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528e3962 KY |
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; | |
d3111493 MC |
58 | u64 to_process, leftover, total; |
59 | u32 max_sg_len; | |
528e3962 KY |
60 | int rc = 0; |
61 | ||
528e3962 | 62 | /* 2 cases for total data len: |
d3111493 MC |
63 | * 1: < SHA256_BLOCK_SIZE: copy into state, return 0 |
64 | * 2: >= SHA256_BLOCK_SIZE: process X blocks, copy in leftover | |
528e3962 | 65 | */ |
d3111493 MC |
66 | total = sctx->count + len; |
67 | if (total < SHA256_BLOCK_SIZE) { | |
528e3962 KY |
68 | memcpy(sctx->buf + sctx->count, data, len); |
69 | sctx->count += len; | |
70 | goto out; | |
71 | } | |
72 | ||
d3111493 MC |
73 | in_sg = nx_ctx->in_sg; |
74 | max_sg_len = min_t(u32, nx_driver.of.max_sg_len/sizeof(struct nx_sg), | |
75 | nx_ctx->ap->sglen); | |
76 | ||
77 | do { | |
78 | /* | |
79 | * to_process: the SHA256_BLOCK_SIZE data chunk to process in | |
80 | * this update. This value is also restricted by the sg list | |
81 | * limits. | |
82 | */ | |
83 | to_process = min_t(u64, total, nx_ctx->ap->databytelen); | |
84 | to_process = min_t(u64, to_process, | |
85 | NX_PAGE_SIZE * (max_sg_len - 1)); | |
86 | to_process = to_process & ~(SHA256_BLOCK_SIZE - 1); | |
87 | leftover = total - to_process; | |
88 | ||
89 | if (sctx->count) { | |
90 | in_sg = nx_build_sg_list(nx_ctx->in_sg, | |
91 | (u8 *) sctx->buf, | |
92 | sctx->count, max_sg_len); | |
93 | } | |
94 | in_sg = nx_build_sg_list(in_sg, (u8 *) data, | |
528e3962 | 95 | to_process - sctx->count, |
d3111493 | 96 | max_sg_len); |
528e3962 KY |
97 | nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) * |
98 | sizeof(struct nx_sg); | |
528e3962 | 99 | |
d3111493 MC |
100 | if (NX_CPB_FDM(csbcpb) & NX_FDM_CONTINUATION) { |
101 | /* | |
102 | * we've hit the nx chip previously and we're updating | |
103 | * again, so copy over the partial digest. | |
104 | */ | |
105 | memcpy(csbcpb->cpb.sha256.input_partial_digest, | |
106 | csbcpb->cpb.sha256.message_digest, | |
107 | SHA256_DIGEST_SIZE); | |
108 | } | |
109 | ||
110 | NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE; | |
111 | if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) { | |
112 | rc = -EINVAL; | |
113 | goto out; | |
114 | } | |
115 | ||
116 | rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, | |
117 | desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP); | |
118 | if (rc) | |
119 | goto out; | |
120 | ||
121 | atomic_inc(&(nx_ctx->stats->sha256_ops)); | |
122 | csbcpb->cpb.sha256.message_bit_length += (u64) | |
123 | (csbcpb->cpb.sha256.spbc * 8); | |
124 | ||
125 | /* everything after the first update is continuation */ | |
126 | NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION; | |
127 | ||
128 | total -= to_process; | |
129 | data += to_process; | |
130 | sctx->count = 0; | |
131 | in_sg = nx_ctx->in_sg; | |
132 | } while (leftover >= SHA256_BLOCK_SIZE); | |
528e3962 KY |
133 | |
134 | /* copy the leftover back into the state struct */ | |
1ad936e8 | 135 | if (leftover) |
d3111493 | 136 | memcpy(sctx->buf, data, leftover); |
528e3962 | 137 | sctx->count = leftover; |
528e3962 KY |
138 | out: |
139 | return rc; | |
140 | } | |
141 | ||
142 | static int nx_sha256_final(struct shash_desc *desc, u8 *out) | |
143 | { | |
144 | struct sha256_state *sctx = shash_desc_ctx(desc); | |
145 | struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base); | |
146 | struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb; | |
147 | struct nx_sg *in_sg, *out_sg; | |
d3111493 | 148 | u32 max_sg_len; |
528e3962 KY |
149 | int rc; |
150 | ||
d3111493 | 151 | max_sg_len = min_t(u32, nx_driver.of.max_sg_len, nx_ctx->ap->sglen); |
1ad936e8 | 152 | |
528e3962 KY |
153 | if (NX_CPB_FDM(csbcpb) & NX_FDM_CONTINUATION) { |
154 | /* we've hit the nx chip previously, now we're finalizing, | |
155 | * so copy over the partial digest */ | |
156 | memcpy(csbcpb->cpb.sha256.input_partial_digest, | |
157 | csbcpb->cpb.sha256.message_digest, SHA256_DIGEST_SIZE); | |
158 | } | |
159 | ||
160 | /* final is represented by continuing the operation and indicating that | |
161 | * this is not an intermediate operation */ | |
162 | NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE; | |
163 | ||
164 | csbcpb->cpb.sha256.message_bit_length += (u64)(sctx->count * 8); | |
165 | ||
166 | in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *)sctx->buf, | |
d3111493 | 167 | sctx->count, max_sg_len); |
528e3962 | 168 | out_sg = nx_build_sg_list(nx_ctx->out_sg, out, SHA256_DIGEST_SIZE, |
d3111493 | 169 | max_sg_len); |
528e3962 KY |
170 | nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) * sizeof(struct nx_sg); |
171 | nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg); | |
172 | ||
173 | if (!nx_ctx->op.outlen) { | |
174 | rc = -EINVAL; | |
175 | goto out; | |
176 | } | |
177 | ||
178 | rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, | |
179 | desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP); | |
180 | if (rc) | |
181 | goto out; | |
182 | ||
183 | atomic_inc(&(nx_ctx->stats->sha256_ops)); | |
184 | ||
1ad936e8 | 185 | atomic64_add(csbcpb->cpb.sha256.message_bit_length / 8, |
528e3962 KY |
186 | &(nx_ctx->stats->sha256_bytes)); |
187 | memcpy(out, csbcpb->cpb.sha256.message_digest, SHA256_DIGEST_SIZE); | |
188 | out: | |
189 | return rc; | |
190 | } | |
191 | ||
192 | static int nx_sha256_export(struct shash_desc *desc, void *out) | |
193 | { | |
194 | struct sha256_state *sctx = shash_desc_ctx(desc); | |
195 | struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base); | |
196 | struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb; | |
197 | struct sha256_state *octx = out; | |
198 | ||
199 | octx->count = sctx->count + | |
200 | (csbcpb->cpb.sha256.message_bit_length / 8); | |
201 | memcpy(octx->buf, sctx->buf, sizeof(octx->buf)); | |
202 | ||
203 | /* if no data has been processed yet, we need to export SHA256's | |
204 | * initial data, in case this context gets imported into a software | |
205 | * context */ | |
206 | if (csbcpb->cpb.sha256.message_bit_length) | |
207 | memcpy(octx->state, csbcpb->cpb.sha256.message_digest, | |
208 | SHA256_DIGEST_SIZE); | |
209 | else { | |
210 | octx->state[0] = SHA256_H0; | |
211 | octx->state[1] = SHA256_H1; | |
212 | octx->state[2] = SHA256_H2; | |
213 | octx->state[3] = SHA256_H3; | |
214 | octx->state[4] = SHA256_H4; | |
215 | octx->state[5] = SHA256_H5; | |
216 | octx->state[6] = SHA256_H6; | |
217 | octx->state[7] = SHA256_H7; | |
218 | } | |
219 | ||
220 | return 0; | |
221 | } | |
222 | ||
223 | static int nx_sha256_import(struct shash_desc *desc, const void *in) | |
224 | { | |
225 | struct sha256_state *sctx = shash_desc_ctx(desc); | |
226 | struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base); | |
227 | struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb; | |
228 | const struct sha256_state *ictx = in; | |
229 | ||
230 | memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf)); | |
231 | ||
232 | sctx->count = ictx->count & 0x3f; | |
233 | csbcpb->cpb.sha256.message_bit_length = (ictx->count & ~0x3f) * 8; | |
234 | ||
235 | if (csbcpb->cpb.sha256.message_bit_length) { | |
236 | memcpy(csbcpb->cpb.sha256.message_digest, ictx->state, | |
237 | SHA256_DIGEST_SIZE); | |
238 | ||
239 | NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION; | |
240 | NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE; | |
241 | } | |
242 | ||
243 | return 0; | |
244 | } | |
245 | ||
246 | struct shash_alg nx_shash_sha256_alg = { | |
247 | .digestsize = SHA256_DIGEST_SIZE, | |
248 | .init = nx_sha256_init, | |
249 | .update = nx_sha256_update, | |
250 | .final = nx_sha256_final, | |
251 | .export = nx_sha256_export, | |
252 | .import = nx_sha256_import, | |
253 | .descsize = sizeof(struct sha256_state), | |
254 | .statesize = sizeof(struct sha256_state), | |
255 | .base = { | |
256 | .cra_name = "sha256", | |
257 | .cra_driver_name = "sha256-nx", | |
258 | .cra_priority = 300, | |
259 | .cra_flags = CRYPTO_ALG_TYPE_SHASH, | |
260 | .cra_blocksize = SHA256_BLOCK_SIZE, | |
261 | .cra_module = THIS_MODULE, | |
262 | .cra_ctxsize = sizeof(struct nx_crypto_ctx), | |
263 | .cra_init = nx_crypto_ctx_sha_init, | |
264 | .cra_exit = nx_crypto_ctx_exit, | |
265 | } | |
266 | }; |