求个ＶＣ＋＋的ＭＤ５算法例子

你baidu：CMD5Checksum 网上有封好的类。

解决方案 »

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http://www.langfine.com/rsa_md5.htm这个还是很多的，给你找了一个，呵呵！
百度搜索下很多，只要是C/C++写的代码，VC都可以用。
Crypto++库有MD5的类
http://sourceforge.net/projects/cryptopp/
template <class T>
tchar_string get_checksum(tchar_string filename, T* checksum_algorithm)
{
char buf[2048];
memset(buf, 0, sizeof(buf));
std::ifstream src_file(filename.c_str(), std::ios::binary);
if (src_file.good()==false)
return wxT("");
do
{
src_file.read(buf, sizeof(buf));
if (src_file.gcount()>0)
{
checksum_algorithm->Update( (const byte*)buf, src_file.gcount());
}
} while (src_file.good());
checksum_algorithm->Final( (byte*)buf);
std::basic_stringstream<TCHAR> ss;
for (int i=0; i<checksum_algorithm->DigestSize(); i++)
{
ss << std::hex << std::uppercase << std::setfill(wxT('0'))
<< std::setw(2) << std::internal << ((int)buf[i]&0xff);
}
return ss.str();
}
using namespace CryptoPP;
Weak1::MD5 checksum;
get_checksum(filename.c_str(), &checksum)；
网上有很多的
我这里也是从网上找到的
给你看看吧！
＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
#include <stdio.h>
#include <string.h>
#include <stdlib.h>typedef struct {    unsigned int state[4];         unsigned int count[2];         unsigned char buffer[64];     } MD5Context; void MD5_Init(MD5Context * context);void MD5_Update(MD5Context * context, unsigned char * buf, int len);void MD5_Final(MD5Context * context, unsigned char digest[16]);#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 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) + (unsigned long int)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (unsigned long int)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + (unsigned long int)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (unsigned long int)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
static void MD5_Encode(unsigned char * output, unsigned int * input, 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);    }} static void MD5_Decode(unsigned int * output, unsigned char * input, int len){    unsigned int i, j;     for (i = 0, j = 0; j < len; i++, j += 4)    {       output[i] = ((unsigned int) input[j]) |           (((unsigned int) input[j + 1]) << 8) |           (((unsigned int) input[j + 2]) << 16) |           (((unsigned int) input[j + 3]) << 24);    }} static void MD5_Transform(unsigned int state[4], unsigned char block[64]){    unsigned int a = state[0], b = state[1], c = state[2], d = state[3], x[16];     MD5_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;     memset((char *)x, 0, sizeof(x));}
接上帖
＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
void MD5_Init(MD5Context * context){    context->count[0] = context->count[1] = 0;     context->state[0] = 0x67452301;    context->state[1] = 0xefcdab89;    context->state[2] = 0x98badcfe;    context->state[3] = 0x10325476;} void MD5_Update(MD5Context * context, unsigned char * buf, int len){    unsigned int i, index, partLen;     index = (unsigned int) ((context->count[0] >> 3) & 0x3F);     if ((context->count[0] += ((unsigned int) len << 3)) < ((unsigned int) len << 3))    context->count[1]++;    context->count[1] += ((unsigned int) len >> 29);     partLen = 64 - index;     if (len >= partLen)    {       memcpy((char *) &context->buffer[index], (char *) buf, partLen);       MD5_Transform(context->state, context->buffer);        for (i = partLen; i + 63 < len; i += 64)           MD5_Transform(context->state, &buf[i]);        index = 0;    }    else    {        i = 0;    }     memcpy((char *) &context->buffer[index], (char *) &buf[i], len - i);} void MD5_Final(MD5Context * context, unsigned char digest[16]){    unsigned char bits[8];    unsigned int index, padLen;     MD5_Encode(bits, context->count, 8);     index = (unsigned int) ((context->count[0] >> 3) & 0x3f);    padLen = (index < 56) ? (56 - index) : (120 - index);    MD5_Update(context, PADDING, padLen);     MD5_Update(context, bits, 8);     MD5_Encode(digest, context->state, 16);     memset((char *) context, 0, sizeof(*context));}void MD5_File (char * filename){    FILE *file;    MD5Context context;    unsigned char buff[16];    int i,len;    unsigned char buffer[0x0400];     if (!(file = fopen (filename, "rb")))       printf ("%s can't be opened\n", filename);    else    {       MD5_Init (&context);       while (len = fread (buffer, 1, 1024, file))           MD5_Update (&context, buffer, len);       MD5_Final(&context,buff);       fclose (file);       for(i=0;i<16;i++)       {           printf("%x",(buff[i] & 0xF0)>>4);           printf("%x",buff[i] & 0x0F);       }       printf("\n");    }}int main(){    int i =0,j,len,startTime,endTime;    MD5Context context;    unsigned char buff[16];       char * str1 = "";    char * str2 = "abc";    char * str3 = "message digest";    char * str4 = "abcdefghijklmnopqrstuvwxyz";    char * str5 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcde
fghijklmnopqrstuvwxyz0123456789";    char * str6 = "123456789012345678901234567890123456789012345678
90123456789012345678901234567890";       char str[7][100] =    {       "",       "a",       "abc",       "message digest",       "abcdefghijklmnopqrstuvwxyz",       "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",       "12345678901234567890123456789012345
678901234567890123456789012345678901234567890"    };    for(i=0;i<6;i++)    {       len = strlen(str[i]);       MD5_Init(&context);       MD5_Update(&context,(unsigned char *)str[i], len);       MD5_Final(&context,buff);       printf("MD5(\"%s\") = \n",str[i]);       for(j=0;j<16;j++)       {           printf("%x",(buff[j] & 0xF0)>>4);           printf("%x",buff[j] & 0x0F);       }       printf("\n***********************************************************\n");    }    printf("Wating...\n");    MD5_File("00.dat");    system("pause");    return 0;
}