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-rw-r--r--drivers/crypto/nx/nx-sha256.c246
1 files changed, 246 insertions, 0 deletions
diff --git a/drivers/crypto/nx/nx-sha256.c b/drivers/crypto/nx/nx-sha256.c
new file mode 100644
index 000000000000..9767315f8c0b
--- /dev/null
+++ b/drivers/crypto/nx/nx-sha256.c
@@ -0,0 +1,246 @@
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
31static 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
51static 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;
121out:
122 return rc;
123}
124
125static 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);
168out:
169 return rc;
170}
171
172static 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
203static 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
226struct 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};
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-10 12:53:54 -0500