321 lines
9.6 KiB
C++
321 lines
9.6 KiB
C++
|
// Copyright (C) 2007 Id Software, Inc.
|
||
|
|
//
|
||
|
|
|
||
|
|
|
||
|
|
#include "../precompiled.h"
|
||
|
|
#pragma hdrstop
|
||
|
|
|
||
|
|
/*
|
||
|
|
MD5 Message Digest Algorithm. (RFC1321)
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
|
||
|
|
This code implements the MD5 message-digest algorithm.
|
||
|
|
The algorithm is due to Ron Rivest. This code was
|
||
|
|
written by Colin Plumb in 1993, no copyright is claimed.
|
||
|
|
This code is in the public domain; do with it what you wish.
|
||
|
|
|
||
|
|
Equivalent code is available from RSA Data Security, Inc.
|
||
|
|
This code has been tested against that, and is equivalent,
|
||
|
|
except that you don't need to include two pages of legalese
|
||
|
|
with every copy.
|
||
|
|
|
||
|
|
To compute the message digest of a chunk of bytes, declare an
|
||
|
|
MD5Context structure, pass it to MD5Init, call MD5Update as
|
||
|
|
needed on buffers full of bytes, and then call MD5Final, which
|
||
|
|
will fill a supplied 16-byte array with the digest.
|
||
|
|
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* MD5 context. */
|
||
|
|
typedef md5Context_t MD5_CTX;
|
||
|
|
|
||
|
|
/* The four core functions - F1 is optimized somewhat */
|
||
|
|
/* #define F1(x, y, z) (x & y | ~x & z) */
|
||
|
|
#define F1(x, y, z) (z ^ (x & (y ^ z)))
|
||
|
|
#define F2(x, y, z) F1(z, x, y)
|
||
|
|
#define F3(x, y, z) (x ^ y ^ z)
|
||
|
|
#define F4(x, y, z) (y ^ (x | ~z))
|
||
|
|
|
||
|
|
/* This is the central step in the MD5 algorithm. */
|
||
|
|
#define MD5STEP(f, w, x, y, z, data, s) ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
|
||
|
|
|
||
|
|
/*
|
||
|
|
=================
|
||
|
|
MD5_Transform
|
||
|
|
|
||
|
|
The core of the MD5 algorithm, this alters an existing MD5 hash to
|
||
|
|
reflect the addition of 16 longwords of new data. MD5Update blocks
|
||
|
|
the data and converts bytes into longwords for this routine.
|
||
|
|
=================
|
||
|
|
*/
|
||
|
|
void MD5_Transform( unsigned int state[4], unsigned int in[16] ) {
|
||
|
|
register unsigned int a, b, c, d;
|
||
|
|
|
||
|
|
a = state[0];
|
||
|
|
b = state[1];
|
||
|
|
c = state[2];
|
||
|
|
d = state[3];
|
||
|
|
|
||
|
|
LittleRevBytes( in, sizeof(unsigned int), 16 );
|
||
|
|
|
||
|
|
MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
|
||
|
|
MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
|
||
|
|
MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
|
||
|
|
MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
|
||
|
|
MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
|
||
|
|
MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
|
||
|
|
MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
|
||
|
|
MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
|
||
|
|
MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
|
||
|
|
MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
|
||
|
|
MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
|
||
|
|
MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
|
||
|
|
MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
|
||
|
|
MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
|
||
|
|
MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
|
||
|
|
MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
|
||
|
|
|
||
|
|
MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
|
||
|
|
MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
|
||
|
|
MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
|
||
|
|
MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
|
||
|
|
MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
|
||
|
|
MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
|
||
|
|
MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
|
||
|
|
MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
|
||
|
|
MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
|
||
|
|
MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
|
||
|
|
MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
|
||
|
|
MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
|
||
|
|
MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
|
||
|
|
MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
|
||
|
|
MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
|
||
|
|
MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
|
||
|
|
|
||
|
|
MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
|
||
|
|
MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
|
||
|
|
MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
|
||
|
|
MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
|
||
|
|
MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
|
||
|
|
MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
|
||
|
|
MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
|
||
|
|
MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
|
||
|
|
MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
|
||
|
|
MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
|
||
|
|
MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
|
||
|
|
MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
|
||
|
|
MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
|
||
|
|
MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
|
||
|
|
MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
|
||
|
|
MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
|
||
|
|
|
||
|
|
MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
|
||
|
|
MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
|
||
|
|
MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
|
||
|
|
MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
|
||
|
|
MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
|
||
|
|
MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
|
||
|
|
MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
|
||
|
|
MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
|
||
|
|
MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
|
||
|
|
MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
|
||
|
|
MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
|
||
|
|
MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
|
||
|
|
MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
|
||
|
|
MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
|
||
|
|
MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
|
||
|
|
MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
|
||
|
|
|
||
|
|
LittleRevBytes( in, sizeof(unsigned int), 16 );
|
||
|
|
|
||
|
|
state[0] += a;
|
||
|
|
state[1] += b;
|
||
|
|
state[2] += c;
|
||
|
|
state[3] += d;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
==================
|
||
|
|
MD5_Init
|
||
|
|
|
||
|
|
MD5 initialization. Begins an MD5 operation, writing a new context.
|
||
|
|
==================
|
||
|
|
*/
|
||
|
|
void MD5_Init( MD5_CTX *ctx ) {
|
||
|
|
ctx->state[0] = 0x67452301;
|
||
|
|
ctx->state[1] = 0xefcdab89;
|
||
|
|
ctx->state[2] = 0x98badcfe;
|
||
|
|
ctx->state[3] = 0x10325476;
|
||
|
|
|
||
|
|
ctx->bits[0] = 0;
|
||
|
|
ctx->bits[1] = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
===================
|
||
|
|
MD5_Update
|
||
|
|
|
||
|
|
MD5 block update operation. Continues an MD5 message-digest operation,
|
||
|
|
processing another message block, and updating the context.
|
||
|
|
===================
|
||
|
|
*/
|
||
|
|
void MD5_Update( MD5_CTX *ctx, unsigned char const *buf, unsigned int len ) {
|
||
|
|
unsigned int t;
|
||
|
|
|
||
|
|
/* Update bitcount */
|
||
|
|
|
||
|
|
t = ctx->bits[0];
|
||
|
|
if ( ( ctx->bits[0] = t + ( (unsigned int) len << 3 ) ) < t ) {
|
||
|
|
ctx->bits[1]++; /* Carry from low to high */
|
||
|
|
}
|
||
|
|
ctx->bits[1] += len >> 29;
|
||
|
|
|
||
|
|
t = ( t >> 3 ) & 0x3f; /* Bytes already in shsInfo->data */
|
||
|
|
|
||
|
|
/* Handle any leading odd-sized chunks */
|
||
|
|
|
||
|
|
if ( t ) {
|
||
|
|
unsigned char *p = (unsigned char *) ctx->in + t;
|
||
|
|
|
||
|
|
t = 64 - t;
|
||
|
|
if ( len < t ) {
|
||
|
|
memcpy( p, buf, len );
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
memcpy( p, buf, t );
|
||
|
|
MD5_Transform( ctx->state, (unsigned int *) ctx->in );
|
||
|
|
buf += t;
|
||
|
|
len -= t;
|
||
|
|
}
|
||
|
|
/* Process data in 64-byte chunks */
|
||
|
|
|
||
|
|
while( len >= 64 ) {
|
||
|
|
memcpy( ctx->in, buf, 64 );
|
||
|
|
MD5_Transform( ctx->state, (unsigned int *) ctx->in );
|
||
|
|
buf += 64;
|
||
|
|
len -= 64;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Handle any remaining bytes of data. */
|
||
|
|
memcpy( ctx->in, buf, len );
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
===============
|
||
|
|
MD5_Final
|
||
|
|
|
||
|
|
MD5 finalization. Ends an MD5 message-digest operation,
|
||
|
|
writing the message digest and zeroizing the context.
|
||
|
|
===============
|
||
|
|
*/
|
||
|
|
void MD5_Final( MD5_CTX *ctx, unsigned char digest[16] ) {
|
||
|
|
unsigned count;
|
||
|
|
unsigned char *p;
|
||
|
|
|
||
|
|
/* Compute number of bytes mod 64 */
|
||
|
|
count = ( ctx->bits[0] >> 3 ) & 0x3F;
|
||
|
|
|
||
|
|
/* Set the first char of padding to 0x80. This is safe since there is
|
||
|
|
always at least one byte free */
|
||
|
|
p = ctx->in + count;
|
||
|
|
*p++ = 0x80;
|
||
|
|
|
||
|
|
/* Bytes of padding needed to make 64 bytes */
|
||
|
|
count = 64 - 1 - count;
|
||
|
|
|
||
|
|
/* Pad out to 56 mod 64 */
|
||
|
|
if ( count < 8 ) {
|
||
|
|
/* Two lots of padding: Pad the first block to 64 bytes */
|
||
|
|
memset( p, 0, count );
|
||
|
|
MD5_Transform( ctx->state, (unsigned int *) ctx->in );
|
||
|
|
|
||
|
|
/* Now fill the next block with 56 bytes */
|
||
|
|
memset( ctx->in, 0, 56 );
|
||
|
|
} else {
|
||
|
|
/* Pad block to 56 bytes */
|
||
|
|
memset( p, 0, count - 8 );
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Append length in bits and transform */
|
||
|
|
unsigned int val0 = ctx->bits[0];
|
||
|
|
unsigned int val1 = ctx->bits[1];
|
||
|
|
|
||
|
|
((unsigned int *) ctx->in)[14] = LittleLong( val0 );
|
||
|
|
((unsigned int *) ctx->in)[15] = LittleLong( val1 );
|
||
|
|
|
||
|
|
MD5_Transform( ctx->state, (unsigned int *) ctx->in );
|
||
|
|
memcpy( digest, ctx->state, 16 );
|
||
|
|
memset( ctx, 0, sizeof( ctx ) ); /* In case it's sensitive */
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
===============
|
||
|
|
MD5_BlockChecksum
|
||
|
|
===============
|
||
|
|
*/
|
||
|
|
unsigned long MD5_BlockChecksum( const void *data, int length ) {
|
||
|
|
unsigned long digest[4];
|
||
|
|
unsigned long val;
|
||
|
|
MD5_CTX ctx;
|
||
|
|
|
||
|
|
MD5_Init( &ctx );
|
||
|
|
MD5_Update( &ctx, (unsigned char *)data, length );
|
||
|
|
MD5_Final( &ctx, (unsigned char *)digest );
|
||
|
|
|
||
|
|
val = digest[0] ^ digest[1] ^ digest[2] ^ digest[3];
|
||
|
|
|
||
|
|
return val;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
===============
|
||
|
|
MD5_StartChecksum
|
||
|
|
===============
|
||
|
|
*/
|
||
|
|
void MD5_StartChecksum( md5Context_t& context ) {
|
||
|
|
MD5_Init( &context );
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
===============
|
||
|
|
MD5_UpdateChecksum
|
||
|
|
===============
|
||
|
|
*/
|
||
|
|
void MD5_UpdateChecksum( md5Context_t& context, const void *data, int length ) {
|
||
|
|
MD5_Update( &context, (unsigned char *)data, length );
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
===============
|
||
|
|
MD5_FinishChecksum
|
||
|
|
===============
|
||
|
|
*/
|
||
|
|
unsigned long MD5_FinishChecksum( md5Context_t& context ) {
|
||
|
|
unsigned long digest[4];
|
||
|
|
unsigned long val;
|
||
|
|
|
||
|
|
MD5_Final( &context, (unsigned char *)digest );
|
||
|
|
|
||
|
|
val = digest[0] ^ digest[1] ^ digest[2] ^ digest[3];
|
||
|
|
|
||
|
|
return val;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
===============
|
||
|
|
MD5_FinishChecksum
|
||
|
|
===============
|
||
|
|
*/
|
||
|
|
unsigned long MD5_FinishChecksum( md5Context_t& context, unsigned char digest[16] ) {
|
||
|
|
unsigned long *dg;
|
||
|
|
unsigned long val;
|
||
|
|
|
||
|
|
MD5_Final( &context, (unsigned char *)digest );
|
||
|
|
dg = (unsigned long *)digest;
|
||
|
|
|
||
|
|
val = dg[0] ^ dg[1] ^ dg[2] ^ dg[3];
|
||
|
|
return val;
|
||
|
|
}
|