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 <[email protected]>. 7 * 8 * Copyright (c) Jean-Luc Cooke <[email protected]> 9 * Copyright (c) Andrew McDonald <[email protected]> 10 * Copyright (c) 2002 James Morris <[email protected]> 11 * Copyright (c) 2014 Red Hat Inc. 12 */ 13 14 #include <linux/bitops.h> 15 #include <linux/export.h> 16 #include <linux/string.h> 17 #include <crypto/sha256.h> 18 #include <asm/unaligned.h> 19 20 static inline u32 Ch(u32 x, u32 y, u32 z) 21 { 22 return z ^ (x & (y ^ z)); 23 } 24 25 static inline u32 Maj(u32 x, u32 y, u32 z) 26 { 27 return (x & y) | (z & (x | y)); 28 } 29 30 #define e0(x) (ror32(x, 2) ^ ror32(x, 13) ^ ror32(x, 22)) 31 #define e1(x) (ror32(x, 6) ^ ror32(x, 11) ^ ror32(x, 25)) 32 #define s0(x) (ror32(x, 7) ^ ror32(x, 18) ^ (x >> 3)) 33 #define s1(x) (ror32(x, 17) ^ ror32(x, 19) ^ (x >> 10)) 34 35 static inline void LOAD_OP(int I, u32 *W, const u8 *input) 36 { 37 W[I] = get_unaligned_be32((__u32 *)input + I); 38 } 39 40 static inline void BLEND_OP(int I, u32 *W) 41 { 42 W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16]; 43 } 44 45 static void sha256_transform(u32 *state, const u8 *input) 46 { 47 u32 a, b, c, d, e, f, g, h, t1, t2; 48 u32 W[64]; 49 int i; 50 51 /* load the input */ 52 for (i = 0; i < 16; i++) 53 LOAD_OP(i, W, input); 54 55 /* now blend */ 56 for (i = 16; i < 64; i++) 57 BLEND_OP(i, W); 58 59 /* load the state into our registers */ 60 a = state[0]; b = state[1]; c = state[2]; d = state[3]; 61 e = state[4]; f = state[5]; g = state[6]; h = state[7]; 62 63 /* now iterate */ 64 t1 = h + e1(e) + Ch(e, f, g) + 0x428a2f98 + W[0]; 65 t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2; 66 t1 = g + e1(d) + Ch(d, e, f) + 0x71374491 + W[1]; 67 t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2; 68 t1 = f + e1(c) + Ch(c, d, e) + 0xb5c0fbcf + W[2]; 69 t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2; 70 t1 = e + e1(b) + Ch(b, c, d) + 0xe9b5dba5 + W[3]; 71 t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2; 72 t1 = d + e1(a) + Ch(a, b, c) + 0x3956c25b + W[4]; 73 t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2; 74 t1 = c + e1(h) + Ch(h, a, b) + 0x59f111f1 + W[5]; 75 t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2; 76 t1 = b + e1(g) + Ch(g, h, a) + 0x923f82a4 + W[6]; 77 t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2; 78 t1 = a + e1(f) + Ch(f, g, h) + 0xab1c5ed5 + W[7]; 79 t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2; 80 81 t1 = h + e1(e) + Ch(e, f, g) + 0xd807aa98 + W[8]; 82 t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2; 83 t1 = g + e1(d) + Ch(d, e, f) + 0x12835b01 + W[9]; 84 t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2; 85 t1 = f + e1(c) + Ch(c, d, e) + 0x243185be + W[10]; 86 t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2; 87 t1 = e + e1(b) + Ch(b, c, d) + 0x550c7dc3 + W[11]; 88 t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2; 89 t1 = d + e1(a) + Ch(a, b, c) + 0x72be5d74 + W[12]; 90 t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2; 91 t1 = c + e1(h) + Ch(h, a, b) + 0x80deb1fe + W[13]; 92 t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2; 93 t1 = b + e1(g) + Ch(g, h, a) + 0x9bdc06a7 + W[14]; 94 t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2; 95 t1 = a + e1(f) + Ch(f, g, h) + 0xc19bf174 + W[15]; 96 t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2; 97 98 t1 = h + e1(e) + Ch(e, f, g) + 0xe49b69c1 + W[16]; 99 t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2; 100 t1 = g + e1(d) + Ch(d, e, f) + 0xefbe4786 + W[17]; 101 t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2; 102 t1 = f + e1(c) + Ch(c, d, e) + 0x0fc19dc6 + W[18]; 103 t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2; 104 t1 = e + e1(b) + Ch(b, c, d) + 0x240ca1cc + W[19]; 105 t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2; 106 t1 = d + e1(a) + Ch(a, b, c) + 0x2de92c6f + W[20]; 107 t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2; 108 t1 = c + e1(h) + Ch(h, a, b) + 0x4a7484aa + W[21]; 109 t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2; 110 t1 = b + e1(g) + Ch(g, h, a) + 0x5cb0a9dc + W[22]; 111 t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2; 112 t1 = a + e1(f) + Ch(f, g, h) + 0x76f988da + W[23]; 113 t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2; 114 115 t1 = h + e1(e) + Ch(e, f, g) + 0x983e5152 + W[24]; 116 t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2; 117 t1 = g + e1(d) + Ch(d, e, f) + 0xa831c66d + W[25]; 118 t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2; 119 t1 = f + e1(c) + Ch(c, d, e) + 0xb00327c8 + W[26]; 120 t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2; 121 t1 = e + e1(b) + Ch(b, c, d) + 0xbf597fc7 + W[27]; 122 t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2; 123 t1 = d + e1(a) + Ch(a, b, c) + 0xc6e00bf3 + W[28]; 124 t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2; 125 t1 = c + e1(h) + Ch(h, a, b) + 0xd5a79147 + W[29]; 126 t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2; 127 t1 = b + e1(g) + Ch(g, h, a) + 0x06ca6351 + W[30]; 128 t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2; 129 t1 = a + e1(f) + Ch(f, g, h) + 0x14292967 + W[31]; 130 t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2; 131 132 t1 = h + e1(e) + Ch(e, f, g) + 0x27b70a85 + W[32]; 133 t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2; 134 t1 = g + e1(d) + Ch(d, e, f) + 0x2e1b2138 + W[33]; 135 t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2; 136 t1 = f + e1(c) + Ch(c, d, e) + 0x4d2c6dfc + W[34]; 137 t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2; 138 t1 = e + e1(b) + Ch(b, c, d) + 0x53380d13 + W[35]; 139 t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2; 140 t1 = d + e1(a) + Ch(a, b, c) + 0x650a7354 + W[36]; 141 t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2; 142 t1 = c + e1(h) + Ch(h, a, b) + 0x766a0abb + W[37]; 143 t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2; 144 t1 = b + e1(g) + Ch(g, h, a) + 0x81c2c92e + W[38]; 145 t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2; 146 t1 = a + e1(f) + Ch(f, g, h) + 0x92722c85 + W[39]; 147 t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2; 148 149 t1 = h + e1(e) + Ch(e, f, g) + 0xa2bfe8a1 + W[40]; 150 t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2; 151 t1 = g + e1(d) + Ch(d, e, f) + 0xa81a664b + W[41]; 152 t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2; 153 t1 = f + e1(c) + Ch(c, d, e) + 0xc24b8b70 + W[42]; 154 t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2; 155 t1 = e + e1(b) + Ch(b, c, d) + 0xc76c51a3 + W[43]; 156 t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2; 157 t1 = d + e1(a) + Ch(a, b, c) + 0xd192e819 + W[44]; 158 t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2; 159 t1 = c + e1(h) + Ch(h, a, b) + 0xd6990624 + W[45]; 160 t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2; 161 t1 = b + e1(g) + Ch(g, h, a) + 0xf40e3585 + W[46]; 162 t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2; 163 t1 = a + e1(f) + Ch(f, g, h) + 0x106aa070 + W[47]; 164 t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2; 165 166 t1 = h + e1(e) + Ch(e, f, g) + 0x19a4c116 + W[48]; 167 t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2; 168 t1 = g + e1(d) + Ch(d, e, f) + 0x1e376c08 + W[49]; 169 t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2; 170 t1 = f + e1(c) + Ch(c, d, e) + 0x2748774c + W[50]; 171 t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2; 172 t1 = e + e1(b) + Ch(b, c, d) + 0x34b0bcb5 + W[51]; 173 t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2; 174 t1 = d + e1(a) + Ch(a, b, c) + 0x391c0cb3 + W[52]; 175 t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2; 176 t1 = c + e1(h) + Ch(h, a, b) + 0x4ed8aa4a + W[53]; 177 t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2; 178 t1 = b + e1(g) + Ch(g, h, a) + 0x5b9cca4f + W[54]; 179 t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2; 180 t1 = a + e1(f) + Ch(f, g, h) + 0x682e6ff3 + W[55]; 181 t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2; 182 183 t1 = h + e1(e) + Ch(e, f, g) + 0x748f82ee + W[56]; 184 t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2; 185 t1 = g + e1(d) + Ch(d, e, f) + 0x78a5636f + W[57]; 186 t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2; 187 t1 = f + e1(c) + Ch(c, d, e) + 0x84c87814 + W[58]; 188 t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2; 189 t1 = e + e1(b) + Ch(b, c, d) + 0x8cc70208 + W[59]; 190 t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2; 191 t1 = d + e1(a) + Ch(a, b, c) + 0x90befffa + W[60]; 192 t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2; 193 t1 = c + e1(h) + Ch(h, a, b) + 0xa4506ceb + W[61]; 194 t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2; 195 t1 = b + e1(g) + Ch(g, h, a) + 0xbef9a3f7 + W[62]; 196 t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2; 197 t1 = a + e1(f) + Ch(f, g, h) + 0xc67178f2 + W[63]; 198 t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2; 199 200 state[0] += a; state[1] += b; state[2] += c; state[3] += d; 201 state[4] += e; state[5] += f; state[6] += g; state[7] += h; 202 203 /* clear any sensitive info... */ 204 a = b = c = d = e = f = g = h = t1 = t2 = 0; 205 memzero_explicit(W, 64 * sizeof(u32)); 206 } 207 208 int sha256_init(struct sha256_state *sctx) 209 { 210 sctx->state[0] = SHA256_H0; 211 sctx->state[1] = SHA256_H1; 212 sctx->state[2] = SHA256_H2; 213 sctx->state[3] = SHA256_H3; 214 sctx->state[4] = SHA256_H4; 215 sctx->state[5] = SHA256_H5; 216 sctx->state[6] = SHA256_H6; 217 sctx->state[7] = SHA256_H7; 218 sctx->count = 0; 219 220 return 0; 221 } 222 EXPORT_SYMBOL(sha256_init); 223 224 int sha256_update(struct sha256_state *sctx, const u8 *data, unsigned int len) 225 { 226 unsigned int partial, done; 227 const u8 *src; 228 229 partial = sctx->count & 0x3f; 230 sctx->count += len; 231 done = 0; 232 src = data; 233 234 if ((partial + len) > 63) { 235 if (partial) { 236 done = -partial; 237 memcpy(sctx->buf + partial, data, done + 64); 238 src = sctx->buf; 239 } 240 241 do { 242 sha256_transform(sctx->state, src); 243 done += 64; 244 src = data + done; 245 } while (done + 63 < len); 246 247 partial = 0; 248 } 249 memcpy(sctx->buf + partial, src, len - done); 250 251 return 0; 252 } 253 EXPORT_SYMBOL(sha256_update); 254 255 int sha256_final(struct sha256_state *sctx, u8 *out) 256 { 257 __be32 *dst = (__be32 *)out; 258 __be64 bits; 259 unsigned int index, pad_len; 260 int i; 261 static const u8 padding[64] = { 0x80, }; 262 263 /* Save number of bits */ 264 bits = cpu_to_be64(sctx->count << 3); 265 266 /* Pad out to 56 mod 64. */ 267 index = sctx->count & 0x3f; 268 pad_len = (index < 56) ? (56 - index) : ((64+56) - index); 269 sha256_update(sctx, padding, pad_len); 270 271 /* Append length (before padding) */ 272 sha256_update(sctx, (const u8 *)&bits, sizeof(bits)); 273 274 /* Store state in digest */ 275 for (i = 0; i < 8; i++) 276 put_unaligned_be32(sctx->state[i], &dst[i]); 277 278 /* Zeroize sensitive information. */ 279 memset(sctx, 0, sizeof(*sctx)); 280 281 return 0; 282 } 283 EXPORT_SYMBOL(sha256_final); 284