1 /* 2 * Cryptographic API. 3 * 4 * SHA-256, as specified in 5 * http://csrc.nist.gov/groups/STM/cavp/documents/shs/sha256-384-512.pdf 6 * 7 * SHA-256 code by Jean-Luc Cooke <jlcooke@certainkey.com>. 8 * 9 * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com> 10 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> 11 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> 12 * SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com> 13 * 14 * This program is free software; you can redistribute it and/or modify it 15 * under the terms of the GNU General Public License as published by the Free 16 * Software Foundation; either version 2 of the License, or (at your option) 17 * any later version. 18 * 19 */ 20 #include <crypto/internal/hash.h> 21 #include <linux/init.h> 22 #include <linux/module.h> 23 #include <linux/mm.h> 24 #include <linux/types.h> 25 #include <crypto/sha.h> 26 #include <asm/byteorder.h> 27 28 struct sha256_ctx { 29 u32 count[2]; 30 u32 state[8]; 31 u8 buf[128]; 32 }; 33 34 static inline u32 Ch(u32 x, u32 y, u32 z) 35 { 36 return z ^ (x & (y ^ z)); 37 } 38 39 static inline u32 Maj(u32 x, u32 y, u32 z) 40 { 41 return (x & y) | (z & (x | y)); 42 } 43 44 #define e0(x) (ror32(x, 2) ^ ror32(x,13) ^ ror32(x,22)) 45 #define e1(x) (ror32(x, 6) ^ ror32(x,11) ^ ror32(x,25)) 46 #define s0(x) (ror32(x, 7) ^ ror32(x,18) ^ (x >> 3)) 47 #define s1(x) (ror32(x,17) ^ ror32(x,19) ^ (x >> 10)) 48 49 static inline void LOAD_OP(int I, u32 *W, const u8 *input) 50 { 51 W[I] = __be32_to_cpu( ((__be32*)(input))[I] ); 52 } 53 54 static inline void BLEND_OP(int I, u32 *W) 55 { 56 W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16]; 57 } 58 59 static void sha256_transform(u32 *state, const u8 *input) 60 { 61 u32 a, b, c, d, e, f, g, h, t1, t2; 62 u32 W[64]; 63 int i; 64 65 /* load the input */ 66 for (i = 0; i < 16; i++) 67 LOAD_OP(i, W, input); 68 69 /* now blend */ 70 for (i = 16; i < 64; i++) 71 BLEND_OP(i, W); 72 73 /* load the state into our registers */ 74 a=state[0]; b=state[1]; c=state[2]; d=state[3]; 75 e=state[4]; f=state[5]; g=state[6]; h=state[7]; 76 77 /* now iterate */ 78 t1 = h + e1(e) + Ch(e,f,g) + 0x428a2f98 + W[ 0]; 79 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 80 t1 = g + e1(d) + Ch(d,e,f) + 0x71374491 + W[ 1]; 81 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 82 t1 = f + e1(c) + Ch(c,d,e) + 0xb5c0fbcf + W[ 2]; 83 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 84 t1 = e + e1(b) + Ch(b,c,d) + 0xe9b5dba5 + W[ 3]; 85 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 86 t1 = d + e1(a) + Ch(a,b,c) + 0x3956c25b + W[ 4]; 87 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 88 t1 = c + e1(h) + Ch(h,a,b) + 0x59f111f1 + W[ 5]; 89 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 90 t1 = b + e1(g) + Ch(g,h,a) + 0x923f82a4 + W[ 6]; 91 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 92 t1 = a + e1(f) + Ch(f,g,h) + 0xab1c5ed5 + W[ 7]; 93 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 94 95 t1 = h + e1(e) + Ch(e,f,g) + 0xd807aa98 + W[ 8]; 96 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 97 t1 = g + e1(d) + Ch(d,e,f) + 0x12835b01 + W[ 9]; 98 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 99 t1 = f + e1(c) + Ch(c,d,e) + 0x243185be + W[10]; 100 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 101 t1 = e + e1(b) + Ch(b,c,d) + 0x550c7dc3 + W[11]; 102 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 103 t1 = d + e1(a) + Ch(a,b,c) + 0x72be5d74 + W[12]; 104 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 105 t1 = c + e1(h) + Ch(h,a,b) + 0x80deb1fe + W[13]; 106 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 107 t1 = b + e1(g) + Ch(g,h,a) + 0x9bdc06a7 + W[14]; 108 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 109 t1 = a + e1(f) + Ch(f,g,h) + 0xc19bf174 + W[15]; 110 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 111 112 t1 = h + e1(e) + Ch(e,f,g) + 0xe49b69c1 + W[16]; 113 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 114 t1 = g + e1(d) + Ch(d,e,f) + 0xefbe4786 + W[17]; 115 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 116 t1 = f + e1(c) + Ch(c,d,e) + 0x0fc19dc6 + W[18]; 117 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 118 t1 = e + e1(b) + Ch(b,c,d) + 0x240ca1cc + W[19]; 119 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 120 t1 = d + e1(a) + Ch(a,b,c) + 0x2de92c6f + W[20]; 121 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 122 t1 = c + e1(h) + Ch(h,a,b) + 0x4a7484aa + W[21]; 123 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 124 t1 = b + e1(g) + Ch(g,h,a) + 0x5cb0a9dc + W[22]; 125 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 126 t1 = a + e1(f) + Ch(f,g,h) + 0x76f988da + W[23]; 127 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 128 129 t1 = h + e1(e) + Ch(e,f,g) + 0x983e5152 + W[24]; 130 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 131 t1 = g + e1(d) + Ch(d,e,f) + 0xa831c66d + W[25]; 132 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 133 t1 = f + e1(c) + Ch(c,d,e) + 0xb00327c8 + W[26]; 134 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 135 t1 = e + e1(b) + Ch(b,c,d) + 0xbf597fc7 + W[27]; 136 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 137 t1 = d + e1(a) + Ch(a,b,c) + 0xc6e00bf3 + W[28]; 138 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 139 t1 = c + e1(h) + Ch(h,a,b) + 0xd5a79147 + W[29]; 140 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 141 t1 = b + e1(g) + Ch(g,h,a) + 0x06ca6351 + W[30]; 142 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 143 t1 = a + e1(f) + Ch(f,g,h) + 0x14292967 + W[31]; 144 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 145 146 t1 = h + e1(e) + Ch(e,f,g) + 0x27b70a85 + W[32]; 147 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 148 t1 = g + e1(d) + Ch(d,e,f) + 0x2e1b2138 + W[33]; 149 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 150 t1 = f + e1(c) + Ch(c,d,e) + 0x4d2c6dfc + W[34]; 151 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 152 t1 = e + e1(b) + Ch(b,c,d) + 0x53380d13 + W[35]; 153 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 154 t1 = d + e1(a) + Ch(a,b,c) + 0x650a7354 + W[36]; 155 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 156 t1 = c + e1(h) + Ch(h,a,b) + 0x766a0abb + W[37]; 157 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 158 t1 = b + e1(g) + Ch(g,h,a) + 0x81c2c92e + W[38]; 159 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 160 t1 = a + e1(f) + Ch(f,g,h) + 0x92722c85 + W[39]; 161 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 162 163 t1 = h + e1(e) + Ch(e,f,g) + 0xa2bfe8a1 + W[40]; 164 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 165 t1 = g + e1(d) + Ch(d,e,f) + 0xa81a664b + W[41]; 166 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 167 t1 = f + e1(c) + Ch(c,d,e) + 0xc24b8b70 + W[42]; 168 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 169 t1 = e + e1(b) + Ch(b,c,d) + 0xc76c51a3 + W[43]; 170 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 171 t1 = d + e1(a) + Ch(a,b,c) + 0xd192e819 + W[44]; 172 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 173 t1 = c + e1(h) + Ch(h,a,b) + 0xd6990624 + W[45]; 174 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 175 t1 = b + e1(g) + Ch(g,h,a) + 0xf40e3585 + W[46]; 176 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 177 t1 = a + e1(f) + Ch(f,g,h) + 0x106aa070 + W[47]; 178 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 179 180 t1 = h + e1(e) + Ch(e,f,g) + 0x19a4c116 + W[48]; 181 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 182 t1 = g + e1(d) + Ch(d,e,f) + 0x1e376c08 + W[49]; 183 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 184 t1 = f + e1(c) + Ch(c,d,e) + 0x2748774c + W[50]; 185 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 186 t1 = e + e1(b) + Ch(b,c,d) + 0x34b0bcb5 + W[51]; 187 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 188 t1 = d + e1(a) + Ch(a,b,c) + 0x391c0cb3 + W[52]; 189 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 190 t1 = c + e1(h) + Ch(h,a,b) + 0x4ed8aa4a + W[53]; 191 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 192 t1 = b + e1(g) + Ch(g,h,a) + 0x5b9cca4f + W[54]; 193 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 194 t1 = a + e1(f) + Ch(f,g,h) + 0x682e6ff3 + W[55]; 195 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 196 197 t1 = h + e1(e) + Ch(e,f,g) + 0x748f82ee + W[56]; 198 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 199 t1 = g + e1(d) + Ch(d,e,f) + 0x78a5636f + W[57]; 200 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 201 t1 = f + e1(c) + Ch(c,d,e) + 0x84c87814 + W[58]; 202 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 203 t1 = e + e1(b) + Ch(b,c,d) + 0x8cc70208 + W[59]; 204 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 205 t1 = d + e1(a) + Ch(a,b,c) + 0x90befffa + W[60]; 206 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 207 t1 = c + e1(h) + Ch(h,a,b) + 0xa4506ceb + W[61]; 208 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 209 t1 = b + e1(g) + Ch(g,h,a) + 0xbef9a3f7 + W[62]; 210 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 211 t1 = a + e1(f) + Ch(f,g,h) + 0xc67178f2 + W[63]; 212 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 213 214 state[0] += a; state[1] += b; state[2] += c; state[3] += d; 215 state[4] += e; state[5] += f; state[6] += g; state[7] += h; 216 217 /* clear any sensitive info... */ 218 a = b = c = d = e = f = g = h = t1 = t2 = 0; 219 memset(W, 0, 64 * sizeof(u32)); 220 } 221 222 223 static int sha224_init(struct shash_desc *desc) 224 { 225 struct sha256_ctx *sctx = shash_desc_ctx(desc); 226 sctx->state[0] = SHA224_H0; 227 sctx->state[1] = SHA224_H1; 228 sctx->state[2] = SHA224_H2; 229 sctx->state[3] = SHA224_H3; 230 sctx->state[4] = SHA224_H4; 231 sctx->state[5] = SHA224_H5; 232 sctx->state[6] = SHA224_H6; 233 sctx->state[7] = SHA224_H7; 234 sctx->count[0] = 0; 235 sctx->count[1] = 0; 236 237 return 0; 238 } 239 240 static int sha256_init(struct shash_desc *desc) 241 { 242 struct sha256_ctx *sctx = shash_desc_ctx(desc); 243 sctx->state[0] = SHA256_H0; 244 sctx->state[1] = SHA256_H1; 245 sctx->state[2] = SHA256_H2; 246 sctx->state[3] = SHA256_H3; 247 sctx->state[4] = SHA256_H4; 248 sctx->state[5] = SHA256_H5; 249 sctx->state[6] = SHA256_H6; 250 sctx->state[7] = SHA256_H7; 251 sctx->count[0] = sctx->count[1] = 0; 252 253 return 0; 254 } 255 256 static int sha256_update(struct shash_desc *desc, const u8 *data, 257 unsigned int len) 258 { 259 struct sha256_ctx *sctx = shash_desc_ctx(desc); 260 unsigned int i, index, part_len; 261 262 /* Compute number of bytes mod 128 */ 263 index = (unsigned int)((sctx->count[0] >> 3) & 0x3f); 264 265 /* Update number of bits */ 266 if ((sctx->count[0] += (len << 3)) < (len << 3)) { 267 sctx->count[1]++; 268 sctx->count[1] += (len >> 29); 269 } 270 271 part_len = 64 - index; 272 273 /* Transform as many times as possible. */ 274 if (len >= part_len) { 275 memcpy(&sctx->buf[index], data, part_len); 276 sha256_transform(sctx->state, sctx->buf); 277 278 for (i = part_len; i + 63 < len; i += 64) 279 sha256_transform(sctx->state, &data[i]); 280 index = 0; 281 } else { 282 i = 0; 283 } 284 285 /* Buffer remaining input */ 286 memcpy(&sctx->buf[index], &data[i], len-i); 287 288 return 0; 289 } 290 291 static int sha256_final(struct shash_desc *desc, u8 *out) 292 { 293 struct sha256_ctx *sctx = shash_desc_ctx(desc); 294 __be32 *dst = (__be32 *)out; 295 __be32 bits[2]; 296 unsigned int index, pad_len; 297 int i; 298 static const u8 padding[64] = { 0x80, }; 299 300 /* Save number of bits */ 301 bits[1] = cpu_to_be32(sctx->count[0]); 302 bits[0] = cpu_to_be32(sctx->count[1]); 303 304 /* Pad out to 56 mod 64. */ 305 index = (sctx->count[0] >> 3) & 0x3f; 306 pad_len = (index < 56) ? (56 - index) : ((64+56) - index); 307 sha256_update(desc, padding, pad_len); 308 309 /* Append length (before padding) */ 310 sha256_update(desc, (const u8 *)bits, sizeof(bits)); 311 312 /* Store state in digest */ 313 for (i = 0; i < 8; i++) 314 dst[i] = cpu_to_be32(sctx->state[i]); 315 316 /* Zeroize sensitive information. */ 317 memset(sctx, 0, sizeof(*sctx)); 318 319 return 0; 320 } 321 322 static int sha224_final(struct shash_desc *desc, u8 *hash) 323 { 324 u8 D[SHA256_DIGEST_SIZE]; 325 326 sha256_final(desc, D); 327 328 memcpy(hash, D, SHA224_DIGEST_SIZE); 329 memset(D, 0, SHA256_DIGEST_SIZE); 330 331 return 0; 332 } 333 334 static struct shash_alg sha256 = { 335 .digestsize = SHA256_DIGEST_SIZE, 336 .init = sha256_init, 337 .update = sha256_update, 338 .final = sha256_final, 339 .descsize = sizeof(struct sha256_ctx), 340 .base = { 341 .cra_name = "sha256", 342 .cra_driver_name= "sha256-generic", 343 .cra_flags = CRYPTO_ALG_TYPE_SHASH, 344 .cra_blocksize = SHA256_BLOCK_SIZE, 345 .cra_module = THIS_MODULE, 346 } 347 }; 348 349 static struct shash_alg sha224 = { 350 .digestsize = SHA224_DIGEST_SIZE, 351 .init = sha224_init, 352 .update = sha256_update, 353 .final = sha224_final, 354 .descsize = sizeof(struct sha256_ctx), 355 .base = { 356 .cra_name = "sha224", 357 .cra_driver_name= "sha224-generic", 358 .cra_flags = CRYPTO_ALG_TYPE_SHASH, 359 .cra_blocksize = SHA224_BLOCK_SIZE, 360 .cra_module = THIS_MODULE, 361 } 362 }; 363 364 static int __init sha256_generic_mod_init(void) 365 { 366 int ret = 0; 367 368 ret = crypto_register_shash(&sha224); 369 370 if (ret < 0) 371 return ret; 372 373 ret = crypto_register_shash(&sha256); 374 375 if (ret < 0) 376 crypto_unregister_shash(&sha224); 377 378 return ret; 379 } 380 381 static void __exit sha256_generic_mod_fini(void) 382 { 383 crypto_unregister_shash(&sha224); 384 crypto_unregister_shash(&sha256); 385 } 386 387 module_init(sha256_generic_mod_init); 388 module_exit(sha256_generic_mod_fini); 389 390 MODULE_LICENSE("GPL"); 391 MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm"); 392 393 MODULE_ALIAS("sha224"); 394 MODULE_ALIAS("sha256"); 395