2 * SHA-256 routines supporting the Power 7+ Nest Accelerators driver
4 * Copyright (C) 2011-2012 International Business Machines Inc.
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.
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.
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.
19 * Author: Kent Yoder <yoder1@us.ibm.com>
22 #include <crypto/internal/hash.h>
23 #include <crypto/sha.h>
24 #include <linux/module.h>
27 #include "nx_csbcpb.h"
31 static int nx_sha256_init(struct shash_desc *desc)
33 struct sha256_state *sctx = shash_desc_ctx(desc);
34 struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
37 nx_ctx_init(nx_ctx, HCOP_FC_SHA);
39 memset(sctx, 0, sizeof *sctx);
41 nx_ctx->ap = &nx_ctx->props[NX_PROPS_SHA256];
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);
51 static int nx_sha256_update(struct shash_desc *desc, const u8 *data,
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;
58 u64 to_process, leftover, total;
62 /* 2 cases for total data len:
63 * 1: < SHA256_BLOCK_SIZE: copy into state, return 0
64 * 2: >= SHA256_BLOCK_SIZE: process X blocks, copy in leftover
66 total = sctx->count + len;
67 if (total < SHA256_BLOCK_SIZE) {
68 memcpy(sctx->buf + sctx->count, data, len);
73 in_sg = nx_ctx->in_sg;
74 max_sg_len = min_t(u32, nx_driver.of.max_sg_len/sizeof(struct nx_sg),
79 * to_process: the SHA256_BLOCK_SIZE data chunk to process in
80 * this update. This value is also restricted by the sg list
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;
90 in_sg = nx_build_sg_list(nx_ctx->in_sg,
92 sctx->count, max_sg_len);
94 in_sg = nx_build_sg_list(in_sg, (u8 *) data,
95 to_process - sctx->count,
97 nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) *
100 if (NX_CPB_FDM(csbcpb) & NX_FDM_CONTINUATION) {
102 * we've hit the nx chip previously and we're updating
103 * again, so copy over the partial digest.
105 memcpy(csbcpb->cpb.sha256.input_partial_digest,
106 csbcpb->cpb.sha256.message_digest,
110 NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
111 if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
116 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
117 desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
121 atomic_inc(&(nx_ctx->stats->sha256_ops));
122 csbcpb->cpb.sha256.message_bit_length += (u64)
123 (csbcpb->cpb.sha256.spbc * 8);
125 /* everything after the first update is continuation */
126 NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
131 in_sg = nx_ctx->in_sg;
132 } while (leftover >= SHA256_BLOCK_SIZE);
134 /* copy the leftover back into the state struct */
136 memcpy(sctx->buf, data, leftover);
137 sctx->count = leftover;
142 static int nx_sha256_final(struct shash_desc *desc, u8 *out)
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;
151 max_sg_len = min_t(u32, nx_driver.of.max_sg_len, nx_ctx->ap->sglen);
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);
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;
164 csbcpb->cpb.sha256.message_bit_length += (u64)(sctx->count * 8);
166 in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *)sctx->buf,
167 sctx->count, max_sg_len);
168 out_sg = nx_build_sg_list(nx_ctx->out_sg, out, SHA256_DIGEST_SIZE,
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);
173 if (!nx_ctx->op.outlen) {
178 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
179 desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
183 atomic_inc(&(nx_ctx->stats->sha256_ops));
185 atomic64_add(csbcpb->cpb.sha256.message_bit_length / 8,
186 &(nx_ctx->stats->sha256_bytes));
187 memcpy(out, csbcpb->cpb.sha256.message_digest, SHA256_DIGEST_SIZE);
192 static int nx_sha256_export(struct shash_desc *desc, void *out)
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;
199 octx->count = sctx->count +
200 (csbcpb->cpb.sha256.message_bit_length / 8);
201 memcpy(octx->buf, sctx->buf, sizeof(octx->buf));
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
206 if (csbcpb->cpb.sha256.message_bit_length)
207 memcpy(octx->state, csbcpb->cpb.sha256.message_digest,
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;
223 static int nx_sha256_import(struct shash_desc *desc, const void *in)
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;
230 memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
232 sctx->count = ictx->count & 0x3f;
233 csbcpb->cpb.sha256.message_bit_length = (ictx->count & ~0x3f) * 8;
235 if (csbcpb->cpb.sha256.message_bit_length) {
236 memcpy(csbcpb->cpb.sha256.message_digest, ictx->state,
239 NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
240 NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
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),
256 .cra_name = "sha256",
257 .cra_driver_name = "sha256-nx",
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,