307 lines
11 KiB
C
307 lines
11 KiB
C
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/*
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***********************************************************************
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** md5.c -- the source code for MD5 routines **
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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 ver., 7/10 constant corr. **
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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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#include <string.h>
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#include "md5.h"
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/*
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***********************************************************************
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** Message-digest routines: **
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** To form the message digest for a message M **
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** (1) Initialize a context buffer mdContext using MD5_Init **
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** (2) Call MD5_Update on mdContext and M **
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** (3) Call MD5_Final on mdContext **
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** The message digest is now in mdContext->digest[0...15] **
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***********************************************************************
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*/
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/* forward declaration */
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static void Transform ();
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static 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, H and I are basic MD5 functions */
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#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
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#define G(x, y, z) (((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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#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(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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#ifdef __STDC__
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#define UL(x) x##U
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#else
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#define UL(x) x
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#endif
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/* The routine MD5_Init initializes the message-digest context
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mdContext. All fields are set to zero.
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*/
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void MD5_Init (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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/* The routine MD5Update updates the message-digest context to
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account for the presence of each of the characters inBuf[0..inLen-1]
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in the message whose digest is being computed.
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*/
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void MD5_Update (mdContext, inBuf, inLen)
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MD5_CTX *mdContext;
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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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Transform (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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/* The routine MD5Final terminates the message-digest computation and
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ends with the desired message digest in mdContext->digest[0...15].
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*/
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void MD5_Final (hash, mdContext)
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unsigned char hash[];
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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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MD5_Update (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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Transform (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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memcpy(hash, mdContext->digest, 16);
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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 Transform (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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#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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FF ( a, b, c, d, in[ 0], S11, UL(3614090360)); /* 1 */
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FF ( d, a, b, c, in[ 1], S12, UL(3905402710)); /* 2 */
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FF ( c, d, a, b, in[ 2], S13, UL( 606105819)); /* 3 */
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FF ( b, c, d, a, in[ 3], S14, UL(3250441966)); /* 4 */
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FF ( a, b, c, d, in[ 4], S11, UL(4118548399)); /* 5 */
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FF ( d, a, b, c, in[ 5], S12, UL(1200080426)); /* 6 */
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FF ( c, d, a, b, in[ 6], S13, UL(2821735955)); /* 7 */
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FF ( b, c, d, a, in[ 7], S14, UL(4249261313)); /* 8 */
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FF ( a, b, c, d, in[ 8], S11, UL(1770035416)); /* 9 */
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FF ( d, a, b, c, in[ 9], S12, UL(2336552879)); /* 10 */
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FF ( c, d, a, b, in[10], S13, UL(4294925233)); /* 11 */
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FF ( b, c, d, a, in[11], S14, UL(2304563134)); /* 12 */
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FF ( a, b, c, d, in[12], S11, UL(1804603682)); /* 13 */
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FF ( d, a, b, c, in[13], S12, UL(4254626195)); /* 14 */
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FF ( c, d, a, b, in[14], S13, UL(2792965006)); /* 15 */
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FF ( b, c, d, a, in[15], S14, UL(1236535329)); /* 16 */
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/* Round 2 */
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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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GG ( a, b, c, d, in[ 1], S21, UL(4129170786)); /* 17 */
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GG ( d, a, b, c, in[ 6], S22, UL(3225465664)); /* 18 */
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GG ( c, d, a, b, in[11], S23, UL( 643717713)); /* 19 */
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GG ( b, c, d, a, in[ 0], S24, UL(3921069994)); /* 20 */
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GG ( a, b, c, d, in[ 5], S21, UL(3593408605)); /* 21 */
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GG ( d, a, b, c, in[10], S22, UL( 38016083)); /* 22 */
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GG ( c, d, a, b, in[15], S23, UL(3634488961)); /* 23 */
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GG ( b, c, d, a, in[ 4], S24, UL(3889429448)); /* 24 */
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GG ( a, b, c, d, in[ 9], S21, UL( 568446438)); /* 25 */
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GG ( d, a, b, c, in[14], S22, UL(3275163606)); /* 26 */
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GG ( c, d, a, b, in[ 3], S23, UL(4107603335)); /* 27 */
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GG ( b, c, d, a, in[ 8], S24, UL(1163531501)); /* 28 */
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GG ( a, b, c, d, in[13], S21, UL(2850285829)); /* 29 */
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GG ( d, a, b, c, in[ 2], S22, UL(4243563512)); /* 30 */
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GG ( c, d, a, b, in[ 7], S23, UL(1735328473)); /* 31 */
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GG ( b, c, d, a, in[12], S24, UL(2368359562)); /* 32 */
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/* Round 3 */
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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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HH ( a, b, c, d, in[ 5], S31, UL(4294588738)); /* 33 */
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HH ( d, a, b, c, in[ 8], S32, UL(2272392833)); /* 34 */
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HH ( c, d, a, b, in[11], S33, UL(1839030562)); /* 35 */
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HH ( b, c, d, a, in[14], S34, UL(4259657740)); /* 36 */
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HH ( a, b, c, d, in[ 1], S31, UL(2763975236)); /* 37 */
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HH ( d, a, b, c, in[ 4], S32, UL(1272893353)); /* 38 */
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HH ( c, d, a, b, in[ 7], S33, UL(4139469664)); /* 39 */
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HH ( b, c, d, a, in[10], S34, UL(3200236656)); /* 40 */
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HH ( a, b, c, d, in[13], S31, UL( 681279174)); /* 41 */
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HH ( d, a, b, c, in[ 0], S32, UL(3936430074)); /* 42 */
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HH ( c, d, a, b, in[ 3], S33, UL(3572445317)); /* 43 */
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HH ( b, c, d, a, in[ 6], S34, UL( 76029189)); /* 44 */
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HH ( a, b, c, d, in[ 9], S31, UL(3654602809)); /* 45 */
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HH ( d, a, b, c, in[12], S32, UL(3873151461)); /* 46 */
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HH ( c, d, a, b, in[15], S33, UL( 530742520)); /* 47 */
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HH ( b, c, d, a, in[ 2], S34, UL(3299628645)); /* 48 */
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/* Round 4 */
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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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II ( a, b, c, d, in[ 0], S41, UL(4096336452)); /* 49 */
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II ( d, a, b, c, in[ 7], S42, UL(1126891415)); /* 50 */
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II ( c, d, a, b, in[14], S43, UL(2878612391)); /* 51 */
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II ( b, c, d, a, in[ 5], S44, UL(4237533241)); /* 52 */
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II ( a, b, c, d, in[12], S41, UL(1700485571)); /* 53 */
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II ( d, a, b, c, in[ 3], S42, UL(2399980690)); /* 54 */
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II ( c, d, a, b, in[10], S43, UL(4293915773)); /* 55 */
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II ( b, c, d, a, in[ 1], S44, UL(2240044497)); /* 56 */
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II ( a, b, c, d, in[ 8], S41, UL(1873313359)); /* 57 */
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II ( d, a, b, c, in[15], S42, UL(4264355552)); /* 58 */
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II ( c, d, a, b, in[ 6], S43, UL(2734768916)); /* 59 */
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II ( b, c, d, a, in[13], S44, UL(1309151649)); /* 60 */
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II ( a, b, c, d, in[ 4], S41, UL(4149444226)); /* 61 */
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II ( d, a, b, c, in[11], S42, UL(3174756917)); /* 62 */
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II ( c, d, a, b, in[ 2], S43, UL( 718787259)); /* 63 */
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II ( b, c, d, a, in[ 9], S44, UL(3951481745)); /* 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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/*
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***********************************************************************
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** End of md5.c **
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******************************** (cut) ********************************
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*/
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