2.8 MD5

md5.h

/* 
 ********************************************************************** 
 ** md5.h -- Header file for implementation of MD5                   ** 
 ** RSA Data Security, Inc. MD5 Message Digest Algorithm             ** 
 ** Created: 2/17/90 RLR                                             ** 
 ** Revised: 12/27/90 SRD,AJ,BSK,JT Reference C version              ** 
 ** Revised (for MD5): RLR 4/27/91                                   ** 
 **   -- G modified to have y&~z instead of y&z                      ** 
 **   -- FF, GG, HH modified to add in last register done            ** 
 **   -- Access pattern: round 2 works mod 5, round 3 works mod 3    ** 
 **   -- distinct additive constant for each step                    ** 
 **   -- round 4 added, working mod 7                                ** 
 ********************************************************************** 
 */  

/* 
 ********************************************************************** 
 ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved. ** 
 **                                                                  ** 
 ** License to copy and use this software is granted provided that   ** 
 ** it is identified as the "RSA Data Security, Inc. MD5 Message     ** 
 ** Digest Algorithm" in all material mentioning or referencing this ** 
 ** software or this function.                                       ** 
 **                                                                  ** 
 ** License is also granted to make and use derivative works         ** 
 ** provided that such works are identified as "derived from the RSA ** 
 ** Data Security, Inc. MD5 Message Digest Algorithm" in all         ** 
 ** material mentioning or referencing the derived work.             ** 
 **                                                                  ** 
 ** RSA Data Security, Inc. makes no representations concerning      ** 
 ** either the merchantability of this software or the suitability   ** 
 ** of this software for any particular purpose.  It is provided "as ** 
 ** is" without express or implied warranty of any kind.             ** 
 **                                                                  ** 
 ** These notices must be retained in any copies of any part of this ** 
 ** documentation and/or software.                                   ** 
 ********************************************************************** 
 */

#ifndef __MD5_H_
#define __MD5_H_
#include "Type.h"

#define _MD5_MAX        32

/* Data structure for MD5 (Message Digest) computation */  
typedef struct {  
    DWORD i[2];                   /* number of _bits_ handled mod 2^64 */  
    DWORD buf[4];                                    /* scratch buffer */  
    BYTE in[64];                              /* input buffer */  
    BYTE digest[16];     /* actual digest after MD5Final call */  
} _MD5_CTX;

/**
 *        计算指定字符串的md5值
 *@data            待MD5的数据
 *@datalen        待md5数据的长度
 *@md5Value        OUT MD计算结果
 *@md5ValueMax    md5Value缓冲区大小(
                                     如果小于16字节,则返回失败;
                                     如果小区32字节则返回16字节的编码;
                                     如果大于等于32字节,则返回32字节的bcd编码)
 *@return        成功返回md5Value的使用字节数
 *                失败返回 -1
 *@notes        一般情况下,MD5的结果为16或32字节,32字节为16字节的bcd编码。
 */
int Md5(BYTE* data,int datalen,BYTE* md5Value,int md5ValueMax);
#define _md5  Md5


/**
 *        计算指定文件的md5值
 *@pcFilePath        待计算MD5的文件路径
 *@md5Value        OUT MD计算结果
 *@md5ValueMax    md5Value缓冲区大小(
                                如果小于16字节,则返回失败;
                                如果小区32字节则返回16字节的编码;
                                如果大于等于32字节,则返回32字节的bcd编码)
 *@return        成功返回md5Value的使用字节数
 *                失败返回 -1
 *@notes        一般情况下,MD5的结果为16或32字节,32字节为16字节的bcd编码。
 */
int CalcFileMd5(char* pcFilePath,BYTE* md5Value,int md5ValueMax);

/**
 *      Md5初始化
 *@mdContext        md5上下文
 *@return           无
 */
void Md5Init (_MD5_CTX *mdContext);

/**
 *      执行MD计算
 *@mdContext        MD5上下文,Md5Init初始化过。
 *@inBuf            待MD5计算的内容
 *@inLen            内容长度
 */
void Md5Update (_MD5_CTX *mdContext, BYTE *inBuf, DWORD inLen);

/**
 *      完成MD计算
 */
void Md5Final (_MD5_CTX *mdContext);



/**
 *        随机数Md5加密
 *@plaintext        加密前的明文
 *@plaintextLen        明文长度
 *@randtext            随机内容
 *@randtextLen        随机内容长度
 *@encryption        存放密文的空间
 *@encryptionMax    密文空间最大容量
 *@return            成功返回加密后的内容长度
 *                    失败返回 -1
 */
int RandMd5(char* plaintext,int plaintextLen,char* randtext,int randtextLen,char* encryption,int encryptionMax);

#endif

md5.c

/* 
 ********************************************************************** 
 ** md5.c                                                            ** 
 ** RSA Data Security, Inc. MD5 Message Digest Algorithm             ** 
 ** Created: 2/17/90 RLR                                             ** 
 ** Revised: 1/91 SRD,AJ,BSK,JT Reference C Version                  ** 
 ********************************************************************** 
 */  

/* 
 ********************************************************************** 
 ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved. ** 
 **                                                                  ** 
 ** License to copy and use this software is granted provided that   ** 
 ** it is identified as the "RSA Data Security, Inc. MD5 Message     ** 
 ** Digest Algorithm" in all material mentioning or referencing this ** 
 ** software or this function.                                       ** 
 **                                                                  ** 
 ** License is also granted to make and use derivative works         ** 
 ** provided that such works are identified as "derived from the RSA ** 
 ** Data Security, Inc. MD5 Message Digest Algorithm" in all         ** 
 ** material mentioning or referencing the derived work.             ** 
 **                                                                  ** 
 ** RSA Data Security, Inc. makes no representations concerning      ** 
 ** either the merchantability of this software or the suitability   ** 
 ** of this software for any particular purpose.  It is provided "as ** 
 ** is" without express or implied warranty of any kind.             ** 
 **                                                                  ** 
 ** These notices must be retained in any copies of any part of this ** 
 ** documentation and/or software.                                   ** 
 ********************************************************************** 
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "Md5.h"


/* forward declaration */  
static void Transform (DWORD *buf, DWORD *in) ;

static unsigned char PADDING[64] = {  
  0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00  
};  

/* F, G and H are basic MD5 functions: selection, majority, parity */  
#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)))   

/* ROTATE_LEFT rotates x left n bits */  
#if 1// LITTLE_ENDIAN
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))  
#else
#define ROTATE_LEFT(x, n) (((x) << (32 - (n))) | ((x) >> (n)))  
#endif

/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */  
/* Rotation is separate from addition to prevent recomputation */  
#define FF(a, b, c, d, x, s, ac) \
  {(a) += F ((b), (c), (d)) + (x) + (DWORD)(ac); \
   (a) = ROTATE_LEFT ((a), (s)); \
   (a) += (b); \
  }  
#define GG(a, b, c, d, x, s, ac) \
  {(a) += G ((b), (c), (d)) + (x) + (DWORD)(ac); \
   (a) = ROTATE_LEFT ((a), (s)); \
   (a) += (b); \
  }  
#define HH(a, b, c, d, x, s, ac) \
  {(a) += H ((b), (c), (d)) + (x) + (DWORD)(ac); \
   (a) = ROTATE_LEFT ((a), (s)); \
   (a) += (b); \
  }  
#define II(a, b, c, d, x, s, ac) \
  {(a) += I ((b), (c), (d)) + (x) + (DWORD)(ac); \
   (a) = ROTATE_LEFT ((a), (s)); \
   (a) += (b); \
  }  

void Md5Init (_MD5_CTX *mdContext)  
{  
  mdContext->i[0] = mdContext->i[1] = (DWORD)0;  

  /* Load magic initialization constants. 
   */  
  mdContext->buf[0] = (DWORD)0x67452301;  
  mdContext->buf[1] = (DWORD)0xefcdab89;  
  mdContext->buf[2] = (DWORD)0x98badcfe;  
  mdContext->buf[3] = (DWORD)0x10325476;
}  

void Md5Update (_MD5_CTX *mdContext, BYTE *inBuf, DWORD inLen)  
{  
  DWORD in[16];  
  int mdi;  
  unsigned int i, ii;  

  /* compute number of bytes mod 64 */  
  mdi = (int)((mdContext->i[0] >> 3) & 0x3F);  

  /* update number of bits */  
  if ((mdContext->i[0] + ((DWORD)inLen << 3)) < mdContext->i[0])  
    mdContext->i[1]++;  
  mdContext->i[0] += ((DWORD)inLen << 3);  
  mdContext->i[1] += ((DWORD)inLen >> 29);  

  while (inLen--) {  
    /* add new character to buffer, increment mdi */  
    mdContext->in[mdi++] = *inBuf++;  

    /* transform if necessary */  
    if (mdi == 0x40) {  
      for (i = 0, ii = 0; i < 16; i++, ii += 4)  
        in[i] = (((DWORD)mdContext->in[ii+3]) << 24) |  
                (((DWORD)mdContext->in[ii+2]) << 16) |  
                (((DWORD)mdContext->in[ii+1]) << 8) |  
                ((DWORD)mdContext->in[ii]);
      Transform (mdContext->buf, in);  
      mdi = 0;  
    }  
  }  
}  

void Md5Final (_MD5_CTX *mdContext)  

{  
  DWORD in[16];  
  int mdi;  
  unsigned int i, ii;  
  unsigned int padLen;  

  /* save number of bits */  
  in[14] = mdContext->i[0];  
  in[15] = mdContext->i[1];  

  /* compute number of bytes mod 64 */  
  mdi = (int)((mdContext->i[0] >> 3) & 0x3F);  

  /* pad out to 56 mod 64 */  
  padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);  
  Md5Update (mdContext, PADDING, padLen);  

  /* append length in bits and transform */  
  for (i = 0, ii = 0; i < 14; i++, ii += 4)  
    in[i] = (((DWORD)mdContext->in[ii+3]) << 24) |  
            (((DWORD)mdContext->in[ii+2]) << 16) |  
            (((DWORD)mdContext->in[ii+1]) << 8) |  
            ((DWORD)mdContext->in[ii]);  
  Transform (mdContext->buf, in);  

  /* store buffer in digest */  
  for (i = 0, ii = 0; i < 4; i++, ii += 4) {  
    mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF);  
    mdContext->digest[ii+1] =  
      (unsigned char)((mdContext->buf[i] >> 8) & 0xFF);  
    mdContext->digest[ii+2] =  
      (unsigned char)((mdContext->buf[i] >> 16) & 0xFF);  
    mdContext->digest[ii+3] =  
      (unsigned char)((mdContext->buf[i] >> 24) & 0xFF);  
  }  
}  

/* Basic MD5 step. Transform buf based on in. 
 */  
static void Transform (DWORD *buf, DWORD *in)  
{  
  DWORD a = buf[0], b = buf[1], c = buf[2], d = buf[3];  

  /* Round 1 */  
#define S11 7  
#define S12 12  
#define S13 17  
#define S14 22  
  FF ( a, b, c, d, in[ 0], S11, 3614090360UL); /* 1 */  
  FF ( d, a, b, c, in[ 1], S12, 3905402710UL); /* 2 */  
  FF ( c, d, a, b, in[ 2], S13,  606105819UL); /* 3 */  
  FF ( b, c, d, a, in[ 3], S14, 3250441966UL); /* 4 */  
  FF ( a, b, c, d, in[ 4], S11, 4118548399UL); /* 5 */  
  FF ( d, a, b, c, in[ 5], S12, 1200080426UL); /* 6 */  
  FF ( c, d, a, b, in[ 6], S13, 2821735955UL); /* 7 */  
  FF ( b, c, d, a, in[ 7], S14, 4249261313UL); /* 8 */  
  FF ( a, b, c, d, in[ 8], S11, 1770035416UL); /* 9 */  
  FF ( d, a, b, c, in[ 9], S12, 2336552879UL); /* 10 */  
  FF ( c, d, a, b, in[10], S13, 4294925233UL); /* 11 */  
  FF ( b, c, d, a, in[11], S14, 2304563134UL); /* 12 */  
  FF ( a, b, c, d, in[12], S11, 1804603682UL); /* 13 */  
  FF ( d, a, b, c, in[13], S12, 4254626195UL); /* 14 */  
  FF ( c, d, a, b, in[14], S13, 2792965006UL); /* 15 */  
  FF ( b, c, d, a, in[15], S14, 1236535329UL); /* 16 */  


  /* Round 2 */  
#define S21 5  
#define S22 9  
#define S23 14  
#define S24 20  
  GG ( a, b, c, d, in[ 1], S21, 4129170786UL); /* 17 */  
  GG ( d, a, b, c, in[ 6], S22, 3225465664UL); /* 18 */  
  GG ( c, d, a, b, in[11], S23,  643717713UL); /* 19 */  
  GG ( b, c, d, a, in[ 0], S24, 3921069994UL); /* 20 */  
  GG ( a, b, c, d, in[ 5], S21, 3593408605UL); /* 21 */  
  GG ( d, a, b, c, in[10], S22,   38016083UL); /* 22 */  
  GG ( c, d, a, b, in[15], S23, 3634488961UL); /* 23 */  
  GG ( b, c, d, a, in[ 4], S24, 3889429448UL); /* 24 */  
  GG ( a, b, c, d, in[ 9], S21,  568446438UL); /* 25 */  
  GG ( d, a, b, c, in[14], S22, 3275163606UL); /* 26 */  
  GG ( c, d, a, b, in[ 3], S23, 4107603335UL); /* 27 */  
  GG ( b, c, d, a, in[ 8], S24, 1163531501UL); /* 28 */  
  GG ( a, b, c, d, in[13], S21, 2850285829UL); /* 29 */  
  GG ( d, a, b, c, in[ 2], S22, 4243563512UL); /* 30 */  
  GG ( c, d, a, b, in[ 7], S23, 1735328473UL); /* 31 */  
  GG ( b, c, d, a, in[12], S24, 2368359562UL); /* 32 */  

  /* Round 3 */  
#define S31 4  
#define S32 11  
#define S33 16  
#define S34 23  
  HH ( a, b, c, d, in[ 5], S31, 4294588738UL); /* 33 */  
  HH ( d, a, b, c, in[ 8], S32, 2272392833UL); /* 34 */  
  HH ( c, d, a, b, in[11], S33, 1839030562UL); /* 35 */  
  HH ( b, c, d, a, in[14], S34, 4259657740UL); /* 36 */  
  HH ( a, b, c, d, in[ 1], S31, 2763975236UL); /* 37 */  
  HH ( d, a, b, c, in[ 4], S32, 1272893353UL); /* 38 */  
  HH ( c, d, a, b, in[ 7], S33, 4139469664UL); /* 39 */  
  HH ( b, c, d, a, in[10], S34, 3200236656UL); /* 40 */  
  HH ( a, b, c, d, in[13], S31,  681279174UL); /* 41 */  
  HH ( d, a, b, c, in[ 0], S32, 3936430074UL); /* 42 */  
  HH ( c, d, a, b, in[ 3], S33, 3572445317UL); /* 43 */  
  HH ( b, c, d, a, in[ 6], S34,   76029189UL); /* 44 */  
  HH ( a, b, c, d, in[ 9], S31, 3654602809UL); /* 45 */  
  HH ( d, a, b, c, in[12], S32, 3873151461UL); /* 46 */  
  HH ( c, d, a, b, in[15], S33,  530742520UL); /* 47 */  
  HH ( b, c, d, a, in[ 2], S34, 3299628645UL); /* 48 */  

  /* Round 4 */  
#define S41 6  
#define S42 10  
#define S43 15  
#define S44 21  
  II ( a, b, c, d, in[ 0], S41, 4096336452UL); /* 49 */  
  II ( d, a, b, c, in[ 7], S42, 1126891415UL); /* 50 */  
  II ( c, d, a, b, in[14], S43, 2878612391UL); /* 51 */  
  II ( b, c, d, a, in[ 5], S44, 4237533241UL); /* 52 */  
  II ( a, b, c, d, in[12], S41, 1700485571UL); /* 53 */  
  II ( d, a, b, c, in[ 3], S42, 2399980690UL); /* 54 */  
  II ( c, d, a, b, in[10], S43, 4293915773UL); /* 55 */  
  II ( b, c, d, a, in[ 1], S44, 2240044497UL); /* 56 */  
  II ( a, b, c, d, in[ 8], S41, 1873313359UL); /* 57 */  
  II ( d, a, b, c, in[15], S42, 4264355552UL); /* 58 */  
  II ( c, d, a, b, in[ 6], S43, 2734768916UL); /* 59 */  
  II ( b, c, d, a, in[13], S44, 1309151649UL); /* 60 */  
  II ( a, b, c, d, in[ 4], S41, 4149444226UL); /* 61 */  
  II ( d, a, b, c, in[11], S42, 3174756917UL); /* 62 */  
  II ( c, d, a, b, in[ 2], S43,  718787259UL); /* 63 */  
  II ( b, c, d, a, in[ 9], S44, 3951481745UL); /* 64 */  

  buf[0] += a;  
  buf[1] += b;  
  buf[2] += c;  
  buf[3] += d;  
}  


/**
 *        计算指定字符串的md5值
 *@data            待MD5的数据
 *@datalen        待md5数据的长度
 *@md5Value        OUT MD计算结果
 *@md5ValueMax    md5Value缓冲区大小(
                                     如果小于16字节,则返回失败;
                                     如果小区32字节则返回16字节的编码;
                                     如果大于等于32字节,则返回32字节的bcd编码)
 *@return        成功返回md5Value的使用字节数
 *                失败返回 -1
 *@notes        一般情况下,MD5的结果为16或32字节,32字节为16字节的bcd编码。
 */
int Md5(BYTE* data,int datalen,BYTE* md5Value,int md5ValueMax)
{
    _MD5_CTX mdContext;

    Md5Init(&mdContext);
    Md5Update(&mdContext, data, datalen);
    Md5Final(&mdContext);


    if(md5ValueMax < 16)//容量不够 
    {
        return -1;
    }
    else if(md5ValueMax < 32)  //如果小于32
    {  
        for (int i=0;i<16;i++)
        {
            md5Value[i] = mdContext.digest[i];
        }
        return 16;
    }  
    else
    {  
        for(int i=0; i<16; i++)  
        {  
            sprintf((char*)&md5Value[i*2], "%02x", mdContext.digest[i]);  
        }
        return 32;
    }  

    return -1;
}

/* 
 ********************************************************************** 
 ** End of md5.c                                                     ** 
 ******************************* (cut) ******************************** 
 */ 
/**
 *        计算指定文件的md5值
 *@pcFilePath        待计算MD5的文件路径
 *@md5Value        OUT MD计算结果
 *@md5ValueMax    md5Value缓冲区大小(
                                如果小于16字节,则返回失败;
                                如果小区32字节则返回16字节的编码;
                                如果大于等于32字节,则返回32字节的bcd编码)
 *@return        成功返回md5Value的使用字节数
 *                失败返回 -1
 *@notes        一般情况下,MD5的结果为16或32字节,32字节为16字节的bcd编码。
 */
int CalcFileMd5(char* pcFilePath,BYTE* md5Value,int md5ValueMax)
{  
    FILE *fp = fopen (pcFilePath, "rb");
    _MD5_CTX mdContext;  
    int bytes;  
    BYTE data[1024];  

    if (fp == NULL) 
    {  
        return -1;  
    }  

    Md5Init (&mdContext);  
    while ((bytes = fread (data, 1, 1024, fp)) != 0)  
    {  
        Md5Update (&mdContext, data, bytes);  
    }  
    Md5Final (&mdContext);  
    fclose(fp);


    if(md5ValueMax < 16)//容量不够 
    {
        return -1;
    }
    else if(md5ValueMax < 32)  //如果小于32
    {  
        for (int i=0;i<16;i++)
        {
            md5Value[i] = mdContext.digest[i];
        }
        return 16;
    }  
    else
    {  
        for(int i=0; i<16; i++)  
        {  
            sprintf((char*)&md5Value[i*2], "%02x", mdContext.digest[i]);  
        }
        return 32;
    }  

    return -1;
}


/**
 *        随机数Md5加密
 *@plaintext        加密前的明文
 *@plaintextLen        明文长度
 *@randtext            随机内容
 *@randtextLen        随机内容长度
 *@encryption        存放密文的空间
 *@encryptionMax    密文空间最大容量
 *@return            成功返回加密后的内容长度
 *                    失败返回 -1
 */
int RandMd5(char* plaintext,int plaintextLen,char* randtext,int randtextLen,char* encryption,int encryptionMax)
{
    for (int i=0;i<plaintextLen;i++)
    {
        plaintext[i] = plaintext[i] ^ randtext[i%randtextLen];
    }

    return Md5((BYTE*)plaintext,plaintextLen,(BYTE*)encryption,encryptionMax);
}

md5Test.cpp

// Md5Test.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <Md5.h>
#include <string.h>
#include <stdlib.h>

int main(int argc, char* argv[])
{
    char *data    = "12345678";
    char R[]    ={'1','2','3','4'};
    char md5[_MD5_MAX + 1];
    char md5_2[_MD5_MAX + 1];

    memset(md5,0,sizeof(md5));
    Md5((BYTE*)data.GetBuffer(0),data.GetLength(),(BYTE*)md5,_MD5_MAX);

    printf("md5:%s\n",md5);

    memset(md5_2,0,sizeof(md5_2));
    for (int i=0;i<_MD5_MAX;i++)
    {
        md5[i] = md5[i]^(R[i%4]);
    }

    Md5((BYTE*)md5,_MD5_MAX,(BYTE*)md5_2,_MD5_MAX);
    printf("md5_2:%s\n",md5_2);

    getchar();
    return 0;
}

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