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80a47a2c TK |
1 | /* |
2 | * FIPS-180-2 compliant SHA-256 implementation | |
3 | * | |
4 | * Based on XySSL: Copyright (C) 2006-2008 Christophe Devine | |
5 | * | |
6 | * Copyright (C) 2009 Paul Bakker <polarssl_maintainer at polarssl dot org> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License along | |
19 | * with this program; if not, write to the Free Software Foundation, Inc., | |
20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
21 | */ | |
22 | /* | |
23 | * The SHA-256 Secure Hash Standard was published by NIST in 2002. | |
24 | * | |
25 | * http://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf | |
26 | */ | |
27 | ||
28 | /* $Cambridge: exim/src/src/pdkim/sha2.c,v 1.2 2009/06/10 07:34:05 tom Exp $ */ | |
29 | ||
30 | #include "sha2.h" | |
31 | ||
32 | #include <string.h> | |
33 | #include <stdio.h> | |
34 | ||
35 | /* | |
36 | * 32-bit integer manipulation macros (big endian) | |
37 | */ | |
38 | #ifndef GET_ULONG_BE | |
39 | #define GET_ULONG_BE(n,b,i) \ | |
40 | { \ | |
41 | (n) = ( (unsigned long) (b)[(i) ] << 24 ) \ | |
42 | | ( (unsigned long) (b)[(i) + 1] << 16 ) \ | |
43 | | ( (unsigned long) (b)[(i) + 2] << 8 ) \ | |
44 | | ( (unsigned long) (b)[(i) + 3] ); \ | |
45 | } | |
46 | #endif | |
47 | ||
48 | #ifndef PUT_ULONG_BE | |
49 | #define PUT_ULONG_BE(n,b,i) \ | |
50 | { \ | |
51 | (b)[(i) ] = (unsigned char) ( (n) >> 24 ); \ | |
52 | (b)[(i) + 1] = (unsigned char) ( (n) >> 16 ); \ | |
53 | (b)[(i) + 2] = (unsigned char) ( (n) >> 8 ); \ | |
54 | (b)[(i) + 3] = (unsigned char) ( (n) ); \ | |
55 | } | |
56 | #endif | |
57 | ||
58 | /* | |
59 | * SHA-256 context setup | |
60 | */ | |
61 | void sha2_starts( sha2_context *ctx, int is224 ) | |
62 | { | |
63 | ctx->total[0] = 0; | |
64 | ctx->total[1] = 0; | |
65 | ||
66 | if( is224 == 0 ) | |
67 | { | |
68 | /* SHA-256 */ | |
69 | ctx->state[0] = 0x6A09E667; | |
70 | ctx->state[1] = 0xBB67AE85; | |
71 | ctx->state[2] = 0x3C6EF372; | |
72 | ctx->state[3] = 0xA54FF53A; | |
73 | ctx->state[4] = 0x510E527F; | |
74 | ctx->state[5] = 0x9B05688C; | |
75 | ctx->state[6] = 0x1F83D9AB; | |
76 | ctx->state[7] = 0x5BE0CD19; | |
77 | } | |
78 | else | |
79 | { | |
80 | /* SHA-224 */ | |
81 | ctx->state[0] = 0xC1059ED8; | |
82 | ctx->state[1] = 0x367CD507; | |
83 | ctx->state[2] = 0x3070DD17; | |
84 | ctx->state[3] = 0xF70E5939; | |
85 | ctx->state[4] = 0xFFC00B31; | |
86 | ctx->state[5] = 0x68581511; | |
87 | ctx->state[6] = 0x64F98FA7; | |
88 | ctx->state[7] = 0xBEFA4FA4; | |
89 | } | |
90 | ||
91 | ctx->is224 = is224; | |
92 | } | |
93 | ||
94 | static void sha2_process( sha2_context *ctx, unsigned char data[64] ) | |
95 | { | |
96 | unsigned long temp1, temp2, W[64]; | |
97 | unsigned long A, B, C, D, E, F, G, H; | |
98 | ||
99 | GET_ULONG_BE( W[ 0], data, 0 ); | |
100 | GET_ULONG_BE( W[ 1], data, 4 ); | |
101 | GET_ULONG_BE( W[ 2], data, 8 ); | |
102 | GET_ULONG_BE( W[ 3], data, 12 ); | |
103 | GET_ULONG_BE( W[ 4], data, 16 ); | |
104 | GET_ULONG_BE( W[ 5], data, 20 ); | |
105 | GET_ULONG_BE( W[ 6], data, 24 ); | |
106 | GET_ULONG_BE( W[ 7], data, 28 ); | |
107 | GET_ULONG_BE( W[ 8], data, 32 ); | |
108 | GET_ULONG_BE( W[ 9], data, 36 ); | |
109 | GET_ULONG_BE( W[10], data, 40 ); | |
110 | GET_ULONG_BE( W[11], data, 44 ); | |
111 | GET_ULONG_BE( W[12], data, 48 ); | |
112 | GET_ULONG_BE( W[13], data, 52 ); | |
113 | GET_ULONG_BE( W[14], data, 56 ); | |
114 | GET_ULONG_BE( W[15], data, 60 ); | |
115 | ||
116 | #define SHR(x,n) ((x & 0xFFFFFFFF) >> n) | |
117 | #define ROTR(x,n) (SHR(x,n) | (x << (32 - n))) | |
118 | ||
119 | #define S0(x) (ROTR(x, 7) ^ ROTR(x,18) ^ SHR(x, 3)) | |
120 | #define S1(x) (ROTR(x,17) ^ ROTR(x,19) ^ SHR(x,10)) | |
121 | ||
122 | #define S2(x) (ROTR(x, 2) ^ ROTR(x,13) ^ ROTR(x,22)) | |
123 | #define S3(x) (ROTR(x, 6) ^ ROTR(x,11) ^ ROTR(x,25)) | |
124 | ||
125 | #define F0(x,y,z) ((x & y) | (z & (x | y))) | |
126 | #define F1(x,y,z) (z ^ (x & (y ^ z))) | |
127 | ||
128 | #define R(t) \ | |
129 | ( \ | |
130 | W[t] = S1(W[t - 2]) + W[t - 7] + \ | |
131 | S0(W[t - 15]) + W[t - 16] \ | |
132 | ) | |
133 | ||
134 | #define P(a,b,c,d,e,f,g,h,x,K) \ | |
135 | { \ | |
136 | temp1 = h + S3(e) + F1(e,f,g) + K + x; \ | |
137 | temp2 = S2(a) + F0(a,b,c); \ | |
138 | d += temp1; h = temp1 + temp2; \ | |
139 | } | |
140 | ||
141 | A = ctx->state[0]; | |
142 | B = ctx->state[1]; | |
143 | C = ctx->state[2]; | |
144 | D = ctx->state[3]; | |
145 | E = ctx->state[4]; | |
146 | F = ctx->state[5]; | |
147 | G = ctx->state[6]; | |
148 | H = ctx->state[7]; | |
149 | ||
150 | P( A, B, C, D, E, F, G, H, W[ 0], 0x428A2F98 ); | |
151 | P( H, A, B, C, D, E, F, G, W[ 1], 0x71374491 ); | |
152 | P( G, H, A, B, C, D, E, F, W[ 2], 0xB5C0FBCF ); | |
153 | P( F, G, H, A, B, C, D, E, W[ 3], 0xE9B5DBA5 ); | |
154 | P( E, F, G, H, A, B, C, D, W[ 4], 0x3956C25B ); | |
155 | P( D, E, F, G, H, A, B, C, W[ 5], 0x59F111F1 ); | |
156 | P( C, D, E, F, G, H, A, B, W[ 6], 0x923F82A4 ); | |
157 | P( B, C, D, E, F, G, H, A, W[ 7], 0xAB1C5ED5 ); | |
158 | P( A, B, C, D, E, F, G, H, W[ 8], 0xD807AA98 ); | |
159 | P( H, A, B, C, D, E, F, G, W[ 9], 0x12835B01 ); | |
160 | P( G, H, A, B, C, D, E, F, W[10], 0x243185BE ); | |
161 | P( F, G, H, A, B, C, D, E, W[11], 0x550C7DC3 ); | |
162 | P( E, F, G, H, A, B, C, D, W[12], 0x72BE5D74 ); | |
163 | P( D, E, F, G, H, A, B, C, W[13], 0x80DEB1FE ); | |
164 | P( C, D, E, F, G, H, A, B, W[14], 0x9BDC06A7 ); | |
165 | P( B, C, D, E, F, G, H, A, W[15], 0xC19BF174 ); | |
166 | P( A, B, C, D, E, F, G, H, R(16), 0xE49B69C1 ); | |
167 | P( H, A, B, C, D, E, F, G, R(17), 0xEFBE4786 ); | |
168 | P( G, H, A, B, C, D, E, F, R(18), 0x0FC19DC6 ); | |
169 | P( F, G, H, A, B, C, D, E, R(19), 0x240CA1CC ); | |
170 | P( E, F, G, H, A, B, C, D, R(20), 0x2DE92C6F ); | |
171 | P( D, E, F, G, H, A, B, C, R(21), 0x4A7484AA ); | |
172 | P( C, D, E, F, G, H, A, B, R(22), 0x5CB0A9DC ); | |
173 | P( B, C, D, E, F, G, H, A, R(23), 0x76F988DA ); | |
174 | P( A, B, C, D, E, F, G, H, R(24), 0x983E5152 ); | |
175 | P( H, A, B, C, D, E, F, G, R(25), 0xA831C66D ); | |
176 | P( G, H, A, B, C, D, E, F, R(26), 0xB00327C8 ); | |
177 | P( F, G, H, A, B, C, D, E, R(27), 0xBF597FC7 ); | |
178 | P( E, F, G, H, A, B, C, D, R(28), 0xC6E00BF3 ); | |
179 | P( D, E, F, G, H, A, B, C, R(29), 0xD5A79147 ); | |
180 | P( C, D, E, F, G, H, A, B, R(30), 0x06CA6351 ); | |
181 | P( B, C, D, E, F, G, H, A, R(31), 0x14292967 ); | |
182 | P( A, B, C, D, E, F, G, H, R(32), 0x27B70A85 ); | |
183 | P( H, A, B, C, D, E, F, G, R(33), 0x2E1B2138 ); | |
184 | P( G, H, A, B, C, D, E, F, R(34), 0x4D2C6DFC ); | |
185 | P( F, G, H, A, B, C, D, E, R(35), 0x53380D13 ); | |
186 | P( E, F, G, H, A, B, C, D, R(36), 0x650A7354 ); | |
187 | P( D, E, F, G, H, A, B, C, R(37), 0x766A0ABB ); | |
188 | P( C, D, E, F, G, H, A, B, R(38), 0x81C2C92E ); | |
189 | P( B, C, D, E, F, G, H, A, R(39), 0x92722C85 ); | |
190 | P( A, B, C, D, E, F, G, H, R(40), 0xA2BFE8A1 ); | |
191 | P( H, A, B, C, D, E, F, G, R(41), 0xA81A664B ); | |
192 | P( G, H, A, B, C, D, E, F, R(42), 0xC24B8B70 ); | |
193 | P( F, G, H, A, B, C, D, E, R(43), 0xC76C51A3 ); | |
194 | P( E, F, G, H, A, B, C, D, R(44), 0xD192E819 ); | |
195 | P( D, E, F, G, H, A, B, C, R(45), 0xD6990624 ); | |
196 | P( C, D, E, F, G, H, A, B, R(46), 0xF40E3585 ); | |
197 | P( B, C, D, E, F, G, H, A, R(47), 0x106AA070 ); | |
198 | P( A, B, C, D, E, F, G, H, R(48), 0x19A4C116 ); | |
199 | P( H, A, B, C, D, E, F, G, R(49), 0x1E376C08 ); | |
200 | P( G, H, A, B, C, D, E, F, R(50), 0x2748774C ); | |
201 | P( F, G, H, A, B, C, D, E, R(51), 0x34B0BCB5 ); | |
202 | P( E, F, G, H, A, B, C, D, R(52), 0x391C0CB3 ); | |
203 | P( D, E, F, G, H, A, B, C, R(53), 0x4ED8AA4A ); | |
204 | P( C, D, E, F, G, H, A, B, R(54), 0x5B9CCA4F ); | |
205 | P( B, C, D, E, F, G, H, A, R(55), 0x682E6FF3 ); | |
206 | P( A, B, C, D, E, F, G, H, R(56), 0x748F82EE ); | |
207 | P( H, A, B, C, D, E, F, G, R(57), 0x78A5636F ); | |
208 | P( G, H, A, B, C, D, E, F, R(58), 0x84C87814 ); | |
209 | P( F, G, H, A, B, C, D, E, R(59), 0x8CC70208 ); | |
210 | P( E, F, G, H, A, B, C, D, R(60), 0x90BEFFFA ); | |
211 | P( D, E, F, G, H, A, B, C, R(61), 0xA4506CEB ); | |
212 | P( C, D, E, F, G, H, A, B, R(62), 0xBEF9A3F7 ); | |
213 | P( B, C, D, E, F, G, H, A, R(63), 0xC67178F2 ); | |
214 | ||
215 | ctx->state[0] += A; | |
216 | ctx->state[1] += B; | |
217 | ctx->state[2] += C; | |
218 | ctx->state[3] += D; | |
219 | ctx->state[4] += E; | |
220 | ctx->state[5] += F; | |
221 | ctx->state[6] += G; | |
222 | ctx->state[7] += H; | |
223 | } | |
224 | ||
225 | /* | |
226 | * SHA-256 process buffer | |
227 | */ | |
228 | void sha2_update( sha2_context *ctx, unsigned char *input, int ilen ) | |
229 | { | |
230 | int fill; | |
231 | unsigned long left; | |
232 | ||
233 | if( ilen <= 0 ) | |
234 | return; | |
235 | ||
236 | left = ctx->total[0] & 0x3F; | |
237 | fill = 64 - left; | |
238 | ||
239 | ctx->total[0] += ilen; | |
240 | ctx->total[0] &= 0xFFFFFFFF; | |
241 | ||
242 | if( ctx->total[0] < (unsigned long) ilen ) | |
243 | ctx->total[1]++; | |
244 | ||
245 | if( left && ilen >= fill ) | |
246 | { | |
247 | memcpy( (void *) (ctx->buffer + left), | |
248 | (void *) input, fill ); | |
249 | sha2_process( ctx, ctx->buffer ); | |
250 | input += fill; | |
251 | ilen -= fill; | |
252 | left = 0; | |
253 | } | |
254 | ||
255 | while( ilen >= 64 ) | |
256 | { | |
257 | sha2_process( ctx, input ); | |
258 | input += 64; | |
259 | ilen -= 64; | |
260 | } | |
261 | ||
262 | if( ilen > 0 ) | |
263 | { | |
264 | memcpy( (void *) (ctx->buffer + left), | |
265 | (void *) input, ilen ); | |
266 | } | |
267 | } | |
268 | ||
269 | static const unsigned char sha2_padding[64] = | |
270 | { | |
271 | 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
272 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
273 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
274 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
275 | }; | |
276 | ||
277 | /* | |
278 | * SHA-256 final digest | |
279 | */ | |
280 | void sha2_finish( sha2_context *ctx, unsigned char output[32] ) | |
281 | { | |
282 | unsigned long last, padn; | |
283 | unsigned long high, low; | |
284 | unsigned char msglen[8]; | |
285 | ||
286 | high = ( ctx->total[0] >> 29 ) | |
287 | | ( ctx->total[1] << 3 ); | |
288 | low = ( ctx->total[0] << 3 ); | |
289 | ||
290 | PUT_ULONG_BE( high, msglen, 0 ); | |
291 | PUT_ULONG_BE( low, msglen, 4 ); | |
292 | ||
293 | last = ctx->total[0] & 0x3F; | |
294 | padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last ); | |
295 | ||
296 | sha2_update( ctx, (unsigned char *) sha2_padding, padn ); | |
297 | sha2_update( ctx, msglen, 8 ); | |
298 | ||
299 | PUT_ULONG_BE( ctx->state[0], output, 0 ); | |
300 | PUT_ULONG_BE( ctx->state[1], output, 4 ); | |
301 | PUT_ULONG_BE( ctx->state[2], output, 8 ); | |
302 | PUT_ULONG_BE( ctx->state[3], output, 12 ); | |
303 | PUT_ULONG_BE( ctx->state[4], output, 16 ); | |
304 | PUT_ULONG_BE( ctx->state[5], output, 20 ); | |
305 | PUT_ULONG_BE( ctx->state[6], output, 24 ); | |
306 | ||
307 | if( ctx->is224 == 0 ) | |
308 | PUT_ULONG_BE( ctx->state[7], output, 28 ); | |
309 | } | |
310 | ||
311 | /* | |
312 | * output = SHA-256( input buffer ) | |
313 | */ | |
314 | void sha2( unsigned char *input, int ilen, | |
315 | unsigned char output[32], int is224 ) | |
316 | { | |
317 | sha2_context ctx; | |
318 | ||
319 | sha2_starts( &ctx, is224 ); | |
320 | sha2_update( &ctx, input, ilen ); | |
321 | sha2_finish( &ctx, output ); | |
322 | ||
323 | memset( &ctx, 0, sizeof( sha2_context ) ); | |
324 | } | |
325 | ||
326 | /* | |
327 | * output = SHA-256( file contents ) | |
328 | */ | |
329 | int sha2_file( char *path, unsigned char output[32], int is224 ) | |
330 | { | |
331 | FILE *f; | |
332 | size_t n; | |
333 | sha2_context ctx; | |
334 | unsigned char buf[1024]; | |
335 | ||
336 | if( ( f = fopen( path, "rb" ) ) == NULL ) | |
337 | return( 1 ); | |
338 | ||
339 | sha2_starts( &ctx, is224 ); | |
340 | ||
341 | while( ( n = fread( buf, 1, sizeof( buf ), f ) ) > 0 ) | |
342 | sha2_update( &ctx, buf, (int) n ); | |
343 | ||
344 | sha2_finish( &ctx, output ); | |
345 | ||
346 | memset( &ctx, 0, sizeof( sha2_context ) ); | |
347 | ||
348 | if( ferror( f ) != 0 ) | |
349 | { | |
350 | fclose( f ); | |
351 | return( 2 ); | |
352 | } | |
353 | ||
354 | fclose( f ); | |
355 | return( 0 ); | |
356 | } | |
357 | ||
358 | /* | |
359 | * SHA-256 HMAC context setup | |
360 | */ | |
361 | void sha2_hmac_starts( sha2_context *ctx, unsigned char *key, int keylen, | |
362 | int is224 ) | |
363 | { | |
364 | int i; | |
365 | unsigned char sum[32]; | |
366 | ||
367 | if( keylen > 64 ) | |
368 | { | |
369 | sha2( key, keylen, sum, is224 ); | |
370 | keylen = ( is224 ) ? 28 : 32; | |
371 | key = sum; | |
372 | } | |
373 | ||
374 | memset( ctx->ipad, 0x36, 64 ); | |
375 | memset( ctx->opad, 0x5C, 64 ); | |
376 | ||
377 | for( i = 0; i < keylen; i++ ) | |
378 | { | |
379 | ctx->ipad[i] = (unsigned char)( ctx->ipad[i] ^ key[i] ); | |
380 | ctx->opad[i] = (unsigned char)( ctx->opad[i] ^ key[i] ); | |
381 | } | |
382 | ||
383 | sha2_starts( ctx, is224 ); | |
384 | sha2_update( ctx, ctx->ipad, 64 ); | |
385 | ||
386 | memset( sum, 0, sizeof( sum ) ); | |
387 | } | |
388 | ||
389 | /* | |
390 | * SHA-256 HMAC process buffer | |
391 | */ | |
392 | void sha2_hmac_update( sha2_context *ctx, unsigned char *input, int ilen ) | |
393 | { | |
394 | sha2_update( ctx, input, ilen ); | |
395 | } | |
396 | ||
397 | /* | |
398 | * SHA-256 HMAC final digest | |
399 | */ | |
400 | void sha2_hmac_finish( sha2_context *ctx, unsigned char output[32] ) | |
401 | { | |
402 | int is224, hlen; | |
403 | unsigned char tmpbuf[32]; | |
404 | ||
405 | is224 = ctx->is224; | |
406 | hlen = ( is224 == 0 ) ? 32 : 28; | |
407 | ||
408 | sha2_finish( ctx, tmpbuf ); | |
409 | sha2_starts( ctx, is224 ); | |
410 | sha2_update( ctx, ctx->opad, 64 ); | |
411 | sha2_update( ctx, tmpbuf, hlen ); | |
412 | sha2_finish( ctx, output ); | |
413 | ||
414 | memset( tmpbuf, 0, sizeof( tmpbuf ) ); | |
415 | } | |
416 | ||
417 | /* | |
418 | * output = HMAC-SHA-256( hmac key, input buffer ) | |
419 | */ | |
420 | void sha2_hmac( unsigned char *key, int keylen, | |
421 | unsigned char *input, int ilen, | |
422 | unsigned char output[32], int is224 ) | |
423 | { | |
424 | sha2_context ctx; | |
425 | ||
426 | sha2_hmac_starts( &ctx, key, keylen, is224 ); | |
427 | sha2_hmac_update( &ctx, input, ilen ); | |
428 | sha2_hmac_finish( &ctx, output ); | |
429 | ||
430 | memset( &ctx, 0, sizeof( sha2_context ) ); | |
431 | } |