BYTES_PER_MPI_LIMB == 4
+ if (j == 0)
+ limb = (limb & 0xffffff00) | c;
+ else if (j == 1)
+ limb = (limb & 0xffff00ff) | (c << 8);
+ else if (j == 2)
+ limb = (limb & 0xff00ffff) | (c << 16);
+ else
+ limb = (limb & 0x00ffffff) | (c << 24);
+#elif BYTES_PER_MPI_LIMB == 8
+ if (j == 0)
+ limb = (limb & 0xffffffffffffff00) | c;
+ else if (j == 1)
+ limb =
+ (limb & 0xffffffffffff00ff) | (c <<
+ 8);
+ else if (j == 2)
+ limb =
+ (limb & 0xffffffffff00ffff) | (c <<
+ 16);
+ else if (j == 3)
+ limb =
+ (limb & 0xffffffff00ffffff) | (c <<
+ 24);
+ else if (j == 4)
+ limb =
+ (limb & 0xffffff00ffffffff) | (c <<
+ 32);
+ else if (j == 5)
+ limb =
+ (limb & 0xffff00ffffffffff) | (c <<
+ 40);
+ else if (j == 6)
+ limb =
+ (limb & 0xff00ffffffffffff) | (c <<
+ 48);
+ else
+ limb =
+ (limb & 0x00ffffffffffffff) | (c <<
+ 56);
+#else
+#error please enhance this function, its ugly - i know.
+#endif
+ if (a->nlimbs <= i)
+ a->nlimbs = i + 1;
+ ap[i] = limb;
+ return;
+ }
+ }
+ log_bug("index out of range\n");
+}
+
+/****************
+ * Count the number of zerobits at the low end of A
+ */
+unsigned mpi_trailing_zeros(const MPI a)
+{
+ unsigned n, count = 0;
+
+ for (n = 0; n < a->nlimbs; n++) {
+ if (a->d[n]) {
+ unsigned nn;
+ mpi_limb_t alimb = a->d[n];
+
+ count_trailing_zeros(nn, alimb);
+ count += nn;
+ break;
+ }
+ count += BITS_PER_MPI_LIMB;
+ }
+ return count;
+
+}
--- /dev/null
+/* mpicoder.c - Coder for the external representation of MPIs
+ * Copyright (C) 1998, 1999 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#include "mpi-internal.h"
+
+#define DIM(v) (sizeof(v)/sizeof((v)[0]))
+#define MAX_EXTERN_MPI_BITS 16384
+
+static uint8_t asn[15] = /* Object ID is 1.3.14.3.2.26 */
+{ 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b, 0x0e, 0x03,
+ 0x02, 0x1a, 0x05, 0x00, 0x04, 0x14
+};
+
+MPI do_encode_md(const void *sha_buffer, unsigned nbits)
+{
+ int nframe = (nbits + 7) / 8;
+ uint8_t *frame, *fr_pt;
+ int i = 0, n;
+ size_t asnlen = DIM(asn);
+ MPI a = MPI_NULL;
+
+ if (SHA1_DIGEST_LENGTH + asnlen + 4 > nframe)
+ pr_info("MPI: can't encode a %d bit MD into a %d bits frame\n",
+ (int)(SHA1_DIGEST_LENGTH * 8), (int)nbits);
+
+ /* We encode the MD in this way:
+ *
+ * 0 A PAD(n bytes) 0 ASN(asnlen bytes) MD(len bytes)
+ *
+ * PAD consists of FF bytes.
+ */
+ frame = kmalloc(nframe, GFP_KERNEL);
+ if (!frame)
+ return MPI_NULL;
+ n = 0;
+ frame[n++] = 0;
+ frame[n++] = 1; /* block type */
+ i = nframe - SHA1_DIGEST_LENGTH - asnlen - 3;
+
+ if (i <= 1) {
+ pr_info("MPI: message digest encoding failed\n");
+ kfree(frame);
+ return a;
+ }
+
+ memset(frame + n, 0xff, i);
+ n += i;
+ frame[n++] = 0;
+ memcpy(frame + n, &asn, asnlen);
+ n += asnlen;
+ memcpy(frame + n, sha_buffer, SHA1_DIGEST_LENGTH);
+ n += SHA1_DIGEST_LENGTH;
+
+ i = nframe;
+ fr_pt = frame;
+
+ if (n != nframe) {
+ printk
+ ("MPI: message digest encoding failed, frame length is wrong\n");
+ kfree(frame);
+ return a;
+ }
+
+ a = mpi_alloc((nframe + BYTES_PER_MPI_LIMB - 1) / BYTES_PER_MPI_LIMB);
+ mpi_set_buffer(a, frame, nframe, 0);
+ kfree(frame);
+
+ return a;
+}
+
+MPI mpi_read_from_buffer(const void *xbuffer, unsigned *ret_nread)
+{
+ const uint8_t *buffer = xbuffer;
+ int i, j;
+ unsigned nbits, nbytes, nlimbs, nread = 0;
+ mpi_limb_t a;
+ MPI val = MPI_NULL;
+
+ if (*ret_nread < 2)
+ goto leave;
+ nbits = buffer[0] << 8 | buffer[1];
+
+ if (nbits > MAX_EXTERN_MPI_BITS) {
+ pr_info("MPI: mpi too large (%u bits)\n", nbits);
+ goto leave;
+ }
+ buffer += 2;
+ nread = 2;
+
+ nbytes = (nbits + 7) / 8;
+ nlimbs = (nbytes + BYTES_PER_MPI_LIMB - 1) / BYTES_PER_MPI_LIMB;
+ val = mpi_alloc(nlimbs);
+ if (!val)
+ return MPI_NULL;
+ i = BYTES_PER_MPI_LIMB - nbytes % BYTES_PER_MPI_LIMB;
+ i %= BYTES_PER_MPI_LIMB;
+ val->nbits = nbits;
+ j = val->nlimbs = nlimbs;
+ val->sign = 0;
+ for (; j > 0; j--) {
+ a = 0;
+ for (; i < BYTES_PER_MPI_LIMB; i++) {
+ if (++nread > *ret_nread) {
+ printk
+ ("MPI: mpi larger than buffer nread=%d ret_nread=%d\n",
+ nread, *ret_nread);
+ goto leave;
+ }
+ a <<= 8;
+ a |= *buffer++;
+ }
+ i = 0;
+ val->d[j - 1] = a;
+ }
+
+leave:
+ *ret_nread = nread;
+ return val;
+}
+EXPORT_SYMBOL_GPL(mpi_read_from_buffer);
+
+/****************
+ * Make an mpi from a character string.
+ */
+int mpi_fromstr(MPI val, const char *str)
+{
+ int hexmode = 0, sign = 0, prepend_zero = 0, i, j, c, c1, c2;
+ unsigned nbits, nbytes, nlimbs;
+ mpi_limb_t a;
+
+ if (*str == '-') {
+ sign = 1;
+ str++;
+ }
+ if (*str == '0' && str[1] == 'x')
+ hexmode = 1;
+ else
+ return -EINVAL; /* other bases are not yet supported */
+ str += 2;
+
+ nbits = strlen(str) * 4;
+ if (nbits % 8)
+ prepend_zero = 1;
+ nbytes = (nbits + 7) / 8;
+ nlimbs = (nbytes + BYTES_PER_MPI_LIMB - 1) / BYTES_PER_MPI_LIMB;
+ if (val->alloced < nlimbs)
+ if (!mpi_resize(val, nlimbs))
+ return -ENOMEM;
+ i = BYTES_PER_MPI_LIMB - nbytes % BYTES_PER_MPI_LIMB;
+ i %= BYTES_PER_MPI_LIMB;
+ j = val->nlimbs = nlimbs;
+ val->sign = sign;
+ for (; j > 0; j--) {
+ a = 0;
+ for (; i < BYTES_PER_MPI_LIMB; i++) {
+ if (prepend_zero) {
+ c1 = '0';
+ prepend_zero = 0;
+ } else
+ c1 = *str++;
+ assert(c1);
+ c2 = *str++;
+ assert(c2);
+ if (c1 >= '0' && c1 <= '9')
+ c = c1 - '0';
+ else if (c1 >= 'a' && c1 <= 'f')
+ c = c1 - 'a' + 10;
+ else if (c1 >= 'A' && c1 <= 'F')
+ c = c1 - 'A' + 10;
+ else {
+ mpi_clear(val);
+ return 1;
+ }
+ c <<= 4;
+ if (c2 >= '0' && c2 <= '9')
+ c |= c2 - '0';
+ else if (c2 >= 'a' && c2 <= 'f')
+ c |= c2 - 'a' + 10;
+ else if (c2 >= 'A' && c2 <= 'F')
+ c |= c2 - 'A' + 10;
+ else {
+ mpi_clear(val);
+ return 1;
+ }
+ a <<= 8;
+ a |= c;
+ }
+ i = 0;
+
+ val->d[j - 1] = a;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(mpi_fromstr);
+
+/****************
+ * Special function to get the low 8 bytes from an mpi.
+ * This can be used as a keyid; KEYID is an 2 element array.
+ * Return the low 4 bytes.
+ */
+u32 mpi_get_keyid(const MPI a, u32 *keyid)
+{
+#if BYTES_PER_MPI_LIMB == 4
+ if (keyid) {
+ keyid[0] = a->nlimbs >= 2 ? a->d[1] : 0;
+ keyid[1] = a->nlimbs >= 1 ? a->d[0] : 0;
+ }
+ return a->nlimbs >= 1 ? a->d[0] : 0;
+#elif BYTES_PER_MPI_LIMB == 8
+ if (keyid) {
+ keyid[0] = a->nlimbs ? (u32) (a->d[0] >> 32) : 0;
+ keyid[1] = a->nlimbs ? (u32) (a->d[0] & 0xffffffff) : 0;
+ }
+ return a->nlimbs ? (u32) (a->d[0] & 0xffffffff) : 0;
+#else
+#error Make this function work with other LIMB sizes
+#endif
+}
+
+/****************
+ * Return an allocated buffer with the MPI (msb first).
+ * NBYTES receives the length of this buffer. Caller must free the
+ * return string (This function does return a 0 byte buffer with NBYTES
+ * set to zero if the value of A is zero. If sign is not NULL, it will
+ * be set to the sign of the A.
+ */
+void *mpi_get_buffer(MPI a, unsigned *nbytes, int *sign)
+{
+ uint8_t *p, *buffer;
+ mpi_limb_t alimb;
+ int i;
+ unsigned int n;
+
+ if (sign)
+ *sign = a->sign;
+ *nbytes = n = a->nlimbs * BYTES_PER_MPI_LIMB;
+ if (!n)
+ n++; /* avoid zero length allocation */
+ p = buffer = kmalloc(n, GFP_KERNEL);
+
+ for (i = a->nlimbs - 1; i >= 0; i--) {
+ alimb = a->d[i];
+#if BYTES_PER_MPI_LIMB == 4
+ *p++ = alimb >> 24;
+ *p++ = alimb >> 16;
+ *p++ = alimb >> 8;
+ *p++ = alimb;
+#elif BYTES_PER_MPI_LIMB == 8
+ *p++ = alimb >> 56;
+ *p++ = alimb >> 48;
+ *p++ = alimb >> 40;
+ *p++ = alimb >> 32;
+ *p++ = alimb >> 24;
+ *p++ = alimb >> 16;
+ *p++ = alimb >> 8;
+ *p++ = alimb;
+#else
+#error please implement for this limb size.
+#endif
+ }
+
+ /* this is sub-optimal but we need to do the shift operation
+ * because the caller has to free the returned buffer */
+ for (p = buffer; !*p && *nbytes; p++, --*nbytes)
+ ;
+ if (p != buffer)
+ memmove(buffer, p, *nbytes);
+
+ return buffer;
+}
+EXPORT_SYMBOL_GPL(mpi_get_buffer);
+
+/****************
+ * Use BUFFER to update MPI.
+ */
+int mpi_set_buffer(MPI a, const void *xbuffer, unsigned nbytes, int sign)
+{
+ const uint8_t *buffer = xbuffer, *p;
+ mpi_limb_t alimb;
+ int nlimbs;
+ int i;
+
+ nlimbs = (nbytes + BYTES_PER_MPI_LIMB - 1) / BYTES_PER_MPI_LIMB;
+ if (RESIZE_IF_NEEDED(a, nlimbs) < 0)
+ return -ENOMEM;
+ a->sign = sign;
+
+ for (i = 0, p = buffer + nbytes - 1; p >= buffer + BYTES_PER_MPI_LIMB;) {
+#if BYTES_PER_MPI_LIMB == 4
+ alimb = (mpi_limb_t) *p--;
+ alimb |= (mpi_limb_t) *p-- << 8;
+ alimb |= (mpi_limb_t) *p-- << 16;
+ alimb |= (mpi_limb_t) *p-- << 24;
+#elif BYTES_PER_MPI_LIMB == 8
+ alimb = (mpi_limb_t) *p--;
+ alimb |= (mpi_limb_t) *p-- << 8;
+ alimb |= (mpi_limb_t) *p-- << 16;
+ alimb |= (mpi_limb_t) *p-- << 24;
+ alimb |= (mpi_limb_t) *p-- << 32;
+ alimb |= (mpi_limb_t) *p-- << 40;
+ alimb |= (mpi_limb_t) *p-- << 48;
+ alimb |= (mpi_limb_t) *p-- << 56;
+#else
+#error please implement for this limb size.
+#endif
+ a->d[i++] = alimb;
+ }
+ if (p >= buffer) {
+#if BYTES_PER_MPI_LIMB == 4
+ alimb = *p--;
+ if (p >= buffer)
+ alimb |= (mpi_limb_t) *p-- << 8;
+ if (p >= buffer)
+ alimb |= (mpi_limb_t) *p-- << 16;
+ if (p >= buffer)
+ alimb |= (mpi_limb_t) *p-- << 24;
+#elif BYTES_PER_MPI_LIMB == 8
+ alimb = (mpi_limb_t) *p--;
+ if (p >= buffer)
+ alimb |= (mpi_limb_t) *p-- << 8;
+ if (p >= buffer)
+ alimb |= (mpi_limb_t) *p-- << 16;
+ if (p >= buffer)
+ alimb |= (mpi_limb_t) *p-- << 24;
+ if (p >= buffer)
+ alimb |= (mpi_limb_t) *p-- << 32;
+ if (p >= buffer)
+ alimb |= (mpi_limb_t) *p-- << 40;
+ if (p >= buffer)
+ alimb |= (mpi_limb_t) *p-- << 48;
+ if (p >= buffer)
+ alimb |= (mpi_limb_t) *p-- << 56;
+#else
+#error please implement for this limb size.
+#endif
+ a->d[i++] = alimb;
+ }
+ a->nlimbs = i;
+
+ if (i != nlimbs) {
+ pr_emerg("MPI: mpi_set_buffer: Assertion failed (%d != %d)", i,
+ nlimbs);
+ BUG();
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(mpi_set_buffer);
--- /dev/null
+/* mpihelp-sub.c - MPI helper functions
+ * Copyright (C) 1994, 1996 Free Software Foundation, Inc.
+ * Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ *
+ * Note: This code is heavily based on the GNU MP Library.
+ * Actually it's the same code with only minor changes in the
+ * way the data is stored; this is to support the abstraction
+ * of an optional secure memory allocation which may be used
+ * to avoid revealing of sensitive data due to paging etc.
+ * The GNU MP Library itself is published under the LGPL;
+ * however I decided to publish this code under the plain GPL.
+ */
+
+#include "mpi-internal.h"
+
+/****************
+ * Compare OP1_PTR/OP1_SIZE with OP2_PTR/OP2_SIZE.
+ * There are no restrictions on the relative sizes of
+ * the two arguments.
+ * Return 1 if OP1 > OP2, 0 if they are equal, and -1 if OP1 < OP2.
+ */
+int mpihelp_cmp(mpi_ptr_t op1_ptr, mpi_ptr_t op2_ptr, mpi_size_t size)
+{
+ mpi_size_t i;
+ mpi_limb_t op1_word, op2_word;
+
+ for (i = size - 1; i >= 0; i--) {
+ op1_word = op1_ptr[i];
+ op2_word = op2_ptr[i];
+ if (op1_word != op2_word)
+ goto diff;
+ }
+ return 0;
+
+diff:
+ /* This can *not* be simplified to
+ * op2_word - op2_word
+ * since that expression might give signed overflow. */
+ return (op1_word > op2_word) ? 1 : -1;
+}
--- /dev/null
+/* mpihelp-div.c - MPI helper functions
+ * Copyright (C) 1994, 1996 Free Software Foundation, Inc.
+ * Copyright (C) 1998, 1999 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ *
+ * Note: This code is heavily based on the GNU MP Library.
+ * Actually it's the same code with only minor changes in the
+ * way the data is stored; this is to support the abstraction
+ * of an optional secure memory allocation which may be used
+ * to avoid revealing of sensitive data due to paging etc.
+ * The GNU MP Library itself is published under the LGPL;
+ * however I decided to publish this code under the plain GPL.
+ */
+
+#include "mpi-internal.h"
+#include "longlong.h"
+
+#ifndef UMUL_TIME
+#define UMUL_TIME 1
+#endif
+#ifndef UDIV_TIME
+#define UDIV_TIME UMUL_TIME
+#endif
+
+/* FIXME: We should be using invert_limb (or invert_normalized_limb)
+ * here (not udiv_qrnnd).
+ */
+
+mpi_limb_t
+mpihelp_mod_1(mpi_ptr_t dividend_ptr, mpi_size_t dividend_size,
+ mpi_limb_t divisor_limb)
+{
+ mpi_size_t i;
+ mpi_limb_t n1, n0, r;
+ int dummy;
+
+ /* Botch: Should this be handled at all? Rely on callers? */
+ if (!dividend_size)
+ return 0;
+
+ /* If multiplication is much faster than division, and the
+ * dividend is large, pre-invert the divisor, and use
+ * only multiplications in the inner loop.
+ *
+ * This test should be read:
+ * Does it ever help to use udiv_qrnnd_preinv?
+ * && Does what we save compensate for the inversion overhead?
+ */
+ if (UDIV_TIME > (2 * UMUL_TIME + 6)
+ && (UDIV_TIME - (2 * UMUL_TIME + 6)) * dividend_size > UDIV_TIME) {
+ int normalization_steps;
+
+ count_leading_zeros(normalization_steps, divisor_limb);
+ if (normalization_steps) {
+ mpi_limb_t divisor_limb_inverted;
+
+ divisor_limb <<= normalization_steps;
+
+ /* Compute (2**2N - 2**N * DIVISOR_LIMB) / DIVISOR_LIMB. The
+ * result is a (N+1)-bit approximation to 1/DIVISOR_LIMB, with the
+ * most significant bit (with weight 2**N) implicit.
+ *
+ * Special case for DIVISOR_LIMB == 100...000.
+ */
+ if (!(divisor_limb << 1))
+ divisor_limb_inverted = ~(mpi_limb_t) 0;
+ else
+ udiv_qrnnd(divisor_limb_inverted, dummy,
+ -divisor_limb, 0, divisor_limb);
+
+ n1 = dividend_ptr[dividend_size - 1];
+ r = n1 >> (BITS_PER_MPI_LIMB - normalization_steps);
+
+ /* Possible optimization:
+ * if (r == 0
+ * && divisor_limb > ((n1 << normalization_steps)
+ * | (dividend_ptr[dividend_size - 2] >> ...)))
+ * ...one division less...
+ */
+ for (i = dividend_size - 2; i >= 0; i--) {
+ n0 = dividend_ptr[i];
+ UDIV_QRNND_PREINV(dummy, r, r,
+ ((n1 << normalization_steps)
+ | (n0 >>
+ (BITS_PER_MPI_LIMB -
+ normalization_steps))),
+ divisor_limb,
+ divisor_limb_inverted);
+ n1 = n0;
+ }
+ UDIV_QRNND_PREINV(dummy, r, r,
+ n1 << normalization_steps,
+ divisor_limb, divisor_limb_inverted);
+ return r >> normalization_steps;
+ } else {
+ mpi_limb_t divisor_limb_inverted;
+
+ /* Compute (2**2N - 2**N * DIVISOR_LIMB) / DIVISOR_LIMB. The
+ * result is a (N+1)-bit approximation to 1/DIVISOR_LIMB, with the
+ * most significant bit (with weight 2**N) implicit.
+ *
+ * Special case for DIVISOR_LIMB == 100...000.
+ */
+ if (!(divisor_limb << 1))
+ divisor_limb_inverted = ~(mpi_limb_t) 0;
+ else
+ udiv_qrnnd(divisor_limb_inverted, dummy,
+ -divisor_limb, 0, divisor_limb);
+
+ i = dividend_size - 1;
+ r = dividend_ptr[i];
+
+ if (r >= divisor_limb)
+ r = 0;
+ else
+ i--;
+
+ for (; i >= 0; i--) {
+ n0 = dividend_ptr[i];
+ UDIV_QRNND_PREINV(dummy, r, r,
+ n0, divisor_limb,
+ divisor_limb_inverted);
+ }
+ return r;
+ }
+ } else {
+ if (UDIV_NEEDS_NORMALIZATION) {
+ int normalization_steps;
+
+ count_leading_zeros(normalization_steps, divisor_limb);
+ if (normalization_steps) {
+ divisor_limb <<= normalization_steps;
+
+ n1 = dividend_ptr[dividend_size - 1];
+ r = n1 >> (BITS_PER_MPI_LIMB -
+ normalization_steps);
+
+ /* Possible optimization:
+ * if (r == 0
+ * && divisor_limb > ((n1 << normalization_steps)
+ * | (dividend_ptr[dividend_size - 2] >> ...)))
+ * ...one division less...
+ */
+ for (i = dividend_size - 2; i >= 0; i--) {
+ n0 = dividend_ptr[i];
+ udiv_qrnnd(dummy, r, r,
+ ((n1 << normalization_steps)
+ | (n0 >>
+ (BITS_PER_MPI_LIMB -
+ normalization_steps))),
+ divisor_limb);
+ n1 = n0;
+ }
+ udiv_qrnnd(dummy, r, r,
+ n1 << normalization_steps,
+ divisor_limb);
+ return r >> normalization_steps;
+ }
+ }
+ /* No normalization needed, either because udiv_qrnnd doesn't require
+ * it, or because DIVISOR_LIMB is already normalized. */
+ i = dividend_size - 1;
+ r = dividend_ptr[i];
+
+ if (r >= divisor_limb)
+ r = 0;
+ else
+ i--;
+
+ for (; i >= 0; i--) {
+ n0 = dividend_ptr[i];
+ udiv_qrnnd(dummy, r, r, n0, divisor_limb);
+ }
+ return r;
+ }
+}
+
+/* Divide num (NP/NSIZE) by den (DP/DSIZE) and write
+ * the NSIZE-DSIZE least significant quotient limbs at QP
+ * and the DSIZE long remainder at NP. If QEXTRA_LIMBS is
+ * non-zero, generate that many fraction bits and append them after the
+ * other quotient limbs.
+ * Return the most significant limb of the quotient, this is always 0 or 1.
+ *
+ * Preconditions:
+ * 0. NSIZE >= DSIZE.
+ * 1. The most significant bit of the divisor must be set.
+ * 2. QP must either not overlap with the input operands at all, or
+ * QP + DSIZE >= NP must hold true. (This means that it's
+ * possible to put the quotient in the high part of NUM, right after the
+ * remainder in NUM.
+ * 3. NSIZE >= DSIZE, even if QEXTRA_LIMBS is non-zero.
+ */
+
+mpi_limb_t
+mpihelp_divrem(mpi_ptr_t qp, mpi_size_t qextra_limbs,
+ mpi_ptr_t np, mpi_size_t nsize, mpi_ptr_t dp, mpi_size_t dsize)
+{
+ mpi_limb_t most_significant_q_limb = 0;
+
+ switch (dsize) {
+ case 0:
+ /* We are asked to divide by zero, so go ahead and do it! (To make
+ the compiler not remove this statement, return the value.) */
+ return 1 / dsize;
+
+ case 1:
+ {
+ mpi_size_t i;
+ mpi_limb_t n1;
+ mpi_limb_t d;
+
+ d = dp[0];
+ n1 = np[nsize - 1];
+
+ if (n1 >= d) {
+ n1 -= d;
+ most_significant_q_limb = 1;
+ }
+
+ qp += qextra_limbs;
+ for (i = nsize - 2; i >= 0; i--)
+ udiv_qrnnd(qp[i], n1, n1, np[i], d);
+ qp -= qextra_limbs;
+
+ for (i = qextra_limbs - 1; i >= 0; i--)
+ udiv_qrnnd(qp[i], n1, n1, 0, d);
+
+ np[0] = n1;
+ }
+ break;
+
+ case 2:
+ {
+ mpi_size_t i;
+ mpi_limb_t n1, n0, n2;
+ mpi_limb_t d1, d0;
+
+ np += nsize - 2;
+ d1 = dp[1];
+ d0 = dp[0];
+ n1 = np[1];
+ n0 = np[0];
+
+ if (n1 >= d1 && (n1 > d1 || n0 >= d0)) {
+ sub_ddmmss(n1, n0, n1, n0, d1, d0);
+ most_significant_q_limb = 1;
+ }
+
+ for (i = qextra_limbs + nsize - 2 - 1; i >= 0; i--) {
+ mpi_limb_t q;
+ mpi_limb_t r;
+
+ if (i >= qextra_limbs)
+ np--;
+ else
+ np[0] = 0;
+
+ if (n1 == d1) {
+ /* Q should be either 111..111 or 111..110. Need special
+ * treatment of this rare case as normal division would
+ * give overflow. */
+ q = ~(mpi_limb_t) 0;
+
+ r = n0 + d1;
+ if (r < d1) { /* Carry in the addition? */
+ add_ssaaaa(n1, n0, r - d0,
+ np[0], 0, d0);
+ qp[i] = q;
+ continue;
+ }
+ n1 = d0 - (d0 != 0 ? 1 : 0);
+ n0 = -d0;
+ } else {
+ udiv_qrnnd(q, r, n1, n0, d1);
+ umul_ppmm(n1, n0, d0, q);
+ }
+
+ n2 = np[0];
+q_test:
+ if (n1 > r || (n1 == r && n0 > n2)) {
+ /* The estimated Q was too large. */
+ q--;
+ sub_ddmmss(n1, n0, n1, n0, 0, d0);
+ r += d1;
+ if (r >= d1) /* If not carry, test Q again. */
+ goto q_test;
+ }
+
+ qp[i] = q;
+ sub_ddmmss(n1, n0, r, n2, n1, n0);
+ }
+ np[1] = n1;
+ np[0] = n0;
+ }
+ break;
+
+ default:
+ {
+ mpi_size_t i;
+ mpi_limb_t dX, d1, n0;
+
+ np += nsize - dsize;
+ dX = dp[dsize - 1];
+ d1 = dp[dsize - 2];
+ n0 = np[dsize - 1];
+
+ if (n0 >= dX) {
+ if (n0 > dX
+ || mpihelp_cmp(np, dp, dsize - 1) >= 0) {
+ mpihelp_sub_n(np, np, dp, dsize);
+ n0 = np[dsize - 1];
+ most_significant_q_limb = 1;
+ }
+ }
+
+ for (i = qextra_limbs + nsize - dsize - 1; i >= 0; i--) {
+ mpi_limb_t q;
+ mpi_limb_t n1, n2;
+ mpi_limb_t cy_limb;
+
+ if (i >= qextra_limbs) {
+ np--;
+ n2 = np[dsize];
+ } else {
+ n2 = np[dsize - 1];
+ MPN_COPY_DECR(np + 1, np, dsize - 1);
+ np[0] = 0;
+ }
+
+ if (n0 == dX) {
+ /* This might over-estimate q, but it's probably not worth
+ * the extra code here to find out. */
+ q = ~(mpi_limb_t) 0;
+ } else {
+ mpi_limb_t r;
+
+ udiv_qrnnd(q, r, n0, np[dsize - 1], dX);
+ umul_ppmm(n1, n0, d1, q);
+
+ while (n1 > r
+ || (n1 == r
+ && n0 > np[dsize - 2])) {
+ q--;
+ r += dX;
+ if (r < dX) /* I.e. "carry in previous addition?" */
+ break;
+ n1 -= n0 < d1;
+ n0 -= d1;
+ }
+ }
+
+ /* Possible optimization: We already have (q * n0) and (1 * n1)
+ * after the calculation of q. Taking advantage of that, we
+ * could make this loop make two iterations less. */
+ cy_limb = mpihelp_submul_1(np, dp, dsize, q);
+
+ if (n2 != cy_limb) {
+ mpihelp_add_n(np, np, dp, dsize);
+ q--;
+ }
+
+ qp[i] = q;
+ n0 = np[dsize - 1];
+ }
+ }
+ }
+
+ return most_significant_q_limb;
+}
+
+/****************
+ * Divide (DIVIDEND_PTR,,DIVIDEND_SIZE) by DIVISOR_LIMB.
+ * Write DIVIDEND_SIZE limbs of quotient at QUOT_PTR.
+ * Return the single-limb remainder.
+ * There are no constraints on the value of the divisor.
+ *
+ * QUOT_PTR and DIVIDEND_PTR might point to the same limb.
+ */
+
+mpi_limb_t
+mpihelp_divmod_1(mpi_ptr_t quot_ptr,
+ mpi_ptr_t dividend_ptr, mpi_size_t dividend_size,
+ mpi_limb_t divisor_limb)
+{
+ mpi_size_t i;
+ mpi_limb_t n1, n0, r;
+ int dummy;
+
+ if (!dividend_size)
+ return 0;
+
+ /* If multiplication is much faster than division, and the
+ * dividend is large, pre-invert the divisor, and use
+ * only multiplications in the inner loop.
+ *
+ * This test should be read:
+ * Does it ever help to use udiv_qrnnd_preinv?
+ * && Does what we save compensate for the inversion overhead?
+ */
+ if (UDIV_TIME > (2 * UMUL_TIME + 6)
+ && (UDIV_TIME - (2 * UMUL_TIME + 6)) * dividend_size > UDIV_TIME) {
+ int normalization_steps;
+
+ count_leading_zeros(normalization_steps, divisor_limb);
+ if (normalization_steps) {
+ mpi_limb_t divisor_limb_inverted;
+
+ divisor_limb <<= normalization_steps;
+
+ /* Compute (2**2N - 2**N * DIVISOR_LIMB) / DIVISOR_LIMB. The
+ * result is a (N+1)-bit approximation to 1/DIVISOR_LIMB, with the
+ * most significant bit (with weight 2**N) implicit.
+ */
+ /* Special case for DIVISOR_LIMB == 100...000. */
+ if (!(divisor_limb << 1))
+ divisor_limb_inverted = ~(mpi_limb_t) 0;
+ else
+ udiv_qrnnd(divisor_limb_inverted, dummy,
+ -divisor_limb, 0, divisor_limb);
+
+ n1 = dividend_ptr[dividend_size - 1];
+ r = n1 >> (BITS_PER_MPI_LIMB - normalization_steps);
+
+ /* Possible optimization:
+ * if (r == 0
+ * && divisor_limb > ((n1 << normalization_steps)
+ * | (dividend_ptr[dividend_size - 2] >> ...)))
+ * ...one division less...
+ */
+ for (i = dividend_size - 2; i >= 0; i--) {
+ n0 = dividend_ptr[i];
+ UDIV_QRNND_PREINV(quot_ptr[i + 1], r, r,
+ ((n1 << normalization_steps)
+ | (n0 >>
+ (BITS_PER_MPI_LIMB -
+ normalization_steps))),
+ divisor_limb,
+ divisor_limb_inverted);
+ n1 = n0;
+ }
+ UDIV_QRNND_PREINV(quot_ptr[0], r, r,
+ n1 << normalization_steps,
+ divisor_limb, divisor_limb_inverted);
+ return r >> normalization_steps;
+ } else {
+ mpi_limb_t divisor_limb_inverted;
+
+ /* Compute (2**2N - 2**N * DIVISOR_LIMB) / DIVISOR_LIMB. The
+ * result is a (N+1)-bit approximation to 1/DIVISOR_LIMB, with the
+ * most significant bit (with weight 2**N) implicit.
+ */
+ /* Special case for DIVISOR_LIMB == 100...000. */
+ if (!(divisor_limb << 1))
+ divisor_limb_inverted = ~(mpi_limb_t) 0;
+ else
+ udiv_qrnnd(divisor_limb_inverted, dummy,
+ -divisor_limb, 0, divisor_limb);
+
+ i = dividend_size - 1;
+ r = dividend_ptr[i];
+
+ if (r >= divisor_limb)
+ r = 0;
+ else
+ quot_ptr[i--] = 0;
+
+ for (; i >= 0; i--) {
+ n0 = dividend_ptr[i];
+ UDIV_QRNND_PREINV(quot_ptr[i], r, r,
+ n0, divisor_limb,
+ divisor_limb_inverted);
+ }
+ return r;
+ }
+ } else {
+ if (UDIV_NEEDS_NORMALIZATION) {
+ int normalization_steps;
+
+ count_leading_zeros(normalization_steps, divisor_limb);
+ if (normalization_steps) {
+ divisor_limb <<= normalization_steps;
+
+ n1 = dividend_ptr[dividend_size - 1];
+ r = n1 >> (BITS_PER_MPI_LIMB -
+ normalization_steps);
+
+ /* Possible optimization:
+ * if (r == 0
+ * && divisor_limb > ((n1 << normalization_steps)
+ * | (dividend_ptr[dividend_size - 2] >> ...)))
+ * ...one division less...
+ */
+ for (i = dividend_size - 2; i >= 0; i--) {
+ n0 = dividend_ptr[i];
+ udiv_qrnnd(quot_ptr[i + 1], r, r,
+ ((n1 << normalization_steps)
+ | (n0 >>
+ (BITS_PER_MPI_LIMB -
+ normalization_steps))),
+ divisor_limb);
+ n1 = n0;
+ }
+ udiv_qrnnd(quot_ptr[0], r, r,
+ n1 << normalization_steps,
+ divisor_limb);
+ return r >> normalization_steps;
+ }
+ }
+ /* No normalization needed, either because udiv_qrnnd doesn't require
+ * it, or because DIVISOR_LIMB is already normalized. */
+ i = dividend_size - 1;
+ r = dividend_ptr[i];
+
+ if (r >= divisor_limb)
+ r = 0;
+ else
+ quot_ptr[i--] = 0;
+
+ for (; i >= 0; i--) {
+ n0 = dividend_ptr[i];
+ udiv_qrnnd(quot_ptr[i], r, r, n0, divisor_limb);
+ }
+ return r;
+ }
+}
--- /dev/null
+/* mpihelp-mul.c - MPI helper functions
+ * Copyright (C) 1994, 1996, 1998, 1999,
+ * 2000 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ *
+ * Note: This code is heavily based on the GNU MP Library.
+ * Actually it's the same code with only minor changes in the
+ * way the data is stored; this is to support the abstraction
+ * of an optional secure memory allocation which may be used
+ * to avoid revealing of sensitive data due to paging etc.
+ * The GNU MP Library itself is published under the LGPL;
+ * however I decided to publish this code under the plain GPL.
+ */
+
+#include <linux/string.h>
+#include "mpi-internal.h"
+#include "longlong.h"
+
+#define MPN_MUL_N_RECURSE(prodp, up, vp, size, tspace) \
+ do { \
+ if ((size) < KARATSUBA_THRESHOLD) \
+ mul_n_basecase(prodp, up, vp, size); \
+ else \
+ mul_n(prodp, up, vp, size, tspace); \
+ } while (0);
+
+#define MPN_SQR_N_RECURSE(prodp, up, size, tspace) \
+ do { \
+ if ((size) < KARATSUBA_THRESHOLD) \
+ mpih_sqr_n_basecase(prodp, up, size); \
+ else \
+ mpih_sqr_n(prodp, up, size, tspace); \
+ } while (0);
+
+/* Multiply the natural numbers u (pointed to by UP) and v (pointed to by VP),
+ * both with SIZE limbs, and store the result at PRODP. 2 * SIZE limbs are
+ * always stored. Return the most significant limb.
+ *
+ * Argument constraints:
+ * 1. PRODP != UP and PRODP != VP, i.e. the destination
+ * must be distinct from the multiplier and the multiplicand.
+ *
+ *
+ * Handle simple cases with traditional multiplication.
+ *
+ * This is the most critical code of multiplication. All multiplies rely
+ * on this, both small and huge. Small ones arrive here immediately. Huge
+ * ones arrive here as this is the base case for Karatsuba's recursive
+ * algorithm below.
+ */
+
+static mpi_limb_t
+mul_n_basecase(mpi_ptr_t prodp, mpi_ptr_t up, mpi_ptr_t vp, mpi_size_t size)
+{
+ mpi_size_t i;
+ mpi_limb_t cy;
+ mpi_limb_t v_limb;
+
+ /* Multiply by the first limb in V separately, as the result can be
+ * stored (not added) to PROD. We also avoid a loop for zeroing. */
+ v_limb = vp[0];
+ if (v_limb <= 1) {
+ if (v_limb == 1)
+ MPN_COPY(prodp, up, size);
+ else
+ MPN_ZERO(prodp, size);
+ cy = 0;
+ } else
+ cy = mpihelp_mul_1(prodp, up, size, v_limb);
+
+ prodp[size] = cy;
+ prodp++;
+
+ /* For each iteration in the outer loop, multiply one limb from
+ * U with one limb from V, and add it to PROD. */
+ for (i = 1; i < size; i++) {
+ v_limb = vp[i];
+ if (v_limb <= 1) {
+ cy = 0;
+ if (v_limb == 1)
+ cy = mpihelp_add_n(prodp, prodp, up, size);
+ } else
+ cy = mpihelp_addmul_1(prodp, up, size, v_limb);
+
+ prodp[size] = cy;
+ prodp++;
+ }
+
+ return cy;
+}
+
+static void
+mul_n(mpi_ptr_t prodp, mpi_ptr_t up, mpi_ptr_t vp,
+ mpi_size_t size, mpi_ptr_t tspace)
+{
+ if (size & 1) {
+ /* The size is odd, and the code below doesn't handle that.
+ * Multiply the least significant (size - 1) limbs with a recursive
+ * call, and handle the most significant limb of S1 and S2
+ * separately.
+ * A slightly faster way to do this would be to make the Karatsuba
+ * code below behave as if the size were even, and let it check for
+ * odd size in the end. I.e., in essence move this code to the end.
+ * Doing so would save us a recursive call, and potentially make the
+ * stack grow a lot less.
+ */
+ mpi_size_t esize = size - 1; /* even size */
+ mpi_limb_t cy_limb;
+
+ MPN_MUL_N_RECURSE(prodp, up, vp, esize, tspace);
+ cy_limb = mpihelp_addmul_1(prodp + esize, up, esize, vp[esize]);
+ prodp[esize + esize] = cy_limb;
+ cy_limb = mpihelp_addmul_1(prodp + esize, vp, size, up[esize]);
+ prodp[esize + size] = cy_limb;
+ } else {
+ /* Anatolij Alekseevich Karatsuba's divide-and-conquer algorithm.
+ *
+ * Split U in two pieces, U1 and U0, such that
+ * U = U0 + U1*(B**n),
+ * and V in V1 and V0, such that
+ * V = V0 + V1*(B**n).
+ *
+ * UV is then computed recursively using the identity
+ *
+ * 2n n n n
+ * UV = (B + B )U V + B (U -U )(V -V ) + (B + 1)U V
+ * 1 1 1 0 0 1 0 0
+ *
+ * Where B = 2**BITS_PER_MP_LIMB.
+ */
+ mpi_size_t hsize = size >> 1;
+ mpi_limb_t cy;
+ int negflg;
+
+ /* Product H. ________________ ________________
+ * |_____U1 x V1____||____U0 x V0_____|
+ * Put result in upper part of PROD and pass low part of TSPACE
+ * as new TSPACE.
+ */
+ MPN_MUL_N_RECURSE(prodp + size, up + hsize, vp + hsize, hsize,
+ tspace);
+
+ /* Product M. ________________
+ * |_(U1-U0)(V0-V1)_|
+ */
+ if (mpihelp_cmp(up + hsize, up, hsize) >= 0) {
+ mpihelp_sub_n(prodp, up + hsize, up, hsize);
+ negflg = 0;
+ } else {
+ mpihelp_sub_n(prodp, up, up + hsize, hsize);
+ negflg = 1;
+ }
+ if (mpihelp_cmp(vp + hsize, vp, hsize) >= 0) {
+ mpihelp_sub_n(prodp + hsize, vp + hsize, vp, hsize);
+ negflg ^= 1;
+ } else {
+ mpihelp_sub_n(prodp + hsize, vp, vp + hsize, hsize);
+ /* No change of NEGFLG. */
+ }
+ /* Read temporary operands from low part of PROD.
+ * Put result in low part of TSPACE using upper part of TSPACE
+ * as new TSPACE.
+ */
+ MPN_MUL_N_RECURSE(tspace, prodp, prodp + hsize, hsize,
+ tspace + size);
+
+ /* Add/copy product H. */
+ MPN_COPY(prodp + hsize, prodp + size, hsize);
+ cy = mpihelp_add_n(prodp + size, prodp + size,
+ prodp + size + hsize, hsize);
+
+ /* Add product M (if NEGFLG M is a negative number) */
+ if (negflg)
+ cy -=
+ mpihelp_sub_n(prodp + hsize, prodp + hsize, tspace,
+ size);
+ else
+ cy +=
+ mpihelp_add_n(prodp + hsize, prodp + hsize, tspace,
+ size);
+
+ /* Product L. ________________ ________________
+ * |________________||____U0 x V0_____|
+ * Read temporary operands from low part of PROD.
+ * Put result in low part of TSPACE using upper part of TSPACE
+ * as new TSPACE.
+ */
+ MPN_MUL_N_RECURSE(tspace, up, vp, hsize, tspace + size);
+
+ /* Add/copy Product L (twice) */
+
+ cy += mpihelp_add_n(prodp + hsize, prodp + hsize, tspace, size);
+ if (cy)
+ mpihelp_add_1(prodp + hsize + size,
+ prodp + hsize + size, hsize, cy);
+
+ MPN_COPY(prodp, tspace, hsize);
+ cy = mpihelp_add_n(prodp + hsize, prodp + hsize, tspace + hsize,
+ hsize);
+ if (cy)
+ mpihelp_add_1(prodp + size, prodp + size, size, 1);
+ }
+}
+
+void mpih_sqr_n_basecase(mpi_ptr_t prodp, mpi_ptr_t up, mpi_size_t size)
+{
+ mpi_size_t i;
+ mpi_limb_t cy_limb;
+ mpi_limb_t v_limb;
+
+ /* Multiply by the first limb in V separately, as the result can be
+ * stored (not added) to PROD. We also avoid a loop for zeroing. */
+ v_limb = up[0];
+ if (v_limb <= 1) {
+ if (v_limb == 1)
+ MPN_COPY(prodp, up, size);
+ else
+ MPN_ZERO(prodp, size);
+ cy_limb = 0;
+ } else
+ cy_limb = mpihelp_mul_1(prodp, up, size, v_limb);
+
+ prodp[size] = cy_limb;
+ prodp++;
+
+ /* For each iteration in the outer loop, multiply one limb from
+ * U with one limb from V, and add it to PROD. */
+ for (i = 1; i < size; i++) {
+ v_limb = up[i];
+ if (v_limb <= 1) {
+ cy_limb = 0;
+ if (v_limb == 1)
+ cy_limb = mpihelp_add_n(prodp, prodp, up, size);
+ } else
+ cy_limb = mpihelp_addmul_1(prodp, up, size, v_limb);
+
+ prodp[size] = cy_limb;
+ prodp++;
+ }
+}
+
+void
+mpih_sqr_n(mpi_ptr_t prodp, mpi_ptr_t up, mpi_size_t size, mpi_ptr_t tspace)
+{
+ if (size & 1) {
+ /* The size is odd, and the code below doesn't handle that.
+ * Multiply the least significant (size - 1) limbs with a recursive
+ * call, and handle the most significant limb of S1 and S2
+ * separately.
+ * A slightly faster way to do this would be to make the Karatsuba
+ * code below behave as if the size were even, and let it check for
+ * odd size in the end. I.e., in essence move this code to the end.
+ * Doing so would save us a recursive call, and potentially make the
+ * stack grow a lot less.
+ */
+ mpi_size_t esize = size - 1; /* even size */
+ mpi_limb_t cy_limb;
+
+ MPN_SQR_N_RECURSE(prodp, up, esize, tspace);
+ cy_limb = mpihelp_addmul_1(prodp + esize, up, esize, up[esize]);
+ prodp[esize + esize] = cy_limb;
+ cy_limb = mpihelp_addmul_1(prodp + esize, up, size, up[esize]);
+
+ prodp[esize + size] = cy_limb;
+ } else {
+ mpi_size_t hsize = size >> 1;
+ mpi_limb_t cy;
+
+ /* Product H. ________________ ________________
+ * |_____U1 x U1____||____U0 x U0_____|
+ * Put result in upper part of PROD and pass low part of TSPACE
+ * as new TSPACE.
+ */
+ MPN_SQR_N_RECURSE(prodp + size, up + hsize, hsize, tspace);
+
+ /* Product M. ________________
+ * |_(U1-U0)(U0-U1)_|
+ */
+ if (mpihelp_cmp(up + hsize, up, hsize) >= 0)
+ mpihelp_sub_n(prodp, up + hsize, up, hsize);
+ else
+ mpihelp_sub_n(prodp, up, up + hsize, hsize);
+
+ /* Read temporary operands from low part of PROD.
+ * Put result in low part of TSPACE using upper part of TSPACE
+ * as new TSPACE. */
+ MPN_SQR_N_RECURSE(tspace, prodp, hsize, tspace + size);
+
+ /* Add/copy product H */
+ MPN_COPY(prodp + hsize, prodp + size, hsize);
+ cy = mpihelp_add_n(prodp + size, prodp + size,
+ prodp + size + hsize, hsize);
+
+ /* Add product M (if NEGFLG M is a negative number). */
+ cy -= mpihelp_sub_n(prodp + hsize, prodp + hsize, tspace, size);
+
+ /* Product L. ________________ ________________
+ * |________________||____U0 x U0_____|
+ * Read temporary operands from low part of PROD.
+ * Put result in low part of TSPACE using upper part of TSPACE
+ * as new TSPACE. */
+ MPN_SQR_N_RECURSE(tspace, up, hsize, tspace + size);
+
+ /* Add/copy Product L (twice). */
+ cy += mpihelp_add_n(prodp + hsize, prodp + hsize, tspace, size);
+ if (cy)
+ mpihelp_add_1(prodp + hsize + size,
+ prodp + hsize + size, hsize, cy);
+
+ MPN_COPY(prodp, tspace, hsize);
+ cy = mpihelp_add_n(prodp + hsize, prodp + hsize, tspace + hsize,
+ hsize);
+ if (cy)
+ mpihelp_add_1(prodp + size, prodp + size, size, 1);
+ }
+}
+
+/* This should be made into an inline function in gmp.h. */
+int mpihelp_mul_n(mpi_ptr_t prodp, mpi_ptr_t up, mpi_ptr_t vp, mpi_size_t size)
+{
+ if (up == vp) {
+ if (size < KARATSUBA_THRESHOLD)
+ mpih_sqr_n_basecase(prodp, up, size);
+ else {
+ mpi_ptr_t tspace;
+ tspace = mpi_alloc_limb_space(2 * size);
+ if (!tspace)
+ return -ENOMEM;
+ mpih_sqr_n(prodp, up, size, tspace);
+ mpi_free_limb_space(tspace);
+ }
+ } else {
+ if (size < KARATSUBA_THRESHOLD)
+ mul_n_basecase(prodp, up, vp, size);
+ else {
+ mpi_ptr_t tspace;
+ tspace = mpi_alloc_limb_space(2 * size);
+ if (!tspace)
+ return -ENOMEM;
+ mul_n(prodp, up, vp, size, tspace);
+ mpi_free_limb_space(tspace);
+ }
+ }
+
+ return 0;
+}
+
+int
+mpihelp_mul_karatsuba_case(mpi_ptr_t prodp,
+ mpi_ptr_t up, mpi_size_t usize,
+ mpi_ptr_t vp, mpi_size_t vsize,
+ struct karatsuba_ctx *ctx)
+{
+ mpi_limb_t cy;
+
+ if (!ctx->tspace || ctx->tspace_size < vsize) {
+ if (ctx->tspace)
+ mpi_free_limb_space(ctx->tspace);
+ ctx->tspace = mpi_alloc_limb_space(2 * vsize);
+ if (!ctx->tspace)
+ return -ENOMEM;
+ ctx->tspace_size = vsize;
+ }
+
+ MPN_MUL_N_RECURSE(prodp, up, vp, vsize, ctx->tspace);
+
+ prodp += vsize;
+ up += vsize;
+ usize -= vsize;
+ if (usize >= vsize) {
+ if (!ctx->tp || ctx->tp_size < vsize) {
+ if (ctx->tp)
+ mpi_free_limb_space(ctx->tp);
+ ctx->tp = mpi_alloc_limb_space(2 * vsize);
+ if (!ctx->tp) {
+ if (ctx->tspace)
+ mpi_free_limb_space(ctx->tspace);
+ ctx->tspace = NULL;
+ return -ENOMEM;
+ }
+ ctx->tp_size = vsize;
+ }
+
+ do {
+ MPN_MUL_N_RECURSE(ctx->tp, up, vp, vsize, ctx->tspace);
+ cy = mpihelp_add_n(prodp, prodp, ctx->tp, vsize);
+ mpihelp_add_1(prodp + vsize, ctx->tp + vsize, vsize,
+ cy);
+ prodp += vsize;
+ up += vsize;
+ usize -= vsize;
+ } while (usize >= vsize);
+ }
+
+ if (usize) {
+ if (usize < KARATSUBA_THRESHOLD) {
+ mpi_limb_t tmp;
+ if (mpihelp_mul(ctx->tspace, vp, vsize, up, usize, &tmp)
+ < 0)
+ return -ENOMEM;
+ } else {
+ if (!ctx->next) {
+ ctx->next = kzalloc(sizeof *ctx, GFP_KERNEL);
+ if (!ctx->next)
+ return -ENOMEM;
+ }
+ if (mpihelp_mul_karatsuba_case(ctx->tspace,
+ vp, vsize,
+ up, usize,
+ ctx->next) < 0)
+ return -ENOMEM;
+ }
+
+ cy = mpihelp_add_n(prodp, prodp, ctx->tspace, vsize);
+ mpihelp_add_1(prodp + vsize, ctx->tspace + vsize, usize, cy);
+ }
+
+ return 0;
+}
+
+void mpihelp_release_karatsuba_ctx(struct karatsuba_ctx *ctx)
+{
+ struct karatsuba_ctx *ctx2;
+
+ if (ctx->tp)
+ mpi_free_limb_space(ctx->tp);
+ if (ctx->tspace)
+ mpi_free_limb_space(ctx->tspace);
+ for (ctx = ctx->next; ctx; ctx = ctx2) {
+ ctx2 = ctx->next;
+ if (ctx->tp)
+ mpi_free_limb_space(ctx->tp);
+ if (ctx->tspace)
+ mpi_free_limb_space(ctx->tspace);
+ kfree(ctx);
+ }
+}
+
+/* Multiply the natural numbers u (pointed to by UP, with USIZE limbs)
+ * and v (pointed to by VP, with VSIZE limbs), and store the result at
+ * PRODP. USIZE + VSIZE limbs are always stored, but if the input
+ * operands are normalized. Return the most significant limb of the
+ * result.
+ *
+ * NOTE: The space pointed to by PRODP is overwritten before finished
+ * with U and V, so overlap is an error.
+ *
+ * Argument constraints:
+ * 1. USIZE >= VSIZE.
+ * 2. PRODP != UP and PRODP != VP, i.e. the destination
+ * must be distinct from the multiplier and the multiplicand.
+ */
+
+int
+mpihelp_mul(mpi_ptr_t prodp, mpi_ptr_t up, mpi_size_t usize,
+ mpi_ptr_t vp, mpi_size_t vsize, mpi_limb_t *_result)
+{
+ mpi_ptr_t prod_endp = prodp + usize + vsize - 1;
+ mpi_limb_t cy;
+ struct karatsuba_ctx ctx;
+
+ if (vsize < KARATSUBA_THRESHOLD) {
+ mpi_size_t i;
+ mpi_limb_t v_limb;
+
+ if (!vsize) {
+ *_result = 0;
+ return 0;
+ }
+
+ /* Multiply by the first limb in V separately, as the result can be
+ * stored (not added) to PROD. We also avoid a loop for zeroing. */
+ v_limb = vp[0];
+ if (v_limb <= 1) {
+ if (v_limb == 1)
+ MPN_COPY(prodp, up, usize);
+ else
+ MPN_ZERO(prodp, usize);
+ cy = 0;
+ } else
+ cy = mpihelp_mul_1(prodp, up, usize, v_limb);
+
+ prodp[usize] = cy;
+ prodp++;
+
+ /* For each iteration in the outer loop, multiply one limb from
+ * U with one limb from V, and add it to PROD. */
+ for (i = 1; i < vsize; i++) {
+ v_limb = vp[i];
+ if (v_limb <= 1) {
+ cy = 0;
+ if (v_limb == 1)
+ cy = mpihelp_add_n(prodp, prodp, up,
+ usize);
+ } else
+ cy = mpihelp_addmul_1(prodp, up, usize, v_limb);
+
+ prodp[usize] = cy;
+ prodp++;
+ }
+
+ *_result = cy;
+ return 0;
+ }
+
+ memset(&ctx, 0, sizeof ctx);
+ if (mpihelp_mul_karatsuba_case(prodp, up, usize, vp, vsize, &ctx) < 0)
+ return -ENOMEM;
+ mpihelp_release_karatsuba_ctx(&ctx);
+ *_result = *prod_endp;
+ return 0;
+}
--- /dev/null
+/* mpiutil.ac - Utility functions for MPI
+ * Copyright (C) 1998, 1999 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#include "mpi-internal.h"
+
+/****************
+ * Note: It was a bad idea to use the number of limbs to allocate
+ * because on a alpha the limbs are large but we normally need
+ * integers of n bits - So we should chnage this to bits (or bytes).
+ *
+ * But mpi_alloc is used in a lot of places :-)
+ */
+MPI mpi_alloc(unsigned nlimbs)
+{
+ MPI a;
+
+ a = kmalloc(sizeof *a, GFP_KERNEL);
+ if (!a)
+ return a;
+
+ if (nlimbs) {
+ a->d = mpi_alloc_limb_space(nlimbs);
+ if (!a->d) {
+ kfree(a);
+ return NULL;
+ }
+ } else {
+ a->d = NULL;
+ }
+
+ a->alloced = nlimbs;
+ a->nlimbs = 0;
+ a->sign = 0;
+ a->flags = 0;
+ a->nbits = 0;
+ return a;
+}
+EXPORT_SYMBOL_GPL(mpi_alloc);
+
+mpi_ptr_t mpi_alloc_limb_space(unsigned nlimbs)
+{
+ size_t len = nlimbs * sizeof(mpi_limb_t);
+
+ return kmalloc(len, GFP_KERNEL);
+}
+
+void mpi_free_limb_space(mpi_ptr_t a)
+{
+ if (!a)
+ return;
+
+ kfree(a);
+}
+
+void mpi_assign_limb_space(MPI a, mpi_ptr_t ap, unsigned nlimbs)
+{
+ mpi_free_limb_space(a->d);
+ a->d = ap;
+ a->alloced = nlimbs;
+}
+
+/****************
+ * Resize the array of A to NLIMBS. the additional space is cleared
+ * (set to 0) [done by m_realloc()]
+ */
+int mpi_resize(MPI a, unsigned nlimbs)
+{
+ void *p;
+
+ if (nlimbs <= a->alloced)
+ return 0; /* no need to do it */
+
+ if (a->d) {
+ p = kmalloc(nlimbs * sizeof(mpi_limb_t), GFP_KERNEL);
+ if (!p)
+ return -ENOMEM;
+ memcpy(p, a->d, a->alloced * sizeof(mpi_limb_t));
+ kfree(a->d);
+ a->d = p;
+ } else {
+ a->d = kzalloc(nlimbs * sizeof(mpi_limb_t), GFP_KERNEL);
+ if (!a->d)
+ return -ENOMEM;
+ }
+ a->alloced = nlimbs;
+ return 0;
+}
+
+void mpi_clear(MPI a)
+{
+ a->nlimbs = 0;
+ a->nbits = 0;
+ a->flags = 0;
+}
+
+void mpi_free(MPI a)
+{
+ if (!a)
+ return;
+
+ if (a->flags & 4)
+ kfree(a->d);
+ else
+ mpi_free_limb_space(a->d);
+
+ if (a->flags & ~7)
+ pr_info("invalid flag value in mpi\n");
+ kfree(a);
+}
+EXPORT_SYMBOL_GPL(mpi_free);
+
+/****************
+ * Note: This copy function should not interpret the MPI
+ * but copy it transparently.
+ */
+int mpi_copy(MPI *copied, const MPI a)
+{
+ size_t i;
+ MPI b;
+
+ *copied = MPI_NULL;
+
+ if (a) {
+ b = mpi_alloc(a->nlimbs);
+ if (!b)
+ return -ENOMEM;
+
+ b->nlimbs = a->nlimbs;
+ b->sign = a->sign;
+ b->flags = a->flags;
+ b->nbits = a->nbits;
+
+ for (i = 0; i < b->nlimbs; i++)
+ b->d[i] = a->d[i];
+
+ *copied = b;
+ }
+
+ return 0;
+}
+
+int mpi_set(MPI w, const MPI u)
+{
+ mpi_ptr_t wp, up;
+ mpi_size_t usize = u->nlimbs;
+ int usign = u->sign;
+
+ if (RESIZE_IF_NEEDED(w, (size_t) usize) < 0)
+ return -ENOMEM;
+
+ wp = w->d;
+ up = u->d;
+ MPN_COPY(wp, up, usize);
+ w->nlimbs = usize;
+ w->nbits = u->nbits;
+ w->flags = u->flags;
+ w->sign = usign;
+ return 0;
+}
+
+int mpi_set_ui(MPI w, unsigned long u)
+{
+ if (RESIZE_IF_NEEDED(w, 1) < 0)
+ return -ENOMEM;
+ w->d[0] = u;
+ w->nlimbs = u ? 1 : 0;
+ w->sign = 0;
+ w->nbits = 0;
+ w->flags = 0;
+ return 0;
+}
+
+MPI mpi_alloc_set_ui(unsigned long u)
+{
+ MPI w = mpi_alloc(1);
+ if (!w)
+ return w;
+ w->d[0] = u;
+ w->nlimbs = u ? 1 : 0;
+ w->sign = 0;
+ return w;
+}
+
+void mpi_swap(MPI a, MPI b)
+{
+ struct gcry_mpi tmp;
+
+ tmp = *a;
+ *a = *b;
+ *b = tmp;
+}
struct aa_profile *profile = sa->aad.profile;
pid_t pid;
rcu_read_lock();
- pid = tsk->real_parent->pid;
+ pid = rcu_dereference(tsk->real_parent)->pid;
rcu_read_unlock();
audit_log_format(ab, " parent=%d", pid);
if (profile->ns != root_ns) {
static int param_set_aabool(const char *val, const struct kernel_param *kp);
static int param_get_aabool(char *buffer, const struct kernel_param *kp);
-#define param_check_aabool(name, p) __param_check(name, p, int)
+#define param_check_aabool param_check_bool
static struct kernel_param_ops param_ops_aabool = {
.set = param_set_aabool,
.get = param_get_aabool
static int param_set_aauint(const char *val, const struct kernel_param *kp);
static int param_get_aauint(char *buffer, const struct kernel_param *kp);
-#define param_check_aauint(name, p) __param_check(name, p, int)
+#define param_check_aauint param_check_uint
static struct kernel_param_ops param_ops_aauint = {
.set = param_set_aauint,
.get = param_get_aauint
static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp);
static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp);
-#define param_check_aalockpolicy(name, p) __param_check(name, p, int)
+#define param_check_aalockpolicy param_check_bool
static struct kernel_param_ops param_ops_aalockpolicy = {
.set = param_set_aalockpolicy,
.get = param_get_aalockpolicy
def_bool y
depends on IMA || EVM
+config INTEGRITY_DIGSIG
+ boolean "Digital signature verification using multiple keyrings"
+ depends on INTEGRITY && KEYS
+ default n
+ select DIGSIG
+ help
+ This option enables digital signature verification support
+ using multiple keyrings. It defines separate keyrings for each
+ of the different use cases - evm, ima, and modules.
+ Different keyrings improves search performance, but also allow
+ to "lock" certain keyring to prevent adding new keys.
+ This is useful for evm and module keyrings, when keys are
+ usually only added from initramfs.
+
source security/integrity/ima/Kconfig
source security/integrity/evm/Kconfig
#
obj-$(CONFIG_INTEGRITY) += integrity.o
+obj-$(CONFIG_INTEGRITY_DIGSIG) += digsig.o
integrity-y := iint.o
--- /dev/null
+/*
+ * Copyright (C) 2011 Intel Corporation
+ *
+ * Author:
+ * Dmitry Kasatkin <dmitry.kasatkin@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/err.h>
+#include <linux/rbtree.h>
+#include <linux/key-type.h>
+#include <linux/digsig.h>
+
+#include "integrity.h"
+
+static struct key *keyring[INTEGRITY_KEYRING_MAX];
+
+static const char *keyring_name[INTEGRITY_KEYRING_MAX] = {
+ "_evm",
+ "_module",
+ "_ima",
+};
+
+int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
+ const char *digest, int digestlen)
+{
+ if (id >= INTEGRITY_KEYRING_MAX)
+ return -EINVAL;
+
+ if (!keyring[id]) {
+ keyring[id] =
+ request_key(&key_type_keyring, keyring_name[id], NULL);
+ if (IS_ERR(keyring[id])) {
+ int err = PTR_ERR(keyring[id]);
+ pr_err("no %s keyring: %d\n", keyring_name[id], err);
+ keyring[id] = NULL;
+ return err;
+ }
+ }
+
+ return digsig_verify(keyring[id], sig, siglen, digest, digestlen);
+}
* File: evm.h
*
*/
+
+#ifndef __INTEGRITY_EVM_H
+#define __INTEGRITY_EVM_H
+
#include <linux/xattr.h>
#include <linux/security.h>
+
#include "../integrity.h"
extern int evm_initialized;
extern char *evm_hmac;
+extern char *evm_hash;
extern struct crypto_shash *hmac_tfm;
+extern struct crypto_shash *hash_tfm;
/* List of EVM protected security xattrs */
extern char *evm_config_xattrnames[];
extern int evm_calc_hmac(struct dentry *dentry, const char *req_xattr_name,
const char *req_xattr_value,
size_t req_xattr_value_len, char *digest);
+extern int evm_calc_hash(struct dentry *dentry, const char *req_xattr_name,
+ const char *req_xattr_value,
+ size_t req_xattr_value_len, char *digest);
extern int evm_init_hmac(struct inode *inode, const struct xattr *xattr,
char *hmac_val);
extern int evm_init_secfs(void);
extern void evm_cleanup_secfs(void);
+
+#endif
static int evmkey_len = MAX_KEY_SIZE;
struct crypto_shash *hmac_tfm;
+struct crypto_shash *hash_tfm;
static DEFINE_MUTEX(mutex);
-static struct shash_desc *init_desc(void)
+static struct shash_desc *init_desc(char type)
{
- int rc;
+ long rc;
+ char *algo;
+ struct crypto_shash **tfm;
struct shash_desc *desc;
- if (hmac_tfm == NULL) {
+ if (type == EVM_XATTR_HMAC) {
+ tfm = &hmac_tfm;
+ algo = evm_hmac;
+ } else {
+ tfm = &hash_tfm;
+ algo = evm_hash;
+ }
+
+ if (*tfm == NULL) {
mutex_lock(&mutex);
- if (hmac_tfm)
+ if (*tfm)
goto out;
- hmac_tfm = crypto_alloc_shash(evm_hmac, 0, CRYPTO_ALG_ASYNC);
- if (IS_ERR(hmac_tfm)) {
- pr_err("Can not allocate %s (reason: %ld)\n",
- evm_hmac, PTR_ERR(hmac_tfm));
- rc = PTR_ERR(hmac_tfm);
- hmac_tfm = NULL;
+ *tfm = crypto_alloc_shash(algo, 0, CRYPTO_ALG_ASYNC);
+ if (IS_ERR(*tfm)) {
+ rc = PTR_ERR(*tfm);
+ pr_err("Can not allocate %s (reason: %ld)\n", algo, rc);
+ *tfm = NULL;
mutex_unlock(&mutex);
return ERR_PTR(rc);
}
- rc = crypto_shash_setkey(hmac_tfm, evmkey, evmkey_len);
- if (rc) {
- crypto_free_shash(hmac_tfm);
- hmac_tfm = NULL;
- mutex_unlock(&mutex);
- return ERR_PTR(rc);
+ if (type == EVM_XATTR_HMAC) {
+ rc = crypto_shash_setkey(*tfm, evmkey, evmkey_len);
+ if (rc) {
+ crypto_free_shash(*tfm);
+ *tfm = NULL;
+ mutex_unlock(&mutex);
+ return ERR_PTR(rc);
+ }
}
out:
mutex_unlock(&mutex);
}
- desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(hmac_tfm),
+ desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(*tfm),
GFP_KERNEL);
if (!desc)
return ERR_PTR(-ENOMEM);
- desc->tfm = hmac_tfm;
+ desc->tfm = *tfm;
desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
rc = crypto_shash_init(desc);
* the hmac using the requested xattr value. Don't alloc/free memory for
* each xattr, but attempt to re-use the previously allocated memory.
*/
-int evm_calc_hmac(struct dentry *dentry, const char *req_xattr_name,
- const char *req_xattr_value, size_t req_xattr_value_len,
- char *digest)
+static int evm_calc_hmac_or_hash(struct dentry *dentry,
+ const char *req_xattr_name,
+ const char *req_xattr_value,
+ size_t req_xattr_value_len,
+ char type, char *digest)
{
struct inode *inode = dentry->d_inode;
struct shash_desc *desc;
if (!inode->i_op || !inode->i_op->getxattr)
return -EOPNOTSUPP;
- desc = init_desc();
+ desc = init_desc(type);
if (IS_ERR(desc))
return PTR_ERR(desc);
return error;
}
+int evm_calc_hmac(struct dentry *dentry, const char *req_xattr_name,
+ const char *req_xattr_value, size_t req_xattr_value_len,
+ char *digest)
+{
+ return evm_calc_hmac_or_hash(dentry, req_xattr_name, req_xattr_value,
+ req_xattr_value_len, EVM_XATTR_HMAC, digest);
+}
+
+int evm_calc_hash(struct dentry *dentry, const char *req_xattr_name,
+ const char *req_xattr_value, size_t req_xattr_value_len,
+ char *digest)
+{
+ return evm_calc_hmac_or_hash(dentry, req_xattr_name, req_xattr_value,
+ req_xattr_value_len, IMA_XATTR_DIGEST, digest);
+}
+
/*
* Calculate the hmac and update security.evm xattr
*
{
struct shash_desc *desc;
- desc = init_desc();
+ desc = init_desc(EVM_XATTR_HMAC);
if (IS_ERR(desc)) {
printk(KERN_INFO "init_desc failed\n");
return PTR_ERR(desc);
int evm_initialized;
char *evm_hmac = "hmac(sha1)";
+char *evm_hash = "sha1";
char *evm_config_xattrnames[] = {
#ifdef CONFIG_SECURITY_SELINUX
}
__setup("evm=", evm_set_fixmode);
+static int evm_find_protected_xattrs(struct dentry *dentry)
+{
+ struct inode *inode = dentry->d_inode;
+ char **xattr;
+ int error;
+ int count = 0;
+
+ if (!inode->i_op || !inode->i_op->getxattr)
+ return -EOPNOTSUPP;
+
+ for (xattr = evm_config_xattrnames; *xattr != NULL; xattr++) {
+ error = inode->i_op->getxattr(dentry, *xattr, NULL, 0);
+ if (error < 0) {
+ if (error == -ENODATA)
+ continue;
+ return error;
+ }
+ count++;
+ }
+
+ return count;
+}
+
/*
* evm_verify_hmac - calculate and compare the HMAC with the EVM xattr
*
size_t xattr_value_len,
struct integrity_iint_cache *iint)
{
- struct evm_ima_xattr_data xattr_data;
+ struct evm_ima_xattr_data *xattr_data = NULL;
+ struct evm_ima_xattr_data calc;
enum integrity_status evm_status = INTEGRITY_PASS;
- int rc;
+ int rc, xattr_len;
if (iint && iint->evm_status == INTEGRITY_PASS)
return iint->evm_status;
/* if status is not PASS, try to check again - against -ENOMEM */
- rc = evm_calc_hmac(dentry, xattr_name, xattr_value,
- xattr_value_len, xattr_data.digest);
- if (rc < 0) {
- evm_status = (rc == -ENODATA)
- ? INTEGRITY_NOXATTRS : INTEGRITY_FAIL;
+ /* first need to know the sig type */
+ rc = vfs_getxattr_alloc(dentry, XATTR_NAME_EVM, (char **)&xattr_data, 0,
+ GFP_NOFS);
+ if (rc <= 0) {
+ if (rc == 0)
+ evm_status = INTEGRITY_FAIL; /* empty */
+ else if (rc == -ENODATA) {
+ rc = evm_find_protected_xattrs(dentry);
+ if (rc > 0)
+ evm_status = INTEGRITY_NOLABEL;
+ else if (rc == 0)
+ evm_status = INTEGRITY_NOXATTRS; /* new file */
+ }
goto out;
}
- xattr_data.type = EVM_XATTR_HMAC;
- rc = vfs_xattr_cmp(dentry, XATTR_NAME_EVM, (u8 *)&xattr_data,
- sizeof xattr_data, GFP_NOFS);
- if (rc < 0)
- evm_status = (rc == -ENODATA)
- ? INTEGRITY_NOLABEL : INTEGRITY_FAIL;
+ xattr_len = rc - 1;
+
+ /* check value type */
+ switch (xattr_data->type) {
+ case EVM_XATTR_HMAC:
+ rc = evm_calc_hmac(dentry, xattr_name, xattr_value,
+ xattr_value_len, calc.digest);
+ if (rc)
+ break;
+ rc = memcmp(xattr_data->digest, calc.digest,
+ sizeof(calc.digest));
+ if (rc)
+ rc = -EINVAL;
+ break;
+ case EVM_IMA_XATTR_DIGSIG:
+ rc = evm_calc_hash(dentry, xattr_name, xattr_value,
+ xattr_value_len, calc.digest);
+ if (rc)
+ break;
+ rc = integrity_digsig_verify(INTEGRITY_KEYRING_EVM,
+ xattr_data->digest, xattr_len,
+ calc.digest, sizeof(calc.digest));
+ if (!rc) {
+ /* we probably want to replace rsa with hmac here */
+ evm_update_evmxattr(dentry, xattr_name, xattr_value,
+ xattr_value_len);
+ }
+ break;
+ default:
+ rc = -EINVAL;
+ break;
+ }
+
+ if (rc)
+ evm_status = (rc == -ENODATA) ?
+ INTEGRITY_NOXATTRS : INTEGRITY_FAIL;
out:
if (iint)
iint->evm_status = evm_status;
+ kfree(xattr_data);
return evm_status;
}
printk(KERN_INFO "EVM: Error registering secfs\n");
goto err;
}
+
+ return 0;
err:
return error;
}
evm_cleanup_secfs();
if (hmac_tfm)
crypto_free_shash(hmac_tfm);
+ if (hash_tfm)
+ crypto_free_shash(hash_tfm);
}
/*
strncpy(entry->template.file_name, filename, IMA_EVENT_NAME_LEN_MAX);
result = ima_store_template(entry, violation, inode);
- if (!result)
+ if (!result || result == -EEXIST)
iint->flags |= IMA_MEASURED;
- else
+ if (result < 0)
kfree(entry);
}
#include <linux/slab.h>
#include "ima.h"
+#define AUDIT_CAUSE_LEN_MAX 32
+
LIST_HEAD(ima_measurements); /* list of all measurements */
/* key: inode (before secure-hashing a file) */
result = tpm_pcr_extend(TPM_ANY_NUM, CONFIG_IMA_MEASURE_PCR_IDX, hash);
if (result != 0)
- pr_err("IMA: Error Communicating to TPM chip\n");
+ pr_err("IMA: Error Communicating to TPM chip, result: %d\n",
+ result);
return result;
}
{
u8 digest[IMA_DIGEST_SIZE];
const char *audit_cause = "hash_added";
+ char tpm_audit_cause[AUDIT_CAUSE_LEN_MAX];
int audit_info = 1;
- int result = 0;
+ int result = 0, tpmresult = 0;
mutex_lock(&ima_extend_list_mutex);
if (!violation) {
memcpy(digest, entry->digest, sizeof digest);
if (ima_lookup_digest_entry(digest)) {
audit_cause = "hash_exists";
+ result = -EEXIST;
goto out;
}
}
if (violation) /* invalidate pcr */
memset(digest, 0xff, sizeof digest);
- result = ima_pcr_extend(digest);
- if (result != 0) {
- audit_cause = "TPM error";
+ tpmresult = ima_pcr_extend(digest);
+ if (tpmresult != 0) {
+ snprintf(tpm_audit_cause, AUDIT_CAUSE_LEN_MAX, "TPM_error(%d)",
+ tpmresult);
+ audit_cause = tpm_audit_cause;
audit_info = 0;
}
out:
struct integrity_iint_cache *integrity_iint_insert(struct inode *inode);
struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
+#define INTEGRITY_KEYRING_EVM 0
+#define INTEGRITY_KEYRING_MODULE 1
+#define INTEGRITY_KEYRING_IMA 2
+#define INTEGRITY_KEYRING_MAX 3
+
+#ifdef CONFIG_INTEGRITY_DIGSIG
+
+int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
+ const char *digest, int digestlen);
+
+#else
+
+static inline int integrity_digsig_verify(const unsigned int id,
+ const char *sig, int siglen,
+ const char *digest, int digestlen)
+{
+ return -EOPNOTSUPP;
+}
+
+#endif /* CONFIG_INTEGRITY_DIGSIG */
+
/* set during initialization */
extern int iint_initialized;
atomic_set(&key->usage, 1);
init_rwsem(&key->sem);
+ lockdep_set_class(&key->sem, &type->lock_class);
key->type = type;
key->user = user;
key->quotalen = quotalen;
struct key_type *p;
int ret;
+ memset(&ktype->lock_class, 0, sizeof(ktype->lock_class));
+
ret = -EEXIST;
down_write(&key_types_sem);
return length;
}
-static inline int hexcode_to_int(int code) {
- if (code == '\0' || !isxdigit(code))
- return -1;
- if (isdigit(code))
- return code - '0';
- return tolower(code) - 'a' + 10;
-}
-
static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
{
char *scon = NULL, *tcon = NULL;
if (c1 == '+')
c1 = ' ';
else if (c1 == '%') {
- if ((c1 = hexcode_to_int(*r++)) < 0)
+ c1 = hex_to_bin(*r++);
+ if (c1 < 0)
goto out;
- if ((c2 = hexcode_to_int(*r++)) < 0)
+ c2 = hex_to_bin(*r++);
+ if (c2 < 0)
goto out;
c1 = (c1 << 4) | c2;
}
int cond_init_bool_indexes(struct policydb *p)
{
kfree(p->bool_val_to_struct);
- p->bool_val_to_struct = (struct cond_bool_datum **)
+ p->bool_val_to_struct =
kmalloc(p->p_bools.nprim * sizeof(struct cond_bool_datum *), GFP_KERNEL);
if (!p->bool_val_to_struct)
return -ENOMEM;
--- /dev/null
+builtin-policy.h
+policy/
{
pid_t pid;
rcu_read_lock();
- pid = task_tgid_vnr(current->real_parent);
+ pid = task_tgid_vnr(rcu_dereference(current->real_parent));
rcu_read_unlock();
return pid;
}
projects / firefly-linux-kernel-4.4.55.git / commitdiff