[Ffmpeg-cvslog] r5565 - in trunk/libavutil: md5.c md5.h
michael
subversion
Sat Jul 1 12:02:08 CEST 2006
Author: michael
Date: Sat Jul 1 12:02:08 2006
New Revision: 5565
Added:
trunk/libavutil/md5.c
trunk/libavutil/md5.h
Log:
md5 support
depending on CONFIG_SMALL this can either be compiled to a fully unrolled kernel / rfc reference style md5 routine
or a single loop similar to what mplayer uses
Added: trunk/libavutil/md5.c
==============================================================================
--- (empty file)
+++ trunk/libavutil/md5.c Sat Jul 1 12:02:08 2006
@@ -0,0 +1,170 @@
+/*
+ * Copyright (C) 2006 Michael Niedermayer (michaelni at gmx.at)
+ * Copyright (C) 2003-2005 by Christopher R. Hertel (crh at ubiqx.mn.org)
+ * #inlcude LGPL license
+ *
+ * References:
+ * IETF RFC 1321: The MD5 Message-Digest Algorithm
+ * Ron Rivest. IETF, April, 1992
+ *
+ * based on http://ubiqx.org/libcifs/source/Auth/MD5.c
+ * from Christopher R. Hertel (crh at ubiqx.mn.org)
+ * 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 recommanded
+ */
+
+#include "common.h"
+#include <string.h>
+#include "md5.h"
+
+typedef struct AVMD5{
+ uint8_t block[64];
+ uint32_t ABCD[4];
+ uint64_t len;
+ int b_used;
+} AVMD5;
+
+const int av_md5_size= sizeof(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 */
+};
+
+static const uint32_t T[64] = {
+ 0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, /* Round 1 */
+ 0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
+ 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
+ 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
+
+ 0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, /* Round 2 */
+ 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
+ 0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
+ 0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
+
+ 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, /* Round 3 */
+ 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
+ 0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05,
+ 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
+
+ 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], const uint32_t X[16]){
+ int i, t;
+ 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]);
+#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;
+ }
+#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)
+#endif
+
+ ABCD[0] += d;
+ ABCD[1] += c;
+ ABCD[2] += b;
+ ABCD[3] += a;
+}
+
+void av_md5_init(AVMD5 *ctx){
+ ctx->len = 0;
+ ctx->b_used = 0;
+
+ ctx->ABCD[0] = 0x10325476;
+ ctx->ABCD[1] = 0x98badcfe;
+ ctx->ABCD[2] = 0xefcdab89;
+ ctx->ABCD[3] = 0x67452301;
+}
+
+void av_md5_update(AVMD5 *ctx, const uint8_t *src, const int len){
+ int i;
+
+ ctx->len += len;
+
+ for( i = 0; i < len; i++ ){
+ ctx->block[ ctx->b_used++ ] = src[i];
+ if( 64 == ctx->b_used ){
+ body(ctx->ABCD, ctx->block);
+ ctx->b_used = 0;
+ }
+ }
+}
+
+void av_md5_final(AVMD5 *ctx, uint8_t *dst){
+ int i;
+
+ 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, ctx->block );
+ memset(ctx->block, 0, 64);
+ }
+
+ for(i=0; i<8; i++)
+ ctx->block[56+i] = (ctx->len << 3) >> (i<<3);
+
+ body(ctx->ABCD, ctx->block);
+
+#define le2me_32(a) a
+ for(i=0; i<4; i++)
+ ((uint32_t*)dst)[i]= le2me_32(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);
+}
+
+#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);
+}
+#endif
Added: trunk/libavutil/md5.h
==============================================================================
--- (empty file)
+++ trunk/libavutil/md5.h Sat Jul 1 12:02:08 2006
@@ -0,0 +1,13 @@
+#ifndef MD5_H
+#define MD5_H
+
+extern const av_md5_size;
+
+struct AVMD5;
+
+void av_md5_init(struct AVMD5 *ctx);
+void av_md5_update(struct AVMD5 *ctx, const uint8_t *src, const int len);
+void av_md5_final(struct AVMD5 *ctx, uint8_t *dst);
+
+#endif /* MD5_H */
+
More information about the ffmpeg-cvslog
mailing list