Merge tag 'trace-v5.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt...
[linux-2.6-microblaze.git] / drivers / crypto / nx / nx-sha512.c
1 /**
2  * SHA-512 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_crypto_ctx_sha512_init(struct crypto_tfm *tfm)
32 {
33         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm);
34         int err;
35
36         err = nx_crypto_ctx_sha_init(tfm);
37         if (err)
38                 return err;
39
40         nx_ctx_init(nx_ctx, HCOP_FC_SHA);
41
42         nx_ctx->ap = &nx_ctx->props[NX_PROPS_SHA512];
43
44         NX_CPB_SET_DIGEST_SIZE(nx_ctx->csbcpb, NX_DS_SHA512);
45
46         return 0;
47 }
48
49 static int nx_sha512_init(struct shash_desc *desc)
50 {
51         struct sha512_state *sctx = shash_desc_ctx(desc);
52
53         memset(sctx, 0, sizeof *sctx);
54
55         sctx->state[0] = __cpu_to_be64(SHA512_H0);
56         sctx->state[1] = __cpu_to_be64(SHA512_H1);
57         sctx->state[2] = __cpu_to_be64(SHA512_H2);
58         sctx->state[3] = __cpu_to_be64(SHA512_H3);
59         sctx->state[4] = __cpu_to_be64(SHA512_H4);
60         sctx->state[5] = __cpu_to_be64(SHA512_H5);
61         sctx->state[6] = __cpu_to_be64(SHA512_H6);
62         sctx->state[7] = __cpu_to_be64(SHA512_H7);
63         sctx->count[0] = 0;
64
65         return 0;
66 }
67
68 static int nx_sha512_update(struct shash_desc *desc, const u8 *data,
69                             unsigned int len)
70 {
71         struct sha512_state *sctx = shash_desc_ctx(desc);
72         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
73         struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
74         struct nx_sg *out_sg;
75         u64 to_process, leftover = 0, total;
76         unsigned long irq_flags;
77         int rc = 0;
78         int data_len;
79         u32 max_sg_len;
80         u64 buf_len = (sctx->count[0] % SHA512_BLOCK_SIZE);
81
82         spin_lock_irqsave(&nx_ctx->lock, irq_flags);
83
84         /* 2 cases for total data len:
85          *  1: < SHA512_BLOCK_SIZE: copy into state, return 0
86          *  2: >= SHA512_BLOCK_SIZE: process X blocks, copy in leftover
87          */
88         total = (sctx->count[0] % SHA512_BLOCK_SIZE) + len;
89         if (total < SHA512_BLOCK_SIZE) {
90                 memcpy(sctx->buf + buf_len, data, len);
91                 sctx->count[0] += len;
92                 goto out;
93         }
94
95         memcpy(csbcpb->cpb.sha512.message_digest, sctx->state, SHA512_DIGEST_SIZE);
96         NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
97         NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
98
99         max_sg_len = min_t(u64, nx_ctx->ap->sglen,
100                         nx_driver.of.max_sg_len/sizeof(struct nx_sg));
101         max_sg_len = min_t(u64, max_sg_len,
102                         nx_ctx->ap->databytelen/NX_PAGE_SIZE);
103
104         data_len = SHA512_DIGEST_SIZE;
105         out_sg = nx_build_sg_list(nx_ctx->out_sg, (u8 *)sctx->state,
106                                   &data_len, max_sg_len);
107         nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg);
108
109         if (data_len != SHA512_DIGEST_SIZE) {
110                 rc = -EINVAL;
111                 goto out;
112         }
113
114         do {
115                 int used_sgs = 0;
116                 struct nx_sg *in_sg = nx_ctx->in_sg;
117
118                 if (buf_len) {
119                         data_len = buf_len;
120                         in_sg = nx_build_sg_list(in_sg,
121                                                  (u8 *) sctx->buf,
122                                                  &data_len, max_sg_len);
123
124                         if (data_len != buf_len) {
125                                 rc = -EINVAL;
126                                 goto out;
127                         }
128                         used_sgs = in_sg - nx_ctx->in_sg;
129                 }
130
131                 /* to_process: SHA512_BLOCK_SIZE aligned chunk to be
132                  * processed in this iteration. This value is restricted
133                  * by sg list limits and number of sgs we already used
134                  * for leftover data. (see above)
135                  * In ideal case, we could allow NX_PAGE_SIZE * max_sg_len,
136                  * but because data may not be aligned, we need to account
137                  * for that too. */
138                 to_process = min_t(u64, total,
139                         (max_sg_len - 1 - used_sgs) * NX_PAGE_SIZE);
140                 to_process = to_process & ~(SHA512_BLOCK_SIZE - 1);
141
142                 data_len = to_process - buf_len;
143                 in_sg = nx_build_sg_list(in_sg, (u8 *) data,
144                                          &data_len, max_sg_len);
145
146                 nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) * sizeof(struct nx_sg);
147
148                 if (data_len != (to_process - buf_len)) {
149                         rc = -EINVAL;
150                         goto out;
151                 }
152
153                 to_process = data_len + buf_len;
154                 leftover = total - to_process;
155
156                 /*
157                  * we've hit the nx chip previously and we're updating
158                  * again, so copy over the partial digest.
159                  */
160                 memcpy(csbcpb->cpb.sha512.input_partial_digest,
161                                csbcpb->cpb.sha512.message_digest,
162                                SHA512_DIGEST_SIZE);
163
164                 if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
165                         rc = -EINVAL;
166                         goto out;
167                 }
168
169                 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, 0);
170                 if (rc)
171                         goto out;
172
173                 atomic_inc(&(nx_ctx->stats->sha512_ops));
174
175                 total -= to_process;
176                 data += to_process - buf_len;
177                 buf_len = 0;
178
179         } while (leftover >= SHA512_BLOCK_SIZE);
180
181         /* copy the leftover back into the state struct */
182         if (leftover)
183                 memcpy(sctx->buf, data, leftover);
184         sctx->count[0] += len;
185         memcpy(sctx->state, csbcpb->cpb.sha512.message_digest, SHA512_DIGEST_SIZE);
186 out:
187         spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
188         return rc;
189 }
190
191 static int nx_sha512_final(struct shash_desc *desc, u8 *out)
192 {
193         struct sha512_state *sctx = shash_desc_ctx(desc);
194         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
195         struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
196         struct nx_sg *in_sg, *out_sg;
197         u32 max_sg_len;
198         u64 count0;
199         unsigned long irq_flags;
200         int rc = 0;
201         int len;
202
203         spin_lock_irqsave(&nx_ctx->lock, irq_flags);
204
205         max_sg_len = min_t(u64, nx_ctx->ap->sglen,
206                         nx_driver.of.max_sg_len/sizeof(struct nx_sg));
207         max_sg_len = min_t(u64, max_sg_len,
208                         nx_ctx->ap->databytelen/NX_PAGE_SIZE);
209
210         /* final is represented by continuing the operation and indicating that
211          * this is not an intermediate operation */
212         if (sctx->count[0] >= SHA512_BLOCK_SIZE) {
213                 /* we've hit the nx chip previously, now we're finalizing,
214                  * so copy over the partial digest */
215                 memcpy(csbcpb->cpb.sha512.input_partial_digest, sctx->state,
216                                                         SHA512_DIGEST_SIZE);
217                 NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
218                 NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
219         } else {
220                 NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
221                 NX_CPB_FDM(csbcpb) &= ~NX_FDM_CONTINUATION;
222         }
223
224         NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
225
226         count0 = sctx->count[0] * 8;
227
228         csbcpb->cpb.sha512.message_bit_length_lo = count0;
229
230         len = sctx->count[0] & (SHA512_BLOCK_SIZE - 1);
231         in_sg = nx_build_sg_list(nx_ctx->in_sg, sctx->buf, &len,
232                                  max_sg_len);
233
234         if (len != (sctx->count[0] & (SHA512_BLOCK_SIZE - 1))) {
235                 rc = -EINVAL;
236                 goto out;
237         }
238
239         len = SHA512_DIGEST_SIZE;
240         out_sg = nx_build_sg_list(nx_ctx->out_sg, out, &len,
241                                  max_sg_len);
242
243         nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) * sizeof(struct nx_sg);
244         nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg);
245
246         if (!nx_ctx->op.outlen) {
247                 rc = -EINVAL;
248                 goto out;
249         }
250
251         rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, 0);
252         if (rc)
253                 goto out;
254
255         atomic_inc(&(nx_ctx->stats->sha512_ops));
256         atomic64_add(sctx->count[0], &(nx_ctx->stats->sha512_bytes));
257
258         memcpy(out, csbcpb->cpb.sha512.message_digest, SHA512_DIGEST_SIZE);
259 out:
260         spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
261         return rc;
262 }
263
264 static int nx_sha512_export(struct shash_desc *desc, void *out)
265 {
266         struct sha512_state *sctx = shash_desc_ctx(desc);
267
268         memcpy(out, sctx, sizeof(*sctx));
269
270         return 0;
271 }
272
273 static int nx_sha512_import(struct shash_desc *desc, const void *in)
274 {
275         struct sha512_state *sctx = shash_desc_ctx(desc);
276
277         memcpy(sctx, in, sizeof(*sctx));
278
279         return 0;
280 }
281
282 struct shash_alg nx_shash_sha512_alg = {
283         .digestsize = SHA512_DIGEST_SIZE,
284         .init       = nx_sha512_init,
285         .update     = nx_sha512_update,
286         .final      = nx_sha512_final,
287         .export     = nx_sha512_export,
288         .import     = nx_sha512_import,
289         .descsize   = sizeof(struct sha512_state),
290         .statesize  = sizeof(struct sha512_state),
291         .base       = {
292                 .cra_name        = "sha512",
293                 .cra_driver_name = "sha512-nx",
294                 .cra_priority    = 300,
295                 .cra_blocksize   = SHA512_BLOCK_SIZE,
296                 .cra_module      = THIS_MODULE,
297                 .cra_ctxsize     = sizeof(struct nx_crypto_ctx),
298                 .cra_init        = nx_crypto_ctx_sha512_init,
299                 .cra_exit        = nx_crypto_ctx_exit,
300         }
301 };