通过advapi32.dll来实现MD5运算

#include <stdio.h>#include <conio.h>#include <windows.h>typedef struct {ULONG i[2];/* number of _bits_ handled mod 2^64 */ULONG buf[4];/* scratch buffer */unsigned char in[64];/* input buffer */unsigned char digest[16];/* actual digest after MD5Final call */} MD5_CTX;#define PROTO_LIST(list) listtypedef void (WINAPI* PMD5Init) PROTO_LIST((MD5_CTX *));typedef void (WINAPI* PMD5Update) PROTO_LIST((MD5_CTX *, const unsigned char *, unsigned int));typedef void (WINAPI* PMD5Final) PROTO_LIST((MD5_CTX *));PMD5InitMD5Init= NULL;PMD5UpdateMD5Update= NULL;PMD5FinalMD5Final= NULL;//功能：将数值转换为对应的十六进制ascii码，以便能够打印显示出来。const char *Hex2ASC(const BYTE *Hex, int Len){static char ASC[4096 * 2];for (int i=0; i<Len; i++){ASC[i * 2] = "0123456789ABCDEF"[Hex[i] >> 4];ASC[i * 2 + 1] = "0123456789ABCDEF"[Hex[i] & 0x0F];}ASC[i * 2] = '/0';return ASC;}int main(){unsigned char buf[] = "admin888";MD5_CTX ctx;HINSTANCE hDLL = LoadLibrary("advapi32.dll");if ( hDLL != NULL ){MD5Init = (PMD5Init)GetProcAddress(hDLL, "MD5Init");MD5Update = (PMD5Update)GetProcAddress(hDLL, "MD5Update");MD5Final = (PMD5Final)GetProcAddress(hDLL, "MD5Final");MD5Init(&ctx);MD5Update(&ctx, buf, sizeof(buf)-1);MD5Final(&ctx);FreeLibrary(hDLL);printf("/"%s/"的MD5值为：%s", buf,Hex2ASC(ctx.digest, 16));}getch();return 0;}