const

[ffmpeg] / libavutil / md5.c

diff --git a/libavutil/md5.c b/libavutil/md5.c
index 1f100de35adf71154332e392c0f138326c0b6a2c..ee39de1318342c00d14712624c2ac4a135803193 100644 (file)
--- a/libavutil/md5.c
+++ b/libavutil/md5.c
@@ -2,6 +2,17 @@
  * Copyright (C) 2006 Michael Niedermayer (michaelni@gmx.at)
  * Copyright (C) 2003-2005 by Christopher R. Hertel (crh@ubiqx.mn.org)
  *
+ * 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@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 recommended.
+ *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
@@ -17,17 +28,6 @@
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
- * 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@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 recommended
  */
 
 #include "common.h"
@@ -35,9 +35,9 @@
 #include "md5.h"
 
 typedef struct AVMD5{
+    uint64_t len;
     uint8_t  block[64];
     uint32_t ABCD[4];
-    uint64_t len;
 } AVMD5;
 
 const int av_md5_size= sizeof(AVMD5);
@@ -49,7 +49,7 @@ static const uint8_t S[4][4] = {
     { 6, 10, 15, 21 }   /* Round 4 */
 };
 
-static const uint32_t T[64] = {
+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,
@@ -75,18 +75,19 @@ static const uint32_t T[64] = {
         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;\
+        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) ));
 
 static void body(uint32_t ABCD[4], uint32_t X[16]){
 
     int t;
-    int i attribute_unused;
+    int i av_unused;
     unsigned int a= ABCD[3];
     unsigned int b= ABCD[2];
     unsigned int c= ABCD[1];
@@ -146,7 +147,7 @@ void av_md5_final(AVMD5 *ctx, uint8_t *dst){
     while((ctx->len & 63)<56)
         av_md5_update(ctx, "", 1);
 
-    av_md5_update(ctx, &finalcount, 8);
+    av_md5_update(ctx, (uint8_t*)&finalcount, 8);
 
     for(i=0; i<4; i++)
         ((uint32_t*)dst)[i]= le2me_32(ctx->ABCD[3-i]);
@@ -162,7 +163,8 @@ void av_md5_sum(uint8_t *dst, const uint8_t *src, const int len){
 
 #ifdef TEST
 #include <stdio.h>
-main(){
+#undef printf
+int main(void){
     uint64_t md5val;
     int i;
     uint8_t in[1000];
@@ -174,5 +176,7 @@ main(){
     av_md5_sum( (uint8_t*)&md5val, in,  65); printf("%"PRId64"\n", md5val);
     for(i=0; i<1000; i++) in[i]= i % 127;
     av_md5_sum( (uint8_t*)&md5val, in,  999); printf("%"PRId64"\n", md5val);
+
+    return 0;
 }
 #endif