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