1 /* 2 * Cryptographic API. 3 * 4 * SHA-3, as specified in 5 * http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.202.pdf 6 * 7 * SHA-3 code by Jeff Garzik <jeff@garzik.org> 8 * Ard Biesheuvel <ard.biesheuvel@linaro.org> 9 * 10 * This program is free software; you can redistribute it and/or modify it 11 * under the terms of the GNU General Public License as published by the Free 12 * Software Foundation; either version 2 of the License, or (at your option)• 13 * any later version. 14 * 15 */ 16 #include <crypto/internal/hash.h> 17 #include <linux/init.h> 18 #include <linux/module.h> 19 #include <linux/types.h> 20 #include <crypto/sha3.h> 21 #include <asm/unaligned.h> 22 23 #define KECCAK_ROUNDS 24 24 25 static const u64 keccakf_rndc[24] = { 26 0x0000000000000001ULL, 0x0000000000008082ULL, 0x800000000000808aULL, 27 0x8000000080008000ULL, 0x000000000000808bULL, 0x0000000080000001ULL, 28 0x8000000080008081ULL, 0x8000000000008009ULL, 0x000000000000008aULL, 29 0x0000000000000088ULL, 0x0000000080008009ULL, 0x000000008000000aULL, 30 0x000000008000808bULL, 0x800000000000008bULL, 0x8000000000008089ULL, 31 0x8000000000008003ULL, 0x8000000000008002ULL, 0x8000000000000080ULL, 32 0x000000000000800aULL, 0x800000008000000aULL, 0x8000000080008081ULL, 33 0x8000000000008080ULL, 0x0000000080000001ULL, 0x8000000080008008ULL 34 }; 35 36 /* update the state with given number of rounds */ 37 38 static void __attribute__((__optimize__("O3"))) keccakf(u64 st[25]) 39 { 40 u64 t[5], tt, bc[5]; 41 int round; 42 43 for (round = 0; round < KECCAK_ROUNDS; round++) { 44 45 /* Theta */ 46 bc[0] = st[0] ^ st[5] ^ st[10] ^ st[15] ^ st[20]; 47 bc[1] = st[1] ^ st[6] ^ st[11] ^ st[16] ^ st[21]; 48 bc[2] = st[2] ^ st[7] ^ st[12] ^ st[17] ^ st[22]; 49 bc[3] = st[3] ^ st[8] ^ st[13] ^ st[18] ^ st[23]; 50 bc[4] = st[4] ^ st[9] ^ st[14] ^ st[19] ^ st[24]; 51 52 t[0] = bc[4] ^ rol64(bc[1], 1); 53 t[1] = bc[0] ^ rol64(bc[2], 1); 54 t[2] = bc[1] ^ rol64(bc[3], 1); 55 t[3] = bc[2] ^ rol64(bc[4], 1); 56 t[4] = bc[3] ^ rol64(bc[0], 1); 57 58 st[0] ^= t[0]; 59 60 /* Rho Pi */ 61 tt = st[1]; 62 st[ 1] = rol64(st[ 6] ^ t[1], 44); 63 st[ 6] = rol64(st[ 9] ^ t[4], 20); 64 st[ 9] = rol64(st[22] ^ t[2], 61); 65 st[22] = rol64(st[14] ^ t[4], 39); 66 st[14] = rol64(st[20] ^ t[0], 18); 67 st[20] = rol64(st[ 2] ^ t[2], 62); 68 st[ 2] = rol64(st[12] ^ t[2], 43); 69 st[12] = rol64(st[13] ^ t[3], 25); 70 st[13] = rol64(st[19] ^ t[4], 8); 71 st[19] = rol64(st[23] ^ t[3], 56); 72 st[23] = rol64(st[15] ^ t[0], 41); 73 st[15] = rol64(st[ 4] ^ t[4], 27); 74 st[ 4] = rol64(st[24] ^ t[4], 14); 75 st[24] = rol64(st[21] ^ t[1], 2); 76 st[21] = rol64(st[ 8] ^ t[3], 55); 77 st[ 8] = rol64(st[16] ^ t[1], 45); 78 st[16] = rol64(st[ 5] ^ t[0], 36); 79 st[ 5] = rol64(st[ 3] ^ t[3], 28); 80 st[ 3] = rol64(st[18] ^ t[3], 21); 81 st[18] = rol64(st[17] ^ t[2], 15); 82 st[17] = rol64(st[11] ^ t[1], 10); 83 st[11] = rol64(st[ 7] ^ t[2], 6); 84 st[ 7] = rol64(st[10] ^ t[0], 3); 85 st[10] = rol64( tt ^ t[1], 1); 86 87 /* Chi */ 88 bc[ 0] = ~st[ 1] & st[ 2]; 89 bc[ 1] = ~st[ 2] & st[ 3]; 90 bc[ 2] = ~st[ 3] & st[ 4]; 91 bc[ 3] = ~st[ 4] & st[ 0]; 92 bc[ 4] = ~st[ 0] & st[ 1]; 93 st[ 0] ^= bc[ 0]; 94 st[ 1] ^= bc[ 1]; 95 st[ 2] ^= bc[ 2]; 96 st[ 3] ^= bc[ 3]; 97 st[ 4] ^= bc[ 4]; 98 99 bc[ 0] = ~st[ 6] & st[ 7]; 100 bc[ 1] = ~st[ 7] & st[ 8]; 101 bc[ 2] = ~st[ 8] & st[ 9]; 102 bc[ 3] = ~st[ 9] & st[ 5]; 103 bc[ 4] = ~st[ 5] & st[ 6]; 104 st[ 5] ^= bc[ 0]; 105 st[ 6] ^= bc[ 1]; 106 st[ 7] ^= bc[ 2]; 107 st[ 8] ^= bc[ 3]; 108 st[ 9] ^= bc[ 4]; 109 110 bc[ 0] = ~st[11] & st[12]; 111 bc[ 1] = ~st[12] & st[13]; 112 bc[ 2] = ~st[13] & st[14]; 113 bc[ 3] = ~st[14] & st[10]; 114 bc[ 4] = ~st[10] & st[11]; 115 st[10] ^= bc[ 0]; 116 st[11] ^= bc[ 1]; 117 st[12] ^= bc[ 2]; 118 st[13] ^= bc[ 3]; 119 st[14] ^= bc[ 4]; 120 121 bc[ 0] = ~st[16] & st[17]; 122 bc[ 1] = ~st[17] & st[18]; 123 bc[ 2] = ~st[18] & st[19]; 124 bc[ 3] = ~st[19] & st[15]; 125 bc[ 4] = ~st[15] & st[16]; 126 st[15] ^= bc[ 0]; 127 st[16] ^= bc[ 1]; 128 st[17] ^= bc[ 2]; 129 st[18] ^= bc[ 3]; 130 st[19] ^= bc[ 4]; 131 132 bc[ 0] = ~st[21] & st[22]; 133 bc[ 1] = ~st[22] & st[23]; 134 bc[ 2] = ~st[23] & st[24]; 135 bc[ 3] = ~st[24] & st[20]; 136 bc[ 4] = ~st[20] & st[21]; 137 st[20] ^= bc[ 0]; 138 st[21] ^= bc[ 1]; 139 st[22] ^= bc[ 2]; 140 st[23] ^= bc[ 3]; 141 st[24] ^= bc[ 4]; 142 143 /* Iota */ 144 st[0] ^= keccakf_rndc[round]; 145 } 146 } 147 148 int crypto_sha3_init(struct shash_desc *desc) 149 { 150 struct sha3_state *sctx = shash_desc_ctx(desc); 151 unsigned int digest_size = crypto_shash_digestsize(desc->tfm); 152 153 sctx->rsiz = 200 - 2 * digest_size; 154 sctx->rsizw = sctx->rsiz / 8; 155 sctx->partial = 0; 156 157 memset(sctx->st, 0, sizeof(sctx->st)); 158 return 0; 159 } 160 EXPORT_SYMBOL(crypto_sha3_init); 161 162 int crypto_sha3_update(struct shash_desc *desc, const u8 *data, 163 unsigned int len) 164 { 165 struct sha3_state *sctx = shash_desc_ctx(desc); 166 unsigned int done; 167 const u8 *src; 168 169 done = 0; 170 src = data; 171 172 if ((sctx->partial + len) > (sctx->rsiz - 1)) { 173 if (sctx->partial) { 174 done = -sctx->partial; 175 memcpy(sctx->buf + sctx->partial, data, 176 done + sctx->rsiz); 177 src = sctx->buf; 178 } 179 180 do { 181 unsigned int i; 182 183 for (i = 0; i < sctx->rsizw; i++) 184 sctx->st[i] ^= get_unaligned_le64(src + 8 * i); 185 keccakf(sctx->st); 186 187 done += sctx->rsiz; 188 src = data + done; 189 } while (done + (sctx->rsiz - 1) < len); 190 191 sctx->partial = 0; 192 } 193 memcpy(sctx->buf + sctx->partial, src, len - done); 194 sctx->partial += (len - done); 195 196 return 0; 197 } 198 EXPORT_SYMBOL(crypto_sha3_update); 199 200 int crypto_sha3_final(struct shash_desc *desc, u8 *out) 201 { 202 struct sha3_state *sctx = shash_desc_ctx(desc); 203 unsigned int i, inlen = sctx->partial; 204 unsigned int digest_size = crypto_shash_digestsize(desc->tfm); 205 __le64 *digest = (__le64 *)out; 206 207 sctx->buf[inlen++] = 0x06; 208 memset(sctx->buf + inlen, 0, sctx->rsiz - inlen); 209 sctx->buf[sctx->rsiz - 1] |= 0x80; 210 211 for (i = 0; i < sctx->rsizw; i++) 212 sctx->st[i] ^= get_unaligned_le64(sctx->buf + 8 * i); 213 214 keccakf(sctx->st); 215 216 for (i = 0; i < digest_size / 8; i++) 217 put_unaligned_le64(sctx->st[i], digest++); 218 219 if (digest_size & 4) 220 put_unaligned_le32(sctx->st[i], (__le32 *)digest); 221 222 memset(sctx, 0, sizeof(*sctx)); 223 return 0; 224 } 225 EXPORT_SYMBOL(crypto_sha3_final); 226 227 static struct shash_alg algs[] = { { 228 .digestsize = SHA3_224_DIGEST_SIZE, 229 .init = crypto_sha3_init, 230 .update = crypto_sha3_update, 231 .final = crypto_sha3_final, 232 .descsize = sizeof(struct sha3_state), 233 .base.cra_name = "sha3-224", 234 .base.cra_driver_name = "sha3-224-generic", 235 .base.cra_flags = CRYPTO_ALG_TYPE_SHASH, 236 .base.cra_blocksize = SHA3_224_BLOCK_SIZE, 237 .base.cra_module = THIS_MODULE, 238 }, { 239 .digestsize = SHA3_256_DIGEST_SIZE, 240 .init = crypto_sha3_init, 241 .update = crypto_sha3_update, 242 .final = crypto_sha3_final, 243 .descsize = sizeof(struct sha3_state), 244 .base.cra_name = "sha3-256", 245 .base.cra_driver_name = "sha3-256-generic", 246 .base.cra_flags = CRYPTO_ALG_TYPE_SHASH, 247 .base.cra_blocksize = SHA3_256_BLOCK_SIZE, 248 .base.cra_module = THIS_MODULE, 249 }, { 250 .digestsize = SHA3_384_DIGEST_SIZE, 251 .init = crypto_sha3_init, 252 .update = crypto_sha3_update, 253 .final = crypto_sha3_final, 254 .descsize = sizeof(struct sha3_state), 255 .base.cra_name = "sha3-384", 256 .base.cra_driver_name = "sha3-384-generic", 257 .base.cra_flags = CRYPTO_ALG_TYPE_SHASH, 258 .base.cra_blocksize = SHA3_384_BLOCK_SIZE, 259 .base.cra_module = THIS_MODULE, 260 }, { 261 .digestsize = SHA3_512_DIGEST_SIZE, 262 .init = crypto_sha3_init, 263 .update = crypto_sha3_update, 264 .final = crypto_sha3_final, 265 .descsize = sizeof(struct sha3_state), 266 .base.cra_name = "sha3-512", 267 .base.cra_driver_name = "sha3-512-generic", 268 .base.cra_flags = CRYPTO_ALG_TYPE_SHASH, 269 .base.cra_blocksize = SHA3_512_BLOCK_SIZE, 270 .base.cra_module = THIS_MODULE, 271 } }; 272 273 static int __init sha3_generic_mod_init(void) 274 { 275 return crypto_register_shashes(algs, ARRAY_SIZE(algs)); 276 } 277 278 static void __exit sha3_generic_mod_fini(void) 279 { 280 crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); 281 } 282 283 module_init(sha3_generic_mod_init); 284 module_exit(sha3_generic_mod_fini); 285 286 MODULE_LICENSE("GPL"); 287 MODULE_DESCRIPTION("SHA-3 Secure Hash Algorithm"); 288 289 MODULE_ALIAS_CRYPTO("sha3-224"); 290 MODULE_ALIAS_CRYPTO("sha3-224-generic"); 291 MODULE_ALIAS_CRYPTO("sha3-256"); 292 MODULE_ALIAS_CRYPTO("sha3-256-generic"); 293 MODULE_ALIAS_CRYPTO("sha3-384"); 294 MODULE_ALIAS_CRYPTO("sha3-384-generic"); 295 MODULE_ALIAS_CRYPTO("sha3-512"); 296 MODULE_ALIAS_CRYPTO("sha3-512-generic"); 297