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md5.c
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1 /*
2  * Copyright (C) 2006 Michael Niedermayer (michaelni@gmx.at)
3  * Copyright (C) 2003-2005 by Christopher R. Hertel (crh@ubiqx.mn.org)
4  *
5  * References:
6  * IETF RFC 1321: The MD5 Message-Digest Algorithm
7  * Ron Rivest. IETF, April, 1992
8  *
9  * based on http://ubiqx.org/libcifs/source/Auth/MD5.c
10  * from Christopher R. Hertel (crh@ubiqx.mn.org)
11  * Simplified, cleaned and IMO redundant comments removed by Michael.
12  *
13  * If you use gcc, then version 4.1 or later and -fomit-frame-pointer is
14  * strongly recommended.
15  *
16  * This file is part of FFmpeg.
17  *
18  * FFmpeg is free software; you can redistribute it and/or
19  * modify it under the terms of the GNU Lesser General Public
20  * License as published by the Free Software Foundation; either
21  * version 2.1 of the License, or (at your option) any later version.
22  *
23  * FFmpeg is distributed in the hope that it will be useful,
24  * but WITHOUT ANY WARRANTY; without even the implied warranty of
25  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
26  * Lesser General Public License for more details.
27  *
28  * You should have received a copy of the GNU Lesser General Public
29  * License along with FFmpeg; if not, write to the Free Software
30  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
31  */
32 
33 #include <stdint.h>
34 
35 #include "bswap.h"
36 #include "intreadwrite.h"
37 #include "mem.h"
38 #include "md5.h"
39 
40 typedef struct AVMD5 {
41  uint64_t len;
43  uint32_t ABCD[4];
44 } AVMD5;
45 
46 const int av_md5_size = sizeof(AVMD5);
47 
48 struct AVMD5 *av_md5_alloc(void)
49 {
50  return av_mallocz(sizeof(struct AVMD5));
51 }
52 
53 static const uint8_t S[4][4] = {
54  { 7, 12, 17, 22 }, /* round 1 */
55  { 5, 9, 14, 20 }, /* round 2 */
56  { 4, 11, 16, 23 }, /* round 3 */
57  { 6, 10, 15, 21 } /* round 4 */
58 };
59 
60 static const uint32_t T[64] = { // T[i]= fabs(sin(i+1)<<32)
61  0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, /* round 1 */
62  0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
63  0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
64  0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
65 
66  0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, /* round 2 */
67  0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
68  0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
69  0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
70 
71  0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, /* round 3 */
72  0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
73  0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05,
74  0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
75 
76  0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, /* round 4 */
77  0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
78  0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
79  0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391,
80 };
81 
82 #define CORE(i, a, b, c, d) \
83  do { \
84  t = S[i >> 4][i & 3]; \
85  a += T[i]; \
86  \
87  if (i < 32) { \
88  if (i < 16) \
89  a += (d ^ (b & (c ^ d))) + AV_RL32(X+( i & 15));\
90  else \
91  a += ((d & b) | (~d & c)) + AV_RL32(X+((1 + 5*i) & 15));\
92  } else { \
93  if (i < 48) \
94  a += (b ^ c ^ d) + AV_RL32(X+((5 + 3*i) & 15));\
95  else \
96  a += (c ^ (b | ~d)) + AV_RL32(X+(( 7*i) & 15));\
97  } \
98  a = b + (a << t | a >> (32 - t)); \
99  } while (0)
100 
101 static void body(uint32_t ABCD[4], const uint8_t *src, int nblocks)
102 {
103  int i av_unused;
104  int n;
105  const uint32_t *X;
106  uint32_t a, b, c, d, t;
107 
108  for (n = 0; n < nblocks; n++) {
109  a = ABCD[3];
110  b = ABCD[2];
111  c = ABCD[1];
112  d = ABCD[0];
113 
114  X = (const uint32_t *)src + n * 16;
115 
116 #if CONFIG_SMALL
117  for (i = 0; i < 64; i++) {
118  CORE(i, a, b, c, d);
119  t = d;
120  d = c;
121  c = b;
122  b = a;
123  a = t;
124  }
125 #else
126 #define CORE2(i) \
127  CORE(i, a, b, c, d); CORE((i + 1), d, a, b, c); \
128  CORE((i + 2), c, d, a, b); CORE((i + 3), b, c, d, a)
129 #define CORE4(i) CORE2(i); CORE2((i + 4)); CORE2((i + 8)); CORE2((i + 12))
130  CORE4(0);
131  CORE4(16);
132  CORE4(32);
133  CORE4(48);
134 #endif
135 
136  ABCD[0] += d;
137  ABCD[1] += c;
138  ABCD[2] += b;
139  ABCD[3] += a;
140  }
141 }
142 
144 {
145  ctx->len = 0;
146 
147  ctx->ABCD[0] = 0x10325476;
148  ctx->ABCD[1] = 0x98badcfe;
149  ctx->ABCD[2] = 0xefcdab89;
150  ctx->ABCD[3] = 0x67452301;
151 }
152 
153 void av_md5_update(AVMD5 *ctx, const uint8_t *src, int len)
154 {
155  const uint8_t *end;
156  int j;
157 
158  j = ctx->len & 63;
159  ctx->len += len;
160 
161  if (j) {
162  int cnt = FFMIN(len, 64 - j);
163  memcpy(ctx->block + j, src, cnt);
164  src += cnt;
165  len -= cnt;
166  if (j + cnt < 64)
167  return;
168  body(ctx->ABCD, ctx->block, 1);
169  }
170 
171  end = src + (len & ~63);
172  if (!HAVE_FAST_UNALIGNED && ((intptr_t)src & 3)) {
173  while (src < end) {
174  memcpy(ctx->block, src, 64);
175  body(ctx->ABCD, ctx->block, 1);
176  src += 64;
177  }
178  } else {
179  int nblocks = len / 64;
180  body(ctx->ABCD, src, nblocks);
181  src = end;
182  }
183  len &= 63;
184  if (len > 0)
185  memcpy(ctx->block, src, len);
186 }
187 
189 {
190  int i;
191  uint64_t finalcount = av_le2ne64(ctx->len << 3);
192 
193  av_md5_update(ctx, "\200", 1);
194  while ((ctx->len & 63) != 56)
195  av_md5_update(ctx, "", 1);
196 
197  av_md5_update(ctx, (uint8_t *) &finalcount, 8);
198 
199  for (i = 0; i < 4; i++)
200  AV_WL32(dst + 4 * i, ctx->ABCD[3 - i]);
201 }
202 
203 void av_md5_sum(uint8_t *dst, const uint8_t *src, const int len)
204 {
205  AVMD5 ctx;
206 
207  av_md5_init(&ctx);
208  av_md5_update(&ctx, src, len);
209  av_md5_final(&ctx, dst);
210 }
static const uint32_t T[64]
Definition: md5.c:60
static const uint8_t S[4][4]
Definition: md5.c:53
Memory handling functions.
const char * b
Definition: vf_curves.c:113
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:222
#define src
Definition: vp8dsp.c:254
void av_md5_update(AVMD5 *ctx, const uint8_t *src, int len)
Update hash value.
Definition: md5.c:153
struct AVMD5 * av_md5_alloc(void)
Allocate an AVMD5 context.
Definition: md5.c:48
uint8_t
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
const int av_md5_size
Definition: md5.c:46
void av_md5_sum(uint8_t *dst, const uint8_t *src, const int len)
Hash an array of data.
Definition: md5.c:203
Definition: md5.c:40
static void body(uint32_t ABCD[4], const uint8_t *src, int nblocks)
Definition: md5.c:101
#define FFMIN(a, b)
Definition: common.h:96
AVFormatContext * ctx
Definition: movenc.c:48
uint8_t block[64]
Definition: md5.c:42
int n
Definition: avisynth_c.h:684
#define CORE4(i)
void av_md5_init(AVMD5 *ctx)
Initialize MD5 hashing.
Definition: md5.c:143
uint64_t len
Definition: md5.c:41
#define av_le2ne64(x)
Definition: bswap.h:97
byte swapping routines
#define CORE(i, a, b, c, d)
Definition: md5.c:82
void av_md5_final(AVMD5 *ctx, uint8_t *dst)
Finish hashing and output digest value.
Definition: md5.c:188
uint32_t ABCD[4]
Definition: md5.c:43
static double c[64]
int len
Public header for MD5 hash function implementation.
#define av_unused
Definition: attributes.h:125
#define AV_WL32(p, v)
Definition: intreadwrite.h:431