Merge branch 'for-3.5-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj...
[firefly-linux-kernel-4.4.55.git] / drivers / crypto / nx / nx-sha256.c
1 /**
2  * SHA-256 routines supporting the Power 7+ Nest Accelerators driver
3  *
4  * Copyright (C) 2011-2012 International Business Machines Inc.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; version 2 only.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, write to the Free Software
17  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18  *
19  * Author: Kent Yoder <yoder1@us.ibm.com>
20  */
21
22 #include <crypto/internal/hash.h>
23 #include <crypto/sha.h>
24 #include <linux/module.h>
25 #include <asm/vio.h>
26
27 #include "nx_csbcpb.h"
28 #include "nx.h"
29
30
31 static int nx_sha256_init(struct shash_desc *desc)
32 {
33         struct sha256_state *sctx = shash_desc_ctx(desc);
34         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
35         struct nx_sg *out_sg;
36
37         nx_ctx_init(nx_ctx, HCOP_FC_SHA);
38
39         memset(sctx, 0, sizeof *sctx);
40
41         nx_ctx->ap = &nx_ctx->props[NX_PROPS_SHA256];
42
43         NX_CPB_SET_DIGEST_SIZE(nx_ctx->csbcpb, NX_DS_SHA256);
44         out_sg = nx_build_sg_list(nx_ctx->out_sg, (u8 *)sctx->state,
45                                   SHA256_DIGEST_SIZE, nx_ctx->ap->sglen);
46         nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg);
47
48         return 0;
49 }
50
51 static int nx_sha256_update(struct shash_desc *desc, const u8 *data,
52                             unsigned int len)
53 {
54         struct sha256_state *sctx = shash_desc_ctx(desc);
55         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
56         struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
57         struct nx_sg *in_sg;
58         u64 to_process, leftover;
59         int rc = 0;
60
61         if (NX_CPB_FDM(csbcpb) & NX_FDM_CONTINUATION) {
62                 /* we've hit the nx chip previously and we're updating again,
63                  * so copy over the partial digest */
64                 memcpy(csbcpb->cpb.sha256.input_partial_digest,
65                        csbcpb->cpb.sha256.message_digest, SHA256_DIGEST_SIZE);
66         }
67
68         /* 2 cases for total data len:
69          *  1: <= SHA256_BLOCK_SIZE: copy into state, return 0
70          *  2: > SHA256_BLOCK_SIZE: process X blocks, copy in leftover
71          */
72         if (len + sctx->count <= SHA256_BLOCK_SIZE) {
73                 memcpy(sctx->buf + sctx->count, data, len);
74                 sctx->count += len;
75                 goto out;
76         }
77
78         /* to_process: the SHA256_BLOCK_SIZE data chunk to process in this
79          * update */
80         to_process = (sctx->count + len) & ~(SHA256_BLOCK_SIZE - 1);
81         leftover = (sctx->count + len) & (SHA256_BLOCK_SIZE - 1);
82
83         if (sctx->count) {
84                 in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *)sctx->buf,
85                                          sctx->count, nx_ctx->ap->sglen);
86                 in_sg = nx_build_sg_list(in_sg, (u8 *)data,
87                                          to_process - sctx->count,
88                                          nx_ctx->ap->sglen);
89                 nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) *
90                                         sizeof(struct nx_sg);
91         } else {
92                 in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *)data,
93                                          to_process, nx_ctx->ap->sglen);
94                 nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) *
95                                         sizeof(struct nx_sg);
96         }
97
98         NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
99
100         if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
101                 rc = -EINVAL;
102                 goto out;
103         }
104
105         rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
106                            desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
107         if (rc)
108                 goto out;
109
110         atomic_inc(&(nx_ctx->stats->sha256_ops));
111
112         /* copy the leftover back into the state struct */
113         memcpy(sctx->buf, data + len - leftover, leftover);
114         sctx->count = leftover;
115
116         csbcpb->cpb.sha256.message_bit_length += (u64)
117                 (csbcpb->cpb.sha256.spbc * 8);
118
119         /* everything after the first update is continuation */
120         NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
121 out:
122         return rc;
123 }
124
125 static int nx_sha256_final(struct shash_desc *desc, u8 *out)
126 {
127         struct sha256_state *sctx = shash_desc_ctx(desc);
128         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
129         struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
130         struct nx_sg *in_sg, *out_sg;
131         int rc;
132
133         if (NX_CPB_FDM(csbcpb) & NX_FDM_CONTINUATION) {
134                 /* we've hit the nx chip previously, now we're finalizing,
135                  * so copy over the partial digest */
136                 memcpy(csbcpb->cpb.sha256.input_partial_digest,
137                        csbcpb->cpb.sha256.message_digest, SHA256_DIGEST_SIZE);
138         }
139
140         /* final is represented by continuing the operation and indicating that
141          * this is not an intermediate operation */
142         NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
143
144         csbcpb->cpb.sha256.message_bit_length += (u64)(sctx->count * 8);
145
146         in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *)sctx->buf,
147                                  sctx->count, nx_ctx->ap->sglen);
148         out_sg = nx_build_sg_list(nx_ctx->out_sg, out, SHA256_DIGEST_SIZE,
149                                   nx_ctx->ap->sglen);
150         nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) * sizeof(struct nx_sg);
151         nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg);
152
153         if (!nx_ctx->op.outlen) {
154                 rc = -EINVAL;
155                 goto out;
156         }
157
158         rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
159                            desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
160         if (rc)
161                 goto out;
162
163         atomic_inc(&(nx_ctx->stats->sha256_ops));
164
165         atomic64_add(csbcpb->cpb.sha256.message_bit_length,
166                      &(nx_ctx->stats->sha256_bytes));
167         memcpy(out, csbcpb->cpb.sha256.message_digest, SHA256_DIGEST_SIZE);
168 out:
169         return rc;
170 }
171
172 static int nx_sha256_export(struct shash_desc *desc, void *out)
173 {
174         struct sha256_state *sctx = shash_desc_ctx(desc);
175         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
176         struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
177         struct sha256_state *octx = out;
178
179         octx->count = sctx->count +
180                       (csbcpb->cpb.sha256.message_bit_length / 8);
181         memcpy(octx->buf, sctx->buf, sizeof(octx->buf));
182
183         /* if no data has been processed yet, we need to export SHA256's
184          * initial data, in case this context gets imported into a software
185          * context */
186         if (csbcpb->cpb.sha256.message_bit_length)
187                 memcpy(octx->state, csbcpb->cpb.sha256.message_digest,
188                        SHA256_DIGEST_SIZE);
189         else {
190                 octx->state[0] = SHA256_H0;
191                 octx->state[1] = SHA256_H1;
192                 octx->state[2] = SHA256_H2;
193                 octx->state[3] = SHA256_H3;
194                 octx->state[4] = SHA256_H4;
195                 octx->state[5] = SHA256_H5;
196                 octx->state[6] = SHA256_H6;
197                 octx->state[7] = SHA256_H7;
198         }
199
200         return 0;
201 }
202
203 static int nx_sha256_import(struct shash_desc *desc, const void *in)
204 {
205         struct sha256_state *sctx = shash_desc_ctx(desc);
206         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
207         struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
208         const struct sha256_state *ictx = in;
209
210         memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
211
212         sctx->count = ictx->count & 0x3f;
213         csbcpb->cpb.sha256.message_bit_length = (ictx->count & ~0x3f) * 8;
214
215         if (csbcpb->cpb.sha256.message_bit_length) {
216                 memcpy(csbcpb->cpb.sha256.message_digest, ictx->state,
217                        SHA256_DIGEST_SIZE);
218
219                 NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
220                 NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
221         }
222
223         return 0;
224 }
225
226 struct shash_alg nx_shash_sha256_alg = {
227         .digestsize = SHA256_DIGEST_SIZE,
228         .init       = nx_sha256_init,
229         .update     = nx_sha256_update,
230         .final      = nx_sha256_final,
231         .export     = nx_sha256_export,
232         .import     = nx_sha256_import,
233         .descsize   = sizeof(struct sha256_state),
234         .statesize  = sizeof(struct sha256_state),
235         .base       = {
236                 .cra_name        = "sha256",
237                 .cra_driver_name = "sha256-nx",
238                 .cra_priority    = 300,
239                 .cra_flags       = CRYPTO_ALG_TYPE_SHASH,
240                 .cra_blocksize   = SHA256_BLOCK_SIZE,
241                 .cra_module      = THIS_MODULE,
242                 .cra_ctxsize     = sizeof(struct nx_crypto_ctx),
243                 .cra_init        = nx_crypto_ctx_sha_init,
244                 .cra_exit        = nx_crypto_ctx_exit,
245         }
246 };