Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
[linux-2.6-microblaze.git] / drivers / crypto / nx / nx-sha256.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * SHA-256 routines supporting the Power 7+ Nest Accelerators driver
4  *
5  * Copyright (C) 2011-2012 International Business Machines Inc.
6  *
7  * Author: Kent Yoder <yoder1@us.ibm.com>
8  */
9
10 #include <crypto/internal/hash.h>
11 #include <crypto/sha2.h>
12 #include <linux/module.h>
13 #include <asm/vio.h>
14 #include <asm/byteorder.h>
15
16 #include "nx_csbcpb.h"
17 #include "nx.h"
18
19 struct sha256_state_be {
20         __be32 state[SHA256_DIGEST_SIZE / 4];
21         u64 count;
22         u8 buf[SHA256_BLOCK_SIZE];
23 };
24
25 static int nx_crypto_ctx_sha256_init(struct crypto_tfm *tfm)
26 {
27         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm);
28         int err;
29
30         err = nx_crypto_ctx_sha_init(tfm);
31         if (err)
32                 return err;
33
34         nx_ctx_init(nx_ctx, HCOP_FC_SHA);
35
36         nx_ctx->ap = &nx_ctx->props[NX_PROPS_SHA256];
37
38         NX_CPB_SET_DIGEST_SIZE(nx_ctx->csbcpb, NX_DS_SHA256);
39
40         return 0;
41 }
42
43 static int nx_sha256_init(struct shash_desc *desc) {
44         struct sha256_state_be *sctx = shash_desc_ctx(desc);
45
46         memset(sctx, 0, sizeof *sctx);
47
48         sctx->state[0] = __cpu_to_be32(SHA256_H0);
49         sctx->state[1] = __cpu_to_be32(SHA256_H1);
50         sctx->state[2] = __cpu_to_be32(SHA256_H2);
51         sctx->state[3] = __cpu_to_be32(SHA256_H3);
52         sctx->state[4] = __cpu_to_be32(SHA256_H4);
53         sctx->state[5] = __cpu_to_be32(SHA256_H5);
54         sctx->state[6] = __cpu_to_be32(SHA256_H6);
55         sctx->state[7] = __cpu_to_be32(SHA256_H7);
56         sctx->count = 0;
57
58         return 0;
59 }
60
61 static int nx_sha256_update(struct shash_desc *desc, const u8 *data,
62                             unsigned int len)
63 {
64         struct sha256_state_be *sctx = shash_desc_ctx(desc);
65         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
66         struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
67         struct nx_sg *out_sg;
68         u64 to_process = 0, leftover, total;
69         unsigned long irq_flags;
70         int rc = 0;
71         int data_len;
72         u32 max_sg_len;
73         u64 buf_len = (sctx->count % SHA256_BLOCK_SIZE);
74
75         spin_lock_irqsave(&nx_ctx->lock, irq_flags);
76
77         /* 2 cases for total data len:
78          *  1: < SHA256_BLOCK_SIZE: copy into state, return 0
79          *  2: >= SHA256_BLOCK_SIZE: process X blocks, copy in leftover
80          */
81         total = (sctx->count % SHA256_BLOCK_SIZE) + len;
82         if (total < SHA256_BLOCK_SIZE) {
83                 memcpy(sctx->buf + buf_len, data, len);
84                 sctx->count += len;
85                 goto out;
86         }
87
88         memcpy(csbcpb->cpb.sha256.message_digest, sctx->state, SHA256_DIGEST_SIZE);
89         NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
90         NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
91
92         max_sg_len = min_t(u64, nx_ctx->ap->sglen,
93                         nx_driver.of.max_sg_len/sizeof(struct nx_sg));
94         max_sg_len = min_t(u64, max_sg_len,
95                         nx_ctx->ap->databytelen/NX_PAGE_SIZE);
96
97         data_len = SHA256_DIGEST_SIZE;
98         out_sg = nx_build_sg_list(nx_ctx->out_sg, (u8 *)sctx->state,
99                                   &data_len, max_sg_len);
100         nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg);
101
102         if (data_len != SHA256_DIGEST_SIZE) {
103                 rc = -EINVAL;
104                 goto out;
105         }
106
107         do {
108                 int used_sgs = 0;
109                 struct nx_sg *in_sg = nx_ctx->in_sg;
110
111                 if (buf_len) {
112                         data_len = buf_len;
113                         in_sg = nx_build_sg_list(in_sg,
114                                                  (u8 *) sctx->buf,
115                                                  &data_len,
116                                                  max_sg_len);
117
118                         if (data_len != buf_len) {
119                                 rc = -EINVAL;
120                                 goto out;
121                         }
122                         used_sgs = in_sg - nx_ctx->in_sg;
123                 }
124
125                 /* to_process: SHA256_BLOCK_SIZE aligned chunk to be
126                  * processed in this iteration. This value is restricted
127                  * by sg list limits and number of sgs we already used
128                  * for leftover data. (see above)
129                  * In ideal case, we could allow NX_PAGE_SIZE * max_sg_len,
130                  * but because data may not be aligned, we need to account
131                  * for that too. */
132                 to_process = min_t(u64, total,
133                         (max_sg_len - 1 - used_sgs) * NX_PAGE_SIZE);
134                 to_process = to_process & ~(SHA256_BLOCK_SIZE - 1);
135
136                 data_len = to_process - buf_len;
137                 in_sg = nx_build_sg_list(in_sg, (u8 *) data,
138                                          &data_len, max_sg_len);
139
140                 nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) * sizeof(struct nx_sg);
141
142                 to_process = data_len + buf_len;
143                 leftover = total - to_process;
144
145                 /*
146                  * we've hit the nx chip previously and we're updating
147                  * again, so copy over the partial digest.
148                  */
149                 memcpy(csbcpb->cpb.sha256.input_partial_digest,
150                                csbcpb->cpb.sha256.message_digest,
151                                SHA256_DIGEST_SIZE);
152
153                 if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
154                         rc = -EINVAL;
155                         goto out;
156                 }
157
158                 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, 0);
159                 if (rc)
160                         goto out;
161
162                 atomic_inc(&(nx_ctx->stats->sha256_ops));
163
164                 total -= to_process;
165                 data += to_process - buf_len;
166                 buf_len = 0;
167
168         } while (leftover >= SHA256_BLOCK_SIZE);
169
170         /* copy the leftover back into the state struct */
171         if (leftover)
172                 memcpy(sctx->buf, data, leftover);
173
174         sctx->count += len;
175         memcpy(sctx->state, csbcpb->cpb.sha256.message_digest, SHA256_DIGEST_SIZE);
176 out:
177         spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
178         return rc;
179 }
180
181 static int nx_sha256_final(struct shash_desc *desc, u8 *out)
182 {
183         struct sha256_state_be *sctx = shash_desc_ctx(desc);
184         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
185         struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
186         struct nx_sg *in_sg, *out_sg;
187         unsigned long irq_flags;
188         u32 max_sg_len;
189         int rc = 0;
190         int len;
191
192         spin_lock_irqsave(&nx_ctx->lock, irq_flags);
193
194         max_sg_len = min_t(u64, nx_ctx->ap->sglen,
195                         nx_driver.of.max_sg_len/sizeof(struct nx_sg));
196         max_sg_len = min_t(u64, max_sg_len,
197                         nx_ctx->ap->databytelen/NX_PAGE_SIZE);
198
199         /* final is represented by continuing the operation and indicating that
200          * this is not an intermediate operation */
201         if (sctx->count >= SHA256_BLOCK_SIZE) {
202                 /* we've hit the nx chip previously, now we're finalizing,
203                  * so copy over the partial digest */
204                 memcpy(csbcpb->cpb.sha256.input_partial_digest, sctx->state, SHA256_DIGEST_SIZE);
205                 NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
206                 NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
207         } else {
208                 NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
209                 NX_CPB_FDM(csbcpb) &= ~NX_FDM_CONTINUATION;
210         }
211
212         csbcpb->cpb.sha256.message_bit_length = (u64) (sctx->count * 8);
213
214         len = sctx->count & (SHA256_BLOCK_SIZE - 1);
215         in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *) sctx->buf,
216                                  &len, max_sg_len);
217
218         if (len != (sctx->count & (SHA256_BLOCK_SIZE - 1))) {
219                 rc = -EINVAL;
220                 goto out;
221         }
222
223         len = SHA256_DIGEST_SIZE;
224         out_sg = nx_build_sg_list(nx_ctx->out_sg, out, &len, max_sg_len);
225
226         if (len != SHA256_DIGEST_SIZE) {
227                 rc = -EINVAL;
228                 goto out;
229         }
230
231         nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) * sizeof(struct nx_sg);
232         nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg);
233         if (!nx_ctx->op.outlen) {
234                 rc = -EINVAL;
235                 goto out;
236         }
237
238         rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, 0);
239         if (rc)
240                 goto out;
241
242         atomic_inc(&(nx_ctx->stats->sha256_ops));
243
244         atomic64_add(sctx->count, &(nx_ctx->stats->sha256_bytes));
245         memcpy(out, csbcpb->cpb.sha256.message_digest, SHA256_DIGEST_SIZE);
246 out:
247         spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
248         return rc;
249 }
250
251 static int nx_sha256_export(struct shash_desc *desc, void *out)
252 {
253         struct sha256_state_be *sctx = shash_desc_ctx(desc);
254
255         memcpy(out, sctx, sizeof(*sctx));
256
257         return 0;
258 }
259
260 static int nx_sha256_import(struct shash_desc *desc, const void *in)
261 {
262         struct sha256_state_be *sctx = shash_desc_ctx(desc);
263
264         memcpy(sctx, in, sizeof(*sctx));
265
266         return 0;
267 }
268
269 struct shash_alg nx_shash_sha256_alg = {
270         .digestsize = SHA256_DIGEST_SIZE,
271         .init       = nx_sha256_init,
272         .update     = nx_sha256_update,
273         .final      = nx_sha256_final,
274         .export     = nx_sha256_export,
275         .import     = nx_sha256_import,
276         .descsize   = sizeof(struct sha256_state_be),
277         .statesize  = sizeof(struct sha256_state_be),
278         .base       = {
279                 .cra_name        = "sha256",
280                 .cra_driver_name = "sha256-nx",
281                 .cra_priority    = 300,
282                 .cra_blocksize   = SHA256_BLOCK_SIZE,
283                 .cra_module      = THIS_MODULE,
284                 .cra_ctxsize     = sizeof(struct nx_crypto_ctx),
285                 .cra_init        = nx_crypto_ctx_sha256_init,
286                 .cra_exit        = nx_crypto_ctx_exit,
287         }
288 };