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henrike@webrtc.orgf0488722014-05-13 18:00:26 +00001/*
2 * SHA-1 in C
3 * By Steve Reid <sreid@sea-to-sky.net>
4 * 100% Public Domain
5 *
6 * -----------------
7 * Modified 7/98
8 * By James H. Brown <jbrown@burgoyne.com>
9 * Still 100% Public Domain
10 *
11 * Corrected a problem which generated improper hash values on 16 bit machines
12 * Routine SHA1Update changed from
13 * void SHA1Update(SHA1_CTX* context, unsigned char* data, unsigned int
14 * len)
15 * to
16 * void SHA1Update(SHA1_CTX* context, unsigned char* data, unsigned
17 * long len)
18 *
19 * The 'len' parameter was declared an int which works fine on 32 bit machines.
20 * However, on 16 bit machines an int is too small for the shifts being done
21 * against
22 * it. This caused the hash function to generate incorrect values if len was
23 * greater than 8191 (8K - 1) due to the 'len << 3' on line 3 of SHA1Update().
24 *
25 * Since the file IO in main() reads 16K at a time, any file 8K or larger would
26 * be guaranteed to generate the wrong hash (e.g. Test Vector #3, a million
27 * "a"s).
28 *
29 * I also changed the declaration of variables i & j in SHA1Update to
30 * unsigned long from unsigned int for the same reason.
31 *
32 * These changes should make no difference to any 32 bit implementations since
33 * an
34 * int and a long are the same size in those environments.
35 *
36 * --
37 * I also corrected a few compiler warnings generated by Borland C.
38 * 1. Added #include <process.h> for exit() prototype
39 * 2. Removed unused variable 'j' in SHA1Final
40 * 3. Changed exit(0) to return(0) at end of main.
41 *
42 * ALL changes I made can be located by searching for comments containing 'JHB'
43 * -----------------
44 * Modified 8/98
45 * By Steve Reid <sreid@sea-to-sky.net>
46 * Still 100% public domain
47 *
48 * 1- Removed #include <process.h> and used return() instead of exit()
49 * 2- Fixed overwriting of finalcount in SHA1Final() (discovered by Chris Hall)
50 * 3- Changed email address from steve@edmweb.com to sreid@sea-to-sky.net
51 *
52 * -----------------
53 * Modified 4/01
54 * By Saul Kravitz <Saul.Kravitz@celera.com>
55 * Still 100% PD
56 * Modified to run on Compaq Alpha hardware.
57 *
58 * -----------------
59 * Modified 07/2002
60 * By Ralph Giles <giles@ghostscript.com>
61 * Still 100% public domain
62 * modified for use with stdint types, autoconf
63 * code cleanup, removed attribution comments
64 * switched SHA1Final() argument order for consistency
65 * use SHA1_ prefix for public api
66 * move public api to sha1.h
67 *
68 * -----------------
69 * Modified 02/2012
70 * By Justin Uberti <juberti@google.com>
71 * Remove underscore from SHA1 prefix to avoid conflict with OpenSSL
72 * Remove test code
73 * Untabify
74 *
75 * -----------------
76 * Modified 03/2012
77 * By Ronghua Wu <ronghuawu@google.com>
78 * Change the typedef of uint32(8)_t to uint32(8). We need this because in the
79 * chromium android build, the stdio.h will include stdint.h which already
80 * defined uint32(8)_t.
81 *
82 * -----------------
83 * Modified 04/2012
84 * By Frank Barchard <fbarchard@google.com>
85 * Ported to C++, Google style, change len to size_t, enable SHA1HANDSOFF
86 *
87 * Test Vectors (from FIPS PUB 180-1)
88 * "abc"
89 * A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
90 * "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
91 * 84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
92 * A million repetitions of "a"
93 * 34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
Sergey Ulanov8eb76ff2015-05-20 11:25:37 -070094 *
95 * -----------------
96 * Modified 05/2015
97 * By Sergey Ulanov <sergeyu@chromium.org>
98 * Removed static buffer to make computation thread-safe.
Peter Boström0c4e06b2015-10-07 12:23:21 +020099 *
100 * -----------------
101 * Modified 10/2015
102 * By Peter Boström <pbos@webrtc.org>
103 * Change uint32(8) back to uint32(8)_t (undoes (03/2012) change).
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000104 */
105
106// Enabling SHA1HANDSOFF preserves the caller's data buffer.
107// Disabling SHA1HANDSOFF the buffer will be modified (end swapped).
108#define SHA1HANDSOFF
109
Mirko Bonadei92ea95e2017-09-15 06:47:31 +0200110#include "rtc_base/sha1.h"
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000111
112#include <stdio.h>
113#include <string.h>
114
henrike@webrtc.orgc50bf7c2014-05-14 18:24:13 +0000115namespace rtc {
116
Thiago Farina9504b892015-04-09 15:47:57 +0200117namespace {
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000118
119#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
120
121// blk0() and blk() perform the initial expand.
122// I got the idea of expanding during the round function from SSLeay
123// FIXME: can we do this in an endian-proof way?
henrikg71df77b2015-09-18 01:48:34 -0700124#ifdef RTC_ARCH_CPU_BIG_ENDIAN
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000125#define blk0(i) block->l[i]
126#else
127#define blk0(i) (block->l[i] = (rol(block->l[i], 24) & 0xFF00FF00) | \
128 (rol(block->l[i], 8) & 0x00FF00FF))
129#endif
130#define blk(i) (block->l[i & 15] = rol(block->l[(i + 13) & 15] ^ \
131 block->l[(i + 8) & 15] ^ block->l[(i + 2) & 15] ^ block->l[i & 15], 1))
132
133// (R0+R1), R2, R3, R4 are the different operations used in SHA1.
134#define R0(v, w, x, y, z, i) \
135 z += ((w & (x ^ y)) ^ y) + blk0(i) + 0x5A827999 + rol(v, 5); \
136 w = rol(w, 30);
137#define R1(v, w, x, y, z, i) \
138 z += ((w & (x ^ y)) ^ y) + blk(i) + 0x5A827999 + rol(v, 5); \
139 w = rol(w, 30);
140#define R2(v, w, x, y, z, i) \
141 z += (w ^ x ^ y) + blk(i) + 0x6ED9EBA1 + rol(v, 5);\
142 w = rol(w, 30);
143#define R3(v, w, x, y, z, i) \
144 z += (((w | x) & y) | (w & x)) + blk(i) + 0x8F1BBCDC + rol(v, 5); \
145 w = rol(w, 30);
146#define R4(v, w, x, y, z, i) \
147 z += (w ^ x ^ y) + blk(i) + 0xCA62C1D6 + rol(v, 5); \
148 w = rol(w, 30);
149
150#ifdef VERBOSE // SAK
151void SHAPrintContext(SHA1_CTX *context, char *msg) {
152 printf("%s (%d,%d) %x %x %x %x %x\n",
153 msg,
154 context->count[0], context->count[1],
155 context->state[0],
156 context->state[1],
157 context->state[2],
158 context->state[3],
159 context->state[4]);
160}
161#endif /* VERBOSE */
162
163// Hash a single 512-bit block. This is the core of the algorithm.
Peter Boström0c4e06b2015-10-07 12:23:21 +0200164void SHA1Transform(uint32_t state[5], const uint8_t buffer[64]) {
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000165 union CHAR64LONG16 {
Peter Boström0c4e06b2015-10-07 12:23:21 +0200166 uint8_t c[64];
167 uint32_t l[16];
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000168 };
169#ifdef SHA1HANDSOFF
Peter Boström0c4e06b2015-10-07 12:23:21 +0200170 uint8_t workspace[64];
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000171 memcpy(workspace, buffer, 64);
172 CHAR64LONG16* block = reinterpret_cast<CHAR64LONG16*>(workspace);
173#else
174 // Note(fbarchard): This option does modify the user's data buffer.
175 CHAR64LONG16* block = const_cast<CHAR64LONG16*>(
176 reinterpret_cast<const CHAR64LONG16*>(buffer));
177#endif
178
179 // Copy context->state[] to working vars.
Peter Boström0c4e06b2015-10-07 12:23:21 +0200180 uint32_t a = state[0];
181 uint32_t b = state[1];
182 uint32_t c = state[2];
183 uint32_t d = state[3];
184 uint32_t e = state[4];
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000185
186 // 4 rounds of 20 operations each. Loop unrolled.
187 // Note(fbarchard): The following has lint warnings for multiple ; on
188 // a line and no space after , but is left as-is to be similar to the
189 // original code.
190 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);
191 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);
192 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);
193 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);
194 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);
195 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);
196 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);
197 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);
198 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);
199 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);
200 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);
201 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);
202 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);
203 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);
204 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);
205 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);
206 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);
207 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);
208 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);
209 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);
210
211 // Add the working vars back into context.state[].
212 state[0] += a;
213 state[1] += b;
214 state[2] += c;
215 state[3] += d;
216 state[4] += e;
217}
218
Thiago Farina9504b892015-04-09 15:47:57 +0200219} // namespace
220
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000221// SHA1Init - Initialize new context.
222void SHA1Init(SHA1_CTX* context) {
223 // SHA1 initialization constants.
224 context->state[0] = 0x67452301;
225 context->state[1] = 0xEFCDAB89;
226 context->state[2] = 0x98BADCFE;
227 context->state[3] = 0x10325476;
228 context->state[4] = 0xC3D2E1F0;
229 context->count[0] = context->count[1] = 0;
230}
231
232// Run your data through this.
Peter Boström0c4e06b2015-10-07 12:23:21 +0200233void SHA1Update(SHA1_CTX* context, const uint8_t* data, size_t input_len) {
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000234 size_t i = 0;
235
236#ifdef VERBOSE
237 SHAPrintContext(context, "before");
238#endif
239
240 // Compute number of bytes mod 64.
241 size_t index = (context->count[0] >> 3) & 63;
242
243 // Update number of bits.
Peter Boström0c4e06b2015-10-07 12:23:21 +0200244 // TODO: Use uint64_t instead of 2 uint32_t for count.
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000245 // count[0] has low 29 bits for byte count + 3 pad 0's making 32 bits for
246 // bit count.
Peter Boström0c4e06b2015-10-07 12:23:21 +0200247 // Add bit count to low uint32_t
248 context->count[0] += static_cast<uint32_t>(input_len << 3);
249 if (context->count[0] < static_cast<uint32_t>(input_len << 3)) {
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000250 ++context->count[1]; // if overlow (carry), add one to high word
251 }
Peter Boström0c4e06b2015-10-07 12:23:21 +0200252 context->count[1] += static_cast<uint32_t>(input_len >> 29);
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000253 if ((index + input_len) > 63) {
254 i = 64 - index;
255 memcpy(&context->buffer[index], data, i);
256 SHA1Transform(context->state, context->buffer);
257 for (; i + 63 < input_len; i += 64) {
258 SHA1Transform(context->state, data + i);
259 }
260 index = 0;
261 }
262 memcpy(&context->buffer[index], &data[i], input_len - i);
263
264#ifdef VERBOSE
265 SHAPrintContext(context, "after ");
266#endif
267}
268
269// Add padding and return the message digest.
Peter Boström0c4e06b2015-10-07 12:23:21 +0200270void SHA1Final(SHA1_CTX* context, uint8_t digest[SHA1_DIGEST_SIZE]) {
271 uint8_t finalcount[8];
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000272 for (int i = 0; i < 8; ++i) {
273 // Endian independent
Peter Boström0c4e06b2015-10-07 12:23:21 +0200274 finalcount[i] = static_cast<uint8_t>(
275 (context->count[(i >= 4 ? 0 : 1)] >> ((3 - (i & 3)) * 8)) & 255);
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000276 }
Peter Boström0c4e06b2015-10-07 12:23:21 +0200277 SHA1Update(context, reinterpret_cast<const uint8_t*>("\200"), 1);
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000278 while ((context->count[0] & 504) != 448) {
Peter Boström0c4e06b2015-10-07 12:23:21 +0200279 SHA1Update(context, reinterpret_cast<const uint8_t*>("\0"), 1);
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000280 }
281 SHA1Update(context, finalcount, 8); // Should cause a SHA1Transform().
282 for (int i = 0; i < SHA1_DIGEST_SIZE; ++i) {
Peter Boström0c4e06b2015-10-07 12:23:21 +0200283 digest[i] = static_cast<uint8_t>(
284 (context->state[i >> 2] >> ((3 - (i & 3)) * 8)) & 255);
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000285 }
286
287 // Wipe variables.
288 memset(context->buffer, 0, 64);
289 memset(context->state, 0, 20);
290 memset(context->count, 0, 8);
291 memset(finalcount, 0, 8); // SWR
292
293#ifdef SHA1HANDSOFF // Make SHA1Transform overwrite its own static vars.
294 SHA1Transform(context->state, context->buffer);
295#endif
296}
henrike@webrtc.orgc50bf7c2014-05-14 18:24:13 +0000297
298} // namespace rtc