1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * SHA-256, as specified in 4 * http://csrc.nist.gov/groups/STM/cavp/documents/shs/sha256-384-512.pdf 5 * 6 * SHA-256 code by Jean-Luc Cooke <jlcooke@certainkey.com>. 7 * 8 * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com> 9 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> 10 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> 11 * Copyright (c) 2014 Red Hat Inc. 12 */ 13 14 #include <linux/bitops.h> 15 #include <linux/export.h> 16 #include <linux/module.h> 17 #include <linux/string.h> 18 #include <crypto/sha.h> 19 #include <asm/unaligned.h> 20 21 static inline u32 Ch(u32 x, u32 y, u32 z) 22 { 23 return z ^ (x & (y ^ z)); 24 } 25 26 static inline u32 Maj(u32 x, u32 y, u32 z) 27 { 28 return (x & y) | (z & (x | y)); 29 } 30 31 #define e0(x) (ror32(x, 2) ^ ror32(x, 13) ^ ror32(x, 22)) 32 #define e1(x) (ror32(x, 6) ^ ror32(x, 11) ^ ror32(x, 25)) 33 #define s0(x) (ror32(x, 7) ^ ror32(x, 18) ^ (x >> 3)) 34 #define s1(x) (ror32(x, 17) ^ ror32(x, 19) ^ (x >> 10)) 35 36 static inline void LOAD_OP(int I, u32 *W, const u8 *input) 37 { 38 W[I] = get_unaligned_be32((__u32 *)input + I); 39 } 40 41 static inline void BLEND_OP(int I, u32 *W) 42 { 43 W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16]; 44 } 45 46 static void sha256_transform(u32 *state, const u8 *input) 47 { 48 u32 a, b, c, d, e, f, g, h, t1, t2; 49 u32 W[64]; 50 int i; 51 52 /* load the input */ 53 for (i = 0; i < 16; i++) 54 LOAD_OP(i, W, input); 55 56 /* now blend */ 57 for (i = 16; i < 64; i++) 58 BLEND_OP(i, W); 59 60 /* load the state into our registers */ 61 a = state[0]; b = state[1]; c = state[2]; d = state[3]; 62 e = state[4]; f = state[5]; g = state[6]; h = state[7]; 63 64 /* now iterate */ 65 t1 = h + e1(e) + Ch(e, f, g) + 0x428a2f98 + W[0]; 66 t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2; 67 t1 = g + e1(d) + Ch(d, e, f) + 0x71374491 + W[1]; 68 t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2; 69 t1 = f + e1(c) + Ch(c, d, e) + 0xb5c0fbcf + W[2]; 70 t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2; 71 t1 = e + e1(b) + Ch(b, c, d) + 0xe9b5dba5 + W[3]; 72 t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2; 73 t1 = d + e1(a) + Ch(a, b, c) + 0x3956c25b + W[4]; 74 t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2; 75 t1 = c + e1(h) + Ch(h, a, b) + 0x59f111f1 + W[5]; 76 t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2; 77 t1 = b + e1(g) + Ch(g, h, a) + 0x923f82a4 + W[6]; 78 t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2; 79 t1 = a + e1(f) + Ch(f, g, h) + 0xab1c5ed5 + W[7]; 80 t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2; 81 82 t1 = h + e1(e) + Ch(e, f, g) + 0xd807aa98 + W[8]; 83 t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2; 84 t1 = g + e1(d) + Ch(d, e, f) + 0x12835b01 + W[9]; 85 t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2; 86 t1 = f + e1(c) + Ch(c, d, e) + 0x243185be + W[10]; 87 t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2; 88 t1 = e + e1(b) + Ch(b, c, d) + 0x550c7dc3 + W[11]; 89 t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2; 90 t1 = d + e1(a) + Ch(a, b, c) + 0x72be5d74 + W[12]; 91 t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2; 92 t1 = c + e1(h) + Ch(h, a, b) + 0x80deb1fe + W[13]; 93 t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2; 94 t1 = b + e1(g) + Ch(g, h, a) + 0x9bdc06a7 + W[14]; 95 t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2; 96 t1 = a + e1(f) + Ch(f, g, h) + 0xc19bf174 + W[15]; 97 t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2; 98 99 t1 = h + e1(e) + Ch(e, f, g) + 0xe49b69c1 + W[16]; 100 t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2; 101 t1 = g + e1(d) + Ch(d, e, f) + 0xefbe4786 + W[17]; 102 t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2; 103 t1 = f + e1(c) + Ch(c, d, e) + 0x0fc19dc6 + W[18]; 104 t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2; 105 t1 = e + e1(b) + Ch(b, c, d) + 0x240ca1cc + W[19]; 106 t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2; 107 t1 = d + e1(a) + Ch(a, b, c) + 0x2de92c6f + W[20]; 108 t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2; 109 t1 = c + e1(h) + Ch(h, a, b) + 0x4a7484aa + W[21]; 110 t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2; 111 t1 = b + e1(g) + Ch(g, h, a) + 0x5cb0a9dc + W[22]; 112 t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2; 113 t1 = a + e1(f) + Ch(f, g, h) + 0x76f988da + W[23]; 114 t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2; 115 116 t1 = h + e1(e) + Ch(e, f, g) + 0x983e5152 + W[24]; 117 t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2; 118 t1 = g + e1(d) + Ch(d, e, f) + 0xa831c66d + W[25]; 119 t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2; 120 t1 = f + e1(c) + Ch(c, d, e) + 0xb00327c8 + W[26]; 121 t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2; 122 t1 = e + e1(b) + Ch(b, c, d) + 0xbf597fc7 + W[27]; 123 t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2; 124 t1 = d + e1(a) + Ch(a, b, c) + 0xc6e00bf3 + W[28]; 125 t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2; 126 t1 = c + e1(h) + Ch(h, a, b) + 0xd5a79147 + W[29]; 127 t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2; 128 t1 = b + e1(g) + Ch(g, h, a) + 0x06ca6351 + W[30]; 129 t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2; 130 t1 = a + e1(f) + Ch(f, g, h) + 0x14292967 + W[31]; 131 t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2; 132 133 t1 = h + e1(e) + Ch(e, f, g) + 0x27b70a85 + W[32]; 134 t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2; 135 t1 = g + e1(d) + Ch(d, e, f) + 0x2e1b2138 + W[33]; 136 t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2; 137 t1 = f + e1(c) + Ch(c, d, e) + 0x4d2c6dfc + W[34]; 138 t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2; 139 t1 = e + e1(b) + Ch(b, c, d) + 0x53380d13 + W[35]; 140 t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2; 141 t1 = d + e1(a) + Ch(a, b, c) + 0x650a7354 + W[36]; 142 t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2; 143 t1 = c + e1(h) + Ch(h, a, b) + 0x766a0abb + W[37]; 144 t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2; 145 t1 = b + e1(g) + Ch(g, h, a) + 0x81c2c92e + W[38]; 146 t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2; 147 t1 = a + e1(f) + Ch(f, g, h) + 0x92722c85 + W[39]; 148 t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2; 149 150 t1 = h + e1(e) + Ch(e, f, g) + 0xa2bfe8a1 + W[40]; 151 t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2; 152 t1 = g + e1(d) + Ch(d, e, f) + 0xa81a664b + W[41]; 153 t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2; 154 t1 = f + e1(c) + Ch(c, d, e) + 0xc24b8b70 + W[42]; 155 t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2; 156 t1 = e + e1(b) + Ch(b, c, d) + 0xc76c51a3 + W[43]; 157 t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2; 158 t1 = d + e1(a) + Ch(a, b, c) + 0xd192e819 + W[44]; 159 t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2; 160 t1 = c + e1(h) + Ch(h, a, b) + 0xd6990624 + W[45]; 161 t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2; 162 t1 = b + e1(g) + Ch(g, h, a) + 0xf40e3585 + W[46]; 163 t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2; 164 t1 = a + e1(f) + Ch(f, g, h) + 0x106aa070 + W[47]; 165 t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2; 166 167 t1 = h + e1(e) + Ch(e, f, g) + 0x19a4c116 + W[48]; 168 t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2; 169 t1 = g + e1(d) + Ch(d, e, f) + 0x1e376c08 + W[49]; 170 t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2; 171 t1 = f + e1(c) + Ch(c, d, e) + 0x2748774c + W[50]; 172 t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2; 173 t1 = e + e1(b) + Ch(b, c, d) + 0x34b0bcb5 + W[51]; 174 t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2; 175 t1 = d + e1(a) + Ch(a, b, c) + 0x391c0cb3 + W[52]; 176 t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2; 177 t1 = c + e1(h) + Ch(h, a, b) + 0x4ed8aa4a + W[53]; 178 t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2; 179 t1 = b + e1(g) + Ch(g, h, a) + 0x5b9cca4f + W[54]; 180 t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2; 181 t1 = a + e1(f) + Ch(f, g, h) + 0x682e6ff3 + W[55]; 182 t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2; 183 184 t1 = h + e1(e) + Ch(e, f, g) + 0x748f82ee + W[56]; 185 t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2; 186 t1 = g + e1(d) + Ch(d, e, f) + 0x78a5636f + W[57]; 187 t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2; 188 t1 = f + e1(c) + Ch(c, d, e) + 0x84c87814 + W[58]; 189 t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2; 190 t1 = e + e1(b) + Ch(b, c, d) + 0x8cc70208 + W[59]; 191 t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2; 192 t1 = d + e1(a) + Ch(a, b, c) + 0x90befffa + W[60]; 193 t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2; 194 t1 = c + e1(h) + Ch(h, a, b) + 0xa4506ceb + W[61]; 195 t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2; 196 t1 = b + e1(g) + Ch(g, h, a) + 0xbef9a3f7 + W[62]; 197 t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2; 198 t1 = a + e1(f) + Ch(f, g, h) + 0xc67178f2 + W[63]; 199 t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2; 200 201 state[0] += a; state[1] += b; state[2] += c; state[3] += d; 202 state[4] += e; state[5] += f; state[6] += g; state[7] += h; 203 204 /* clear any sensitive info... */ 205 a = b = c = d = e = f = g = h = t1 = t2 = 0; 206 memzero_explicit(W, 64 * sizeof(u32)); 207 } 208 209 void sha256_update(struct sha256_state *sctx, const u8 *data, unsigned int len) 210 { 211 unsigned int partial, done; 212 const u8 *src; 213 214 partial = sctx->count & 0x3f; 215 sctx->count += len; 216 done = 0; 217 src = data; 218 219 if ((partial + len) > 63) { 220 if (partial) { 221 done = -partial; 222 memcpy(sctx->buf + partial, data, done + 64); 223 src = sctx->buf; 224 } 225 226 do { 227 sha256_transform(sctx->state, src); 228 done += 64; 229 src = data + done; 230 } while (done + 63 < len); 231 232 partial = 0; 233 } 234 memcpy(sctx->buf + partial, src, len - done); 235 } 236 EXPORT_SYMBOL(sha256_update); 237 238 void sha224_update(struct sha256_state *sctx, const u8 *data, unsigned int len) 239 { 240 sha256_update(sctx, data, len); 241 } 242 EXPORT_SYMBOL(sha224_update); 243 244 static void __sha256_final(struct sha256_state *sctx, u8 *out, int digest_words) 245 { 246 __be32 *dst = (__be32 *)out; 247 __be64 bits; 248 unsigned int index, pad_len; 249 int i; 250 static const u8 padding[64] = { 0x80, }; 251 252 /* Save number of bits */ 253 bits = cpu_to_be64(sctx->count << 3); 254 255 /* Pad out to 56 mod 64. */ 256 index = sctx->count & 0x3f; 257 pad_len = (index < 56) ? (56 - index) : ((64+56) - index); 258 sha256_update(sctx, padding, pad_len); 259 260 /* Append length (before padding) */ 261 sha256_update(sctx, (const u8 *)&bits, sizeof(bits)); 262 263 /* Store state in digest */ 264 for (i = 0; i < digest_words; i++) 265 put_unaligned_be32(sctx->state[i], &dst[i]); 266 267 /* Zeroize sensitive information. */ 268 memset(sctx, 0, sizeof(*sctx)); 269 } 270 271 void sha256_final(struct sha256_state *sctx, u8 *out) 272 { 273 __sha256_final(sctx, out, 8); 274 } 275 EXPORT_SYMBOL(sha256_final); 276 277 void sha224_final(struct sha256_state *sctx, u8 *out) 278 { 279 __sha256_final(sctx, out, 7); 280 } 281 EXPORT_SYMBOL(sha224_final); 282 283 void sha256(const u8 *data, unsigned int len, u8 *out) 284 { 285 struct sha256_state sctx; 286 287 sha256_init(&sctx); 288 sha256_update(&sctx, data, len); 289 sha256_final(&sctx, out); 290 } 291 EXPORT_SYMBOL(sha256); 292 293 MODULE_LICENSE("GPL"); 294