Code:
md5.c
#ifdef FREEBSD
# include <machine/endian.h>
#elif defined(LINUX)
# include <endian.h>
#elif defined(SOLARIS)
# include <sys/isa_defs.h>
#endif
#if __BYTE_ORDER == __BIG_ENDIAN
#define HIGHFIRST 1
#endif
/*
* 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 <string.h> /* for memcpy() */
#include "md5.h"
#ifndef HIGHFIRST
#define byteReverse(buf, len) /* Nothing */
#else
void byteReverse (unsigned char *buf, unsigned longs);
#ifndef ASM_MD5
/*
* Note: this code is harmless on little-endian machines.
*/
void byteReverse (unsigned char *buf, unsigned longs)
{
uint32 t;
do
{
t = (uint32) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
((unsigned) buf[1] << 8 | buf[0]);
*(uint32 *) buf = t;
buf += 4;
}
while (--longs);
}
#endif
#endif
/*
* Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
* initialization constants.
*/
void MD5Init (struct MD5Context *ctx)
{
ctx->buf[0] = 0x67452301;
ctx->buf[1] = 0xefcdab89;
ctx->buf[2] = 0x98badcfe;
ctx->buf[3] = 0x10325476;
ctx->bits[0] = 0;
ctx->bits[1] = 0;
}
/*
* Update context to reflect the concatenation of another buffer full
* of bytes.
*/
void MD5Update (struct MD5Context *ctx, unsigned char const *buf,
unsigned len)
{
uint32 t;
/* Update bitcount */
t = ctx->bits[0];
if ((ctx->bits[0] = t + ((uint32) 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);
byteReverse (ctx->in, 16);
MD5Transform (ctx->buf, (uint32 *) ctx->in);
buf += t;
len -= t;
}
/* Process data in 64-byte chunks */
while (len >= 64)
{
memcpy (ctx->in, buf, 64);
byteReverse (ctx->in, 16);
MD5Transform (ctx->buf, (uint32 *) ctx->in);
buf += 64;
len -= 64;
}
/* Handle any remaining bytes of data. */
memcpy (ctx->in, buf, len);
}
/*
* Final wrapup - pad to 64-byte boundary with the bit pattern
* 1 0* (64-bit count of bits processed, MSB-first)
*/
void MD5Final (unsigned char digest[16], struct MD5Context *ctx)
{
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);
byteReverse (ctx->in, 16);
MD5Transform (ctx->buf, (uint32 *) 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);
}
byteReverse (ctx->in, 14);
/* Append length in bits and transform */
((uint32 *) ctx->in)[14] = ctx->bits[0];
((uint32 *) ctx->in)[15] = ctx->bits[1];
MD5Transform (ctx->buf, (uint32 *) ctx->in);
byteReverse ((unsigned char *) ctx->buf, 4);
memcpy (digest, ctx->buf, 16);
memset (ctx, 0, sizeof (ctx)); /* In case it's sensitive */
}
#ifndef ASM_MD5
/* 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 )
/*
* 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 MD5Transform (uint32 buf[4], uint32 const in[16])
{
register uint32 a, b, c, d;
a = buf[0];
b = buf[1];
c = buf[2];
d = buf[3];
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);
buf[0] += a;
buf[1] += b;
buf[2] += c;
buf[3] += d;
}
#endif
