lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* Functions to compute SHA512 message digest of files or memory blocks. |
| 2 | according to the definition of SHA512 in FIPS 180-2. |
| 3 | Copyright (C) 2007-2015 Free Software Foundation, Inc. |
| 4 | This file is part of the GNU C Library. |
| 5 | |
| 6 | The GNU C Library is free software; you can redistribute it and/or |
| 7 | modify it under the terms of the GNU Lesser General Public |
| 8 | License as published by the Free Software Foundation; either |
| 9 | version 2.1 of the License, or (at your option) any later version. |
| 10 | |
| 11 | The GNU C Library is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | Lesser General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU Lesser General Public |
| 17 | License along with the GNU C Library; if not, see |
| 18 | <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | /* Written by Ulrich Drepper <drepper@redhat.com>, 2007. */ |
| 21 | |
| 22 | #ifdef HAVE_CONFIG_H |
| 23 | # include <config.h> |
| 24 | #endif |
| 25 | |
| 26 | #include <endian.h> |
| 27 | #include <stdlib.h> |
| 28 | #include <string.h> |
| 29 | #include <stdint.h> |
| 30 | #include <sys/types.h> |
| 31 | |
| 32 | #include "sha512.h" |
| 33 | |
| 34 | #if __BYTE_ORDER == __LITTLE_ENDIAN |
| 35 | # ifdef _LIBC |
| 36 | # include <byteswap.h> |
| 37 | # define SWAP(n) bswap_64 (n) |
| 38 | # else |
| 39 | # define SWAP(n) \ |
| 40 | (((n) << 56) \ |
| 41 | | (((n) & 0xff00) << 40) \ |
| 42 | | (((n) & 0xff0000) << 24) \ |
| 43 | | (((n) & 0xff000000) << 8) \ |
| 44 | | (((n) >> 8) & 0xff000000) \ |
| 45 | | (((n) >> 24) & 0xff0000) \ |
| 46 | | (((n) >> 40) & 0xff00) \ |
| 47 | | ((n) >> 56)) |
| 48 | # endif |
| 49 | #else |
| 50 | # define SWAP(n) (n) |
| 51 | #endif |
| 52 | |
| 53 | |
| 54 | /* This array contains the bytes used to pad the buffer to the next |
| 55 | 64-byte boundary. (FIPS 180-2:5.1.2) */ |
| 56 | static const unsigned char fillbuf[128] = { 0x80, 0 /* , 0, 0, ... */ }; |
| 57 | |
| 58 | |
| 59 | /* Constants for SHA512 from FIPS 180-2:4.2.3. */ |
| 60 | static const uint64_t K[80] = |
| 61 | { |
| 62 | UINT64_C (0x428a2f98d728ae22), UINT64_C (0x7137449123ef65cd), |
| 63 | UINT64_C (0xb5c0fbcfec4d3b2f), UINT64_C (0xe9b5dba58189dbbc), |
| 64 | UINT64_C (0x3956c25bf348b538), UINT64_C (0x59f111f1b605d019), |
| 65 | UINT64_C (0x923f82a4af194f9b), UINT64_C (0xab1c5ed5da6d8118), |
| 66 | UINT64_C (0xd807aa98a3030242), UINT64_C (0x12835b0145706fbe), |
| 67 | UINT64_C (0x243185be4ee4b28c), UINT64_C (0x550c7dc3d5ffb4e2), |
| 68 | UINT64_C (0x72be5d74f27b896f), UINT64_C (0x80deb1fe3b1696b1), |
| 69 | UINT64_C (0x9bdc06a725c71235), UINT64_C (0xc19bf174cf692694), |
| 70 | UINT64_C (0xe49b69c19ef14ad2), UINT64_C (0xefbe4786384f25e3), |
| 71 | UINT64_C (0x0fc19dc68b8cd5b5), UINT64_C (0x240ca1cc77ac9c65), |
| 72 | UINT64_C (0x2de92c6f592b0275), UINT64_C (0x4a7484aa6ea6e483), |
| 73 | UINT64_C (0x5cb0a9dcbd41fbd4), UINT64_C (0x76f988da831153b5), |
| 74 | UINT64_C (0x983e5152ee66dfab), UINT64_C (0xa831c66d2db43210), |
| 75 | UINT64_C (0xb00327c898fb213f), UINT64_C (0xbf597fc7beef0ee4), |
| 76 | UINT64_C (0xc6e00bf33da88fc2), UINT64_C (0xd5a79147930aa725), |
| 77 | UINT64_C (0x06ca6351e003826f), UINT64_C (0x142929670a0e6e70), |
| 78 | UINT64_C (0x27b70a8546d22ffc), UINT64_C (0x2e1b21385c26c926), |
| 79 | UINT64_C (0x4d2c6dfc5ac42aed), UINT64_C (0x53380d139d95b3df), |
| 80 | UINT64_C (0x650a73548baf63de), UINT64_C (0x766a0abb3c77b2a8), |
| 81 | UINT64_C (0x81c2c92e47edaee6), UINT64_C (0x92722c851482353b), |
| 82 | UINT64_C (0xa2bfe8a14cf10364), UINT64_C (0xa81a664bbc423001), |
| 83 | UINT64_C (0xc24b8b70d0f89791), UINT64_C (0xc76c51a30654be30), |
| 84 | UINT64_C (0xd192e819d6ef5218), UINT64_C (0xd69906245565a910), |
| 85 | UINT64_C (0xf40e35855771202a), UINT64_C (0x106aa07032bbd1b8), |
| 86 | UINT64_C (0x19a4c116b8d2d0c8), UINT64_C (0x1e376c085141ab53), |
| 87 | UINT64_C (0x2748774cdf8eeb99), UINT64_C (0x34b0bcb5e19b48a8), |
| 88 | UINT64_C (0x391c0cb3c5c95a63), UINT64_C (0x4ed8aa4ae3418acb), |
| 89 | UINT64_C (0x5b9cca4f7763e373), UINT64_C (0x682e6ff3d6b2b8a3), |
| 90 | UINT64_C (0x748f82ee5defb2fc), UINT64_C (0x78a5636f43172f60), |
| 91 | UINT64_C (0x84c87814a1f0ab72), UINT64_C (0x8cc702081a6439ec), |
| 92 | UINT64_C (0x90befffa23631e28), UINT64_C (0xa4506cebde82bde9), |
| 93 | UINT64_C (0xbef9a3f7b2c67915), UINT64_C (0xc67178f2e372532b), |
| 94 | UINT64_C (0xca273eceea26619c), UINT64_C (0xd186b8c721c0c207), |
| 95 | UINT64_C (0xeada7dd6cde0eb1e), UINT64_C (0xf57d4f7fee6ed178), |
| 96 | UINT64_C (0x06f067aa72176fba), UINT64_C (0x0a637dc5a2c898a6), |
| 97 | UINT64_C (0x113f9804bef90dae), UINT64_C (0x1b710b35131c471b), |
| 98 | UINT64_C (0x28db77f523047d84), UINT64_C (0x32caab7b40c72493), |
| 99 | UINT64_C (0x3c9ebe0a15c9bebc), UINT64_C (0x431d67c49c100d4c), |
| 100 | UINT64_C (0x4cc5d4becb3e42b6), UINT64_C (0x597f299cfc657e2a), |
| 101 | UINT64_C (0x5fcb6fab3ad6faec), UINT64_C (0x6c44198c4a475817) |
| 102 | }; |
| 103 | |
| 104 | void |
| 105 | sha512_process_block (const void *buffer, size_t len, struct sha512_ctx *ctx); |
| 106 | |
| 107 | /* Initialize structure containing state of computation. |
| 108 | (FIPS 180-2:5.3.3) */ |
| 109 | void |
| 110 | __sha512_init_ctx (ctx) |
| 111 | struct sha512_ctx *ctx; |
| 112 | { |
| 113 | ctx->H[0] = UINT64_C (0x6a09e667f3bcc908); |
| 114 | ctx->H[1] = UINT64_C (0xbb67ae8584caa73b); |
| 115 | ctx->H[2] = UINT64_C (0x3c6ef372fe94f82b); |
| 116 | ctx->H[3] = UINT64_C (0xa54ff53a5f1d36f1); |
| 117 | ctx->H[4] = UINT64_C (0x510e527fade682d1); |
| 118 | ctx->H[5] = UINT64_C (0x9b05688c2b3e6c1f); |
| 119 | ctx->H[6] = UINT64_C (0x1f83d9abfb41bd6b); |
| 120 | ctx->H[7] = UINT64_C (0x5be0cd19137e2179); |
| 121 | |
| 122 | ctx->total[0] = ctx->total[1] = 0; |
| 123 | ctx->buflen = 0; |
| 124 | } |
| 125 | |
| 126 | |
| 127 | /* Process the remaining bytes in the internal buffer and the usual |
| 128 | prolog according to the standard and write the result to RESBUF. |
| 129 | |
| 130 | IMPORTANT: On some systems it is required that RESBUF is correctly |
| 131 | aligned for a 32 bits value. */ |
| 132 | void * |
| 133 | __sha512_finish_ctx (ctx, resbuf) |
| 134 | struct sha512_ctx *ctx; |
| 135 | void *resbuf; |
| 136 | { |
| 137 | /* Take yet unprocessed bytes into account. */ |
| 138 | uint64_t bytes = ctx->buflen; |
| 139 | size_t pad; |
| 140 | |
| 141 | /* Now count remaining bytes. */ |
| 142 | #ifdef USE_TOTAL128 |
| 143 | ctx->total128 += bytes; |
| 144 | #else |
| 145 | ctx->total[TOTAL128_low] += bytes; |
| 146 | if (ctx->total[TOTAL128_low] < bytes) |
| 147 | ++ctx->total[TOTAL128_high]; |
| 148 | #endif |
| 149 | |
| 150 | pad = bytes >= 112 ? 128 + 112 - bytes : 112 - bytes; |
| 151 | memcpy (&ctx->buffer[bytes], fillbuf, pad); |
| 152 | |
| 153 | /* Put the 128-bit file length in *bits* at the end of the buffer. */ |
| 154 | ctx->buffer64[(bytes + pad + 8) / 8] = SWAP (ctx->total[TOTAL128_low] << 3); |
| 155 | ctx->buffer64[(bytes + pad) / 8] = SWAP ((ctx->total[TOTAL128_high] << 3) | |
| 156 | (ctx->total[TOTAL128_low] >> 61)); |
| 157 | |
| 158 | /* Process last bytes. */ |
| 159 | sha512_process_block (ctx->buffer, bytes + pad + 16, ctx); |
| 160 | |
| 161 | /* Put result from CTX in first 64 bytes following RESBUF. */ |
| 162 | for (unsigned int i = 0; i < 8; ++i) |
| 163 | ((uint64_t *) resbuf)[i] = SWAP (ctx->H[i]); |
| 164 | |
| 165 | return resbuf; |
| 166 | } |
| 167 | |
| 168 | |
| 169 | void |
| 170 | __sha512_process_bytes (buffer, len, ctx) |
| 171 | const void *buffer; |
| 172 | size_t len; |
| 173 | struct sha512_ctx *ctx; |
| 174 | { |
| 175 | /* When we already have some bits in our internal buffer concatenate |
| 176 | both inputs first. */ |
| 177 | if (ctx->buflen != 0) |
| 178 | { |
| 179 | size_t left_over = ctx->buflen; |
| 180 | size_t add = 256 - left_over > len ? len : 256 - left_over; |
| 181 | |
| 182 | memcpy (&ctx->buffer[left_over], buffer, add); |
| 183 | ctx->buflen += add; |
| 184 | |
| 185 | if (ctx->buflen > 128) |
| 186 | { |
| 187 | sha512_process_block (ctx->buffer, ctx->buflen & ~127, ctx); |
| 188 | |
| 189 | ctx->buflen &= 127; |
| 190 | /* The regions in the following copy operation cannot overlap. */ |
| 191 | memcpy (ctx->buffer, &ctx->buffer[(left_over + add) & ~127], |
| 192 | ctx->buflen); |
| 193 | } |
| 194 | |
| 195 | buffer = (const char *) buffer + add; |
| 196 | len -= add; |
| 197 | } |
| 198 | |
| 199 | /* Process available complete blocks. */ |
| 200 | if (len >= 128) |
| 201 | { |
| 202 | #if !_STRING_ARCH_unaligned |
| 203 | /* To check alignment gcc has an appropriate operator. Other |
| 204 | compilers don't. */ |
| 205 | # if __GNUC__ >= 2 |
| 206 | # define UNALIGNED_P(p) (((uintptr_t) p) % __alignof__ (uint64_t) != 0) |
| 207 | # else |
| 208 | # define UNALIGNED_P(p) (((uintptr_t) p) % sizeof (uint64_t) != 0) |
| 209 | # endif |
| 210 | if (UNALIGNED_P (buffer)) |
| 211 | while (len > 128) |
| 212 | { |
| 213 | sha512_process_block (memcpy (ctx->buffer, buffer, 128), 128, |
| 214 | ctx); |
| 215 | buffer = (const char *) buffer + 128; |
| 216 | len -= 128; |
| 217 | } |
| 218 | else |
| 219 | #endif |
| 220 | { |
| 221 | sha512_process_block (buffer, len & ~127, ctx); |
| 222 | buffer = (const char *) buffer + (len & ~127); |
| 223 | len &= 127; |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | /* Move remaining bytes into internal buffer. */ |
| 228 | if (len > 0) |
| 229 | { |
| 230 | size_t left_over = ctx->buflen; |
| 231 | |
| 232 | memcpy (&ctx->buffer[left_over], buffer, len); |
| 233 | left_over += len; |
| 234 | if (left_over >= 128) |
| 235 | { |
| 236 | sha512_process_block (ctx->buffer, 128, ctx); |
| 237 | left_over -= 128; |
| 238 | memcpy (ctx->buffer, &ctx->buffer[128], left_over); |
| 239 | } |
| 240 | ctx->buflen = left_over; |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | #include <sha512-block.c> |