一段调用advapi32.dll中MD5函数的BCB代码-优快云博客

#ifndef TOOL_BOX
#define TOOL_BOX

extern "C"{
/* Data structure for MD5 (Message-Digest) computation */
typedef struct {
    unsigned long i[2]; /* number of _bits_ handled mod 2^64 */
    unsigned long buf[4]; /* scratch buffer */
    unsigned char in[64]; /* input buffer */
    unsigned char digest[16]; /* actual digest after MD5Final call */
} MD5_CTX;

__declspec(dllimport)  void __stdcall MD5Init(MD5_CTX *);
__declspec(dllimport)  void __stdcall MD5Update(MD5_CTX *, const unsigned char *, unsigned int);
__declspec(dllimport)  void __stdcall MD5Final(MD5_CTX *);


const char* MD5SUM(const char* pbuf, int len);

}
#endif

//-------------------------------------------------

#include "toolbox.h"
#pragma comment(lib,"advapi32.lib")

const char* MD5SUM(const char* pbuf, int len)
{
 MD5_CTX ctx;
 MD5Init(&ctx);
 MD5Update(&ctx,pbuf,len);
 MD5Final(&ctx);
 static char  ASC[32];
 int    i;

 for (i = 0; i < 16; i++)
 {
  ASC[i * 2] = "0123456789ABCDEF"[ctx.digest[i] >> 4];
  ASC[i * 2 + 1] = "0123456789ABCDEF"[ctx.digest[i] & 0x0F];
 }
 ASC[i * 2] = '\0';

 return ASC;
}