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270 lines
9.9 KiB
C++
270 lines
9.9 KiB
C++
#include "md5.h"
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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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/* -- include the following line if the md5.h header file is separate -- */
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/* #include "md5.h" */
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/* forward declaration */
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static void Transform (uint32_t *buf, uint32_t *in);
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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 and H are basic MD5 functions: selection, majority, parity */
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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) + (uint32_t)(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) + (uint32_t)(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) + (uint32_t)(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) + (uint32_t)(ac); \
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(a) = ROTATE_LEFT ((a), (s)); \
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(a) += (b); \
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}
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void MD5Init (MD5_CTX *mdContext)
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{
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mdContext->i[0] = mdContext->i[1] = (uint32_t)0;
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/* Load magic initialization constants.
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*/
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mdContext->buf[0] = (uint32_t)0x67452301;
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mdContext->buf[1] = (uint32_t)0xefcdab89;
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mdContext->buf[2] = (uint32_t)0x98badcfe;
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mdContext->buf[3] = (uint32_t)0x10325476;
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}
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void MD5Update (MD5_CTX *mdContext,unsigned char *inBuf,unsigned int inLen) {
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uint32_t 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] + ((uint32_t)inLen << 3)) < mdContext->i[0])
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mdContext->i[1]++;
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mdContext->i[0] += ((uint32_t)inLen << 3);
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mdContext->i[1] += ((uint32_t)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] = (((uint32_t)mdContext->in[ii+3]) << 24) |
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(((uint32_t)mdContext->in[ii+2]) << 16) |
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(((uint32_t)mdContext->in[ii+1]) << 8) |
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((uint32_t)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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void MD5Final (MD5_CTX *mdContext) {
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uint32_t 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] = (((uint32_t)mdContext->in[ii+3]) << 24) |
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(((uint32_t)mdContext->in[ii+2]) << 16) |
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(((uint32_t)mdContext->in[ii+1]) << 8) |
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((uint32_t)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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}
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/* Basic MD5 step. Transform buf based on in.
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*/
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static void Transform (uint32_t *buf, uint32_t *in) {
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uint32_t 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, 3614090360); /* 1 */
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FF ( d, a, b, c, in[ 1], S12, 3905402710); /* 2 */
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FF ( c, d, a, b, in[ 2], S13, 606105819); /* 3 */
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FF ( b, c, d, a, in[ 3], S14, 3250441966); /* 4 */
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FF ( a, b, c, d, in[ 4], S11, 4118548399); /* 5 */
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FF ( d, a, b, c, in[ 5], S12, 1200080426); /* 6 */
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FF ( c, d, a, b, in[ 6], S13, 2821735955); /* 7 */
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FF ( b, c, d, a, in[ 7], S14, 4249261313); /* 8 */
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FF ( a, b, c, d, in[ 8], S11, 1770035416); /* 9 */
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FF ( d, a, b, c, in[ 9], S12, 2336552879); /* 10 */
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FF ( c, d, a, b, in[10], S13, 4294925233); /* 11 */
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FF ( b, c, d, a, in[11], S14, 2304563134); /* 12 */
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FF ( a, b, c, d, in[12], S11, 1804603682); /* 13 */
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FF ( d, a, b, c, in[13], S12, 4254626195); /* 14 */
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FF ( c, d, a, b, in[14], S13, 2792965006); /* 15 */
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FF ( b, c, d, a, in[15], S14, 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, 4129170786); /* 17 */
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GG ( d, a, b, c, in[ 6], S22, 3225465664); /* 18 */
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GG ( c, d, a, b, in[11], S23, 643717713); /* 19 */
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GG ( b, c, d, a, in[ 0], S24, 3921069994); /* 20 */
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GG ( a, b, c, d, in[ 5], S21, 3593408605); /* 21 */
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GG ( d, a, b, c, in[10], S22, 38016083); /* 22 */
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GG ( c, d, a, b, in[15], S23, 3634488961); /* 23 */
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GG ( b, c, d, a, in[ 4], S24, 3889429448); /* 24 */
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GG ( a, b, c, d, in[ 9], S21, 568446438); /* 25 */
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GG ( d, a, b, c, in[14], S22, 3275163606); /* 26 */
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GG ( c, d, a, b, in[ 3], S23, 4107603335); /* 27 */
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GG ( b, c, d, a, in[ 8], S24, 1163531501); /* 28 */
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GG ( a, b, c, d, in[13], S21, 2850285829); /* 29 */
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GG ( d, a, b, c, in[ 2], S22, 4243563512); /* 30 */
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GG ( c, d, a, b, in[ 7], S23, 1735328473); /* 31 */
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GG ( b, c, d, a, in[12], S24, 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, 4294588738); /* 33 */
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HH ( d, a, b, c, in[ 8], S32, 2272392833); /* 34 */
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HH ( c, d, a, b, in[11], S33, 1839030562); /* 35 */
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HH ( b, c, d, a, in[14], S34, 4259657740); /* 36 */
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HH ( a, b, c, d, in[ 1], S31, 2763975236); /* 37 */
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HH ( d, a, b, c, in[ 4], S32, 1272893353); /* 38 */
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HH ( c, d, a, b, in[ 7], S33, 4139469664); /* 39 */
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HH ( b, c, d, a, in[10], S34, 3200236656); /* 40 */
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HH ( a, b, c, d, in[13], S31, 681279174); /* 41 */
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HH ( d, a, b, c, in[ 0], S32, 3936430074); /* 42 */
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HH ( c, d, a, b, in[ 3], S33, 3572445317); /* 43 */
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HH ( b, c, d, a, in[ 6], S34, 76029189); /* 44 */
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HH ( a, b, c, d, in[ 9], S31, 3654602809); /* 45 */
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HH ( d, a, b, c, in[12], S32, 3873151461); /* 46 */
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HH ( c, d, a, b, in[15], S33, 530742520); /* 47 */
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HH ( b, c, d, a, in[ 2], S34, 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, 4096336452); /* 49 */
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II ( d, a, b, c, in[ 7], S42, 1126891415); /* 50 */
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II ( c, d, a, b, in[14], S43, 2878612391); /* 51 */
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II ( b, c, d, a, in[ 5], S44, 4237533241); /* 52 */
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II ( a, b, c, d, in[12], S41, 1700485571); /* 53 */
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II ( d, a, b, c, in[ 3], S42, 2399980690); /* 54 */
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II ( c, d, a, b, in[10], S43, 4293915773); /* 55 */
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II ( b, c, d, a, in[ 1], S44, 2240044497); /* 56 */
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II ( a, b, c, d, in[ 8], S41, 1873313359); /* 57 */
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II ( d, a, b, c, in[15], S42, 4264355552); /* 58 */
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II ( c, d, a, b, in[ 6], S43, 2734768916); /* 59 */
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II ( b, c, d, a, in[13], S44, 1309151649); /* 60 */
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II ( a, b, c, d, in[ 4], S41, 4149444226); /* 61 */
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II ( d, a, b, c, in[11], S42, 3174756917); /* 62 */
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II ( c, d, a, b, in[ 2], S43, 718787259); /* 63 */
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II ( b, c, d, a, in[ 9], S44, 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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