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md5.cpp
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/* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
*/
/* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
rights reserved.
License to copy and use this software is granted provided that it
is identified as the "RSA Data Security, Inc. MD5 Message-Digest
Algorithm" in all material mentioning or referencing this software
or this function.
License is also granted to make and use derivative works provided
that such works are identified as "derived from the RSA Data
Security, Inc. MD5 Message-Digest Algorithm" in all material
mentioning or referencing the derived work.
RSA Data Security, Inc. makes no representations concerning either
the merchantability of this software or the suitability of this
software for any particular purpose. It is provided "as is"
without express or implied warranty of any kind.
These notices must be retained in any copies of any part of this
documentation and/or software.
*/
#include "md5.h"
#include <string.h>
namespace md5
{
enum
{
S11 = 7,
S12 = 12,
S13 = 17,
S14 = 22,
S21 = 5,
S22 = 9,
S23 = 14,
S24 = 20,
S31 = 4,
S32 = 11,
S33 = 16,
S34 = 23,
S41 = 6,
S42 = 10,
S43 = 15,
S44 = 21
};
const unsigned char PADDING[64]=
{
0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
inline u_int32_t F(u_int32_t x,u_int32_t y,u_int32_t z) { return (x & y) | (~x & z); }
inline u_int32_t G(u_int32_t x,u_int32_t y,u_int32_t z) { return (x & z) | (y & ~z); }
inline u_int32_t H(u_int32_t x,u_int32_t y,u_int32_t z) { return x ^ y ^ z; }
inline u_int32_t I(u_int32_t x,u_int32_t y,u_int32_t z) { return y ^ (x | ~z); }
inline u_int32_t ROTATE_LEFT(u_int32_t x,u_int32_t n) { return (x << n) | (x >> (32-n)); }
inline void FF(u_int32_t& a,u_int32_t b,u_int32_t c,u_int32_t d,u_int32_t x,u_int32_t s,u_int32_t ac)
{ a+=F(b,c,d)+x+ac; a=ROTATE_LEFT(a,s); a+=b; }
inline void GG(u_int32_t& a,u_int32_t b,u_int32_t c,u_int32_t d,u_int32_t x,u_int32_t s,u_int32_t ac)
{ a+=G(b,c,d)+x+ac; a=ROTATE_LEFT(a,s); a+=b; }
inline void HH(u_int32_t& a,u_int32_t b,u_int32_t c,u_int32_t d,u_int32_t x,u_int32_t s,u_int32_t ac)
{ a+=H(b,c,d)+x+ac; a=ROTATE_LEFT(a,s); a+=b; }
inline void II(u_int32_t& a,u_int32_t b,u_int32_t c,u_int32_t d,u_int32_t x,u_int32_t s,u_int32_t ac)
{ a+=I(b,c,d)+x+ac; a=ROTATE_LEFT(a,s); a+=b; }
void Encode(unsigned char* output,u_int32_t* input,unsigned int len)
{
unsigned int i, j;
for(i=0,j=0;j<len;i++,j+=4)
{
output[j]=(unsigned char)(input[i] & 0xff);
output[j+1]=(unsigned char)((input[i] >> 8) & 0xff);
output[j+2]=(unsigned char)((input[i] >> 16) & 0xff);
output[j+3]=(unsigned char)((input[i] >> 24) & 0xff);
}
}
void Decode(u_int32_t* output,const unsigned char* input,unsigned int len)
{
unsigned int i, j;
for(i=0,j=0;j<len;i++,j+=4)
{
output[i]=((u_int32_t)input[j]) | (((u_int32_t)input[j+1]) << 8) |
(((u_int32_t)input[j+2]) << 16) | (((u_int32_t)input[j+3]) << 24);
}
}
inline void MD5_memcpy(unsigned char* output,unsigned char* input,unsigned int len)
{ memcpy(output,input,len); }
inline void MD5_memset(unsigned char* output,int value,unsigned int len)
{ memset(output,value,len); }
void MD5Transform(u_int32_t* state,const unsigned char* block);
}
void md5::MD5Transform(u_int32_t* state,const unsigned char* block)
{
u_int32_t a=state[0], b=state[1], c=state[2], d=state[3], x[16];
Decode(x,block,64);
FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
MD5_memset((unsigned char*)x,0,sizeof(x));
}
void md5::MD5_Init(MD5_CTX* context)
{
context->count[0]=context->count[1]=0;
context->state[0]=0x67452301;
context->state[1]=0xefcdab89;
context->state[2]=0x98badcfe;
context->state[3]=0x10325476;
}
void md5::MD5_Update(MD5_CTX* context,const unsigned char* input,unsigned int inputLen)
{
unsigned int i,index,partLen;
index=(unsigned int)((context->count[0] >> 3) & 0x3F);
if((context->count[0] += ((u_int32_t)inputLen << 3)) < ((u_int32_t)inputLen << 3))
context->count[1]++;
context->count[1]+=((u_int32_t)inputLen >> 29);
partLen=64-index;
if(inputLen>=partLen)
{
MD5_memcpy((unsigned char*)&context->buffer[index],(unsigned char*)input,partLen);
MD5Transform(context->state,context->buffer);
for(i=partLen;i+63<inputLen;i+=64)
MD5Transform(context->state,&input[i]);
index=0;
}else
i=0;
MD5_memcpy((unsigned char*)&context->buffer[index],(unsigned char*)&input[i],inputLen-i);
}
void md5::MD5_Final(unsigned char* digest,MD5_CTX* context)
{
unsigned char bits[8];
unsigned int index,padLen;
Encode(bits,context->count,8);
index=(unsigned int)((context->count[0] >> 3) & 0x3f);
padLen=(index < 56) ? (56 - index) : (120 - index);
MD5_Update(context,PADDING,padLen);
MD5_Update(context,bits,8);
Encode(digest,context->state,16);
MD5_memset((unsigned char*)context,0,sizeof(*context));
}