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1/* Functions to compute MD5 message digest of files or memory blocks.
2 according to the definition of MD5 in RFC 1321 from April 1992.
3 Copyright (C) 1995,1996,1997,1999,2000,2001,2005,2006
4 Free Software Foundation, Inc.
5 This file is part of the GNU C Library.
6
7 This program is free software; you can redistribute it and/or modify it
8 under the terms of the GNU Lesser General Public License as published by the
9 Free Software Foundation; either version 2.1, or (at your option) any
10 later version.
11
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 Lesser General Public License for more details.
16
17 You should have received a copy of the GNU Lesser 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. */
20
21/* Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995. */
22
23#include "MHD_config.h"
24
25#include "md5.h"
26
27#include <stddef.h>
28#include <stdlib.h>
29#include <string.h>
30#include <sys/types.h>
31
32#if USE_UNLOCKED_IO
33# include "unlocked-io.h"
34#endif
35
36#ifdef _LIBC
37# include <endian.h>
38# if __BYTE_ORDER == __BIG_ENDIAN
39# define WORDS_BIGENDIAN 1
40# endif
41/* We need to keep the namespace clean so define the MD5 function
42 protected using leading __ . */
43# define MHD_md5_init_ctx __MHD_md5_init_ctx
44# define MHD_md5_process_block __MHD_md5_process_block
45# define MHD_md5_process_bytes __MHD_md5_process_bytes
46# define MHD_md5_finish_ctx __MHD_md5_finish_ctx
47# define MHD_md5_read_ctx __MHD_md5_read_ctx
48# define MHD_md5_stream __MHD_md5_stream
49# define MHD_md5_buffer __MHD_md5_buffer
50#endif
51
52#ifdef WORDS_BIGENDIAN
53# define SWAP(n) \
54 (((n) << 24) | (((n) & 0xff00) << 8) | (((n) >> 8) & 0xff00) | ((n) >> 24))
55#else
56# define SWAP(n) (n)
57#endif
58
59#define BLOCKSIZE 4096
60#if BLOCKSIZE % 64 != 0
61# error "invalid BLOCKSIZE"
62#endif
63
64/* This array contains the bytes used to pad the buffer to the next
65 64-byte boundary. (RFC 1321, 3.1: Step 1) */
66static const unsigned char fillbuf[64] = { 0x80, 0 /* , 0, 0, ... */ };
67
68
69/* Initialize structure containing state of computation.
70 (RFC 1321, 3.3: Step 3) */
71void
72MHD_md5_init_ctx (struct MHD_md5_ctx *ctx)
73{
74 ctx->A = 0x67452301;
75 ctx->B = 0xefcdab89;
76 ctx->C = 0x98badcfe;
77 ctx->D = 0x10325476;
78
79 ctx->total[0] = ctx->total[1] = 0;
80 ctx->buflen = 0;
81}
82
83/* Put result from CTX in first 16 bytes following RESBUF. The result
84 must be in little endian byte order.
85
86 IMPORTANT: On some systems it is required that RESBUF is correctly
87 aligned for a 32-bit value. */
88void *
89MHD_md5_read_ctx (const struct MHD_md5_ctx *ctx, void *resbuf)
90{
91 ((uint32_t *) resbuf)[0] = SWAP (ctx->A);
92 ((uint32_t *) resbuf)[1] = SWAP (ctx->B);
93 ((uint32_t *) resbuf)[2] = SWAP (ctx->C);
94 ((uint32_t *) resbuf)[3] = SWAP (ctx->D);
95
96 return resbuf;
97}
98
99/* Process the remaining bytes in the internal buffer and the usual
100 prolog according to the standard and write the result to RESBUF.
101
102 IMPORTANT: On some systems it is required that RESBUF is correctly
103 aligned for a 32-bit value. */
104void *
105MHD_md5_finish_ctx (struct MHD_md5_ctx *ctx, void *resbuf)
106{
107 /* Take yet unprocessed bytes into account. */
108 uint32_t bytes = ctx->buflen;
109 size_t size = (bytes < 56) ? 64 / 4 : 64 * 2 / 4;
110
111 /* Now count remaining bytes. */
112 ctx->total[0] += bytes;
113 if (ctx->total[0] < bytes)
114 ++ctx->total[1];
115
116 /* Put the 64-bit file length in *bits* at the end of the buffer. */
117 ctx->buffer[size - 2] = SWAP (ctx->total[0] << 3);
118 ctx->buffer[size - 1] = SWAP ((ctx->total[1] << 3) | (ctx->total[0] >> 29));
119
120 memcpy (&((char *) ctx->buffer)[bytes], fillbuf, (size - 2) * 4 - bytes);
121
122 /* Process last bytes. */
123 MHD_md5_process_block (ctx->buffer, size * 4, ctx);
124
125 return MHD_md5_read_ctx (ctx, resbuf);
126}
127
128/* Compute MD5 message digest for bytes read from STREAM. The
129 resulting message digest number will be written into the 16 bytes
130 beginning at RESBLOCK. */
131int
132MHD_md5_stream (FILE * stream, void *resblock)
133{
134 struct MHD_md5_ctx ctx;
135 char buffer[BLOCKSIZE + 72];
136 size_t sum;
137
138 /* Initialize the computation context. */
139 MHD_md5_init_ctx (&ctx);
140
141 /* Iterate over full file contents. */
142 while (1)
143 {
144 /* We read the file in blocks of BLOCKSIZE bytes. One call of the
145 computation function processes the whole buffer so that with the
146 next round of the loop another block can be read. */
147 size_t n;
148 sum = 0;
149
150 /* Read block. Take care for partial reads. */
151 while (1)
152 {
153 n = fread (buffer + sum, 1, BLOCKSIZE - sum, stream);
154
155 sum += n;
156
157 if (sum == BLOCKSIZE)
158 break;
159
160 if (n == 0)
161 {
162 /* Check for the error flag IFF N == 0, so that we don't
163 exit the loop after a partial read due to e.g., EAGAIN
164 or EWOULDBLOCK. */
165 if (ferror (stream))
166 return 1;
167 goto process_partial_block;
168 }
169
170 /* We've read at least one byte, so ignore errors. But always
171 check for EOF, since feof may be true even though N > 0.
172 Otherwise, we could end up calling fread after EOF. */
173 if (feof (stream))
174 goto process_partial_block;
175 }
176
177 /* Process buffer with BLOCKSIZE bytes. Note that
178 BLOCKSIZE % 64 == 0
179 */
180 MHD_md5_process_block (buffer, BLOCKSIZE, &ctx);
181 }
182
183process_partial_block:
184
185 /* Process any remaining bytes. */
186 if (sum > 0)
187 MHD_md5_process_bytes (buffer, sum, &ctx);
188
189 /* Construct result in desired memory. */
190 MHD_md5_finish_ctx (&ctx, resblock);
191 return 0;
192}
193
194/* Compute MD5 message digest for LEN bytes beginning at BUFFER. The
195 result is always in little endian byte order, so that a byte-wise
196 output yields to the wanted ASCII representation of the message
197 digest. */
198void *
199MHD_md5_buffer (const char *buffer, size_t len, void *resblock)
200{
201 struct MHD_md5_ctx ctx;
202
203 /* Initialize the computation context. */
204 MHD_md5_init_ctx (&ctx);
205
206 /* Process whole buffer but last len % 64 bytes. */
207 MHD_md5_process_bytes (buffer, len, &ctx);
208
209 /* Put result in desired memory area. */
210 return MHD_md5_finish_ctx (&ctx, resblock);
211}
212
213
214void
215MHD_md5_process_bytes (const void *buffer, size_t len,
216 struct MHD_md5_ctx *ctx)
217{
218 /* When we already have some bits in our internal buffer concatenate
219 both inputs first. */
220 if (ctx->buflen != 0)
221 {
222 size_t left_over = ctx->buflen;
223 size_t add = 128 - left_over > len ? len : 128 - left_over;
224
225 memcpy (&((char *) ctx->buffer)[left_over], buffer, add);
226 ctx->buflen += add;
227
228 if (ctx->buflen > 64)
229 {
230 MHD_md5_process_block (ctx->buffer, ctx->buflen & ~63, ctx);
231
232 ctx->buflen &= 63;
233 /* The regions in the following copy operation cannot overlap. */
234 memcpy (ctx->buffer,
235 &((char *) ctx->buffer)[(left_over + add) & ~63],
236 ctx->buflen);
237 }
238
239 buffer = (const char *) buffer + add;
240 len -= add;
241 }
242
243 /* Process available complete blocks. */
244 if (len >= 64)
245 {
246#if !_STRING_ARCH_unaligned
247# define alignof(type) offsetof (struct { char c; type x; }, x)
248# define UNALIGNED_P(p) (((size_t) p) % alignof (uint32_t) != 0)
249 if (UNALIGNED_P (buffer))
250 while (len > 64)
251 {
252 MHD_md5_process_block (memcpy (ctx->buffer, buffer, 64), 64, ctx);
253 buffer = (const char *) buffer + 64;
254 len -= 64;
255 }
256 else
257#endif
258 {
259 MHD_md5_process_block (buffer, len & ~63, ctx);
260 buffer = (const char *) buffer + (len & ~63);
261 len &= 63;
262 }
263 }
264
265 /* Move remaining bytes in internal buffer. */
266 if (len > 0)
267 {
268 size_t left_over = ctx->buflen;
269
270 memcpy (&((char *) ctx->buffer)[left_over], buffer, len);
271 left_over += len;
272 if (left_over >= 64)
273 {
274 MHD_md5_process_block (ctx->buffer, 64, ctx);
275 left_over -= 64;
276 memcpy (ctx->buffer, &ctx->buffer[16], left_over);
277 }
278 ctx->buflen = left_over;
279 }
280}
281
282
283/* These are the four functions used in the four steps of the MD5 algorithm
284 and defined in the RFC 1321. The first function is a little bit optimized
285 (as found in Colin Plumbs public domain implementation). */
286/* #define FF(b, c, d) ((b & c) | (~b & d)) */
287#define FF(b, c, d) (d ^ (b & (c ^ d)))
288#define FG(b, c, d) FF (d, b, c)
289#define FH(b, c, d) (b ^ c ^ d)
290#define FI(b, c, d) (c ^ (b | ~d))
291
292/* Process LEN bytes of BUFFER, accumulating context into CTX.
293 It is assumed that LEN % 64 == 0. */
294
295void
296MHD_md5_process_block (const void *buffer, size_t len,
297 struct MHD_md5_ctx *ctx)
298{
299 uint32_t correct_words[16];
300 const uint32_t *words = buffer;
301 size_t nwords = len / sizeof (uint32_t);
302 const uint32_t *endp = words + nwords;
303 uint32_t A = ctx->A;
304 uint32_t B = ctx->B;
305 uint32_t C = ctx->C;
306 uint32_t D = ctx->D;
307
308 /* First increment the byte count. RFC 1321 specifies the possible
309 length of the file up to 2^64 bits. Here we only compute the
310 number of bytes. Do a double word increment. */
311 ctx->total[0] += len;
312 if (ctx->total[0] < len)
313 ++ctx->total[1];
314
315 /* Process all bytes in the buffer with 64 bytes in each round of
316 the loop. */
317 while (words < endp)
318 {
319 uint32_t *cwp = correct_words;
320 uint32_t A_save = A;
321 uint32_t B_save = B;
322 uint32_t C_save = C;
323 uint32_t D_save = D;
324
325 /* First round: using the given function, the context and a constant
326 the next context is computed. Because the algorithms processing
327 unit is a 32-bit word and it is determined to work on words in
328 little endian byte order we perhaps have to change the byte order
329 before the computation. To reduce the work for the next steps
330 we store the swapped words in the array CORRECT_WORDS. */
331
332#define OP(a, b, c, d, s, T) \
333 do \
334 { \
335 a += FF (b, c, d) + (*cwp++ = SWAP (*words)) + T; \
336 ++words; \
337 CYCLIC (a, s); \
338 a += b; \
339 } \
340 while (0)
341
342 /* It is unfortunate that C does not provide an operator for
343 cyclic rotation. Hope the C compiler is smart enough. */
344#define CYCLIC(w, s) (w = (w << s) | (w >> (32 - s)))
345
346 /* Before we start, one word to the strange constants.
347 They are defined in RFC 1321 as
348
349 T[i] = (int) (4294967296.0 * fabs (sin (i))), i=1..64
350
351 Here is an equivalent invocation using Perl:
352
353 perl -e 'foreach(1..64){printf "0x%08x\n", int (4294967296 * abs (sin $_))}'
354 */
355
356 /* Round 1. */
357 OP (A, B, C, D, 7, 0xd76aa478);
358 OP (D, A, B, C, 12, 0xe8c7b756);
359 OP (C, D, A, B, 17, 0x242070db);
360 OP (B, C, D, A, 22, 0xc1bdceee);
361 OP (A, B, C, D, 7, 0xf57c0faf);
362 OP (D, A, B, C, 12, 0x4787c62a);
363 OP (C, D, A, B, 17, 0xa8304613);
364 OP (B, C, D, A, 22, 0xfd469501);
365 OP (A, B, C, D, 7, 0x698098d8);
366 OP (D, A, B, C, 12, 0x8b44f7af);
367 OP (C, D, A, B, 17, 0xffff5bb1);
368 OP (B, C, D, A, 22, 0x895cd7be);
369 OP (A, B, C, D, 7, 0x6b901122);
370 OP (D, A, B, C, 12, 0xfd987193);
371 OP (C, D, A, B, 17, 0xa679438e);
372 OP (B, C, D, A, 22, 0x49b40821);
373
374 /* For the second to fourth round we have the possibly swapped words
375 in CORRECT_WORDS. Redefine the macro to take an additional first
376 argument specifying the function to use. */
377#undef OP
378#define OP(f, a, b, c, d, k, s, T) \
379 do \
380 { \
381 a += f (b, c, d) + correct_words[k] + T; \
382 CYCLIC (a, s); \
383 a += b; \
384 } \
385 while (0)
386
387 /* Round 2. */
388 OP (FG, A, B, C, D, 1, 5, 0xf61e2562);
389 OP (FG, D, A, B, C, 6, 9, 0xc040b340);
390 OP (FG, C, D, A, B, 11, 14, 0x265e5a51);
391 OP (FG, B, C, D, A, 0, 20, 0xe9b6c7aa);
392 OP (FG, A, B, C, D, 5, 5, 0xd62f105d);
393 OP (FG, D, A, B, C, 10, 9, 0x02441453);
394 OP (FG, C, D, A, B, 15, 14, 0xd8a1e681);
395 OP (FG, B, C, D, A, 4, 20, 0xe7d3fbc8);
396 OP (FG, A, B, C, D, 9, 5, 0x21e1cde6);
397 OP (FG, D, A, B, C, 14, 9, 0xc33707d6);
398 OP (FG, C, D, A, B, 3, 14, 0xf4d50d87);
399 OP (FG, B, C, D, A, 8, 20, 0x455a14ed);
400 OP (FG, A, B, C, D, 13, 5, 0xa9e3e905);
401 OP (FG, D, A, B, C, 2, 9, 0xfcefa3f8);
402 OP (FG, C, D, A, B, 7, 14, 0x676f02d9);
403 OP (FG, B, C, D, A, 12, 20, 0x8d2a4c8a);
404
405 /* Round 3. */
406 OP (FH, A, B, C, D, 5, 4, 0xfffa3942);
407 OP (FH, D, A, B, C, 8, 11, 0x8771f681);
408 OP (FH, C, D, A, B, 11, 16, 0x6d9d6122);
409 OP (FH, B, C, D, A, 14, 23, 0xfde5380c);
410 OP (FH, A, B, C, D, 1, 4, 0xa4beea44);
411 OP (FH, D, A, B, C, 4, 11, 0x4bdecfa9);
412 OP (FH, C, D, A, B, 7, 16, 0xf6bb4b60);
413 OP (FH, B, C, D, A, 10, 23, 0xbebfbc70);
414 OP (FH, A, B, C, D, 13, 4, 0x289b7ec6);
415 OP (FH, D, A, B, C, 0, 11, 0xeaa127fa);
416 OP (FH, C, D, A, B, 3, 16, 0xd4ef3085);
417 OP (FH, B, C, D, A, 6, 23, 0x04881d05);
418 OP (FH, A, B, C, D, 9, 4, 0xd9d4d039);
419 OP (FH, D, A, B, C, 12, 11, 0xe6db99e5);
420 OP (FH, C, D, A, B, 15, 16, 0x1fa27cf8);
421 OP (FH, B, C, D, A, 2, 23, 0xc4ac5665);
422
423 /* Round 4. */
424 OP (FI, A, B, C, D, 0, 6, 0xf4292244);
425 OP (FI, D, A, B, C, 7, 10, 0x432aff97);
426 OP (FI, C, D, A, B, 14, 15, 0xab9423a7);
427 OP (FI, B, C, D, A, 5, 21, 0xfc93a039);
428 OP (FI, A, B, C, D, 12, 6, 0x655b59c3);
429 OP (FI, D, A, B, C, 3, 10, 0x8f0ccc92);
430 OP (FI, C, D, A, B, 10, 15, 0xffeff47d);
431 OP (FI, B, C, D, A, 1, 21, 0x85845dd1);
432 OP (FI, A, B, C, D, 8, 6, 0x6fa87e4f);
433 OP (FI, D, A, B, C, 15, 10, 0xfe2ce6e0);
434 OP (FI, C, D, A, B, 6, 15, 0xa3014314);
435 OP (FI, B, C, D, A, 13, 21, 0x4e0811a1);
436 OP (FI, A, B, C, D, 4, 6, 0xf7537e82);
437 OP (FI, D, A, B, C, 11, 10, 0xbd3af235);
438 OP (FI, C, D, A, B, 2, 15, 0x2ad7d2bb);
439 OP (FI, B, C, D, A, 9, 21, 0xeb86d391);
440
441 /* Add the starting values of the context. */
442 A += A_save;
443 B += B_save;
444 C += C_save;
445 D += D_save;
446 }
447
448 /* Put checksum in context given as argument. */
449 ctx->A = A;
450 ctx->B = B;
451 ctx->C = C;
452 ctx->D = D;
453}