4 * Parts of this file are based on public domain code written by Steve Reid.
8 * Copyright (C) 2012, 2013 Eric Biggers
10 * This file is part of wimlib, a library for working with WIM files.
12 * wimlib is free software; you can redistribute it and/or modify it under the
13 * terms of the GNU General Public License as published by the Free
14 * Software Foundation; either version 3 of the License, or (at your option)
17 * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
18 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
19 * A PARTICULAR PURPOSE. See the GNU General Public License for more
22 * You should have received a copy of the GNU General Public License
23 * along with wimlib; if not, see http://www.gnu.org/licenses/.
29 #include "endianness.h"
32 /* The SHA1 support in wimlib can use an external libcrypto (part of openssl) or
33 * use a built-in SHA1 function. The built-in functions are either based on
34 * Steve Reid's public domain code, or based on Intel's SSSE3 SHA1 code.
37 const u8 zero_hash[SHA1_HASH_SIZE] = {
45 #ifndef WITH_LIBCRYPTO
47 /* Initialize new context */
49 sha1_init(SHA_CTX* context)
51 /* SHA1 initialization constants */
52 context->state[0] = 0x67452301;
53 context->state[1] = 0xEFCDAB89;
54 context->state[2] = 0x98BADCFE;
55 context->state[3] = 0x10325476;
56 context->state[4] = 0xC3D2E1F0;
57 context->count[0] = context->count[1] = 0;
60 #ifdef ENABLE_SSSE3_SHA1
62 sha1_update_intel(int *hash, const void* input, size_t num_blocks);
65 sha1_update(SHA_CTX *context, const void *data, size_t len)
67 sha1_update_intel((int*)&context->state, data, len / 64);
68 size_t j = (context->count[0] >> 3) & 63;
69 if ((context->count[0] += len << 3) < (len << 3)) context->count[1]++;
70 context->count[1] += (len >> 29);
77 "Cannot calculate SHA1 message digest: CPU does not support SSSE3\n"
78 "instructions! Recompile wimlib without the --enable-ssse3-sha1 flag\n"
79 "to use wimlib on this CPU.\n");
82 #else /* ENABLE_SSSE3_SHA1 */
84 #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
86 /* blk0() and blk() perform the initial expand. */
87 /* I got the idea of expanding during the round function from SSLeay */
88 /* FIXME: can we do this in an endian-proof way? */
89 #ifdef WORDS_BIGENDIAN
90 #define blk0(i) block->l[i]
92 #define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \
93 |(rol(block->l[i],8)&0x00FF00FF))
95 #define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
96 ^block->l[(i+2)&15]^block->l[i&15],1))
98 /* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
99 #define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
100 #define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
101 #define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
102 #define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
103 #define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
105 /* Hash a single 512-bit block. This is the core of the algorithm. */
107 sha1_transform(u32 state[5], const u8 buffer[64])
117 block = (CHAR64LONG16*)workspace;
118 memcpy(block, buffer, 64);
120 /* Copy context->state[] to working vars */
127 /* 4 rounds of 20 operations each. Loop unrolled. */
128 R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3);
129 R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7);
130 R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11);
131 R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15);
132 R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19);
133 R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23);
134 R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27);
135 R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31);
136 R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35);
137 R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39);
138 R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43);
139 R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47);
140 R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51);
141 R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55);
142 R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59);
143 R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63);
144 R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67);
145 R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71);
146 R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75);
147 R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79);
149 /* Add the working vars back into context.state[] */
158 sha1_update(SHA_CTX* context, const void *data, const size_t len)
162 j = (context->count[0] >> 3) & 63;
163 if ((context->count[0] += len << 3) < (len << 3))
165 context->count[1] += (len >> 29);
166 if ((j + len) > 63) {
168 memcpy(&context->buffer[j], data, i);
169 sha1_transform(context->state, context->buffer);
170 for ( ; i + 63 < len; i += 64)
171 sha1_transform(context->state, data + i);
176 memcpy(&context->buffer[j], data + i, len - i);
179 #endif /* !ENABLE_SSSE3_SHA1 */
181 /* Add padding and return the message digest. */
183 sha1_final(u8 md[SHA1_HASH_SIZE], SHA_CTX* context)
188 for (i = 0; i < 8; i++) {
189 finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]
190 >> ((3-(i & 3)) * 8) ) & 255); /* Endian independent */
192 sha1_update(context, (u8 *)"\200", 1);
193 while ((context->count[0] & 504) != 448) {
194 sha1_update(context, (u8 *)"\0", 1);
196 sha1_update(context, finalcount, 8); /* Should cause a sha1_transform() */
197 for (i = 0; i < SHA1_HASH_SIZE; i++) {
198 md[i] = (u8)((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
203 sha1_buffer(const void *buffer, size_t len, u8 md[SHA1_HASH_SIZE])
207 sha1_update(&ctx, buffer, len);
208 sha1_final(md, &ctx);
211 #endif /* !WITH_LIBCRYPTO */
214 sha1_stream(FILE *fp, u8 md[SHA1_HASH_SIZE])
216 char buf[BUFFER_SIZE];
221 bytes_read = fread(buf, 1, sizeof(buf), fp);
222 sha1_update(&ctx, buf, bytes_read);
223 if (bytes_read < sizeof(buf)) {
225 return WIMLIB_ERR_READ;
229 sha1_final(md, &ctx);
234 /* Calculates the SHA1 message digest of a file. @md must point to a buffer of
235 * length 20 bytes into which the message digest is written. */
237 sha1sum(const tchar *filename, u8 md[SHA1_HASH_SIZE])
242 fp = tfopen(filename, T("rb"));
244 ERROR_WITH_ERRNO("Cannot open the file `%"TS"' for reading",
246 return WIMLIB_ERR_OPEN;
248 ret = sha1_stream(fp, md);
250 ERROR_WITH_ERRNO("Error calculating SHA1 message digest of "
251 "`%"TS"'", filename);