1 /* sha1.c - Functions to compute SHA1 message digest of files or
2 memory blocks according to the NIST specification FIPS-180-1.
4 Copyright (C) 2000, 2001, 2003, 2004, 2005, 2006, 2008 Free Software
7 This program is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by the
9 Free Software Foundation; either version 2, or (at your option) any
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software Foundation,
19 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
21 /* Written by Scott G. Miller
23 Robert Klep <robert@ilse.nl> -- Expansion function fix
34 # include "unlocked-io.h"
37 #ifdef WORDS_BIGENDIAN
41 (((n) << 24) | (((n) & 0xff00) << 8) | (((n) >> 8) & 0xff00) | ((n) >> 24))
44 #define BLOCKSIZE 4096
45 #if BLOCKSIZE % 64 != 0
46 # error "invalid BLOCKSIZE"
49 /* This array contains the bytes used to pad the buffer to the next
50 64-byte boundary. (RFC 1321, 3.1: Step 1) */
51 static const unsigned char fillbuf
[64] = { 0x80, 0 /* , 0, 0, ... */ };
54 /* Take a pointer to a 160 bit block of data (five 32 bit ints) and
55 initialize it to the start constants of the SHA1 algorithm. This
56 must be called before using hash in the call to sha1_hash. */
58 sha1_init_ctx (struct sha1_ctx
*ctx
)
66 ctx
->total
[0] = ctx
->total
[1] = 0;
70 /* Put result from CTX in first 20 bytes following RESBUF. The result
71 must be in little endian byte order.
73 IMPORTANT: On some systems it is required that RESBUF is correctly
74 aligned for a 32-bit value. */
76 sha1_read_ctx (const struct sha1_ctx
*ctx
, void *resbuf
)
78 ((sha1_uint32
*) resbuf
)[0] = SWAP (ctx
->A
);
79 ((sha1_uint32
*) resbuf
)[1] = SWAP (ctx
->B
);
80 ((sha1_uint32
*) resbuf
)[2] = SWAP (ctx
->C
);
81 ((sha1_uint32
*) resbuf
)[3] = SWAP (ctx
->D
);
82 ((sha1_uint32
*) resbuf
)[4] = SWAP (ctx
->E
);
87 /* Process the remaining bytes in the internal buffer and the usual
88 prolog according to the standard and write the result to RESBUF.
90 IMPORTANT: On some systems it is required that RESBUF is correctly
91 aligned for a 32-bit value. */
93 sha1_finish_ctx (struct sha1_ctx
*ctx
, void *resbuf
)
95 /* Take yet unprocessed bytes into account. */
96 sha1_uint32 bytes
= ctx
->buflen
;
97 size_t size
= (bytes
< 56) ? 64 / 4 : 64 * 2 / 4;
99 /* Now count remaining bytes. */
100 ctx
->total
[0] += bytes
;
101 if (ctx
->total
[0] < bytes
)
104 /* Put the 64-bit file length in *bits* at the end of the buffer. */
105 ctx
->buffer
[size
- 2] = SWAP ((ctx
->total
[1] << 3) | (ctx
->total
[0] >> 29));
106 ctx
->buffer
[size
- 1] = SWAP (ctx
->total
[0] << 3);
108 memcpy (&((char *) ctx
->buffer
)[bytes
], fillbuf
, (size
- 2) * 4 - bytes
);
110 /* Process last bytes. */
111 sha1_process_block (ctx
->buffer
, size
* 4, ctx
);
113 return sha1_read_ctx (ctx
, resbuf
);
116 /* Compute SHA1 message digest for bytes read from STREAM. The
117 resulting message digest number will be written into the 16 bytes
118 beginning at RESBLOCK. */
120 sha1_stream (FILE *stream
, void *resblock
)
123 char buffer
[BLOCKSIZE
+ 72];
126 /* Initialize the computation context. */
127 sha1_init_ctx (&ctx
);
129 /* Iterate over full file contents. */
132 /* We read the file in blocks of BLOCKSIZE bytes. One call of the
133 computation function processes the whole buffer so that with the
134 next round of the loop another block can be read. */
138 /* Read block. Take care for partial reads. */
141 n
= fread (buffer
+ sum
, 1, BLOCKSIZE
- sum
, stream
);
145 if (sum
== BLOCKSIZE
)
150 /* Check for the error flag IFF N == 0, so that we don't
151 exit the loop after a partial read due to e.g., EAGAIN
155 goto process_partial_block
;
158 /* We've read at least one byte, so ignore errors. But always
159 check for EOF, since feof may be true even though N > 0.
160 Otherwise, we could end up calling fread after EOF. */
162 goto process_partial_block
;
165 /* Process buffer with BLOCKSIZE bytes. Note that
168 sha1_process_block (buffer
, BLOCKSIZE
, &ctx
);
171 process_partial_block
:;
173 /* Process any remaining bytes. */
175 sha1_process_bytes (buffer
, sum
, &ctx
);
177 /* Construct result in desired memory. */
178 sha1_finish_ctx (&ctx
, resblock
);
182 /* Compute SHA1 message digest for LEN bytes beginning at BUFFER. The
183 result is always in little endian byte order, so that a byte-wise
184 output yields to the wanted ASCII representation of the message
187 sha1_buffer (const char *buffer
, size_t len
, void *resblock
)
191 /* Initialize the computation context. */
192 sha1_init_ctx (&ctx
);
194 /* Process whole buffer but last len % 64 bytes. */
195 sha1_process_bytes (buffer
, len
, &ctx
);
197 /* Put result in desired memory area. */
198 return sha1_finish_ctx (&ctx
, resblock
);
202 sha1_process_bytes (const void *buffer
, size_t len
, struct sha1_ctx
*ctx
)
204 /* When we already have some bits in our internal buffer concatenate
205 both inputs first. */
206 if (ctx
->buflen
!= 0)
208 size_t left_over
= ctx
->buflen
;
209 size_t add
= 128 - left_over
> len
? len
: 128 - left_over
;
211 memcpy (&((char *) ctx
->buffer
)[left_over
], buffer
, add
);
214 if (ctx
->buflen
> 64)
216 sha1_process_block (ctx
->buffer
, ctx
->buflen
& ~63, ctx
);
219 /* The regions in the following copy operation cannot overlap. */
221 &((char *) ctx
->buffer
)[(left_over
+ add
) & ~63],
225 buffer
= (const char *) buffer
+ add
;
229 /* Process available complete blocks. */
232 #if !_STRING_ARCH_unaligned
233 # define alignof(type) offsetof (struct { char c; type x; }, x)
234 # define UNALIGNED_P(p) (((size_t) p) % alignof (sha1_uint32) != 0)
235 if (UNALIGNED_P (buffer
))
238 sha1_process_block (memcpy (ctx
->buffer
, buffer
, 64), 64, ctx
);
239 buffer
= (const char *) buffer
+ 64;
245 sha1_process_block (buffer
, len
& ~63, ctx
);
246 buffer
= (const char *) buffer
+ (len
& ~63);
251 /* Move remaining bytes in internal buffer. */
254 size_t left_over
= ctx
->buflen
;
256 memcpy (&((char *) ctx
->buffer
)[left_over
], buffer
, len
);
260 sha1_process_block (ctx
->buffer
, 64, ctx
);
262 memcpy (ctx
->buffer
, &ctx
->buffer
[16], left_over
);
264 ctx
->buflen
= left_over
;
268 /* --- Code below is the primary difference between md5.c and sha1.c --- */
270 /* SHA1 round constants */
271 #define K1 0x5a827999
272 #define K2 0x6ed9eba1
273 #define K3 0x8f1bbcdc
274 #define K4 0xca62c1d6
276 /* Round functions. Note that F2 is the same as F4. */
277 #define F1(B,C,D) ( D ^ ( B & ( C ^ D ) ) )
278 #define F2(B,C,D) (B ^ C ^ D)
279 #define F3(B,C,D) ( ( B & C ) | ( D & ( B | C ) ) )
280 #define F4(B,C,D) (B ^ C ^ D)
282 /* Process LEN bytes of BUFFER, accumulating context into CTX.
283 It is assumed that LEN % 64 == 0.
284 Most of this code comes from GnuPG's cipher/sha1.c. */
287 sha1_process_block (const void *buffer
, size_t len
, struct sha1_ctx
*ctx
)
289 const sha1_uint32
*words
= (const sha1_uint32
*) buffer
;
290 size_t nwords
= len
/ sizeof (sha1_uint32
);
291 const sha1_uint32
*endp
= words
+ nwords
;
293 sha1_uint32 a
= ctx
->A
;
294 sha1_uint32 b
= ctx
->B
;
295 sha1_uint32 c
= ctx
->C
;
296 sha1_uint32 d
= ctx
->D
;
297 sha1_uint32 e
= ctx
->E
;
299 /* First increment the byte count. RFC 1321 specifies the possible
300 length of the file up to 2^64 bits. Here we only compute the
301 number of bytes. Do a double word increment. */
302 ctx
->total
[0] += len
;
303 if (ctx
->total
[0] < len
)
306 #define rol(x, n) (((x) << (n)) | ((sha1_uint32) (x) >> (32 - (n))))
308 #define M(I) ( tm = x[I&0x0f] ^ x[(I-14)&0x0f] \
309 ^ x[(I-8)&0x0f] ^ x[(I-3)&0x0f] \
310 , (x[I&0x0f] = rol(tm, 1)) )
312 #define R(A,B,C,D,E,F,K,M) do { E += rol( A, 5 ) \
323 for (t
= 0; t
< 16; t
++)
325 x
[t
] = SWAP (*words
);
329 R( a
, b
, c
, d
, e
, F1
, K1
, x
[ 0] );
330 R( e
, a
, b
, c
, d
, F1
, K1
, x
[ 1] );
331 R( d
, e
, a
, b
, c
, F1
, K1
, x
[ 2] );
332 R( c
, d
, e
, a
, b
, F1
, K1
, x
[ 3] );
333 R( b
, c
, d
, e
, a
, F1
, K1
, x
[ 4] );
334 R( a
, b
, c
, d
, e
, F1
, K1
, x
[ 5] );
335 R( e
, a
, b
, c
, d
, F1
, K1
, x
[ 6] );
336 R( d
, e
, a
, b
, c
, F1
, K1
, x
[ 7] );
337 R( c
, d
, e
, a
, b
, F1
, K1
, x
[ 8] );
338 R( b
, c
, d
, e
, a
, F1
, K1
, x
[ 9] );
339 R( a
, b
, c
, d
, e
, F1
, K1
, x
[10] );
340 R( e
, a
, b
, c
, d
, F1
, K1
, x
[11] );
341 R( d
, e
, a
, b
, c
, F1
, K1
, x
[12] );
342 R( c
, d
, e
, a
, b
, F1
, K1
, x
[13] );
343 R( b
, c
, d
, e
, a
, F1
, K1
, x
[14] );
344 R( a
, b
, c
, d
, e
, F1
, K1
, x
[15] );
345 R( e
, a
, b
, c
, d
, F1
, K1
, M(16) );
346 R( d
, e
, a
, b
, c
, F1
, K1
, M(17) );
347 R( c
, d
, e
, a
, b
, F1
, K1
, M(18) );
348 R( b
, c
, d
, e
, a
, F1
, K1
, M(19) );
349 R( a
, b
, c
, d
, e
, F2
, K2
, M(20) );
350 R( e
, a
, b
, c
, d
, F2
, K2
, M(21) );
351 R( d
, e
, a
, b
, c
, F2
, K2
, M(22) );
352 R( c
, d
, e
, a
, b
, F2
, K2
, M(23) );
353 R( b
, c
, d
, e
, a
, F2
, K2
, M(24) );
354 R( a
, b
, c
, d
, e
, F2
, K2
, M(25) );
355 R( e
, a
, b
, c
, d
, F2
, K2
, M(26) );
356 R( d
, e
, a
, b
, c
, F2
, K2
, M(27) );
357 R( c
, d
, e
, a
, b
, F2
, K2
, M(28) );
358 R( b
, c
, d
, e
, a
, F2
, K2
, M(29) );
359 R( a
, b
, c
, d
, e
, F2
, K2
, M(30) );
360 R( e
, a
, b
, c
, d
, F2
, K2
, M(31) );
361 R( d
, e
, a
, b
, c
, F2
, K2
, M(32) );
362 R( c
, d
, e
, a
, b
, F2
, K2
, M(33) );
363 R( b
, c
, d
, e
, a
, F2
, K2
, M(34) );
364 R( a
, b
, c
, d
, e
, F2
, K2
, M(35) );
365 R( e
, a
, b
, c
, d
, F2
, K2
, M(36) );
366 R( d
, e
, a
, b
, c
, F2
, K2
, M(37) );
367 R( c
, d
, e
, a
, b
, F2
, K2
, M(38) );
368 R( b
, c
, d
, e
, a
, F2
, K2
, M(39) );
369 R( a
, b
, c
, d
, e
, F3
, K3
, M(40) );
370 R( e
, a
, b
, c
, d
, F3
, K3
, M(41) );
371 R( d
, e
, a
, b
, c
, F3
, K3
, M(42) );
372 R( c
, d
, e
, a
, b
, F3
, K3
, M(43) );
373 R( b
, c
, d
, e
, a
, F3
, K3
, M(44) );
374 R( a
, b
, c
, d
, e
, F3
, K3
, M(45) );
375 R( e
, a
, b
, c
, d
, F3
, K3
, M(46) );
376 R( d
, e
, a
, b
, c
, F3
, K3
, M(47) );
377 R( c
, d
, e
, a
, b
, F3
, K3
, M(48) );
378 R( b
, c
, d
, e
, a
, F3
, K3
, M(49) );
379 R( a
, b
, c
, d
, e
, F3
, K3
, M(50) );
380 R( e
, a
, b
, c
, d
, F3
, K3
, M(51) );
381 R( d
, e
, a
, b
, c
, F3
, K3
, M(52) );
382 R( c
, d
, e
, a
, b
, F3
, K3
, M(53) );
383 R( b
, c
, d
, e
, a
, F3
, K3
, M(54) );
384 R( a
, b
, c
, d
, e
, F3
, K3
, M(55) );
385 R( e
, a
, b
, c
, d
, F3
, K3
, M(56) );
386 R( d
, e
, a
, b
, c
, F3
, K3
, M(57) );
387 R( c
, d
, e
, a
, b
, F3
, K3
, M(58) );
388 R( b
, c
, d
, e
, a
, F3
, K3
, M(59) );
389 R( a
, b
, c
, d
, e
, F4
, K4
, M(60) );
390 R( e
, a
, b
, c
, d
, F4
, K4
, M(61) );
391 R( d
, e
, a
, b
, c
, F4
, K4
, M(62) );
392 R( c
, d
, e
, a
, b
, F4
, K4
, M(63) );
393 R( b
, c
, d
, e
, a
, F4
, K4
, M(64) );
394 R( a
, b
, c
, d
, e
, F4
, K4
, M(65) );
395 R( e
, a
, b
, c
, d
, F4
, K4
, M(66) );
396 R( d
, e
, a
, b
, c
, F4
, K4
, M(67) );
397 R( c
, d
, e
, a
, b
, F4
, K4
, M(68) );
398 R( b
, c
, d
, e
, a
, F4
, K4
, M(69) );
399 R( a
, b
, c
, d
, e
, F4
, K4
, M(70) );
400 R( e
, a
, b
, c
, d
, F4
, K4
, M(71) );
401 R( d
, e
, a
, b
, c
, F4
, K4
, M(72) );
402 R( c
, d
, e
, a
, b
, F4
, K4
, M(73) );
403 R( b
, c
, d
, e
, a
, F4
, K4
, M(74) );
404 R( a
, b
, c
, d
, e
, F4
, K4
, M(75) );
405 R( e
, a
, b
, c
, d
, F4
, K4
, M(76) );
406 R( d
, e
, a
, b
, c
, F4
, K4
, M(77) );
407 R( c
, d
, e
, a
, b
, F4
, K4
, M(78) );
408 R( b
, c
, d
, e
, a
, F4
, K4
, M(79) );
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