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 <crypto/sha256_base.h> 27 #include <asm/byteorder.h> 28 #include <asm/unaligned.h> 29 30 const u8 sha224_zero_message_hash[SHA224_DIGEST_SIZE] = { 31 0xd1, 0x4a, 0x02, 0x8c, 0x2a, 0x3a, 0x2b, 0xc9, 0x47, 32 0x61, 0x02, 0xbb, 0x28, 0x82, 0x34, 0xc4, 0x15, 0xa2, 33 0xb0, 0x1f, 0x82, 0x8e, 0xa6, 0x2a, 0xc5, 0xb3, 0xe4, 34 0x2f 35 }; 36 EXPORT_SYMBOL_GPL(sha224_zero_message_hash); 37 38 const u8 sha256_zero_message_hash[SHA256_DIGEST_SIZE] = { 39 0xe3, 0xb0, 0xc4, 0x42, 0x98, 0xfc, 0x1c, 0x14, 40 0x9a, 0xfb, 0xf4, 0xc8, 0x99, 0x6f, 0xb9, 0x24, 41 0x27, 0xae, 0x41, 0xe4, 0x64, 0x9b, 0x93, 0x4c, 42 0xa4, 0x95, 0x99, 0x1b, 0x78, 0x52, 0xb8, 0x55 43 }; 44 EXPORT_SYMBOL_GPL(sha256_zero_message_hash); 45 46 static inline u32 Ch(u32 x, u32 y, u32 z) 47 { 48 return z ^ (x & (y ^ z)); 49 } 50 51 static inline u32 Maj(u32 x, u32 y, u32 z) 52 { 53 return (x & y) | (z & (x | y)); 54 } 55 56 #define e0(x) (ror32(x, 2) ^ ror32(x,13) ^ ror32(x,22)) 57 #define e1(x) (ror32(x, 6) ^ ror32(x,11) ^ ror32(x,25)) 58 #define s0(x) (ror32(x, 7) ^ ror32(x,18) ^ (x >> 3)) 59 #define s1(x) (ror32(x,17) ^ ror32(x,19) ^ (x >> 10)) 60 61 static inline void LOAD_OP(int I, u32 *W, const u8 *input) 62 { 63 W[I] = get_unaligned_be32((__u32 *)input + I); 64 } 65 66 static inline void BLEND_OP(int I, u32 *W) 67 { 68 W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16]; 69 } 70 71 static void sha256_transform(u32 *state, const u8 *input) 72 { 73 u32 a, b, c, d, e, f, g, h, t1, t2; 74 u32 W[64]; 75 int i; 76 77 /* load the input */ 78 for (i = 0; i < 16; i++) 79 LOAD_OP(i, W, input); 80 81 /* now blend */ 82 for (i = 16; i < 64; i++) 83 BLEND_OP(i, W); 84 85 /* load the state into our registers */ 86 a=state[0]; b=state[1]; c=state[2]; d=state[3]; 87 e=state[4]; f=state[5]; g=state[6]; h=state[7]; 88 89 /* now iterate */ 90 t1 = h + e1(e) + Ch(e,f,g) + 0x428a2f98 + W[ 0]; 91 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 92 t1 = g + e1(d) + Ch(d,e,f) + 0x71374491 + W[ 1]; 93 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 94 t1 = f + e1(c) + Ch(c,d,e) + 0xb5c0fbcf + W[ 2]; 95 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 96 t1 = e + e1(b) + Ch(b,c,d) + 0xe9b5dba5 + W[ 3]; 97 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 98 t1 = d + e1(a) + Ch(a,b,c) + 0x3956c25b + W[ 4]; 99 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 100 t1 = c + e1(h) + Ch(h,a,b) + 0x59f111f1 + W[ 5]; 101 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 102 t1 = b + e1(g) + Ch(g,h,a) + 0x923f82a4 + W[ 6]; 103 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 104 t1 = a + e1(f) + Ch(f,g,h) + 0xab1c5ed5 + W[ 7]; 105 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 106 107 t1 = h + e1(e) + Ch(e,f,g) + 0xd807aa98 + W[ 8]; 108 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 109 t1 = g + e1(d) + Ch(d,e,f) + 0x12835b01 + W[ 9]; 110 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 111 t1 = f + e1(c) + Ch(c,d,e) + 0x243185be + W[10]; 112 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 113 t1 = e + e1(b) + Ch(b,c,d) + 0x550c7dc3 + W[11]; 114 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 115 t1 = d + e1(a) + Ch(a,b,c) + 0x72be5d74 + W[12]; 116 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 117 t1 = c + e1(h) + Ch(h,a,b) + 0x80deb1fe + W[13]; 118 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 119 t1 = b + e1(g) + Ch(g,h,a) + 0x9bdc06a7 + W[14]; 120 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 121 t1 = a + e1(f) + Ch(f,g,h) + 0xc19bf174 + W[15]; 122 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 123 124 t1 = h + e1(e) + Ch(e,f,g) + 0xe49b69c1 + W[16]; 125 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 126 t1 = g + e1(d) + Ch(d,e,f) + 0xefbe4786 + W[17]; 127 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 128 t1 = f + e1(c) + Ch(c,d,e) + 0x0fc19dc6 + W[18]; 129 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 130 t1 = e + e1(b) + Ch(b,c,d) + 0x240ca1cc + W[19]; 131 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 132 t1 = d + e1(a) + Ch(a,b,c) + 0x2de92c6f + W[20]; 133 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 134 t1 = c + e1(h) + Ch(h,a,b) + 0x4a7484aa + W[21]; 135 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 136 t1 = b + e1(g) + Ch(g,h,a) + 0x5cb0a9dc + W[22]; 137 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 138 t1 = a + e1(f) + Ch(f,g,h) + 0x76f988da + W[23]; 139 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 140 141 t1 = h + e1(e) + Ch(e,f,g) + 0x983e5152 + W[24]; 142 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 143 t1 = g + e1(d) + Ch(d,e,f) + 0xa831c66d + W[25]; 144 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 145 t1 = f + e1(c) + Ch(c,d,e) + 0xb00327c8 + W[26]; 146 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 147 t1 = e + e1(b) + Ch(b,c,d) + 0xbf597fc7 + W[27]; 148 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 149 t1 = d + e1(a) + Ch(a,b,c) + 0xc6e00bf3 + W[28]; 150 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 151 t1 = c + e1(h) + Ch(h,a,b) + 0xd5a79147 + W[29]; 152 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 153 t1 = b + e1(g) + Ch(g,h,a) + 0x06ca6351 + W[30]; 154 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 155 t1 = a + e1(f) + Ch(f,g,h) + 0x14292967 + W[31]; 156 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 157 158 t1 = h + e1(e) + Ch(e,f,g) + 0x27b70a85 + W[32]; 159 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 160 t1 = g + e1(d) + Ch(d,e,f) + 0x2e1b2138 + W[33]; 161 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 162 t1 = f + e1(c) + Ch(c,d,e) + 0x4d2c6dfc + W[34]; 163 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 164 t1 = e + e1(b) + Ch(b,c,d) + 0x53380d13 + W[35]; 165 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 166 t1 = d + e1(a) + Ch(a,b,c) + 0x650a7354 + W[36]; 167 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 168 t1 = c + e1(h) + Ch(h,a,b) + 0x766a0abb + W[37]; 169 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 170 t1 = b + e1(g) + Ch(g,h,a) + 0x81c2c92e + W[38]; 171 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 172 t1 = a + e1(f) + Ch(f,g,h) + 0x92722c85 + W[39]; 173 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 174 175 t1 = h + e1(e) + Ch(e,f,g) + 0xa2bfe8a1 + W[40]; 176 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 177 t1 = g + e1(d) + Ch(d,e,f) + 0xa81a664b + W[41]; 178 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 179 t1 = f + e1(c) + Ch(c,d,e) + 0xc24b8b70 + W[42]; 180 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 181 t1 = e + e1(b) + Ch(b,c,d) + 0xc76c51a3 + W[43]; 182 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 183 t1 = d + e1(a) + Ch(a,b,c) + 0xd192e819 + W[44]; 184 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 185 t1 = c + e1(h) + Ch(h,a,b) + 0xd6990624 + W[45]; 186 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 187 t1 = b + e1(g) + Ch(g,h,a) + 0xf40e3585 + W[46]; 188 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 189 t1 = a + e1(f) + Ch(f,g,h) + 0x106aa070 + W[47]; 190 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 191 192 t1 = h + e1(e) + Ch(e,f,g) + 0x19a4c116 + W[48]; 193 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 194 t1 = g + e1(d) + Ch(d,e,f) + 0x1e376c08 + W[49]; 195 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 196 t1 = f + e1(c) + Ch(c,d,e) + 0x2748774c + W[50]; 197 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 198 t1 = e + e1(b) + Ch(b,c,d) + 0x34b0bcb5 + W[51]; 199 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 200 t1 = d + e1(a) + Ch(a,b,c) + 0x391c0cb3 + W[52]; 201 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 202 t1 = c + e1(h) + Ch(h,a,b) + 0x4ed8aa4a + W[53]; 203 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 204 t1 = b + e1(g) + Ch(g,h,a) + 0x5b9cca4f + W[54]; 205 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 206 t1 = a + e1(f) + Ch(f,g,h) + 0x682e6ff3 + W[55]; 207 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 208 209 t1 = h + e1(e) + Ch(e,f,g) + 0x748f82ee + W[56]; 210 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; 211 t1 = g + e1(d) + Ch(d,e,f) + 0x78a5636f + W[57]; 212 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; 213 t1 = f + e1(c) + Ch(c,d,e) + 0x84c87814 + W[58]; 214 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; 215 t1 = e + e1(b) + Ch(b,c,d) + 0x8cc70208 + W[59]; 216 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; 217 t1 = d + e1(a) + Ch(a,b,c) + 0x90befffa + W[60]; 218 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; 219 t1 = c + e1(h) + Ch(h,a,b) + 0xa4506ceb + W[61]; 220 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; 221 t1 = b + e1(g) + Ch(g,h,a) + 0xbef9a3f7 + W[62]; 222 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; 223 t1 = a + e1(f) + Ch(f,g,h) + 0xc67178f2 + W[63]; 224 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; 225 226 state[0] += a; state[1] += b; state[2] += c; state[3] += d; 227 state[4] += e; state[5] += f; state[6] += g; state[7] += h; 228 229 /* clear any sensitive info... */ 230 a = b = c = d = e = f = g = h = t1 = t2 = 0; 231 memzero_explicit(W, 64 * sizeof(u32)); 232 } 233 234 static void sha256_generic_block_fn(struct sha256_state *sst, u8 const *src, 235 int blocks) 236 { 237 while (blocks--) { 238 sha256_transform(sst->state, src); 239 src += SHA256_BLOCK_SIZE; 240 } 241 } 242 243 int crypto_sha256_update(struct shash_desc *desc, const u8 *data, 244 unsigned int len) 245 { 246 return sha256_base_do_update(desc, data, len, sha256_generic_block_fn); 247 } 248 EXPORT_SYMBOL(crypto_sha256_update); 249 250 static int sha256_final(struct shash_desc *desc, u8 *out) 251 { 252 sha256_base_do_finalize(desc, sha256_generic_block_fn); 253 return sha256_base_finish(desc, out); 254 } 255 256 int crypto_sha256_finup(struct shash_desc *desc, const u8 *data, 257 unsigned int len, u8 *hash) 258 { 259 sha256_base_do_update(desc, data, len, sha256_generic_block_fn); 260 return sha256_final(desc, hash); 261 } 262 EXPORT_SYMBOL(crypto_sha256_finup); 263 264 static struct shash_alg sha256_algs[2] = { { 265 .digestsize = SHA256_DIGEST_SIZE, 266 .init = sha256_base_init, 267 .update = crypto_sha256_update, 268 .final = sha256_final, 269 .finup = crypto_sha256_finup, 270 .descsize = sizeof(struct sha256_state), 271 .base = { 272 .cra_name = "sha256", 273 .cra_driver_name= "sha256-generic", 274 .cra_flags = CRYPTO_ALG_TYPE_SHASH, 275 .cra_blocksize = SHA256_BLOCK_SIZE, 276 .cra_module = THIS_MODULE, 277 } 278 }, { 279 .digestsize = SHA224_DIGEST_SIZE, 280 .init = sha224_base_init, 281 .update = crypto_sha256_update, 282 .final = sha256_final, 283 .finup = crypto_sha256_finup, 284 .descsize = sizeof(struct sha256_state), 285 .base = { 286 .cra_name = "sha224", 287 .cra_driver_name= "sha224-generic", 288 .cra_flags = CRYPTO_ALG_TYPE_SHASH, 289 .cra_blocksize = SHA224_BLOCK_SIZE, 290 .cra_module = THIS_MODULE, 291 } 292 } }; 293 294 static int __init sha256_generic_mod_init(void) 295 { 296 return crypto_register_shashes(sha256_algs, ARRAY_SIZE(sha256_algs)); 297 } 298 299 static void __exit sha256_generic_mod_fini(void) 300 { 301 crypto_unregister_shashes(sha256_algs, ARRAY_SIZE(sha256_algs)); 302 } 303 304 module_init(sha256_generic_mod_init); 305 module_exit(sha256_generic_mod_fini); 306 307 MODULE_LICENSE("GPL"); 308 MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm"); 309 310 MODULE_ALIAS_CRYPTO("sha224"); 311 MODULE_ALIAS_CRYPTO("sha224-generic"); 312 MODULE_ALIAS_CRYPTO("sha256"); 313 MODULE_ALIAS_CRYPTO("sha256-generic"); 314