291 lines
10 KiB
C
291 lines
10 KiB
C
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/*
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***********************************************************************
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** md5.c **
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** RSA Data Security, Inc. MD5 Message-Digest Algorithm **
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** Created: 2/17/90 RLR **
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** Revised: 1/91 SRD,AJ,BSK,JT Reference C Version **
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***********************************************************************
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*/
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/*
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***********************************************************************
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** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved. **
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** **
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** License to copy and use this software is granted provided that **
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** it is identified as the "RSA Data Security, Inc. MD5 Message- **
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** Digest Algorithm" in all material mentioning or referencing this **
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** software or this function. **
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** **
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** License is also granted to make and use derivative works **
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** provided that such works are identified as "derived from the RSA **
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** Data Security, Inc. MD5 Message-Digest Algorithm" in all **
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** material mentioning or referencing the derived work. **
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** **
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** RSA Data Security, Inc. makes no representations concerning **
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** either the merchantability of this software or the suitability **
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** of this software for any particular purpose. It is provided "as **
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** is" without express or implied warranty of any kind. **
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** **
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** These notices must be retained in any copies of any part of this **
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** documentation and/or software. **
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***********************************************************************
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*/
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// Portions copyright (c) 1992 Microsoft Corp.
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// All rights reserved
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#define UINT4 unsigned long
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#define ULONG unsigned long
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#include "md5.h"
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/* Constants for Transform routine.
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*/
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#define S11 7
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#define S12 12
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#define S13 17
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#define S14 22
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#define S21 5
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#define S22 9
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#define S23 14
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#define S24 20
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#define S31 4
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#define S32 11
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#define S33 16
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#define S34 23
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#define S41 6
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#define S42 10
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#define S43 15
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#define S44 21
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static void TransformMD5 PROTO_LIST ((UINT4 *, UINT4 *));
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static const unsigned char PADDING[64] = {
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0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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};
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/* F, G and H are basic MD5 functions */
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#define F(x, y, z) (z ^ (x & (y^z))) /* optimized version of (((x) & (y)) | ((~x) & (z))) */
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#define G(x, y, z) (y ^ (z & (x^y))) /* optimized version of (((x) & (z)) | ((y) & (~z))) */
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#define H(x, y, z) (x ^ y ^ z)
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#define I(x, y, z) (y ^ (x | ~z))
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/* ROTATE_LEFT rotates x left n bits.
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*/
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#define ROTATE_LEFT(x, n) _rotl((x), (n))
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/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */
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/* Rotation is separate from addition to prevent recomputation */
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#define FF(a, b, c, d, x, s, ac) \
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{(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
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(a) = ROTATE_LEFT ((a), (s)); \
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(a) += (b); \
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}
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#define GG(a, b, c, d, x, s, ac) \
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{(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
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(a) = ROTATE_LEFT ((a), (s)); \
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(a) += (b); \
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}
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#define HH(a, b, c, d, x, s, ac) \
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{(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
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(a) = ROTATE_LEFT ((a), (s)); \
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(a) += (b); \
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}
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#define II(a, b, c, d, x, s, ac) \
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{(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
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(a) = ROTATE_LEFT ((a), (s)); \
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(a) += (b); \
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}
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/*
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** MTS: Assumes mdContext is locked against simultaneous use.
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*/
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void MD5Init (mdContext)
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MD5_CTX *mdContext;
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{
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mdContext->i[0] = mdContext->i[1] = (UINT4)0;
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/* Load magic initialization constants.
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*/
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mdContext->buf[0] = (UINT4)0x67452301;
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mdContext->buf[1] = (UINT4)0xefcdab89;
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mdContext->buf[2] = (UINT4)0x98badcfe;
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mdContext->buf[3] = (UINT4)0x10325476;
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}
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/*
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** MTS: Assumes mdContext is locked against simultaneous use.
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*/
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void MD5Update (mdContext, inBuf, inLen)
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MD5_CTX *mdContext;
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const unsigned char *inBuf;
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unsigned int inLen;
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{
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UINT4 in[16];
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int mdi;
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unsigned int i, ii;
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/* compute number of bytes mod 64 */
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mdi = (int)((mdContext->i[0] >> 3) & 0x3f);
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/* update number of bits */
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if ((mdContext->i[0] + ((UINT4)inLen << 3)) < mdContext->i[0])
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mdContext->i[1]++;
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mdContext->i[0] += ((UINT4)inLen << 3);
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mdContext->i[1] += ((UINT4)inLen >> 29);
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while (inLen--) {
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/* add new character to buffer, increment mdi */
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mdContext->in[mdi++] = *inBuf++;
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/* transform if necessary */
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if (mdi == 0x40) {
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for (i = 0, ii = 0; i < 16; i++, ii += 4)
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in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
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(((UINT4)mdContext->in[ii+2]) << 16) |
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(((UINT4)mdContext->in[ii+1]) << 8) |
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((UINT4)mdContext->in[ii]);
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TransformMD5 (mdContext->buf, in);
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mdi = 0;
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}
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}
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}
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/*
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** MTS: Assumes mdContext is locked against simultaneous use.
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*/
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void MD5Final (mdContext)
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MD5_CTX *mdContext;
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{
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UINT4 in[16];
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int mdi;
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unsigned int i, ii;
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unsigned int padLen;
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/* save number of bits */
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in[14] = mdContext->i[0];
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in[15] = mdContext->i[1];
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/* compute number of bytes mod 64 */
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mdi = (int)((mdContext->i[0] >> 3) & 0x3f);
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/* pad out to 56 mod 64 */
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padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
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MD5Update (mdContext, PADDING, padLen);
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/* append length in bits and transform */
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for (i = 0, ii = 0; i < 14; i++, ii += 4)
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in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
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(((UINT4)mdContext->in[ii+2]) << 16) |
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(((UINT4)mdContext->in[ii+1]) << 8) |
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((UINT4)mdContext->in[ii]);
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TransformMD5 (mdContext->buf, in);
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/* store buffer in digest */
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for (i = 0, ii = 0; i < 4; i++, ii += 4) {
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mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xff);
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mdContext->digest[ii+1] =
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(unsigned char)((mdContext->buf[i] >> 8) & 0xff);
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mdContext->digest[ii+2] =
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(unsigned char)((mdContext->buf[i] >> 16) & 0xff);
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mdContext->digest[ii+3] =
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(unsigned char)((mdContext->buf[i] >> 24) & 0xff);
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}
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}
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/* Basic MD5 step. Transforms buf based on in.
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*/
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static void TransformMD5 (buf, in)
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UINT4 *buf;
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UINT4 *in;
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{
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UINT4 a = buf[0], b = buf[1], c = buf[2], d = buf[3];
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/* Round 1 */
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FF ( a, b, c, d, in[ 0], S11, 0xd76aa478); /* 1 */
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FF ( d, a, b, c, in[ 1], S12, 0xe8c7b756); /* 2 */
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FF ( c, d, a, b, in[ 2], S13, 0x242070db); /* 3 */
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FF ( b, c, d, a, in[ 3], S14, 0xc1bdceee); /* 4 */
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FF ( a, b, c, d, in[ 4], S11, 0xf57c0faf); /* 5 */
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FF ( d, a, b, c, in[ 5], S12, 0x4787c62a); /* 6 */
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FF ( c, d, a, b, in[ 6], S13, 0xa8304613); /* 7 */
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FF ( b, c, d, a, in[ 7], S14, 0xfd469501); /* 8 */
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FF ( a, b, c, d, in[ 8], S11, 0x698098d8); /* 9 */
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FF ( d, a, b, c, in[ 9], S12, 0x8b44f7af); /* 10 */
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FF ( c, d, a, b, in[10], S13, 0xffff5bb1); /* 11 */
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FF ( b, c, d, a, in[11], S14, 0x895cd7be); /* 12 */
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FF ( a, b, c, d, in[12], S11, 0x6b901122); /* 13 */
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FF ( d, a, b, c, in[13], S12, 0xfd987193); /* 14 */
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FF ( c, d, a, b, in[14], S13, 0xa679438e); /* 15 */
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FF ( b, c, d, a, in[15], S14, 0x49b40821); /* 16 */
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/* Round 2 */
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GG ( a, b, c, d, in[ 1], S21, 0xf61e2562); /* 17 */
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GG ( d, a, b, c, in[ 6], S22, 0xc040b340); /* 18 */
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GG ( c, d, a, b, in[11], S23, 0x265e5a51); /* 19 */
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GG ( b, c, d, a, in[ 0], S24, 0xe9b6c7aa); /* 20 */
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GG ( a, b, c, d, in[ 5], S21, 0xd62f105d); /* 21 */
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GG ( d, a, b, c, in[10], S22, 0x2441453); /* 22 */
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GG ( c, d, a, b, in[15], S23, 0xd8a1e681); /* 23 */
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GG ( b, c, d, a, in[ 4], S24, 0xe7d3fbc8); /* 24 */
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GG ( a, b, c, d, in[ 9], S21, 0x21e1cde6); /* 25 */
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GG ( d, a, b, c, in[14], S22, 0xc33707d6); /* 26 */
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GG ( c, d, a, b, in[ 3], S23, 0xf4d50d87); /* 27 */
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GG ( b, c, d, a, in[ 8], S24, 0x455a14ed); /* 28 */
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GG ( a, b, c, d, in[13], S21, 0xa9e3e905); /* 29 */
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GG ( d, a, b, c, in[ 2], S22, 0xfcefa3f8); /* 30 */
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GG ( c, d, a, b, in[ 7], S23, 0x676f02d9); /* 31 */
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GG ( b, c, d, a, in[12], S24, 0x8d2a4c8a); /* 32 */
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/* Round 3 */
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HH ( a, b, c, d, in[ 5], S31, 0xfffa3942); /* 33 */
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HH ( d, a, b, c, in[ 8], S32, 0x8771f681); /* 34 */
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HH ( c, d, a, b, in[11], S33, 0x6d9d6122); /* 35 */
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HH ( b, c, d, a, in[14], S34, 0xfde5380c); /* 36 */
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HH ( a, b, c, d, in[ 1], S31, 0xa4beea44); /* 37 */
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HH ( d, a, b, c, in[ 4], S32, 0x4bdecfa9); /* 38 */
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HH ( c, d, a, b, in[ 7], S33, 0xf6bb4b60); /* 39 */
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HH ( b, c, d, a, in[10], S34, 0xbebfbc70); /* 40 */
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HH ( a, b, c, d, in[13], S31, 0x289b7ec6); /* 41 */
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HH ( d, a, b, c, in[ 0], S32, 0xeaa127fa); /* 42 */
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HH ( c, d, a, b, in[ 3], S33, 0xd4ef3085); /* 43 */
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HH ( b, c, d, a, in[ 6], S34, 0x4881d05); /* 44 */
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HH ( a, b, c, d, in[ 9], S31, 0xd9d4d039); /* 45 */
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HH ( d, a, b, c, in[12], S32, 0xe6db99e5); /* 46 */
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HH ( c, d, a, b, in[15], S33, 0x1fa27cf8); /* 47 */
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HH ( b, c, d, a, in[ 2], S34, 0xc4ac5665); /* 48 */
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/* Round 4 */
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II ( a, b, c, d, in[ 0], S41, 0xf4292244); /* 49 */
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II ( d, a, b, c, in[ 7], S42, 0x432aff97); /* 50 */
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II ( c, d, a, b, in[14], S43, 0xab9423a7); /* 51 */
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II ( b, c, d, a, in[ 5], S44, 0xfc93a039); /* 52 */
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II ( a, b, c, d, in[12], S41, 0x655b59c3); /* 53 */
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II ( d, a, b, c, in[ 3], S42, 0x8f0ccc92); /* 54 */
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II ( c, d, a, b, in[10], S43, 0xffeff47d); /* 55 */
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II ( b, c, d, a, in[ 1], S44, 0x85845dd1); /* 56 */
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II ( a, b, c, d, in[ 8], S41, 0x6fa87e4f); /* 57 */
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II ( d, a, b, c, in[15], S42, 0xfe2ce6e0); /* 58 */
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II ( c, d, a, b, in[ 6], S43, 0xa3014314); /* 59 */
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II ( b, c, d, a, in[13], S44, 0x4e0811a1); /* 60 */
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II ( a, b, c, d, in[ 4], S41, 0xf7537e82); /* 61 */
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II ( d, a, b, c, in[11], S42, 0xbd3af235); /* 62 */
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II ( c, d, a, b, in[ 2], S43, 0x2ad7d2bb); /* 63 */
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II ( b, c, d, a, in[ 9], S44, 0xeb86d391); /* 64 */
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buf[0] += a;
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buf[1] += b;
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buf[2] += c;
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buf[3] += d;
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}
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