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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 #include "bswap.h"
35 #include "intreadwrite.h"
36 #include "md5.h"
37 #include "mem.h"
38 
39 typedef struct AVMD5{
40  uint64_t len;
42  uint32_t ABCD[4];
43 } AVMD5;
44 
45 const int av_md5_size = sizeof(AVMD5);
46 
47 struct AVMD5 *av_md5_alloc(void)
48 {
49  return av_mallocz(sizeof(struct AVMD5));
50 }
51 
52 static const uint8_t S[4][4] = {
53  { 7, 12, 17, 22 }, /* round 1 */
54  { 5, 9, 14, 20 }, /* round 2 */
55  { 4, 11, 16, 23 }, /* round 3 */
56  { 6, 10, 15, 21 } /* round 4 */
57 };
58 
59 static const uint32_t T[64] = { // T[i]= fabs(sin(i+1)<<32)
60  0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, /* round 1 */
61  0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
62  0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
63  0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
64 
65  0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, /* round 2 */
66  0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
67  0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
68  0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
69 
70  0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, /* round 3 */
71  0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
72  0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05,
73  0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
74 
75  0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, /* round 4 */
76  0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
77  0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
78  0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391,
79 };
80 
81 #define CORE(i, a, b, c, d) do { \
82  t = S[i >> 4][i & 3]; \
83  a += T[i]; \
84  \
85  if (i < 32) { \
86  if (i < 16) a += (d ^ (b & (c ^ d))) + X[ i & 15]; \
87  else a += ((d & b) | (~d & c)) + X[(1 + 5*i) & 15]; \
88  } else { \
89  if (i < 48) a += (b ^ c ^ d) + X[(5 + 3*i) & 15]; \
90  else a += (c ^ (b | ~d)) + X[( 7*i) & 15]; \
91  } \
92  a = b + (a << t | a >> (32 - t)); \
93  } while (0)
94 
95 static void body(uint32_t ABCD[4], uint32_t *src, int nblocks)
96 {
97  int i av_unused;
98  int n;
99  uint32_t a, b, c, d, t, *X;
100 
101  for (n = 0; n < nblocks; n++) {
102  a = ABCD[3];
103  b = ABCD[2];
104  c = ABCD[1];
105  d = ABCD[0];
106 
107  X = src + n * 16;
108 
109 #if HAVE_BIGENDIAN
110  for (i = 0; i < 16; i++)
111  X[i] = av_bswap32(X[i]);
112 #endif
113 
114 #if CONFIG_SMALL
115  for (i = 0; i < 64; i++) {
116  CORE(i, a, b, c, d);
117  t = d;
118  d = c;
119  c = b;
120  b = a;
121  a = t;
122  }
123 #else
124 #define CORE2(i) \
125  CORE( i, a,b,c,d); CORE((i+1),d,a,b,c); \
126  CORE((i+2),c,d,a,b); CORE((i+3),b,c,d,a)
127 #define CORE4(i) CORE2(i); CORE2((i+4)); CORE2((i+8)); CORE2((i+12))
128  CORE4(0); CORE4(16); CORE4(32); CORE4(48);
129 #endif
130 
131  ABCD[0] += d;
132  ABCD[1] += c;
133  ABCD[2] += b;
134  ABCD[3] += a;
135  }
136 }
137 
139 {
140  ctx->len = 0;
141 
142  ctx->ABCD[0] = 0x10325476;
143  ctx->ABCD[1] = 0x98badcfe;
144  ctx->ABCD[2] = 0xefcdab89;
145  ctx->ABCD[3] = 0x67452301;
146 }
147 
148 void av_md5_update(AVMD5 *ctx, const uint8_t *src, int len)
149 {
150  const uint8_t *end;
151  int j;
152 
153  j = ctx->len & 63;
154  ctx->len += len;
155 
156  if (j) {
157  int cnt = FFMIN(len, 64 - j);
158  memcpy(ctx->block + j, src, cnt);
159  src += cnt;
160  len -= cnt;
161  if (j + cnt < 64)
162  return;
163  body(ctx->ABCD, (uint32_t *)ctx->block, 1);
164  }
165 
166  end = src + (len & ~63);
167  if (HAVE_BIGENDIAN || (!HAVE_FAST_UNALIGNED && ((intptr_t)src & 3))) {
168  while (src < end) {
169  memcpy(ctx->block, src, 64);
170  body(ctx->ABCD, (uint32_t *) ctx->block, 1);
171  src += 64;
172  }
173  } else {
174  int nblocks = len / 64;
175  body(ctx->ABCD, (uint32_t *)src, nblocks);
176  src = end;
177  }
178  len &= 63;
179  if (len > 0)
180  memcpy(ctx->block, src, len);
181 }
182 
184 {
185  int i;
186  uint64_t finalcount = av_le2ne64(ctx->len << 3);
187 
188  av_md5_update(ctx, "\200", 1);
189  while ((ctx->len & 63) != 56)
190  av_md5_update(ctx, "", 1);
191 
192  av_md5_update(ctx, (uint8_t *)&finalcount, 8);
193 
194  for (i = 0; i < 4; i++)
195  AV_WL32(dst + 4*i, ctx->ABCD[3 - i]);
196 }
197 
198 void av_md5_sum(uint8_t *dst, const uint8_t *src, const int len)
199 {
200  AVMD5 ctx;
201 
202  av_md5_init(&ctx);
203  av_md5_update(&ctx, src, len);
204  av_md5_final(&ctx, dst);
205 }
206 
207 #ifdef TEST
208 #include <stdio.h>
209 
210 static void print_md5(uint8_t *md5)
211 {
212  int i;
213  for (i = 0; i < 16; i++)
214  printf("%02x", md5[i]);
215  printf("\n");
216 }
217 
218 int main(void){
219  uint8_t md5val[16];
220  int i;
221  volatile uint8_t in[1000]; // volatile to workaround http://llvm.org/bugs/show_bug.cgi?id=20849
222  // FIXME remove volatile once it has been fixed and all fate clients are updated
223 
224  for (i = 0; i < 1000; i++)
225  in[i] = i * i;
226  av_md5_sum(md5val, in, 1000); print_md5(md5val);
227  av_md5_sum(md5val, in, 63); print_md5(md5val);
228  av_md5_sum(md5val, in, 64); print_md5(md5val);
229  av_md5_sum(md5val, in, 65); print_md5(md5val);
230  for (i = 0; i < 1000; i++)
231  in[i] = i % 127;
232  av_md5_sum(md5val, in, 999); print_md5(md5val);
233 
234  return 0;
235 }
236 #endif
static const uint32_t T[64]
Definition: md5.c:59
static const uint8_t S[4][4]
Definition: md5.c:52
AVFormatContext * ctx
Definition: movenc-test.c:48
memory handling functions
const char * b
Definition: vf_curves.c:109
void av_md5_update(AVMD5 *ctx, const uint8_t *src, int len)
Update hash value.
Definition: md5.c:148
struct AVMD5 * av_md5_alloc(void)
Allocate an AVMD5 context.
Definition: md5.c:47
uint8_t
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
const int av_md5_size
Definition: md5.c:45
static void print_md5(void *log_ctx, int level, uint8_t md5[16])
Definition: hevc.c:2837
void av_md5_sum(uint8_t *dst, const uint8_t *src, const int len)
Hash an array of data.
Definition: md5.c:198
Definition: md5.c:39
static void body(uint32_t ABCD[4], uint32_t *src, int nblocks)
Definition: md5.c:95
#define FFMIN(a, b)
Definition: common.h:96
uint8_t block[64]
Definition: md5.c:41
int n
Definition: avisynth_c.h:547
#define src
Definition: vp9dsp.c:530
#define CORE4(i)
#define av_bswap32
Definition: bswap.h:33
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> in
void av_md5_init(AVMD5 *ctx)
Initialize MD5 hashing.
Definition: md5.c:138
uint64_t len
Definition: md5.c:40
#define av_le2ne64(x)
Definition: bswap.h:97
byte swapping routines
#define CORE(i, a, b, c, d)
Definition: md5.c:81
void av_md5_final(AVMD5 *ctx, uint8_t *dst)
Finish hashing and output digest value.
Definition: md5.c:183
uint32_t ABCD[4]
Definition: md5.c:42
static double c[64]
struct AVMD5 * md5
Definition: movenc-test.c:56
int len
int main(int argc, char **argv)
Definition: main.c:22
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:252
#define av_unused
Definition: attributes.h:126
#define AV_WL32(p, v)
Definition: intreadwrite.h:426