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 static inline u32 Ch(u32 x, u32 y, u32 z) 29 { 30 return z ^ (x & (y ^ z)); 31 } 32 33 static inline u32 Maj(u32 x, u32 y, u32 z) 34 { 35 return (x & y) | (z & (x | y)); 36 } 37 38 #define e0(x) (ror32(x, 2) ^ ror32(x,13) ^ ror32(x,22)) 39 #define e1(x) (ror32(x, 6) ^ ror32(x,11) ^ ror32(x,25)) 40 #define s0(x) (ror32(x, 7) ^ ror32(x,18) ^ (x >> 3)) 41 #define s1(x) (ror32(x,17) ^ ror32(x,19) ^ (x >> 10)) 42 43 static inline void LOAD_OP(int I, u32 *W, const u8 *input) 44 { 45 W[I] = __be32_to_cpu( ((__be32*)(input))[I] ); 46 } 47 48 static inline void BLEND_OP(int I, u32 *W) 49 { 50 W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16]; 51 } 52 53 static void sha256_transform(u32 *state, const u8 *input) 54 { 55 u32 a, b, c, d, e, f, g, h, t1, t2; 56 u32 W[64]; 57 int i; 58 59 /* load the input */ 60 for (i = 0; i < 16; i++) 61 LOAD_OP(i, W, input); 62 63 /* now blend */ 64 for (i = 16; i < 64; i++) 65 BLEND_OP(i, W); 66 67 /* load the state into our registers */ 68 a=state[0]; b=state[1]; c=state[2]; d=state[3]; 69 e=state[4]; f=state[5]; g=state[6]; h=state[7]; 70 71 /* now iterate */ 72 t1 = h + e1(e) + Ch(e,f,g) + 0x428a2f98 + W[ 0]; 73 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 74 t1 = g + e1(d) + Ch(d,e,f) + 0x71374491 + W[ 1]; 75 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 76 t1 = f + e1(c) + Ch(c,d,e) + 0xb5c0fbcf + W[ 2]; 77 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 78 t1 = e + e1(b) + Ch(b,c,d) + 0xe9b5dba5 + W[ 3]; 79 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 80 t1 = d + e1(a) + Ch(a,b,c) + 0x3956c25b + W[ 4]; 81 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 82 t1 = c + e1(h) + Ch(h,a,b) + 0x59f111f1 + W[ 5]; 83 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 84 t1 = b + e1(g) + Ch(g,h,a) + 0x923f82a4 + W[ 6]; 85 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 86 t1 = a + e1(f) + Ch(f,g,h) + 0xab1c5ed5 + W[ 7]; 87 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 88 89 t1 = h + e1(e) + Ch(e,f,g) + 0xd807aa98 + W[ 8]; 90 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 91 t1 = g + e1(d) + Ch(d,e,f) + 0x12835b01 + W[ 9]; 92 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 93 t1 = f + e1(c) + Ch(c,d,e) + 0x243185be + W[10]; 94 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 95 t1 = e + e1(b) + Ch(b,c,d) + 0x550c7dc3 + W[11]; 96 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 97 t1 = d + e1(a) + Ch(a,b,c) + 0x72be5d74 + W[12]; 98 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 99 t1 = c + e1(h) + Ch(h,a,b) + 0x80deb1fe + W[13]; 100 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 101 t1 = b + e1(g) + Ch(g,h,a) + 0x9bdc06a7 + W[14]; 102 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 103 t1 = a + e1(f) + Ch(f,g,h) + 0xc19bf174 + W[15]; 104 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 105 106 t1 = h + e1(e) + Ch(e,f,g) + 0xe49b69c1 + W[16]; 107 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 108 t1 = g + e1(d) + Ch(d,e,f) + 0xefbe4786 + W[17]; 109 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 110 t1 = f + e1(c) + Ch(c,d,e) + 0x0fc19dc6 + W[18]; 111 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 112 t1 = e + e1(b) + Ch(b,c,d) + 0x240ca1cc + W[19]; 113 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 114 t1 = d + e1(a) + Ch(a,b,c) + 0x2de92c6f + W[20]; 115 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 116 t1 = c + e1(h) + Ch(h,a,b) + 0x4a7484aa + W[21]; 117 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 118 t1 = b + e1(g) + Ch(g,h,a) + 0x5cb0a9dc + W[22]; 119 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 120 t1 = a + e1(f) + Ch(f,g,h) + 0x76f988da + W[23]; 121 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 122 123 t1 = h + e1(e) + Ch(e,f,g) + 0x983e5152 + W[24]; 124 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 125 t1 = g + e1(d) + Ch(d,e,f) + 0xa831c66d + W[25]; 126 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 127 t1 = f + e1(c) + Ch(c,d,e) + 0xb00327c8 + W[26]; 128 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 129 t1 = e + e1(b) + Ch(b,c,d) + 0xbf597fc7 + W[27]; 130 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 131 t1 = d + e1(a) + Ch(a,b,c) + 0xc6e00bf3 + W[28]; 132 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 133 t1 = c + e1(h) + Ch(h,a,b) + 0xd5a79147 + W[29]; 134 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 135 t1 = b + e1(g) + Ch(g,h,a) + 0x06ca6351 + W[30]; 136 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 137 t1 = a + e1(f) + Ch(f,g,h) + 0x14292967 + W[31]; 138 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 139 140 t1 = h + e1(e) + Ch(e,f,g) + 0x27b70a85 + W[32]; 141 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 142 t1 = g + e1(d) + Ch(d,e,f) + 0x2e1b2138 + W[33]; 143 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 144 t1 = f + e1(c) + Ch(c,d,e) + 0x4d2c6dfc + W[34]; 145 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 146 t1 = e + e1(b) + Ch(b,c,d) + 0x53380d13 + W[35]; 147 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 148 t1 = d + e1(a) + Ch(a,b,c) + 0x650a7354 + W[36]; 149 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 150 t1 = c + e1(h) + Ch(h,a,b) + 0x766a0abb + W[37]; 151 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 152 t1 = b + e1(g) + Ch(g,h,a) + 0x81c2c92e + W[38]; 153 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 154 t1 = a + e1(f) + Ch(f,g,h) + 0x92722c85 + W[39]; 155 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 156 157 t1 = h + e1(e) + Ch(e,f,g) + 0xa2bfe8a1 + W[40]; 158 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 159 t1 = g + e1(d) + Ch(d,e,f) + 0xa81a664b + W[41]; 160 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 161 t1 = f + e1(c) + Ch(c,d,e) + 0xc24b8b70 + W[42]; 162 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 163 t1 = e + e1(b) + Ch(b,c,d) + 0xc76c51a3 + W[43]; 164 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 165 t1 = d + e1(a) + Ch(a,b,c) + 0xd192e819 + W[44]; 166 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 167 t1 = c + e1(h) + Ch(h,a,b) + 0xd6990624 + W[45]; 168 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 169 t1 = b + e1(g) + Ch(g,h,a) + 0xf40e3585 + W[46]; 170 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 171 t1 = a + e1(f) + Ch(f,g,h) + 0x106aa070 + W[47]; 172 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 173 174 t1 = h + e1(e) + Ch(e,f,g) + 0x19a4c116 + W[48]; 175 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 176 t1 = g + e1(d) + Ch(d,e,f) + 0x1e376c08 + W[49]; 177 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 178 t1 = f + e1(c) + Ch(c,d,e) + 0x2748774c + W[50]; 179 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 180 t1 = e + e1(b) + Ch(b,c,d) + 0x34b0bcb5 + W[51]; 181 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 182 t1 = d + e1(a) + Ch(a,b,c) + 0x391c0cb3 + W[52]; 183 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 184 t1 = c + e1(h) + Ch(h,a,b) + 0x4ed8aa4a + W[53]; 185 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 186 t1 = b + e1(g) + Ch(g,h,a) + 0x5b9cca4f + W[54]; 187 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 188 t1 = a + e1(f) + Ch(f,g,h) + 0x682e6ff3 + W[55]; 189 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 190 191 t1 = h + e1(e) + Ch(e,f,g) + 0x748f82ee + W[56]; 192 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 193 t1 = g + e1(d) + Ch(d,e,f) + 0x78a5636f + W[57]; 194 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 195 t1 = f + e1(c) + Ch(c,d,e) + 0x84c87814 + W[58]; 196 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 197 t1 = e + e1(b) + Ch(b,c,d) + 0x8cc70208 + W[59]; 198 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 199 t1 = d + e1(a) + Ch(a,b,c) + 0x90befffa + W[60]; 200 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 201 t1 = c + e1(h) + Ch(h,a,b) + 0xa4506ceb + W[61]; 202 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 203 t1 = b + e1(g) + Ch(g,h,a) + 0xbef9a3f7 + W[62]; 204 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 205 t1 = a + e1(f) + Ch(f,g,h) + 0xc67178f2 + W[63]; 206 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 207 208 state[0] += a; state[1] += b; state[2] += c; state[3] += d; 209 state[4] += e; state[5] += f; state[6] += g; state[7] += h; 210 211 /* clear any sensitive info... */ 212 a = b = c = d = e = f = g = h = t1 = t2 = 0; 213 memset(W, 0, 64 * sizeof(u32)); 214 } 215 216 217 static int sha224_init(struct shash_desc *desc) 218 { 219 struct sha256_state *sctx = shash_desc_ctx(desc); 220 sctx->state[0] = SHA224_H0; 221 sctx->state[1] = SHA224_H1; 222 sctx->state[2] = SHA224_H2; 223 sctx->state[3] = SHA224_H3; 224 sctx->state[4] = SHA224_H4; 225 sctx->state[5] = SHA224_H5; 226 sctx->state[6] = SHA224_H6; 227 sctx->state[7] = SHA224_H7; 228 sctx->count = 0; 229 230 return 0; 231 } 232 233 static int sha256_init(struct shash_desc *desc) 234 { 235 struct sha256_state *sctx = shash_desc_ctx(desc); 236 sctx->state[0] = SHA256_H0; 237 sctx->state[1] = SHA256_H1; 238 sctx->state[2] = SHA256_H2; 239 sctx->state[3] = SHA256_H3; 240 sctx->state[4] = SHA256_H4; 241 sctx->state[5] = SHA256_H5; 242 sctx->state[6] = SHA256_H6; 243 sctx->state[7] = SHA256_H7; 244 sctx->count = 0; 245 246 return 0; 247 } 248 249 int crypto_sha256_update(struct shash_desc *desc, const u8 *data, 250 unsigned int len) 251 { 252 struct sha256_state *sctx = shash_desc_ctx(desc); 253 unsigned int partial, done; 254 const u8 *src; 255 256 partial = sctx->count & 0x3f; 257 sctx->count += len; 258 done = 0; 259 src = data; 260 261 if ((partial + len) > 63) { 262 if (partial) { 263 done = -partial; 264 memcpy(sctx->buf + partial, data, done + 64); 265 src = sctx->buf; 266 } 267 268 do { 269 sha256_transform(sctx->state, src); 270 done += 64; 271 src = data + done; 272 } while (done + 63 < len); 273 274 partial = 0; 275 } 276 memcpy(sctx->buf + partial, src, len - done); 277 278 return 0; 279 } 280 EXPORT_SYMBOL(crypto_sha256_update); 281 282 static int sha256_final(struct shash_desc *desc, u8 *out) 283 { 284 struct sha256_state *sctx = shash_desc_ctx(desc); 285 __be32 *dst = (__be32 *)out; 286 __be64 bits; 287 unsigned int index, pad_len; 288 int i; 289 static const u8 padding[64] = { 0x80, }; 290 291 /* Save number of bits */ 292 bits = cpu_to_be64(sctx->count << 3); 293 294 /* Pad out to 56 mod 64. */ 295 index = sctx->count & 0x3f; 296 pad_len = (index < 56) ? (56 - index) : ((64+56) - index); 297 crypto_sha256_update(desc, padding, pad_len); 298 299 /* Append length (before padding) */ 300 crypto_sha256_update(desc, (const u8 *)&bits, sizeof(bits)); 301 302 /* Store state in digest */ 303 for (i = 0; i < 8; i++) 304 dst[i] = cpu_to_be32(sctx->state[i]); 305 306 /* Zeroize sensitive information. */ 307 memset(sctx, 0, sizeof(*sctx)); 308 309 return 0; 310 } 311 312 static int sha224_final(struct shash_desc *desc, u8 *hash) 313 { 314 u8 D[SHA256_DIGEST_SIZE]; 315 316 sha256_final(desc, D); 317 318 memcpy(hash, D, SHA224_DIGEST_SIZE); 319 memset(D, 0, SHA256_DIGEST_SIZE); 320 321 return 0; 322 } 323 324 static int sha256_export(struct shash_desc *desc, void *out) 325 { 326 struct sha256_state *sctx = shash_desc_ctx(desc); 327 328 memcpy(out, sctx, sizeof(*sctx)); 329 return 0; 330 } 331 332 static int sha256_import(struct shash_desc *desc, const void *in) 333 { 334 struct sha256_state *sctx = shash_desc_ctx(desc); 335 336 memcpy(sctx, in, sizeof(*sctx)); 337 return 0; 338 } 339 340 static struct shash_alg sha256_algs[2] = { { 341 .digestsize = SHA256_DIGEST_SIZE, 342 .init = sha256_init, 343 .update = crypto_sha256_update, 344 .final = sha256_final, 345 .export = sha256_export, 346 .import = sha256_import, 347 .descsize = sizeof(struct sha256_state), 348 .statesize = sizeof(struct sha256_state), 349 .base = { 350 .cra_name = "sha256", 351 .cra_driver_name= "sha256-generic", 352 .cra_flags = CRYPTO_ALG_TYPE_SHASH, 353 .cra_blocksize = SHA256_BLOCK_SIZE, 354 .cra_module = THIS_MODULE, 355 } 356 }, { 357 .digestsize = SHA224_DIGEST_SIZE, 358 .init = sha224_init, 359 .update = crypto_sha256_update, 360 .final = sha224_final, 361 .descsize = sizeof(struct sha256_state), 362 .base = { 363 .cra_name = "sha224", 364 .cra_driver_name= "sha224-generic", 365 .cra_flags = CRYPTO_ALG_TYPE_SHASH, 366 .cra_blocksize = SHA224_BLOCK_SIZE, 367 .cra_module = THIS_MODULE, 368 } 369 } }; 370 371 static int __init sha256_generic_mod_init(void) 372 { 373 return crypto_register_shashes(sha256_algs, ARRAY_SIZE(sha256_algs)); 374 } 375 376 static void __exit sha256_generic_mod_fini(void) 377 { 378 crypto_unregister_shashes(sha256_algs, ARRAY_SIZE(sha256_algs)); 379 } 380 381 module_init(sha256_generic_mod_init); 382 module_exit(sha256_generic_mod_fini); 383 384 MODULE_LICENSE("GPL"); 385 MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm"); 386 387 MODULE_ALIAS("sha224"); 388 MODULE_ALIAS("sha256"); 389