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/string.h> 16 #include <crypto/sha256.h> 17 #include <asm/byteorder.h> 18 19 static inline u32 Ch(u32 x, u32 y, u32 z) 20 { 21 return z ^ (x & (y ^ z)); 22 } 23 24 static inline u32 Maj(u32 x, u32 y, u32 z) 25 { 26 return (x & y) | (z & (x | y)); 27 } 28 29 #define e0(x) (ror32(x, 2) ^ ror32(x, 13) ^ ror32(x, 22)) 30 #define e1(x) (ror32(x, 6) ^ ror32(x, 11) ^ ror32(x, 25)) 31 #define s0(x) (ror32(x, 7) ^ ror32(x, 18) ^ (x >> 3)) 32 #define s1(x) (ror32(x, 17) ^ ror32(x, 19) ^ (x >> 10)) 33 34 static inline void LOAD_OP(int I, u32 *W, const u8 *input) 35 { 36 W[I] = __be32_to_cpu(((__be32 *)(input))[I]); 37 } 38 39 static inline void BLEND_OP(int I, u32 *W) 40 { 41 W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16]; 42 } 43 44 static void sha256_transform(u32 *state, const u8 *input) 45 { 46 u32 a, b, c, d, e, f, g, h, t1, t2; 47 u32 W[64]; 48 int i; 49 50 /* load the input */ 51 for (i = 0; i < 16; i++) 52 LOAD_OP(i, W, input); 53 54 /* now blend */ 55 for (i = 16; i < 64; i++) 56 BLEND_OP(i, W); 57 58 /* load the state into our registers */ 59 a = state[0]; b = state[1]; c = state[2]; d = state[3]; 60 e = state[4]; f = state[5]; g = state[6]; h = state[7]; 61 62 /* now iterate */ 63 t1 = h + e1(e) + Ch(e, f, g) + 0x428a2f98 + W[0]; 64 t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2; 65 t1 = g + e1(d) + Ch(d, e, f) + 0x71374491 + W[1]; 66 t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2; 67 t1 = f + e1(c) + Ch(c, d, e) + 0xb5c0fbcf + W[2]; 68 t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2; 69 t1 = e + e1(b) + Ch(b, c, d) + 0xe9b5dba5 + W[3]; 70 t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2; 71 t1 = d + e1(a) + Ch(a, b, c) + 0x3956c25b + W[4]; 72 t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2; 73 t1 = c + e1(h) + Ch(h, a, b) + 0x59f111f1 + W[5]; 74 t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2; 75 t1 = b + e1(g) + Ch(g, h, a) + 0x923f82a4 + W[6]; 76 t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2; 77 t1 = a + e1(f) + Ch(f, g, h) + 0xab1c5ed5 + W[7]; 78 t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2; 79 80 t1 = h + e1(e) + Ch(e, f, g) + 0xd807aa98 + W[8]; 81 t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2; 82 t1 = g + e1(d) + Ch(d, e, f) + 0x12835b01 + W[9]; 83 t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2; 84 t1 = f + e1(c) + Ch(c, d, e) + 0x243185be + W[10]; 85 t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2; 86 t1 = e + e1(b) + Ch(b, c, d) + 0x550c7dc3 + W[11]; 87 t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2; 88 t1 = d + e1(a) + Ch(a, b, c) + 0x72be5d74 + W[12]; 89 t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2; 90 t1 = c + e1(h) + Ch(h, a, b) + 0x80deb1fe + W[13]; 91 t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2; 92 t1 = b + e1(g) + Ch(g, h, a) + 0x9bdc06a7 + W[14]; 93 t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2; 94 t1 = a + e1(f) + Ch(f, g, h) + 0xc19bf174 + W[15]; 95 t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2; 96 97 t1 = h + e1(e) + Ch(e, f, g) + 0xe49b69c1 + W[16]; 98 t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2; 99 t1 = g + e1(d) + Ch(d, e, f) + 0xefbe4786 + W[17]; 100 t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2; 101 t1 = f + e1(c) + Ch(c, d, e) + 0x0fc19dc6 + W[18]; 102 t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2; 103 t1 = e + e1(b) + Ch(b, c, d) + 0x240ca1cc + W[19]; 104 t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2; 105 t1 = d + e1(a) + Ch(a, b, c) + 0x2de92c6f + W[20]; 106 t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2; 107 t1 = c + e1(h) + Ch(h, a, b) + 0x4a7484aa + W[21]; 108 t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2; 109 t1 = b + e1(g) + Ch(g, h, a) + 0x5cb0a9dc + W[22]; 110 t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2; 111 t1 = a + e1(f) + Ch(f, g, h) + 0x76f988da + W[23]; 112 t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2; 113 114 t1 = h + e1(e) + Ch(e, f, g) + 0x983e5152 + W[24]; 115 t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2; 116 t1 = g + e1(d) + Ch(d, e, f) + 0xa831c66d + W[25]; 117 t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2; 118 t1 = f + e1(c) + Ch(c, d, e) + 0xb00327c8 + W[26]; 119 t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2; 120 t1 = e + e1(b) + Ch(b, c, d) + 0xbf597fc7 + W[27]; 121 t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2; 122 t1 = d + e1(a) + Ch(a, b, c) + 0xc6e00bf3 + W[28]; 123 t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2; 124 t1 = c + e1(h) + Ch(h, a, b) + 0xd5a79147 + W[29]; 125 t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2; 126 t1 = b + e1(g) + Ch(g, h, a) + 0x06ca6351 + W[30]; 127 t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2; 128 t1 = a + e1(f) + Ch(f, g, h) + 0x14292967 + W[31]; 129 t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2; 130 131 t1 = h + e1(e) + Ch(e, f, g) + 0x27b70a85 + W[32]; 132 t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2; 133 t1 = g + e1(d) + Ch(d, e, f) + 0x2e1b2138 + W[33]; 134 t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2; 135 t1 = f + e1(c) + Ch(c, d, e) + 0x4d2c6dfc + W[34]; 136 t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2; 137 t1 = e + e1(b) + Ch(b, c, d) + 0x53380d13 + W[35]; 138 t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2; 139 t1 = d + e1(a) + Ch(a, b, c) + 0x650a7354 + W[36]; 140 t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2; 141 t1 = c + e1(h) + Ch(h, a, b) + 0x766a0abb + W[37]; 142 t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2; 143 t1 = b + e1(g) + Ch(g, h, a) + 0x81c2c92e + W[38]; 144 t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2; 145 t1 = a + e1(f) + Ch(f, g, h) + 0x92722c85 + W[39]; 146 t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2; 147 148 t1 = h + e1(e) + Ch(e, f, g) + 0xa2bfe8a1 + W[40]; 149 t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2; 150 t1 = g + e1(d) + Ch(d, e, f) + 0xa81a664b + W[41]; 151 t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2; 152 t1 = f + e1(c) + Ch(c, d, e) + 0xc24b8b70 + W[42]; 153 t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2; 154 t1 = e + e1(b) + Ch(b, c, d) + 0xc76c51a3 + W[43]; 155 t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2; 156 t1 = d + e1(a) + Ch(a, b, c) + 0xd192e819 + W[44]; 157 t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2; 158 t1 = c + e1(h) + Ch(h, a, b) + 0xd6990624 + W[45]; 159 t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2; 160 t1 = b + e1(g) + Ch(g, h, a) + 0xf40e3585 + W[46]; 161 t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2; 162 t1 = a + e1(f) + Ch(f, g, h) + 0x106aa070 + W[47]; 163 t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2; 164 165 t1 = h + e1(e) + Ch(e, f, g) + 0x19a4c116 + W[48]; 166 t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2; 167 t1 = g + e1(d) + Ch(d, e, f) + 0x1e376c08 + W[49]; 168 t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2; 169 t1 = f + e1(c) + Ch(c, d, e) + 0x2748774c + W[50]; 170 t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2; 171 t1 = e + e1(b) + Ch(b, c, d) + 0x34b0bcb5 + W[51]; 172 t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2; 173 t1 = d + e1(a) + Ch(a, b, c) + 0x391c0cb3 + W[52]; 174 t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2; 175 t1 = c + e1(h) + Ch(h, a, b) + 0x4ed8aa4a + W[53]; 176 t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2; 177 t1 = b + e1(g) + Ch(g, h, a) + 0x5b9cca4f + W[54]; 178 t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2; 179 t1 = a + e1(f) + Ch(f, g, h) + 0x682e6ff3 + W[55]; 180 t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2; 181 182 t1 = h + e1(e) + Ch(e, f, g) + 0x748f82ee + W[56]; 183 t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2; 184 t1 = g + e1(d) + Ch(d, e, f) + 0x78a5636f + W[57]; 185 t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2; 186 t1 = f + e1(c) + Ch(c, d, e) + 0x84c87814 + W[58]; 187 t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2; 188 t1 = e + e1(b) + Ch(b, c, d) + 0x8cc70208 + W[59]; 189 t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2; 190 t1 = d + e1(a) + Ch(a, b, c) + 0x90befffa + W[60]; 191 t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2; 192 t1 = c + e1(h) + Ch(h, a, b) + 0xa4506ceb + W[61]; 193 t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2; 194 t1 = b + e1(g) + Ch(g, h, a) + 0xbef9a3f7 + W[62]; 195 t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2; 196 t1 = a + e1(f) + Ch(f, g, h) + 0xc67178f2 + W[63]; 197 t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2; 198 199 state[0] += a; state[1] += b; state[2] += c; state[3] += d; 200 state[4] += e; state[5] += f; state[6] += g; state[7] += h; 201 202 /* clear any sensitive info... */ 203 a = b = c = d = e = f = g = h = t1 = t2 = 0; 204 memset(W, 0, 64 * sizeof(u32)); 205 } 206 207 int sha256_init(struct sha256_state *sctx) 208 { 209 sctx->state[0] = SHA256_H0; 210 sctx->state[1] = SHA256_H1; 211 sctx->state[2] = SHA256_H2; 212 sctx->state[3] = SHA256_H3; 213 sctx->state[4] = SHA256_H4; 214 sctx->state[5] = SHA256_H5; 215 sctx->state[6] = SHA256_H6; 216 sctx->state[7] = SHA256_H7; 217 sctx->count = 0; 218 219 return 0; 220 } 221 222 int sha256_update(struct sha256_state *sctx, const u8 *data, unsigned int len) 223 { 224 unsigned int partial, done; 225 const u8 *src; 226 227 partial = sctx->count & 0x3f; 228 sctx->count += len; 229 done = 0; 230 src = data; 231 232 if ((partial + len) > 63) { 233 if (partial) { 234 done = -partial; 235 memcpy(sctx->buf + partial, data, done + 64); 236 src = sctx->buf; 237 } 238 239 do { 240 sha256_transform(sctx->state, src); 241 done += 64; 242 src = data + done; 243 } while (done + 63 < len); 244 245 partial = 0; 246 } 247 memcpy(sctx->buf + partial, src, len - done); 248 249 return 0; 250 } 251 252 int sha256_final(struct sha256_state *sctx, u8 *out) 253 { 254 __be32 *dst = (__be32 *)out; 255 __be64 bits; 256 unsigned int index, pad_len; 257 int i; 258 static const u8 padding[64] = { 0x80, }; 259 260 /* Save number of bits */ 261 bits = cpu_to_be64(sctx->count << 3); 262 263 /* Pad out to 56 mod 64. */ 264 index = sctx->count & 0x3f; 265 pad_len = (index < 56) ? (56 - index) : ((64+56) - index); 266 sha256_update(sctx, padding, pad_len); 267 268 /* Append length (before padding) */ 269 sha256_update(sctx, (const u8 *)&bits, sizeof(bits)); 270 271 /* Store state in digest */ 272 for (i = 0; i < 8; i++) 273 dst[i] = cpu_to_be32(sctx->state[i]); 274 275 /* Zeroize sensitive information. */ 276 memset(sctx, 0, sizeof(*sctx)); 277 278 return 0; 279 } 280