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 #include <asm/unaligned.h> 28 29 static inline u32 Ch(u32 x, u32 y, u32 z) 30 { 31 return z ^ (x & (y ^ z)); 32 } 33 34 static inline u32 Maj(u32 x, u32 y, u32 z) 35 { 36 return (x & y) | (z & (x | y)); 37 } 38 39 #define e0(x) (ror32(x, 2) ^ ror32(x,13) ^ ror32(x,22)) 40 #define e1(x) (ror32(x, 6) ^ ror32(x,11) ^ ror32(x,25)) 41 #define s0(x) (ror32(x, 7) ^ ror32(x,18) ^ (x >> 3)) 42 #define s1(x) (ror32(x,17) ^ ror32(x,19) ^ (x >> 10)) 43 44 static inline void LOAD_OP(int I, u32 *W, const u8 *input) 45 { 46 W[I] = get_unaligned_be32((__u32 *)input + I); 47 } 48 49 static inline void BLEND_OP(int I, u32 *W) 50 { 51 W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16]; 52 } 53 54 static void sha256_transform(u32 *state, const u8 *input) 55 { 56 u32 a, b, c, d, e, f, g, h, t1, t2; 57 u32 W[64]; 58 int i; 59 60 /* load the input */ 61 for (i = 0; i < 16; i++) 62 LOAD_OP(i, W, input); 63 64 /* now blend */ 65 for (i = 16; i < 64; i++) 66 BLEND_OP(i, W); 67 68 /* load the state into our registers */ 69 a=state[0]; b=state[1]; c=state[2]; d=state[3]; 70 e=state[4]; f=state[5]; g=state[6]; h=state[7]; 71 72 /* now iterate */ 73 t1 = h + e1(e) + Ch(e,f,g) + 0x428a2f98 + W[ 0]; 74 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 75 t1 = g + e1(d) + Ch(d,e,f) + 0x71374491 + W[ 1]; 76 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 77 t1 = f + e1(c) + Ch(c,d,e) + 0xb5c0fbcf + W[ 2]; 78 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 79 t1 = e + e1(b) + Ch(b,c,d) + 0xe9b5dba5 + W[ 3]; 80 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 81 t1 = d + e1(a) + Ch(a,b,c) + 0x3956c25b + W[ 4]; 82 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 83 t1 = c + e1(h) + Ch(h,a,b) + 0x59f111f1 + W[ 5]; 84 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 85 t1 = b + e1(g) + Ch(g,h,a) + 0x923f82a4 + W[ 6]; 86 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 87 t1 = a + e1(f) + Ch(f,g,h) + 0xab1c5ed5 + W[ 7]; 88 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 89 90 t1 = h + e1(e) + Ch(e,f,g) + 0xd807aa98 + W[ 8]; 91 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 92 t1 = g + e1(d) + Ch(d,e,f) + 0x12835b01 + W[ 9]; 93 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 94 t1 = f + e1(c) + Ch(c,d,e) + 0x243185be + W[10]; 95 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 96 t1 = e + e1(b) + Ch(b,c,d) + 0x550c7dc3 + W[11]; 97 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 98 t1 = d + e1(a) + Ch(a,b,c) + 0x72be5d74 + W[12]; 99 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 100 t1 = c + e1(h) + Ch(h,a,b) + 0x80deb1fe + W[13]; 101 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 102 t1 = b + e1(g) + Ch(g,h,a) + 0x9bdc06a7 + W[14]; 103 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 104 t1 = a + e1(f) + Ch(f,g,h) + 0xc19bf174 + W[15]; 105 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 106 107 t1 = h + e1(e) + Ch(e,f,g) + 0xe49b69c1 + W[16]; 108 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 109 t1 = g + e1(d) + Ch(d,e,f) + 0xefbe4786 + W[17]; 110 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 111 t1 = f + e1(c) + Ch(c,d,e) + 0x0fc19dc6 + W[18]; 112 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 113 t1 = e + e1(b) + Ch(b,c,d) + 0x240ca1cc + W[19]; 114 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 115 t1 = d + e1(a) + Ch(a,b,c) + 0x2de92c6f + W[20]; 116 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 117 t1 = c + e1(h) + Ch(h,a,b) + 0x4a7484aa + W[21]; 118 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 119 t1 = b + e1(g) + Ch(g,h,a) + 0x5cb0a9dc + W[22]; 120 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 121 t1 = a + e1(f) + Ch(f,g,h) + 0x76f988da + W[23]; 122 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 123 124 t1 = h + e1(e) + Ch(e,f,g) + 0x983e5152 + W[24]; 125 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 126 t1 = g + e1(d) + Ch(d,e,f) + 0xa831c66d + W[25]; 127 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 128 t1 = f + e1(c) + Ch(c,d,e) + 0xb00327c8 + W[26]; 129 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 130 t1 = e + e1(b) + Ch(b,c,d) + 0xbf597fc7 + W[27]; 131 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 132 t1 = d + e1(a) + Ch(a,b,c) + 0xc6e00bf3 + W[28]; 133 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 134 t1 = c + e1(h) + Ch(h,a,b) + 0xd5a79147 + W[29]; 135 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 136 t1 = b + e1(g) + Ch(g,h,a) + 0x06ca6351 + W[30]; 137 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 138 t1 = a + e1(f) + Ch(f,g,h) + 0x14292967 + W[31]; 139 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 140 141 t1 = h + e1(e) + Ch(e,f,g) + 0x27b70a85 + W[32]; 142 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 143 t1 = g + e1(d) + Ch(d,e,f) + 0x2e1b2138 + W[33]; 144 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 145 t1 = f + e1(c) + Ch(c,d,e) + 0x4d2c6dfc + W[34]; 146 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 147 t1 = e + e1(b) + Ch(b,c,d) + 0x53380d13 + W[35]; 148 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 149 t1 = d + e1(a) + Ch(a,b,c) + 0x650a7354 + W[36]; 150 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 151 t1 = c + e1(h) + Ch(h,a,b) + 0x766a0abb + W[37]; 152 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 153 t1 = b + e1(g) + Ch(g,h,a) + 0x81c2c92e + W[38]; 154 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 155 t1 = a + e1(f) + Ch(f,g,h) + 0x92722c85 + W[39]; 156 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 157 158 t1 = h + e1(e) + Ch(e,f,g) + 0xa2bfe8a1 + W[40]; 159 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 160 t1 = g + e1(d) + Ch(d,e,f) + 0xa81a664b + W[41]; 161 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 162 t1 = f + e1(c) + Ch(c,d,e) + 0xc24b8b70 + W[42]; 163 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 164 t1 = e + e1(b) + Ch(b,c,d) + 0xc76c51a3 + W[43]; 165 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 166 t1 = d + e1(a) + Ch(a,b,c) + 0xd192e819 + W[44]; 167 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 168 t1 = c + e1(h) + Ch(h,a,b) + 0xd6990624 + W[45]; 169 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 170 t1 = b + e1(g) + Ch(g,h,a) + 0xf40e3585 + W[46]; 171 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 172 t1 = a + e1(f) + Ch(f,g,h) + 0x106aa070 + W[47]; 173 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 174 175 t1 = h + e1(e) + Ch(e,f,g) + 0x19a4c116 + W[48]; 176 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 177 t1 = g + e1(d) + Ch(d,e,f) + 0x1e376c08 + W[49]; 178 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 179 t1 = f + e1(c) + Ch(c,d,e) + 0x2748774c + W[50]; 180 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 181 t1 = e + e1(b) + Ch(b,c,d) + 0x34b0bcb5 + W[51]; 182 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 183 t1 = d + e1(a) + Ch(a,b,c) + 0x391c0cb3 + W[52]; 184 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 185 t1 = c + e1(h) + Ch(h,a,b) + 0x4ed8aa4a + W[53]; 186 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 187 t1 = b + e1(g) + Ch(g,h,a) + 0x5b9cca4f + W[54]; 188 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 189 t1 = a + e1(f) + Ch(f,g,h) + 0x682e6ff3 + W[55]; 190 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 191 192 t1 = h + e1(e) + Ch(e,f,g) + 0x748f82ee + W[56]; 193 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 194 t1 = g + e1(d) + Ch(d,e,f) + 0x78a5636f + W[57]; 195 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 196 t1 = f + e1(c) + Ch(c,d,e) + 0x84c87814 + W[58]; 197 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 198 t1 = e + e1(b) + Ch(b,c,d) + 0x8cc70208 + W[59]; 199 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 200 t1 = d + e1(a) + Ch(a,b,c) + 0x90befffa + W[60]; 201 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 202 t1 = c + e1(h) + Ch(h,a,b) + 0xa4506ceb + W[61]; 203 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 204 t1 = b + e1(g) + Ch(g,h,a) + 0xbef9a3f7 + W[62]; 205 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 206 t1 = a + e1(f) + Ch(f,g,h) + 0xc67178f2 + W[63]; 207 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 208 209 state[0] += a; state[1] += b; state[2] += c; state[3] += d; 210 state[4] += e; state[5] += f; state[6] += g; state[7] += h; 211 212 /* clear any sensitive info... */ 213 a = b = c = d = e = f = g = h = t1 = t2 = 0; 214 memzero_explicit(W, 64 * sizeof(u32)); 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 memzero_explicit(D, 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_CRYPTO("sha224"); 388 MODULE_ALIAS_CRYPTO("sha224-generic"); 389 MODULE_ALIAS_CRYPTO("sha256"); 390 MODULE_ALIAS_CRYPTO("sha256-generic"); 391