2 * fs/cifs/cifsencrypt.c
4 * Copyright (C) International Business Machines Corp., 2005,2006
5 * Author(s): Steve French (sfrench@us.ibm.com)
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include <linux/slab.h>
26 #include "cifs_debug.h"
27 #include "cifs_unicode.h"
28 #include "cifsproto.h"
30 #include <linux/ctype.h>
31 #include <linux/random.h>
34 * Calculate and return the CIFS signature based on the mac key and SMB PDU.
35 * The 16 byte signature must be allocated by the caller. Note we only use the
36 * 1st eight bytes and that the smb header signature field on input contains
37 * the sequence number before this function is called. Also, this function
38 * should be called with the server->srv_mutex held.
40 static int cifs_calculate_signature(const struct smb_hdr *cifs_pdu,
41 struct TCP_Server_Info *server, char *signature)
45 if (cifs_pdu == NULL || signature == NULL || server == NULL)
48 if (!server->secmech.sdescmd5) {
49 cERROR(1, "%s: Can't generate signature\n", __func__);
53 rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
55 cERROR(1, "%s: Could not init md5\n", __func__);
59 rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
60 server->session_key.response, server->session_key.len);
62 cERROR(1, "%s: Could not update with response\n", __func__);
66 rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
67 cifs_pdu->Protocol, be32_to_cpu(cifs_pdu->smb_buf_length));
69 cERROR(1, "%s: Could not update with payload\n", __func__);
73 rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
75 cERROR(1, "%s: Could not generate md5 hash\n", __func__);
80 /* must be called with server->srv_mutex held */
81 int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
82 __u32 *pexpected_response_sequence_number)
85 char smb_signature[20];
87 if ((cifs_pdu == NULL) || (server == NULL))
90 if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
91 server->tcpStatus == CifsNeedNegotiate)
94 if (!server->session_estab) {
95 strncpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
99 cifs_pdu->Signature.Sequence.SequenceNumber =
100 cpu_to_le32(server->sequence_number);
101 cifs_pdu->Signature.Sequence.Reserved = 0;
103 *pexpected_response_sequence_number = server->sequence_number++;
104 server->sequence_number++;
106 rc = cifs_calculate_signature(cifs_pdu, server, smb_signature);
108 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
110 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
115 static int cifs_calc_signature2(const struct kvec *iov, int n_vec,
116 struct TCP_Server_Info *server, char *signature)
121 if (iov == NULL || signature == NULL || server == NULL)
124 if (!server->secmech.sdescmd5) {
125 cERROR(1, "%s: Can't generate signature\n", __func__);
129 rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
131 cERROR(1, "%s: Could not init md5\n", __func__);
135 rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
136 server->session_key.response, server->session_key.len);
138 cERROR(1, "%s: Could not update with response\n", __func__);
142 for (i = 0; i < n_vec; i++) {
143 if (iov[i].iov_len == 0)
145 if (iov[i].iov_base == NULL) {
146 cERROR(1, "null iovec entry");
149 /* The first entry includes a length field (which does not get
150 signed that occupies the first 4 bytes before the header */
152 if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
153 break; /* nothing to sign or corrupt header */
155 crypto_shash_update(&server->secmech.sdescmd5->shash,
156 iov[i].iov_base + 4, iov[i].iov_len - 4);
159 crypto_shash_update(&server->secmech.sdescmd5->shash,
160 iov[i].iov_base, iov[i].iov_len);
163 cERROR(1, "%s: Could not update with payload\n",
169 rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
171 cERROR(1, "%s: Could not generate md5 hash\n", __func__);
176 /* must be called with server->srv_mutex held */
177 int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
178 __u32 *pexpected_response_sequence_number)
181 char smb_signature[20];
182 struct smb_hdr *cifs_pdu = iov[0].iov_base;
184 if ((cifs_pdu == NULL) || (server == NULL))
187 if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
188 server->tcpStatus == CifsNeedNegotiate)
191 if (!server->session_estab) {
192 strncpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
196 cifs_pdu->Signature.Sequence.SequenceNumber =
197 cpu_to_le32(server->sequence_number);
198 cifs_pdu->Signature.Sequence.Reserved = 0;
200 *pexpected_response_sequence_number = server->sequence_number++;
201 server->sequence_number++;
203 rc = cifs_calc_signature2(iov, n_vec, server, smb_signature);
205 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
207 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
212 int cifs_verify_signature(struct smb_hdr *cifs_pdu,
213 struct TCP_Server_Info *server,
214 __u32 expected_sequence_number)
217 char server_response_sig[8];
218 char what_we_think_sig_should_be[20];
220 if (cifs_pdu == NULL || server == NULL)
223 if (!server->session_estab)
226 if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
227 struct smb_com_lock_req *pSMB =
228 (struct smb_com_lock_req *)cifs_pdu;
229 if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
233 /* BB what if signatures are supposed to be on for session but
234 server does not send one? BB */
236 /* Do not need to verify session setups with signature "BSRSPYL " */
237 if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
238 cFYI(1, "dummy signature received for smb command 0x%x",
241 /* save off the origiginal signature so we can modify the smb and check
242 its signature against what the server sent */
243 memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
245 cifs_pdu->Signature.Sequence.SequenceNumber =
246 cpu_to_le32(expected_sequence_number);
247 cifs_pdu->Signature.Sequence.Reserved = 0;
249 mutex_lock(&server->srv_mutex);
250 rc = cifs_calculate_signature(cifs_pdu, server,
251 what_we_think_sig_should_be);
252 mutex_unlock(&server->srv_mutex);
257 /* cifs_dump_mem("what we think it should be: ",
258 what_we_think_sig_should_be, 16); */
260 if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
267 /* first calculate 24 bytes ntlm response and then 16 byte session key */
268 int setup_ntlm_response(struct cifs_ses *ses)
271 unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
272 char temp_key[CIFS_SESS_KEY_SIZE];
277 ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
278 if (!ses->auth_key.response) {
279 cERROR(1, "NTLM can't allocate (%u bytes) memory", temp_len);
282 ses->auth_key.len = temp_len;
284 rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
285 ses->auth_key.response + CIFS_SESS_KEY_SIZE);
287 cFYI(1, "%s Can't generate NTLM response, error: %d",
292 rc = E_md4hash(ses->password, temp_key);
294 cFYI(1, "%s Can't generate NT hash, error: %d", __func__, rc);
298 rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
300 cFYI(1, "%s Can't generate NTLM session key, error: %d",
306 #ifdef CONFIG_CIFS_WEAK_PW_HASH
307 int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
308 char *lnm_session_key)
312 char password_with_pad[CIFS_ENCPWD_SIZE];
314 memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
316 strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
318 if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
319 memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE);
320 memcpy(lnm_session_key, password_with_pad,
325 /* calculate old style session key */
326 /* calling toupper is less broken than repeatedly
327 calling nls_toupper would be since that will never
328 work for UTF8, but neither handles multibyte code pages
329 but the only alternative would be converting to UCS-16 (Unicode)
330 (using a routine something like UniStrupr) then
331 uppercasing and then converting back from Unicode - which
332 would only worth doing it if we knew it were utf8. Basically
333 utf8 and other multibyte codepages each need their own strupper
334 function since a byte at a time will ont work. */
336 for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
337 password_with_pad[i] = toupper(password_with_pad[i]);
339 rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
343 #endif /* CIFS_WEAK_PW_HASH */
345 /* Build a proper attribute value/target info pairs blob.
346 * Fill in netbios and dns domain name and workstation name
347 * and client time (total five av pairs and + one end of fields indicator.
348 * Allocate domain name which gets freed when session struct is deallocated.
351 build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
354 unsigned int size = 2 * sizeof(struct ntlmssp2_name);
355 char *defdmname = "WORKGROUP";
356 unsigned char *blobptr;
357 struct ntlmssp2_name *attrptr;
359 if (!ses->domainName) {
360 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
361 if (!ses->domainName)
365 dlen = strlen(ses->domainName);
368 * The length of this blob is two times the size of a
369 * structure (av pair) which holds name/size
370 * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
371 * unicode length of a netbios domain name
373 ses->auth_key.len = size + 2 * dlen;
374 ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
375 if (!ses->auth_key.response) {
376 ses->auth_key.len = 0;
377 cERROR(1, "Challenge target info allocation failure");
381 blobptr = ses->auth_key.response;
382 attrptr = (struct ntlmssp2_name *) blobptr;
385 * As defined in MS-NTLM 3.3.2, just this av pair field
386 * is sufficient as part of the temp
388 attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
389 attrptr->length = cpu_to_le16(2 * dlen);
390 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
391 cifs_strtoUCS((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
396 /* Server has provided av pairs/target info in the type 2 challenge
397 * packet and we have plucked it and stored within smb session.
398 * We parse that blob here to find netbios domain name to be used
399 * as part of ntlmv2 authentication (in Target String), if not already
400 * specified on the command line.
401 * If this function returns without any error but without fetching
402 * domain name, authentication may fail against some server but
403 * may not fail against other (those who are not very particular
404 * about target string i.e. for some, just user name might suffice.
407 find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
409 unsigned int attrsize;
411 unsigned int onesize = sizeof(struct ntlmssp2_name);
412 unsigned char *blobptr;
413 unsigned char *blobend;
414 struct ntlmssp2_name *attrptr;
416 if (!ses->auth_key.len || !ses->auth_key.response)
419 blobptr = ses->auth_key.response;
420 blobend = blobptr + ses->auth_key.len;
422 while (blobptr + onesize < blobend) {
423 attrptr = (struct ntlmssp2_name *) blobptr;
424 type = le16_to_cpu(attrptr->type);
425 if (type == NTLMSSP_AV_EOL)
427 blobptr += 2; /* advance attr type */
428 attrsize = le16_to_cpu(attrptr->length);
429 blobptr += 2; /* advance attr size */
430 if (blobptr + attrsize > blobend)
432 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
435 if (!ses->domainName) {
437 kmalloc(attrsize + 1, GFP_KERNEL);
438 if (!ses->domainName)
440 cifs_from_ucs2(ses->domainName,
441 (__le16 *)blobptr, attrsize, attrsize,
446 blobptr += attrsize; /* advance attr value */
452 static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
453 const struct nls_table *nls_cp)
457 char nt_hash[CIFS_NTHASH_SIZE];
462 if (!ses->server->secmech.sdeschmacmd5) {
463 cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
467 /* calculate md4 hash of password */
468 E_md4hash(ses->password, nt_hash);
470 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
473 cERROR(1, "%s: Could not set NT Hash as a key", __func__);
477 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
479 cERROR(1, "calc_ntlmv2_hash: could not init hmacmd5\n");
483 /* convert ses->user_name to unicode and uppercase */
484 len = strlen(ses->user_name);
485 user = kmalloc(2 + (len * 2), GFP_KERNEL);
487 cERROR(1, "calc_ntlmv2_hash: user mem alloc failure\n");
491 len = cifs_strtoUCS((__le16 *)user, ses->user_name, len, nls_cp);
494 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
495 (char *)user, 2 * len);
498 cERROR(1, "%s: Could not update with user\n", __func__);
502 /* convert ses->domainName to unicode and uppercase */
503 if (ses->domainName) {
504 len = strlen(ses->domainName);
506 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
507 if (domain == NULL) {
508 cERROR(1, "calc_ntlmv2_hash: domain mem alloc failure");
512 len = cifs_strtoUCS((__le16 *)domain, ses->domainName, len,
515 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
516 (char *)domain, 2 * len);
519 cERROR(1, "%s: Could not update with domain\n",
523 } else if (ses->serverName) {
524 len = strlen(ses->serverName);
526 server = kmalloc(2 + (len * 2), GFP_KERNEL);
527 if (server == NULL) {
528 cERROR(1, "calc_ntlmv2_hash: server mem alloc failure");
532 len = cifs_strtoUCS((__le16 *)server, ses->serverName, len,
535 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
536 (char *)server, 2 * len);
539 cERROR(1, "%s: Could not update with server\n",
545 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
548 cERROR(1, "%s: Could not generate md5 hash\n", __func__);
554 CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
557 unsigned int offset = CIFS_SESS_KEY_SIZE + 8;
559 if (!ses->server->secmech.sdeschmacmd5) {
560 cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
564 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
565 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
567 cERROR(1, "%s: Could not set NTLMV2 Hash as a key", __func__);
571 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
573 cERROR(1, "CalcNTLMv2_response: could not init hmacmd5");
577 if (ses->server->secType == RawNTLMSSP)
578 memcpy(ses->auth_key.response + offset,
579 ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
581 memcpy(ses->auth_key.response + offset,
582 ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
583 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
584 ses->auth_key.response + offset, ses->auth_key.len - offset);
586 cERROR(1, "%s: Could not update with response\n", __func__);
590 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
591 ses->auth_key.response + CIFS_SESS_KEY_SIZE);
593 cERROR(1, "%s: Could not generate md5 hash\n", __func__);
600 setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
605 struct ntlmv2_resp *buf;
606 char ntlmv2_hash[16];
607 unsigned char *tiblob = NULL; /* target info blob */
609 if (ses->server->secType == RawNTLMSSP) {
610 if (!ses->domainName) {
611 rc = find_domain_name(ses, nls_cp);
613 cERROR(1, "error %d finding domain name", rc);
614 goto setup_ntlmv2_rsp_ret;
618 rc = build_avpair_blob(ses, nls_cp);
620 cERROR(1, "error %d building av pair blob", rc);
621 goto setup_ntlmv2_rsp_ret;
625 baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
626 tilen = ses->auth_key.len;
627 tiblob = ses->auth_key.response;
629 ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
630 if (!ses->auth_key.response) {
632 ses->auth_key.len = 0;
633 cERROR(1, "%s: Can't allocate auth blob", __func__);
634 goto setup_ntlmv2_rsp_ret;
636 ses->auth_key.len += baselen;
638 buf = (struct ntlmv2_resp *)
639 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
640 buf->blob_signature = cpu_to_le32(0x00000101);
642 buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
643 get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
646 memcpy(ses->auth_key.response + baselen, tiblob, tilen);
648 /* calculate ntlmv2_hash */
649 rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
651 cERROR(1, "could not get v2 hash rc %d", rc);
652 goto setup_ntlmv2_rsp_ret;
655 /* calculate first part of the client response (CR1) */
656 rc = CalcNTLMv2_response(ses, ntlmv2_hash);
658 cERROR(1, "Could not calculate CR1 rc: %d", rc);
659 goto setup_ntlmv2_rsp_ret;
662 /* now calculate the session key for NTLMv2 */
663 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
664 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
666 cERROR(1, "%s: Could not set NTLMV2 Hash as a key", __func__);
667 goto setup_ntlmv2_rsp_ret;
670 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
672 cERROR(1, "%s: Could not init hmacmd5\n", __func__);
673 goto setup_ntlmv2_rsp_ret;
676 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
677 ses->auth_key.response + CIFS_SESS_KEY_SIZE,
678 CIFS_HMAC_MD5_HASH_SIZE);
680 cERROR(1, "%s: Could not update with response\n", __func__);
681 goto setup_ntlmv2_rsp_ret;
684 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
685 ses->auth_key.response);
687 cERROR(1, "%s: Could not generate md5 hash\n", __func__);
689 setup_ntlmv2_rsp_ret:
696 calc_seckey(struct cifs_ses *ses)
699 struct crypto_blkcipher *tfm_arc4;
700 struct scatterlist sgin, sgout;
701 struct blkcipher_desc desc;
702 unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
704 get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
706 tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
707 if (IS_ERR(tfm_arc4)) {
708 rc = PTR_ERR(tfm_arc4);
709 cERROR(1, "could not allocate crypto API arc4\n");
715 rc = crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response,
718 cERROR(1, "%s: Could not set response as a key", __func__);
722 sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
723 sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
725 rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE);
727 cERROR(1, "could not encrypt session key rc: %d\n", rc);
728 crypto_free_blkcipher(tfm_arc4);
732 /* make secondary_key/nonce as session key */
733 memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
734 /* and make len as that of session key only */
735 ses->auth_key.len = CIFS_SESS_KEY_SIZE;
737 crypto_free_blkcipher(tfm_arc4);
743 cifs_crypto_shash_release(struct TCP_Server_Info *server)
745 if (server->secmech.md5)
746 crypto_free_shash(server->secmech.md5);
748 if (server->secmech.hmacmd5)
749 crypto_free_shash(server->secmech.hmacmd5);
751 kfree(server->secmech.sdeschmacmd5);
753 kfree(server->secmech.sdescmd5);
757 cifs_crypto_shash_allocate(struct TCP_Server_Info *server)
762 server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
763 if (IS_ERR(server->secmech.hmacmd5)) {
764 cERROR(1, "could not allocate crypto hmacmd5\n");
765 return PTR_ERR(server->secmech.hmacmd5);
768 server->secmech.md5 = crypto_alloc_shash("md5", 0, 0);
769 if (IS_ERR(server->secmech.md5)) {
770 cERROR(1, "could not allocate crypto md5\n");
771 rc = PTR_ERR(server->secmech.md5);
772 goto crypto_allocate_md5_fail;
775 size = sizeof(struct shash_desc) +
776 crypto_shash_descsize(server->secmech.hmacmd5);
777 server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
778 if (!server->secmech.sdeschmacmd5) {
779 cERROR(1, "cifs_crypto_shash_allocate: can't alloc hmacmd5\n");
781 goto crypto_allocate_hmacmd5_sdesc_fail;
783 server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
784 server->secmech.sdeschmacmd5->shash.flags = 0x0;
787 size = sizeof(struct shash_desc) +
788 crypto_shash_descsize(server->secmech.md5);
789 server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL);
790 if (!server->secmech.sdescmd5) {
791 cERROR(1, "cifs_crypto_shash_allocate: can't alloc md5\n");
793 goto crypto_allocate_md5_sdesc_fail;
795 server->secmech.sdescmd5->shash.tfm = server->secmech.md5;
796 server->secmech.sdescmd5->shash.flags = 0x0;
800 crypto_allocate_md5_sdesc_fail:
801 kfree(server->secmech.sdeschmacmd5);
803 crypto_allocate_hmacmd5_sdesc_fail:
804 crypto_free_shash(server->secmech.md5);
806 crypto_allocate_md5_fail:
807 crypto_free_shash(server->secmech.hmacmd5);