FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavutil/md5.c
Date: 2024-02-16 17:37:06
Exec Total Coverage
Lines: 57 57 100.0%
Functions: 6 6 100.0%
Branches: 12 12 100.0%

Line Branch Exec Source
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 <string.h>
35
36 #include "bswap.h"
37 #include "intreadwrite.h"
38 #include "macros.h"
39 #include "mem.h"
40 #include "md5.h"
41
42 typedef struct AVMD5 {
43 uint64_t len;
44 uint8_t block[64];
45 uint32_t ABCD[4];
46 } AVMD5;
47
48 const int av_md5_size = sizeof(AVMD5);
49
50 3477 struct AVMD5 *av_md5_alloc(void)
51 {
52 3477 return av_mallocz(sizeof(struct AVMD5));
53 }
54
55 static const uint8_t S[4][4] = {
56 { 7, 12, 17, 22 }, /* round 1 */
57 { 5, 9, 14, 20 }, /* round 2 */
58 { 4, 11, 16, 23 }, /* round 3 */
59 { 6, 10, 15, 21 } /* round 4 */
60 };
61
62 static const uint32_t T[64] = { // T[i]= fabs(sin(i+1)<<32)
63 0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, /* round 1 */
64 0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
65 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
66 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
67
68 0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, /* round 2 */
69 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
70 0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
71 0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
72
73 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, /* round 3 */
74 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
75 0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05,
76 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
77
78 0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, /* round 4 */
79 0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
80 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
81 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391,
82 };
83
84 #define CORE(i, a, b, c, d) \
85 do { \
86 t = S[i >> 4][i & 3]; \
87 a += T[i]; \
88 \
89 if (i < 32) { \
90 if (i < 16) \
91 a += (d ^ (b & (c ^ d))) + AV_RL32(X+( i & 15));\
92 else \
93 a += ((d & b) | (~d & c)) + AV_RL32(X+((1 + 5*i) & 15));\
94 } else { \
95 if (i < 48) \
96 a += (b ^ c ^ d) + AV_RL32(X+((5 + 3*i) & 15));\
97 else \
98 a += (c ^ (b | ~d)) + AV_RL32(X+(( 7*i) & 15));\
99 } \
100 a = b + (a << t | a >> (32 - t)); \
101 } while (0)
102
103 480549 static void body(uint32_t ABCD[4], const uint8_t *src, size_t nblocks)
104 {
105 const uint32_t *X;
106 uint32_t a, b, c, d, t;
107
108
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60100649 for (size_t n = 0; n < nblocks; n++) {
109 59620100 a = ABCD[3];
110 59620100 b = ABCD[2];
111 59620100 c = ABCD[1];
112 59620100 d = ABCD[0];
113
114 59620100 X = (const uint32_t *)src + n * 16;
115
116 #if CONFIG_SMALL
117 for (int 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 59620100 CORE4(0);
131 59620100 CORE4(16);
132 59620100 CORE4(32);
133 59620100 CORE4(48);
134 #endif
135
136 59620100 ABCD[0] += d;
137 59620100 ABCD[1] += c;
138 59620100 ABCD[2] += b;
139 59620100 ABCD[3] += a;
140 }
141 480549 }
142
143 13416 void av_md5_init(AVMD5 *ctx)
144 {
145 13416 ctx->len = 0;
146
147 13416 ctx->ABCD[0] = 0x10325476;
148 13416 ctx->ABCD[1] = 0x98badcfe;
149 13416 ctx->ABCD[2] = 0xefcdab89;
150 13416 ctx->ABCD[3] = 0x67452301;
151 13416 }
152
153 864515 void av_md5_update(AVMD5 *ctx, const uint8_t *src, size_t len)
154 {
155 const uint8_t *end;
156 int j;
157
158 864515 j = ctx->len & 63;
159 864515 ctx->len += len;
160
161
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864515 if (j) {
162 764826 int cnt = FFMIN(len, 64 - j);
163 764826 memcpy(ctx->block + j, src, cnt);
164 764826 src += cnt;
165 764826 len -= cnt;
166
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764826 if (j + cnt < 64)
167 574396 return;
168 190430 body(ctx->ABCD, ctx->block, 1);
169 }
170
171 290119 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 290119 size_t nblocks = len / 64;
180 290119 body(ctx->ABCD, src, nblocks);
181 290119 src = end;
182 }
183 290119 len &= 63;
184
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290119 if (len > 0)
185 190442 memcpy(ctx->block, src, len);
186 }
187
188 13435 void av_md5_final(AVMD5 *ctx, uint8_t *dst)
189 {
190 int i;
191 13435 uint64_t finalcount = av_le2ne64(ctx->len << 3);
192
193 13435 av_md5_update(ctx, "\200", 1);
194
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578856 while ((ctx->len & 63) != 56)
195 565421 av_md5_update(ctx, "", 1);
196
197 13435 av_md5_update(ctx, (uint8_t *) &finalcount, 8);
198
199
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67175 for (i = 0; i < 4; i++)
200 53740 AV_WL32(dst + 4 * i, ctx->ABCD[3 - i]);
201 13435 }
202
203 4611 void av_md5_sum(uint8_t *dst, const uint8_t *src, size_t len)
204 {
205 AVMD5 ctx;
206
207 4611 av_md5_init(&ctx);
208 4611 av_md5_update(&ctx, src, len);
209 4611 av_md5_final(&ctx, dst);
210 4611 }
211