261 lines
7.8 KiB
C++
261 lines
7.8 KiB
C++
// MD5.cpp: implementation of the CMD5 class.
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//
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#include "stdafx.h"
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#include "MD5.h"
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#ifdef _DEBUG
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#undef THIS_FILE
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static char THIS_FILE[]=__FILE__;
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//#define new DEBUG_NEW
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#endif
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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 BYTE PADDING[64] = {
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0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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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) + (UINT)(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) + (UINT)(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) + (UINT)(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) + (UINT)(ac); \
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(a) = ROTATE_LEFT ((a), (s)); \
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(a) += (b); \
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}
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static void MD5Transform(UINT uState[4], BYTE byBlock[64]);
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static void Encode(BYTE* byOutput, UINT* uInput, UINT uLen);
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static void Decode(UINT* uOutput, BYTE* byInput, UINT uLen);
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//////////////////////////////////////////////////////////////////////
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// Construction/Destruction
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CMD5::CMD5()
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{
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}
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CMD5::~CMD5()
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{
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}
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void CMD5::GetHash(LPSTR pszStr, LPSTR pszHash)
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{
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MD5_CTX md5ctx;
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BYTE byDigest[16];
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MD5Init(&md5ctx);
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MD5Update(&md5ctx, (BYTE*)pszStr, (UINT)strlen(pszStr));
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MD5Final(byDigest, &md5ctx);
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pszHash[0] = NULL;
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char szTemp[5];
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for (int i = 0; i < 16; i++) {
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sprintf(szTemp, "%02X", byDigest[i]);
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strcat(pszHash, szTemp);
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}
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}
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void CMD5::MD5Init(MD5_CTX* md5ctx)
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{
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md5ctx->count[0] = md5ctx->count[1] = 0;
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md5ctx->state[0] = 0x67452301;
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md5ctx->state[1] = 0xefcdab89;
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md5ctx->state[2] = 0x98badcfe;
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md5ctx->state[3] = 0x10325476;
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}
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void CMD5::MD5Update (MD5_CTX* md5ctx, BYTE* byInput, UINT uInputLen)
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{
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UINT i, uIndex, nPartLen;
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uIndex = (UINT)((md5ctx->count[0] >> 3) & 0x3F);
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if ((md5ctx->count[0] += ((UINT)uInputLen << 3)) < ((UINT)uInputLen << 3))
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md5ctx->count[1]++;
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md5ctx->count[1] += ((UINT)uInputLen >> 29);
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nPartLen = 64 - uIndex;
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if (uInputLen >= nPartLen) {
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memcpy(&md5ctx->buffer[uIndex], byInput, nPartLen);
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MD5Transform(md5ctx->state, md5ctx->buffer);
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for (i = nPartLen; i + 63 < uInputLen; i += 64)
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MD5Transform (md5ctx->state, &byInput[i]);
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uIndex = 0;
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}
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else
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i = 0;
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memcpy(&md5ctx->buffer[uIndex], &byInput[i], uInputLen - i);
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}
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void CMD5::MD5Final(BYTE* byDigest, MD5_CTX* md5ctx)
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{
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BYTE byBits[8];
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UINT uIndex, nPadLen;
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Encode(byBits, md5ctx->count, 8);
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uIndex = (UINT)((md5ctx->count[0] >> 3) & 0x3f);
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nPadLen = uIndex < 56 ? (56 - uIndex) : (120 - uIndex);
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MD5Update(md5ctx, PADDING, nPadLen);
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MD5Update(md5ctx, byBits, 8);
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Encode (byDigest, md5ctx->state, 16);
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memset (md5ctx, 0, sizeof(*md5ctx));
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}
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static void MD5Transform(UINT uState[4], BYTE byBlock[64])
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{
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UINT a = uState[0], b = uState[1], c = uState[2], d = uState[3], x[16];
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Decode(x, byBlock, 64);
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// Round 1
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FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
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FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
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FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
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FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
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FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
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FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
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FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
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FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
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FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
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FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
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FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
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FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
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FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
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FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
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FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
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FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
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// Round 2
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GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
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GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
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GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
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GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
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GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
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GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
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GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
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GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
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GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
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GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
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GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
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GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
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GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
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GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
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GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
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GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
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// Round 3
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HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
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HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
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HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
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HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
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HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
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HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
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HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
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HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
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HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
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HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
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HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
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HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
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HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
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HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
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HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
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HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
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// Round 4
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II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
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II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
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II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
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II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
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II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
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II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
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II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
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II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
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II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
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II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
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II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
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II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
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II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
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II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
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II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
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II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
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uState[0] += a;
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uState[1] += b;
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uState[2] += c;
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uState[3] += d;
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// Zeroize sensitive information.
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memset(x, 0, sizeof(x));
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}
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static void Encode(BYTE* byOutput, UINT* uInput, UINT uLen)
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{
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for (UINT i = 0, j = 0; j < uLen; i++, j += 4) {
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byOutput[j] = (BYTE)(uInput[i] & 0xff);
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byOutput[j + 1] = (BYTE)((uInput[i] >> 8) & 0xff);
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byOutput[j + 2] = (BYTE)((uInput[i] >> 16) & 0xff);
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byOutput[j + 3] = (BYTE)((uInput[i] >> 24) & 0xff);
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}
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}
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static void Decode(UINT* uOutput, BYTE* byInput, UINT uLen)
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{
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for (UINT i = 0, j = 0; j < uLen; i++, j += 4)
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uOutput[i] = ((UINT)byInput[j]) | (((UINT)byInput[j + 1]) << 8) |
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(((UINT)byInput[j + 2]) << 16) | (((UINT)byInput[j + 3]) << 24);
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}
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