rwsem: fix commas in initialisation
[linux-2.6-microblaze.git] / crypto / blake2b_generic.c
1 // SPDX-License-Identifier: (GPL-2.0-only OR Apache-2.0)
2 /*
3  * BLAKE2b reference source code package - reference C implementations
4  *
5  * Copyright 2012, Samuel Neves <sneves@dei.uc.pt>.  You may use this under the
6  * terms of the CC0, the OpenSSL Licence, or the Apache Public License 2.0, at
7  * your option.  The terms of these licenses can be found at:
8  *
9  * - CC0 1.0 Universal : http://creativecommons.org/publicdomain/zero/1.0
10  * - OpenSSL license   : https://www.openssl.org/source/license.html
11  * - Apache 2.0        : http://www.apache.org/licenses/LICENSE-2.0
12  *
13  * More information about the BLAKE2 hash function can be found at
14  * https://blake2.net.
15  *
16  * Note: the original sources have been modified for inclusion in linux kernel
17  * in terms of coding style, using generic helpers and simplifications of error
18  * handling.
19  */
20
21 #include <asm/unaligned.h>
22 #include <linux/module.h>
23 #include <linux/string.h>
24 #include <linux/kernel.h>
25 #include <linux/bitops.h>
26 #include <crypto/internal/hash.h>
27
28 #define BLAKE2B_160_DIGEST_SIZE         (160 / 8)
29 #define BLAKE2B_256_DIGEST_SIZE         (256 / 8)
30 #define BLAKE2B_384_DIGEST_SIZE         (384 / 8)
31 #define BLAKE2B_512_DIGEST_SIZE         (512 / 8)
32
33 enum blake2b_constant {
34         BLAKE2B_BLOCKBYTES    = 128,
35         BLAKE2B_KEYBYTES      = 64,
36 };
37
38 struct blake2b_state {
39         u64      h[8];
40         u64      t[2];
41         u64      f[2];
42         u8       buf[BLAKE2B_BLOCKBYTES];
43         size_t   buflen;
44 };
45
46 static const u64 blake2b_IV[8] = {
47         0x6a09e667f3bcc908ULL, 0xbb67ae8584caa73bULL,
48         0x3c6ef372fe94f82bULL, 0xa54ff53a5f1d36f1ULL,
49         0x510e527fade682d1ULL, 0x9b05688c2b3e6c1fULL,
50         0x1f83d9abfb41bd6bULL, 0x5be0cd19137e2179ULL
51 };
52
53 static const u8 blake2b_sigma[12][16] = {
54         {  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15 },
55         { 14, 10,  4,  8,  9, 15, 13,  6,  1, 12,  0,  2, 11,  7,  5,  3 },
56         { 11,  8, 12,  0,  5,  2, 15, 13, 10, 14,  3,  6,  7,  1,  9,  4 },
57         {  7,  9,  3,  1, 13, 12, 11, 14,  2,  6,  5, 10,  4,  0, 15,  8 },
58         {  9,  0,  5,  7,  2,  4, 10, 15, 14,  1, 11, 12,  6,  8,  3, 13 },
59         {  2, 12,  6, 10,  0, 11,  8,  3,  4, 13,  7,  5, 15, 14,  1,  9 },
60         { 12,  5,  1, 15, 14, 13,  4, 10,  0,  7,  6,  3,  9,  2,  8, 11 },
61         { 13, 11,  7, 14, 12,  1,  3,  9,  5,  0, 15,  4,  8,  6,  2, 10 },
62         {  6, 15, 14,  9, 11,  3,  0,  8, 12,  2, 13,  7,  1,  4, 10,  5 },
63         { 10,  2,  8,  4,  7,  6,  1,  5, 15, 11,  9, 14,  3, 12, 13,  0 },
64         {  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15 },
65         { 14, 10,  4,  8,  9, 15, 13,  6,  1, 12,  0,  2, 11,  7,  5,  3 }
66 };
67
68 static void blake2b_increment_counter(struct blake2b_state *S, const u64 inc)
69 {
70         S->t[0] += inc;
71         S->t[1] += (S->t[0] < inc);
72 }
73
74 #define G(r,i,a,b,c,d)                                  \
75         do {                                            \
76                 a = a + b + m[blake2b_sigma[r][2*i+0]]; \
77                 d = ror64(d ^ a, 32);                   \
78                 c = c + d;                              \
79                 b = ror64(b ^ c, 24);                   \
80                 a = a + b + m[blake2b_sigma[r][2*i+1]]; \
81                 d = ror64(d ^ a, 16);                   \
82                 c = c + d;                              \
83                 b = ror64(b ^ c, 63);                   \
84         } while (0)
85
86 #define ROUND(r)                                \
87         do {                                    \
88                 G(r,0,v[ 0],v[ 4],v[ 8],v[12]); \
89                 G(r,1,v[ 1],v[ 5],v[ 9],v[13]); \
90                 G(r,2,v[ 2],v[ 6],v[10],v[14]); \
91                 G(r,3,v[ 3],v[ 7],v[11],v[15]); \
92                 G(r,4,v[ 0],v[ 5],v[10],v[15]); \
93                 G(r,5,v[ 1],v[ 6],v[11],v[12]); \
94                 G(r,6,v[ 2],v[ 7],v[ 8],v[13]); \
95                 G(r,7,v[ 3],v[ 4],v[ 9],v[14]); \
96         } while (0)
97
98 static void blake2b_compress(struct blake2b_state *S,
99                              const u8 block[BLAKE2B_BLOCKBYTES])
100 {
101         u64 m[16];
102         u64 v[16];
103         size_t i;
104
105         for (i = 0; i < 16; ++i)
106                 m[i] = get_unaligned_le64(block + i * sizeof(m[i]));
107
108         for (i = 0; i < 8; ++i)
109                 v[i] = S->h[i];
110
111         v[ 8] = blake2b_IV[0];
112         v[ 9] = blake2b_IV[1];
113         v[10] = blake2b_IV[2];
114         v[11] = blake2b_IV[3];
115         v[12] = blake2b_IV[4] ^ S->t[0];
116         v[13] = blake2b_IV[5] ^ S->t[1];
117         v[14] = blake2b_IV[6] ^ S->f[0];
118         v[15] = blake2b_IV[7] ^ S->f[1];
119
120         ROUND(0);
121         ROUND(1);
122         ROUND(2);
123         ROUND(3);
124         ROUND(4);
125         ROUND(5);
126         ROUND(6);
127         ROUND(7);
128         ROUND(8);
129         ROUND(9);
130         ROUND(10);
131         ROUND(11);
132 #ifdef CONFIG_CC_IS_CLANG
133 #pragma nounroll /* https://bugs.llvm.org/show_bug.cgi?id=45803 */
134 #endif
135         for (i = 0; i < 8; ++i)
136                 S->h[i] = S->h[i] ^ v[i] ^ v[i + 8];
137 }
138
139 #undef G
140 #undef ROUND
141
142 struct blake2b_tfm_ctx {
143         u8 key[BLAKE2B_KEYBYTES];
144         unsigned int keylen;
145 };
146
147 static int blake2b_setkey(struct crypto_shash *tfm, const u8 *key,
148                           unsigned int keylen)
149 {
150         struct blake2b_tfm_ctx *tctx = crypto_shash_ctx(tfm);
151
152         if (keylen == 0 || keylen > BLAKE2B_KEYBYTES)
153                 return -EINVAL;
154
155         memcpy(tctx->key, key, keylen);
156         tctx->keylen = keylen;
157
158         return 0;
159 }
160
161 static int blake2b_init(struct shash_desc *desc)
162 {
163         struct blake2b_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
164         struct blake2b_state *state = shash_desc_ctx(desc);
165         const int digestsize = crypto_shash_digestsize(desc->tfm);
166
167         memset(state, 0, sizeof(*state));
168         memcpy(state->h, blake2b_IV, sizeof(state->h));
169
170         /* Parameter block is all zeros except index 0, no xor for 1..7 */
171         state->h[0] ^= 0x01010000 | tctx->keylen << 8 | digestsize;
172
173         if (tctx->keylen) {
174                 /*
175                  * Prefill the buffer with the key, next call to _update or
176                  * _final will process it
177                  */
178                 memcpy(state->buf, tctx->key, tctx->keylen);
179                 state->buflen = BLAKE2B_BLOCKBYTES;
180         }
181         return 0;
182 }
183
184 static int blake2b_update(struct shash_desc *desc, const u8 *in,
185                           unsigned int inlen)
186 {
187         struct blake2b_state *state = shash_desc_ctx(desc);
188         const size_t left = state->buflen;
189         const size_t fill = BLAKE2B_BLOCKBYTES - left;
190
191         if (!inlen)
192                 return 0;
193
194         if (inlen > fill) {
195                 state->buflen = 0;
196                 /* Fill buffer */
197                 memcpy(state->buf + left, in, fill);
198                 blake2b_increment_counter(state, BLAKE2B_BLOCKBYTES);
199                 /* Compress */
200                 blake2b_compress(state, state->buf);
201                 in += fill;
202                 inlen -= fill;
203                 while (inlen > BLAKE2B_BLOCKBYTES) {
204                         blake2b_increment_counter(state, BLAKE2B_BLOCKBYTES);
205                         blake2b_compress(state, in);
206                         in += BLAKE2B_BLOCKBYTES;
207                         inlen -= BLAKE2B_BLOCKBYTES;
208                 }
209         }
210         memcpy(state->buf + state->buflen, in, inlen);
211         state->buflen += inlen;
212
213         return 0;
214 }
215
216 static int blake2b_final(struct shash_desc *desc, u8 *out)
217 {
218         struct blake2b_state *state = shash_desc_ctx(desc);
219         const int digestsize = crypto_shash_digestsize(desc->tfm);
220         size_t i;
221
222         blake2b_increment_counter(state, state->buflen);
223         /* Set last block */
224         state->f[0] = (u64)-1;
225         /* Padding */
226         memset(state->buf + state->buflen, 0, BLAKE2B_BLOCKBYTES - state->buflen);
227         blake2b_compress(state, state->buf);
228
229         /* Avoid temporary buffer and switch the internal output to LE order */
230         for (i = 0; i < ARRAY_SIZE(state->h); i++)
231                 __cpu_to_le64s(&state->h[i]);
232
233         memcpy(out, state->h, digestsize);
234         return 0;
235 }
236
237 static struct shash_alg blake2b_algs[] = {
238         {
239                 .base.cra_name          = "blake2b-160",
240                 .base.cra_driver_name   = "blake2b-160-generic",
241                 .base.cra_priority      = 100,
242                 .base.cra_flags         = CRYPTO_ALG_OPTIONAL_KEY,
243                 .base.cra_blocksize     = BLAKE2B_BLOCKBYTES,
244                 .base.cra_ctxsize       = sizeof(struct blake2b_tfm_ctx),
245                 .base.cra_module        = THIS_MODULE,
246                 .digestsize             = BLAKE2B_160_DIGEST_SIZE,
247                 .setkey                 = blake2b_setkey,
248                 .init                   = blake2b_init,
249                 .update                 = blake2b_update,
250                 .final                  = blake2b_final,
251                 .descsize               = sizeof(struct blake2b_state),
252         }, {
253                 .base.cra_name          = "blake2b-256",
254                 .base.cra_driver_name   = "blake2b-256-generic",
255                 .base.cra_priority      = 100,
256                 .base.cra_flags         = CRYPTO_ALG_OPTIONAL_KEY,
257                 .base.cra_blocksize     = BLAKE2B_BLOCKBYTES,
258                 .base.cra_ctxsize       = sizeof(struct blake2b_tfm_ctx),
259                 .base.cra_module        = THIS_MODULE,
260                 .digestsize             = BLAKE2B_256_DIGEST_SIZE,
261                 .setkey                 = blake2b_setkey,
262                 .init                   = blake2b_init,
263                 .update                 = blake2b_update,
264                 .final                  = blake2b_final,
265                 .descsize               = sizeof(struct blake2b_state),
266         }, {
267                 .base.cra_name          = "blake2b-384",
268                 .base.cra_driver_name   = "blake2b-384-generic",
269                 .base.cra_priority      = 100,
270                 .base.cra_flags         = CRYPTO_ALG_OPTIONAL_KEY,
271                 .base.cra_blocksize     = BLAKE2B_BLOCKBYTES,
272                 .base.cra_ctxsize       = sizeof(struct blake2b_tfm_ctx),
273                 .base.cra_module        = THIS_MODULE,
274                 .digestsize             = BLAKE2B_384_DIGEST_SIZE,
275                 .setkey                 = blake2b_setkey,
276                 .init                   = blake2b_init,
277                 .update                 = blake2b_update,
278                 .final                  = blake2b_final,
279                 .descsize               = sizeof(struct blake2b_state),
280         }, {
281                 .base.cra_name          = "blake2b-512",
282                 .base.cra_driver_name   = "blake2b-512-generic",
283                 .base.cra_priority      = 100,
284                 .base.cra_flags         = CRYPTO_ALG_OPTIONAL_KEY,
285                 .base.cra_blocksize     = BLAKE2B_BLOCKBYTES,
286                 .base.cra_ctxsize       = sizeof(struct blake2b_tfm_ctx),
287                 .base.cra_module        = THIS_MODULE,
288                 .digestsize             = BLAKE2B_512_DIGEST_SIZE,
289                 .setkey                 = blake2b_setkey,
290                 .init                   = blake2b_init,
291                 .update                 = blake2b_update,
292                 .final                  = blake2b_final,
293                 .descsize               = sizeof(struct blake2b_state),
294         }
295 };
296
297 static int __init blake2b_mod_init(void)
298 {
299         return crypto_register_shashes(blake2b_algs, ARRAY_SIZE(blake2b_algs));
300 }
301
302 static void __exit blake2b_mod_fini(void)
303 {
304         crypto_unregister_shashes(blake2b_algs, ARRAY_SIZE(blake2b_algs));
305 }
306
307 subsys_initcall(blake2b_mod_init);
308 module_exit(blake2b_mod_fini);
309
310 MODULE_AUTHOR("David Sterba <kdave@kernel.org>");
311 MODULE_DESCRIPTION("BLAKE2b generic implementation");
312 MODULE_LICENSE("GPL");
313 MODULE_ALIAS_CRYPTO("blake2b-160");
314 MODULE_ALIAS_CRYPTO("blake2b-160-generic");
315 MODULE_ALIAS_CRYPTO("blake2b-256");
316 MODULE_ALIAS_CRYPTO("blake2b-256-generic");
317 MODULE_ALIAS_CRYPTO("blake2b-384");
318 MODULE_ALIAS_CRYPTO("blake2b-384-generic");
319 MODULE_ALIAS_CRYPTO("blake2b-512");
320 MODULE_ALIAS_CRYPTO("blake2b-512-generic");