/*
* Copyright (C) 2006 Michael Niedermayer (michaelni@gmx.at)
* Copyright (C) 2003-2005 by Christopher R. Hertel (crh@ubiqx.mn.org)
- * #inlcude LGPL license
*
* References:
* IETF RFC 1321: The MD5 Message-Digest Algorithm
*
* based on http://ubiqx.org/libcifs/source/Auth/MD5.c
* from Christopher R. Hertel (crh@ubiqx.mn.org)
- * simplified, cleaned and IMO redundant comments removed by michael
+ * Simplified, cleaned and IMO redundant comments removed by Michael.
*
- * if you use gcc, then version 4.1 or later and -fomit-frame-pointer is
- * strongly recommended
+ * If you use gcc, then version 4.1 or later and -fomit-frame-pointer is
+ * strongly recommended.
+ *
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#include "common.h"
-#include <string.h>
+#include <stdint.h>
+
+#include "bswap.h"
+#include "intreadwrite.h"
+#include "mem.h"
#include "md5.h"
-typedef struct AVMD5{
+typedef struct AVMD5 {
+ uint64_t len;
uint8_t block[64];
uint32_t ABCD[4];
- uint64_t len;
- int b_used;
} AVMD5;
-const int av_md5_size= sizeof(AVMD5);
+struct AVMD5 *av_md5_alloc(void)
+{
+ return av_mallocz(sizeof(struct AVMD5));
+}
static const uint8_t S[4][4] = {
- { 7, 12, 17, 22 }, /* Round 1 */
- { 5, 9, 14, 20 }, /* Round 2 */
- { 4, 11, 16, 23 }, /* Round 3 */
- { 6, 10, 15, 21 } /* Round 4 */
+ { 7, 12, 17, 22 }, /* round 1 */
+ { 5, 9, 14, 20 }, /* round 2 */
+ { 4, 11, 16, 23 }, /* round 3 */
+ { 6, 10, 15, 21 } /* round 4 */
};
-static const uint32_t T[64] = {
- 0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, /* Round 1 */
+static const uint32_t T[64] = { // T[i]= fabs(sin(i+1)<<32)
+ 0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, /* round 1 */
0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
- 0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, /* Round 2 */
+ 0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, /* round 2 */
0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
- 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, /* Round 3 */
+ 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, /* round 3 */
0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05,
0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
- 0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, /* Round 4 */
+ 0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, /* round 4 */
0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391,
};
-#define CORE(i, a, b, c, d) \
- t = S[i>>4][i&3];\
- a += T[i];\
-\
- switch(i>>4){\
- case 0: a += (d ^ (b&(c^d))) + X[ i &15 ]; break;\
- case 1: a += (c ^ (d&(c^b))) + X[ (1+5*i)&15 ]; break;\
- case 2: a += (b^c^d) + X[ (5+3*i)&15 ]; break;\
- case 3: a += (c^(b|~d)) + X[ ( 7*i)&15 ]; break;\
- }\
- a = b + (( a << t ) | ( a >> (32 - t) ));
-
-static void body(uint32_t ABCD[4], uint32_t X[16]){
-
+#define CORE(i, a, b, c, d) \
+ do { \
+ t = S[i >> 4][i & 3]; \
+ a += T[i]; \
+ \
+ if (i < 32) { \
+ if (i < 16) \
+ a += (d ^ (b & (c ^ d))) + X[i & 15]; \
+ else \
+ a += (c ^ (d & (c ^ b))) + X[(1 + 5 * i) & 15]; \
+ } else { \
+ if (i < 48) \
+ a += (b ^ c ^ d) + X[(5 + 3 * i) & 15]; \
+ else \
+ a += (c ^ (b | ~d)) + X[(7 * i) & 15]; \
+ } \
+ a = b + (a << t | a >> (32 - t)); \
+ } while (0)
+
+static void body(uint32_t ABCD[4], uint32_t X[16])
+{
int t;
- int i attribute_unused;
- unsigned int a= ABCD[3];
- unsigned int b= ABCD[2];
- unsigned int c= ABCD[1];
- unsigned int d= ABCD[0];
-
-#ifdef WORDS_BIGENDIAN
- for(i=0; i<16; i++)
- X[i]= bswap_32(X[i]);
+ int i av_unused;
+ unsigned int a = ABCD[3];
+ unsigned int b = ABCD[2];
+ unsigned int c = ABCD[1];
+ unsigned int d = ABCD[0];
+
+#if HAVE_BIGENDIAN
+ for (i = 0; i < 16; i++)
+ X[i] = av_bswap32(X[i]);
#endif
-#ifdef CONFIG_SMALL
- for( i = 0; i < 64; i++ ){
- CORE(i,a,b,c,d)
- t=d; d=c; c=b; b=a; a=t;
+#if CONFIG_SMALL
+ for (i = 0; i < 64; i++) {
+ CORE(i, a, b, c, d);
+ t = d;
+ d = c;
+ c = b;
+ b = a;
+ a = t;
}
#else
-#define CORE2(i) CORE(i,a,b,c,d) CORE((i+1),d,a,b,c) CORE((i+2),c,d,a,b) CORE((i+3),b,c,d,a)
-#define CORE4(i) CORE2(i) CORE2((i+4)) CORE2((i+8)) CORE2((i+12))
-CORE4(0) CORE4(16) CORE4(32) CORE4(48)
+#define CORE2(i) \
+ CORE(i, a, b, c, d); CORE((i + 1), d, a, b, c); \
+ CORE((i + 2), c, d, a, b); CORE((i + 3), b, c, d, a)
+#define CORE4(i) CORE2(i); CORE2((i + 4)); CORE2((i + 8)); CORE2((i + 12))
+ CORE4(0);
+ CORE4(16);
+ CORE4(32);
+ CORE4(48);
#endif
ABCD[0] += d;
ABCD[3] += a;
}
-void av_md5_init(AVMD5 *ctx){
- ctx->len = 0;
- ctx->b_used = 0;
+void av_md5_init(AVMD5 *ctx)
+{
+ ctx->len = 0;
ctx->ABCD[0] = 0x10325476;
ctx->ABCD[1] = 0x98badcfe;
ctx->ABCD[3] = 0x67452301;
}
-void av_md5_update(AVMD5 *ctx, const uint8_t *src, const int len){
- int i;
+#if FF_API_CRYPTO_SIZE_T
+void av_md5_update(AVMD5 *ctx, const uint8_t *src, const int len)
+#else
+void av_md5_update(AVMD5 *ctx, const uint8_t *src, size_t len)
+#endif
+{
+ int i, j;
+ j = ctx->len & 63;
ctx->len += len;
- for( i = 0; i < len; i++ ){
- ctx->block[ ctx->b_used++ ] = src[i];
- if( 64 == ctx->b_used ){
- body(ctx->ABCD, (uint32_t*) ctx->block);
- ctx->b_used = 0;
+ for (i = 0; i < len; i++) {
+ ctx->block[j++] = src[i];
+ if (j == 64) {
+ body(ctx->ABCD, (uint32_t *) ctx->block);
+ j = 0;
}
}
}
-void av_md5_final(AVMD5 *ctx, uint8_t *dst){
+void av_md5_final(AVMD5 *ctx, uint8_t *dst)
+{
int i;
+ uint64_t finalcount = av_le2ne64(ctx->len << 3);
- ctx->block[ctx->b_used++] = 0x80;
-
- memset(&ctx->block[ctx->b_used], 0, 64 - ctx->b_used);
-
- if( 56 < ctx->b_used ){
- body( ctx->ABCD, (uint32_t*) ctx->block );
- memset(ctx->block, 0, 64);
- }
-
- for(i=0; i<8; i++)
- ctx->block[56+i] = (ctx->len << 3) >> (i<<3);
+ av_md5_update(ctx, "\200", 1);
+ while ((ctx->len & 63) != 56)
+ av_md5_update(ctx, "", 1);
- body(ctx->ABCD, (uint32_t*) ctx->block);
+ av_md5_update(ctx, (uint8_t *) &finalcount, 8);
- for(i=0; i<4; i++)
- ((uint32_t*)dst)[i]= le2me_32(ctx->ABCD[3-i]);
+ for (i = 0; i < 4; i++)
+ AV_WL32(dst + 4 * i, ctx->ABCD[3 - i]);
}
-void av_md5_sum(uint8_t *dst, const uint8_t *src, const int len){
- AVMD5 ctx[1];
-
- av_md5_init(ctx);
- av_md5_update(ctx, src, len);
- av_md5_final(ctx, dst);
-}
+#if FF_API_CRYPTO_SIZE_T
+void av_md5_sum(uint8_t *dst, const uint8_t *src, const int len)
+#else
+void av_md5_sum(uint8_t *dst, const uint8_t *src, size_t len)
+#endif
+{
+ AVMD5 ctx;
-#ifdef TEST
-#include <stdio.h>
-main(){
- uint64_t md5val;
- int i;
- uint8_t in[1000];
-
- for(i=0; i<1000; i++) in[i]= i*i;
- av_md5_sum( (uint8_t*)&md5val, in, 1000); printf("%lld\n", md5val);
- av_md5_sum( (uint8_t*)&md5val, in, 63); printf("%lld\n", md5val);
- av_md5_sum( (uint8_t*)&md5val, in, 64); printf("%lld\n", md5val);
- av_md5_sum( (uint8_t*)&md5val, in, 65); printf("%lld\n", md5val);
- for(i=0; i<1000; i++) in[i]= i % 127;
- av_md5_sum( (uint8_t*)&md5val, in, 999); printf("%lld\n", md5val);
+ av_md5_init(&ctx);
+ av_md5_update(&ctx, src, len);
+ av_md5_final(&ctx, dst);
}
-#endif
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