/*
* 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.
*/
# include <stdhdrs.h>
# include <strbuf.h>
# include <strops.h>
# include "md5.h"
/*
* Note: this code does not perturb data on little-endian machines.
*/
static void
load32( uint32 *target, unsigned const char *buf, unsigned longs )
{
#ifdef MD5NOBUF
MD5BufUnion bufUnion;
bufUnion.i=(uint32 *)buf;
#endif
do {
#ifdef MD5NOBUF
*target++=(uint32)*bufUnion.i++;
#else
*target++ = (uint32)
((unsigned) buf[3] << 8 | buf[2]) << 16 |
((unsigned) buf[1] << 8 | buf[0]);
buf += 4;
#endif
} while (--longs);
}
static void
save32( unsigned char *buf, const uint32 *source, unsigned longs )
{
do {
uint32 t = *source++;
buf[0] = ( t >> 0 ) & 0xff;
buf[1] = ( t >> 8 ) & 0xff;
buf[2] = ( t >> 16 ) & 0xff;
buf[3] = ( t >> 24 ) & 0xff;
buf += 4;
} while (--longs);
}
/*
* Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
* initialization constants.
*/
MD5::MD5()
{
md5[0] = 0x67452301;
md5[1] = 0xefcdab89;
md5[2] = 0x98badcfe;
md5[3] = 0x10325476;
bytes = 0;
bits = 0;
bufSelector = USE_ODDBUF;
}
/*
* Update context to reflect the concatenation of another buffer full
* of bytes.
*/
void
MD5::Update( const StrPtr &a )
{
unsigned len = a.Length();
inbuf = a.UText();
int t;
/* Update bitcount */
t = bytes;
bytes = ( bytes + len ) % 64;
bits += len * 8;
/* Handle any leading odd-sized chunks */
if (t) {
unsigned char *p = oddbuf + t;
t = 64 - t;
if (len < t) {
memcpy(p, inbuf, len);
return;
}
memcpy(p, inbuf, t);
#ifdef MD5NOBUF
bufSelector=USE_ODDBUF;
#else
load32(work, oddbuf, 16);
#endif
Transform();
inbuf += t;
len -= t;
}
/* Process data in 64-byte chunks */
#ifdef MD5NOBUF
bufSelector=USE_INBUF;
#endif
while (len >= 64) {
#ifndef MD5NOBUF
load32(work, inbuf, 16);
#endif
Transform();
inbuf += 64;
len -= 64;
}
/* Handle any remaining bytes of data. */
memcpy(oddbuf, inbuf, len);
}
/*
* Final wrapup - pad to 64-byte boundary with the bit pattern
* 1 0* (64-bit count of bits processed, MSB-first)
*/
void
MD5::Final( unsigned char digest[16] )
{
unsigned count;
unsigned char *p;
/* Set the first char of padding to 0x80. This is safe since there is
always at least one byte free */
p = oddbuf + bytes;
*p++ = 0x80;
/* Bytes of padding needed to make 64 bytes */
count = 64 - 1 - bytes;
/* Pad out to 56 mod 64 */
if (count < 8) {
/* Two lots of padding: Pad the first block to 64 bytes */
memset(p, 0, count);
#ifdef MD5NOBUF
bufSelector=USE_ODDBUF;
#else
load32( work, oddbuf, 16 );
#endif
Transform();
/* Now fill the next block with 56 bytes */
memset( oddbuf, 0, 56 );
} else {
/* Pad block to 56 bytes */
memset(p, 0, count - 8);
}
bufSelector=USE_WORKBUF;
load32( work, oddbuf, 14);
/* Append length in bits and transform */
work[14] = bits >> 0;
work[15] = bits >> 32;
Transform();
save32( digest, md5, 4 );
}
/* The four core functions - F1 is optimized somewhat */
#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. */
/* Source of the non-Windows macros Wei Dai crypto++ 5.6.1, "Public Domain" */
#ifdef OS_NT
# define MD5STEP(f, w, x, y, z, data, s) \
( w+= f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
#else
# define rotlFixed(x,y) \
((x<<y) | (x>>(32-y)))
# define MD5STEP(f, w, x, y, z, data, s) \
w = rotlFixed(w + f(x, y, z) + data, s) + x
#endif
/*
* 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()
{
register uint32 a, b, c, d;
#ifdef MD5NOBUF
MD5BufUnion bufUnion;
bufUnion.i=(uint32 *)(USE_INBUF==bufSelector?inbuf:oddbuf);
if (USE_WORKBUF==bufSelector)
bufUnion.i=work;
# define SOURCEPTR(y) (*(bufUnion.i+y))
#else
uint32 const *in = work;
# define SOURCEPTR(y) (*(in+y))
#endif
a = md5[0];
b = md5[1];
c = md5[2];
d = md5[3];
MD5STEP(F1, a, b, c, d, SOURCEPTR(0) + 0xd76aa478, 7);
MD5STEP(F1, d, a, b, c, SOURCEPTR(1) + 0xe8c7b756, 12);
MD5STEP(F1, c, d, a, b, SOURCEPTR(2) + 0x242070db, 17);
MD5STEP(F1, b, c, d, a, SOURCEPTR(3) + 0xc1bdceee, 22);
MD5STEP(F1, a, b, c, d, SOURCEPTR(4) + 0xf57c0faf, 7);
MD5STEP(F1, d, a, b, c, SOURCEPTR(5) + 0x4787c62a, 12);
MD5STEP(F1, c, d, a, b, SOURCEPTR(6) + 0xa8304613, 17);
MD5STEP(F1, b, c, d, a, SOURCEPTR(7) + 0xfd469501, 22);
MD5STEP(F1, a, b, c, d, SOURCEPTR(8) + 0x698098d8, 7);
MD5STEP(F1, d, a, b, c, SOURCEPTR(9) + 0x8b44f7af, 12);
MD5STEP(F1, c, d, a, b, SOURCEPTR(10) + 0xffff5bb1, 17);
MD5STEP(F1, b, c, d, a, SOURCEPTR(11) + 0x895cd7be, 22);
MD5STEP(F1, a, b, c, d, SOURCEPTR(12) + 0x6b901122, 7);
MD5STEP(F1, d, a, b, c, SOURCEPTR(13) + 0xfd987193, 12);
MD5STEP(F1, c, d, a, b, SOURCEPTR(14) + 0xa679438e, 17);
MD5STEP(F1, b, c, d, a, SOURCEPTR(15) + 0x49b40821, 22);
MD5STEP(F2, a, b, c, d, SOURCEPTR(1) + 0xf61e2562, 5);
MD5STEP(F2, d, a, b, c, SOURCEPTR(6) + 0xc040b340, 9);
MD5STEP(F2, c, d, a, b, SOURCEPTR(11) + 0x265e5a51, 14);
MD5STEP(F2, b, c, d, a, SOURCEPTR(0) + 0xe9b6c7aa, 20);
MD5STEP(F2, a, b, c, d, SOURCEPTR(5) + 0xd62f105d, 5);
MD5STEP(F2, d, a, b, c, SOURCEPTR(10) + 0x02441453, 9);
MD5STEP(F2, c, d, a, b, SOURCEPTR(15) + 0xd8a1e681, 14);
MD5STEP(F2, b, c, d, a, SOURCEPTR(4) + 0xe7d3fbc8, 20);
MD5STEP(F2, a, b, c, d, SOURCEPTR(9) + 0x21e1cde6, 5);
MD5STEP(F2, d, a, b, c, SOURCEPTR(14) + 0xc33707d6, 9);
MD5STEP(F2, c, d, a, b, SOURCEPTR(3) + 0xf4d50d87, 14);
MD5STEP(F2, b, c, d, a, SOURCEPTR(8) + 0x455a14ed, 20);
MD5STEP(F2, a, b, c, d, SOURCEPTR(13) + 0xa9e3e905, 5);
MD5STEP(F2, d, a, b, c, SOURCEPTR(2) + 0xfcefa3f8, 9);
MD5STEP(F2, c, d, a, b, SOURCEPTR(7) + 0x676f02d9, 14);
MD5STEP(F2, b, c, d, a, SOURCEPTR(12) + 0x8d2a4c8a, 20);
MD5STEP(F3, a, b, c, d, SOURCEPTR(5) + 0xfffa3942, 4);
MD5STEP(F3, d, a, b, c, SOURCEPTR(8) + 0x8771f681, 11);
MD5STEP(F3, c, d, a, b, SOURCEPTR(11) + 0x6d9d6122, 16);
MD5STEP(F3, b, c, d, a, SOURCEPTR(14) + 0xfde5380c, 23);
MD5STEP(F3, a, b, c, d, SOURCEPTR(1) + 0xa4beea44, 4);
MD5STEP(F3, d, a, b, c, SOURCEPTR(4) + 0x4bdecfa9, 11);
MD5STEP(F3, c, d, a, b, SOURCEPTR(7) + 0xf6bb4b60, 16);
MD5STEP(F3, b, c, d, a, SOURCEPTR(10) + 0xbebfbc70, 23);
MD5STEP(F3, a, b, c, d, SOURCEPTR(13) + 0x289b7ec6, 4);
MD5STEP(F3, d, a, b, c, SOURCEPTR(0) + 0xeaa127fa, 11);
MD5STEP(F3, c, d, a, b, SOURCEPTR(3) + 0xd4ef3085, 16);
MD5STEP(F3, b, c, d, a, SOURCEPTR(6) + 0x04881d05, 23);
MD5STEP(F3, a, b, c, d, SOURCEPTR(9) + 0xd9d4d039, 4);
MD5STEP(F3, d, a, b, c, SOURCEPTR(12) + 0xe6db99e5, 11);
MD5STEP(F3, c, d, a, b, SOURCEPTR(15) + 0x1fa27cf8, 16);
MD5STEP(F3, b, c, d, a, SOURCEPTR(2) + 0xc4ac5665, 23);
MD5STEP(F4, a, b, c, d, SOURCEPTR(0) + 0xf4292244, 6);
MD5STEP(F4, d, a, b, c, SOURCEPTR(7) + 0x432aff97, 10);
MD5STEP(F4, c, d, a, b, SOURCEPTR(14) + 0xab9423a7, 15);
MD5STEP(F4, b, c, d, a, SOURCEPTR(5) + 0xfc93a039, 21);
MD5STEP(F4, a, b, c, d, SOURCEPTR(12) + 0x655b59c3, 6);
MD5STEP(F4, d, a, b, c, SOURCEPTR(3) + 0x8f0ccc92, 10);
MD5STEP(F4, c, d, a, b, SOURCEPTR(10) + 0xffeff47d, 15);
MD5STEP(F4, b, c, d, a, SOURCEPTR(1) + 0x85845dd1, 21);
MD5STEP(F4, a, b, c, d, SOURCEPTR(8) + 0x6fa87e4f, 6);
MD5STEP(F4, d, a, b, c, SOURCEPTR(15) + 0xfe2ce6e0, 10);
MD5STEP(F4, c, d, a, b, SOURCEPTR(6) + 0xa3014314, 15);
MD5STEP(F4, b, c, d, a, SOURCEPTR(13) + 0x4e0811a1, 21);
MD5STEP(F4, a, b, c, d, SOURCEPTR(4) + 0xf7537e82, 6);
MD5STEP(F4, d, a, b, c, SOURCEPTR(11) + 0xbd3af235, 10);
MD5STEP(F4, c, d, a, b, SOURCEPTR(2) + 0x2ad7d2bb, 15);
MD5STEP(F4, b, c, d, a, SOURCEPTR(9) + 0xeb86d391, 21);
md5[0] += a;
md5[1] += b;
md5[2] += c;
md5[3] += d;
}
void
MD5::Final( StrBuf &output )
{
unsigned char digest[16];
Final( digest );
output.Clear();
StrOps::OtoX( digest, sizeof( digest ), output );
}