]>
Commit | Line | Data |
---|---|---|
c3266dc0 UD |
1 | /* Functions to compute SHA256 message digest of files or memory blocks. |
2 | according to the definition of SHA256 in FIPS 180-2. | |
688903eb | 3 | Copyright (C) 2007-2018 Free Software Foundation, Inc. |
c3266dc0 UD |
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 | |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
c3266dc0 UD |
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> | |
e054f494 | 29 | #include <stdint.h> |
c3266dc0 UD |
30 | #include <sys/types.h> |
31 | ||
32 | #include "sha256.h" | |
33 | ||
34 | #if __BYTE_ORDER == __LITTLE_ENDIAN | |
35 | # ifdef _LIBC | |
36 | # include <byteswap.h> | |
37 | # define SWAP(n) bswap_32 (n) | |
fcfc776b | 38 | # define SWAP64(n) bswap_64 (n) |
c3266dc0 UD |
39 | # else |
40 | # define SWAP(n) \ | |
41 | (((n) << 24) | (((n) & 0xff00) << 8) | (((n) >> 8) & 0xff00) | ((n) >> 24)) | |
fcfc776b UD |
42 | # define SWAP64(n) \ |
43 | (((n) << 56) \ | |
44 | | (((n) & 0xff00) << 40) \ | |
45 | | (((n) & 0xff0000) << 24) \ | |
46 | | (((n) & 0xff000000) << 8) \ | |
47 | | (((n) >> 8) & 0xff000000) \ | |
48 | | (((n) >> 24) & 0xff0000) \ | |
49 | | (((n) >> 40) & 0xff00) \ | |
50 | | ((n) >> 56)) | |
c3266dc0 UD |
51 | # endif |
52 | #else | |
53 | # define SWAP(n) (n) | |
fcfc776b | 54 | # define SWAP64(n) (n) |
c3266dc0 UD |
55 | #endif |
56 | ||
57 | ||
58 | /* This array contains the bytes used to pad the buffer to the next | |
59 | 64-byte boundary. (FIPS 180-2:5.1.1) */ | |
60 | static const unsigned char fillbuf[64] = { 0x80, 0 /* , 0, 0, ... */ }; | |
61 | ||
62 | ||
63 | /* Constants for SHA256 from FIPS 180-2:4.2.2. */ | |
64 | static const uint32_t K[64] = | |
65 | { | |
66 | 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, | |
67 | 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, | |
68 | 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, | |
69 | 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, | |
70 | 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, | |
71 | 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, | |
72 | 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, | |
73 | 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, | |
74 | 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, | |
75 | 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, | |
76 | 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, | |
77 | 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, | |
78 | 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, | |
79 | 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, | |
80 | 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, | |
81 | 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 | |
82 | }; | |
83 | ||
09472915 | 84 | void __sha256_process_block (const void *, size_t, struct sha256_ctx *); |
c3266dc0 UD |
85 | |
86 | /* Initialize structure containing state of computation. | |
87 | (FIPS 180-2:5.3.2) */ | |
88 | void | |
9d46370c | 89 | __sha256_init_ctx (struct sha256_ctx *ctx) |
c3266dc0 UD |
90 | { |
91 | ctx->H[0] = 0x6a09e667; | |
92 | ctx->H[1] = 0xbb67ae85; | |
93 | ctx->H[2] = 0x3c6ef372; | |
94 | ctx->H[3] = 0xa54ff53a; | |
95 | ctx->H[4] = 0x510e527f; | |
96 | ctx->H[5] = 0x9b05688c; | |
97 | ctx->H[6] = 0x1f83d9ab; | |
98 | ctx->H[7] = 0x5be0cd19; | |
99 | ||
fcfc776b | 100 | ctx->total64 = 0; |
c3266dc0 UD |
101 | ctx->buflen = 0; |
102 | } | |
103 | ||
104 | ||
105 | /* Process the remaining bytes in the internal buffer and the usual | |
106 | prolog according to the standard and write the result to RESBUF. | |
107 | ||
108 | IMPORTANT: On some systems it is required that RESBUF is correctly | |
109 | aligned for a 32 bits value. */ | |
110 | void * | |
9d46370c | 111 | __sha256_finish_ctx (struct sha256_ctx *ctx, void *resbuf) |
c3266dc0 UD |
112 | { |
113 | /* Take yet unprocessed bytes into account. */ | |
114 | uint32_t bytes = ctx->buflen; | |
115 | size_t pad; | |
116 | ||
117 | /* Now count remaining bytes. */ | |
fcfc776b | 118 | ctx->total64 += bytes; |
c3266dc0 UD |
119 | |
120 | pad = bytes >= 56 ? 64 + 56 - bytes : 56 - bytes; | |
121 | memcpy (&ctx->buffer[bytes], fillbuf, pad); | |
122 | ||
123 | /* Put the 64-bit file length in *bits* at the end of the buffer. */ | |
27822ce6 | 124 | #if _STRING_ARCH_unaligned |
7dc6bd90 | 125 | ctx->buffer64[(bytes + pad) / 8] = SWAP64 (ctx->total64 << 3); |
fcfc776b | 126 | #else |
7dc6bd90 UD |
127 | ctx->buffer32[(bytes + pad + 4) / 4] = SWAP (ctx->total[TOTAL64_low] << 3); |
128 | ctx->buffer32[(bytes + pad) / 4] = SWAP ((ctx->total[TOTAL64_high] << 3) | | |
129 | (ctx->total[TOTAL64_low] >> 29)); | |
fcfc776b | 130 | #endif |
c3266dc0 UD |
131 | |
132 | /* Process last bytes. */ | |
09472915 | 133 | __sha256_process_block (ctx->buffer, bytes + pad + 8, ctx); |
c3266dc0 UD |
134 | |
135 | /* Put result from CTX in first 32 bytes following RESBUF. */ | |
136 | for (unsigned int i = 0; i < 8; ++i) | |
137 | ((uint32_t *) resbuf)[i] = SWAP (ctx->H[i]); | |
138 | ||
139 | return resbuf; | |
140 | } | |
141 | ||
142 | ||
143 | void | |
9d46370c | 144 | __sha256_process_bytes (const void *buffer, size_t len, struct sha256_ctx *ctx) |
c3266dc0 UD |
145 | { |
146 | /* When we already have some bits in our internal buffer concatenate | |
147 | both inputs first. */ | |
148 | if (ctx->buflen != 0) | |
149 | { | |
150 | size_t left_over = ctx->buflen; | |
151 | size_t add = 128 - left_over > len ? len : 128 - left_over; | |
152 | ||
153 | memcpy (&ctx->buffer[left_over], buffer, add); | |
154 | ctx->buflen += add; | |
155 | ||
156 | if (ctx->buflen > 64) | |
157 | { | |
09472915 | 158 | __sha256_process_block (ctx->buffer, ctx->buflen & ~63, ctx); |
c3266dc0 UD |
159 | |
160 | ctx->buflen &= 63; | |
161 | /* The regions in the following copy operation cannot overlap. */ | |
162 | memcpy (ctx->buffer, &ctx->buffer[(left_over + add) & ~63], | |
163 | ctx->buflen); | |
164 | } | |
165 | ||
166 | buffer = (const char *) buffer + add; | |
167 | len -= add; | |
168 | } | |
169 | ||
170 | /* Process available complete blocks. */ | |
171 | if (len >= 64) | |
172 | { | |
173 | #if !_STRING_ARCH_unaligned | |
174 | /* To check alignment gcc has an appropriate operator. Other | |
175 | compilers don't. */ | |
176 | # if __GNUC__ >= 2 | |
177 | # define UNALIGNED_P(p) (((uintptr_t) p) % __alignof__ (uint32_t) != 0) | |
178 | # else | |
179 | # define UNALIGNED_P(p) (((uintptr_t) p) % sizeof (uint32_t) != 0) | |
180 | # endif | |
181 | if (UNALIGNED_P (buffer)) | |
182 | while (len > 64) | |
183 | { | |
09472915 | 184 | __sha256_process_block (memcpy (ctx->buffer, buffer, 64), 64, ctx); |
c3266dc0 UD |
185 | buffer = (const char *) buffer + 64; |
186 | len -= 64; | |
187 | } | |
188 | else | |
189 | #endif | |
190 | { | |
09472915 | 191 | __sha256_process_block (buffer, len & ~63, ctx); |
c3266dc0 UD |
192 | buffer = (const char *) buffer + (len & ~63); |
193 | len &= 63; | |
194 | } | |
195 | } | |
196 | ||
197 | /* Move remaining bytes into internal buffer. */ | |
198 | if (len > 0) | |
199 | { | |
200 | size_t left_over = ctx->buflen; | |
201 | ||
202 | memcpy (&ctx->buffer[left_over], buffer, len); | |
203 | left_over += len; | |
204 | if (left_over >= 64) | |
205 | { | |
09472915 | 206 | __sha256_process_block (ctx->buffer, 64, ctx); |
c3266dc0 UD |
207 | left_over -= 64; |
208 | memcpy (ctx->buffer, &ctx->buffer[64], left_over); | |
209 | } | |
210 | ctx->buflen = left_over; | |
211 | } | |
212 | } | |
3a0d900a DM |
213 | |
214 | #include <sha256-block.c> |