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 : https://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"); 321