md5.cpp

MD5算法的C++源代码

#include "md5.h"
#include<stdio.h>
#include <fstream.h>
#include <windows.h>
#include <iostream> 
#define S11 7 
#define S12 12 
#define S13 17 
#define S14 22 
#define S21 5 
#define S22 9 
#define S23 14 
#define S24 20 
#define S31 4 
#define S32 11 
#define S33 16 
#define S34 23 
#define S41 6 
#define S42 10 
#define S43 15 
#define S44 21 
 
void MD5Transform(UINT4 [4], unsigned char [64]); 
void Encode(unsigned char *, UINT4 *, unsigned int); 
void Decode(UINT4 *, unsigned char *, unsigned int); 
void MD5_memcpy(POINTER, POINTER, unsigned int); 
void MD5_memset(POINTER, int, unsigned int); 
 
static unsigned char PADDING[64] = { 
  0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 
}; 

#define F(x, y, z) (((x) & (y)) | ((~x) & (z))) 
#define G(x, y, z) (((x) & (z)) | ((y) & (~z))) 
#define H(x, y, z) ((x) ^ (y) ^ (z)) 
#define I(x, y, z) ((y) ^ ((x) | (~z))) 

#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) 
 
#define FF(a, b, c, d, x, s, ac) {(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac);(a) = ROTATE_LEFT ((a), (s));(a) += (b);}
#define GG(a, b, c, d, x, s, ac) {(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); (a) = ROTATE_LEFT ((a), (s));(a) += (b); }
#define HH(a, b, c, d, x, s, ac) {(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac);(a) = ROTATE_LEFT ((a), (s));(a) += (b);}
#define II(a, b, c, d, x, s, ac) {(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); (a) = ROTATE_LEFT ((a), (s)); (a) += (b); }
 
/* MD5 initialization. Begins an MD5 operation, writing a new context. 
 */ 
void MD5Init ( MD5_CTX *context)
{ 
  context->count[0] = context->count[1] = 0; 
  /* Load magic initialization constants. 
*/ 
  context->state[0] = 0x67452301; 
  context->state[1] = 0xefcdab89; 
  context->state[2] = 0x98badcfe; 
  context->state[3] = 0x10325476; 
} 
 
/* MD5 block update operation. Continues an MD5 message-digest 
  operation, processing another message block, and updating the 
  context. 
 */ 
void MD5Update ( MD5_CTX *context,unsigned char *input,unsigned int inputLen)
{ 
  unsigned int i, index, partLen; 
 
  /* Compute number of bytes mod 64 */ 
  index = (unsigned int)((context->count[0] >> 3) & 0x3F); 
 
  /* Update number of bits */ 
  if ((context->count[0] += ((UINT4)inputLen << 3)) 
   < ((UINT4)inputLen << 3)) 
 context->count[1]++; 
  context->count[1] += ((UINT4)inputLen >> 29); 
 
  partLen = 64 - index; 
 
  /* Transform as many times as possible. 
*/ 
  if (inputLen >= partLen) { 
 MD5_memcpy 
   ((POINTER)&context->buffer[index], (POINTER)input, partLen); 
 MD5Transform (context->state, context->buffer); 
 
 for (i = partLen; i + 63 < inputLen; i += 64) 
   MD5Transform (context->state, &input[i]); 
 
 index = 0; 
  } 
  else 
 i = 0; 
 
  /* Buffer remaining input */ 
  MD5_memcpy 
 ((POINTER)&context->buffer[index], (POINTER)&input[i], 
  inputLen-i); 
} 
 
/* MD5 finalization. Ends an MD5 message-digest operation, writing the 
  the message digest and zeroizing the context. 
 */ 
void MD5Final ( unsigned char digest[16],MD5_CTX *context)
{ 
  unsigned char bits[8]; 
  unsigned int index, padLen; 
 
  /* Save number of bits */ 
  Encode (bits, context->count, 8); 
 
  /* Pad out to 56 mod 64. 
*/ 
  index = (unsigned int)((context->count[0] >> 3) & 0x3f); 
  padLen = (index < 56) ? (56 - index) : (120 - index); 
  MD5Update (context, PADDING, padLen); 
 
  /* Append length (before padding) */ 
  MD5Update (context, bits, 8); 
 
  /* Store state in digest */ 
  Encode (digest, context->state, 16); 
 
  /* Zeroize sensitive information. 
*/ 
  MD5_memset ((POINTER)context, 0, sizeof (*context)); 
} 
 
/* MD5 basic transformation. Transforms state based on block. 
 */ 
void MD5Transform ( UINT4 state[4],unsigned char block[64])
{ 
  UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16]; 
 
  Decode (x, block, 64); 
 
  /* Round 1 */ 
  FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */ 
  FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */ 
  FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */ 
  FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */ 
  FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */ 
  FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */ 
  FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */ 
  FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */ 
  FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */ 
  FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */ 
  FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */ 
  FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */ 
  FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */ 
  FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */ 
  FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */ 
  FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */ 
 
 /* Round 2 */ 
  GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */ 
  GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */ 
  GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */ 
  GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */ 
  GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */ 
  GG (d, a, b, c, x[10], S22,  0x2441453); /* 22 */ 
  GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */ 
  GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */ 
  GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */ 
  GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */ 
  GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */ 
  GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */ 
  GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */ 
  GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */ 
  GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */ 
  GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */ 
 
  /* Round 3 */ 
  HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */ 
  HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */ 
  HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */ 
  HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */ 
  HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */ 
  HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */ 
  HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */ 
  HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */ 
  HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */ 
  HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */ 
  HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */ 
  HH (b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */ 
  HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */ 
  HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */ 
  HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */ 
  HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */ 
 
  /* Round 4 */ 
  II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */ 
  II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */ 
  II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */ 
  II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */ 
  II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */ 
  II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */ 
  II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */ 
  II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */ 
  II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */ 
  II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */ 
  II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */ 
  II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */ 
  II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */ 
  II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */ 
  II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */ 
  II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */ 
 
  state[0] += a; 
  state[1] += b; 
  state[2] += c; 
  state[3] += d; 
 
  /* Zeroize sensitive information. 
   */ 
  MD5_memset ((POINTER)x, 0, sizeof (x)); 
} 
 
/* Encodes input (UINT4) into output (unsigned char). Assumes len is 
  a multiple of 4. 
 */ 
void Encode( unsigned char *output,UINT4 *input,unsigned int len)
{ 
  unsigned int i, j; 
 
  for (i = 0, j = 0; j < len; i++, j += 4) { 
 output[j] = (unsigned char)(input[i] & 0xff); 
 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff); 
 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff); 
 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff); 
  } 
} 
 
/* Decodes input (unsigned char) into output (UINT4). Assumes len is 
  a multiple of 4. 
 */ 
void Decode( UINT4 *output,unsigned char *input,unsigned int len)
{ 
  unsigned int i, j; 
 
  for (i = 0, j = 0; j < len; i++, j += 4) 
 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) | 
   (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24); 
} 
 
/* Note: Replace "for loop" with standard memcpy if possible. 
 */ 
 
void MD5_memcpy( POINTER output,POINTER input,unsigned int len)
{ 
  unsigned int i; 
 
  for (i = 0; i < len; i++) 
    output[i] = input[i]; 
} 
 
/* Note: Replace "for loop" with standard memset if possible. 
 */ 
void MD5_memset( POINTER output,int value,unsigned int len)
{ 
  unsigned int i; 
 
  for (i = 0; i < len; i++) 
 ((char *)output)[i] = (char)value; 
} 
 
 
//---------------------------------------------------------------------------------------- 
// Purpose:	 
//---------------------------------------------------------------------------------------- 
int _EncryptString(const char* pszInputString, unsigned char *pbOutputBuf, int& iBufLen) 
{ 
	MD5_CTX context; 
	unsigned char digest[16]; 
 
	memset(digest, 0, sizeof(digest)); 
	if( (pszInputString != 0) && (strlen(pszInputString) > 0) && (iBufLen >= sizeof(digest)) ) 
	{ 
		unsigned int len = strlen(pszInputString); 
		MD5Init(&context); 
		MD5Update(&context, (unsigned char *)pszInputString, len); 
		MD5Final(digest, &context); 
 
		memcpy(pbOutputBuf, digest, sizeof(digest)); 
		iBufLen = sizeof(digest); 
 
		return 1; 
	} 
 
	return 0; 
} 
 
//---------------------------------------------------------------------------------------- 
// Purpose:	 
//---------------------------------------------------------------------------------------- 
int _ConvertMD5ToString(const unsigned char *pbMD5Buffer, int iMD5BufLen, char *pszMD5String, int iStringBufLen) 
{ 
	char *pTemp = pszMD5String; 
	for( int i = 0; i < 16; i++ ) 
	{ 
		sprintf(pTemp, "%02x", pbMD5Buffer[i]);
		pTemp += 2; 
	} 
 
	return strlen(pszMD5String); 
}