/* * $Id: md5.c,v 1.2 2003/10/20 18:59:57 tomcollins Exp $ * Copyright (C) 1999-2003 Inter7 Internet Technologies, Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA * */#include <string.h>		/* for memcpy() */#include "md5.h"void byteReverse(unsigned char *buf, unsigned longs);/* * 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);}/* * 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