调用AdvApi32.dll中MD5算法的函数。

作者：zhaozj
发表时间：2020-12-23 10:38
来源：未知

在Win2000/XP的AdvApi32.dll中实现了基本的Hash和RSA算法，但微软没有给出函数和数据的定义。

下面演示MD5算法的调用。

#include <windows.h>

/* Data structure for MD5 (Message-Digest) computation */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 MD5DIGESTLEN 16

#define PROTO_LIST(list) list

/** MTS: Each of these assumes MD5_CTX is locked against simultaneous use.*/typedef 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 *));

PMD5Init MD5Init = NULL;PMD5Update MD5Update = NULL;PMD5Final MD5Final = NULL;

const char *Hex2ASC(const BYTE *Hex, int Len){ static char ASC[4096 * 2]; int i; for (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(){ MD5_CTX ctx; unsigned char buf[4] = "1233"; HINSTANCE hDLL;

if ( (hDLL = LoadLibrary("advapi32.dll")) > 0 ) { MD5Init = (PMD5Init)GetProcAddress(hDLL,"MD5Init"); MD5Update = (PMD5Update)GetProcAddress(hDLL,"MD5Update"); MD5Final = (PMD5Final)GetProcAddress(hDLL,"MD5Final");

MD5Init(&ctx); MD5Update(&ctx,buf,4); MD5Final(&ctx);

printf(Hex2ASC(ctx.digest,16));

} return 0;}

是不是很简单呢。另外AdvApi32.Dll中还有其他的一些算法如RSA，DSA，SHA等，

以上代码在WinXP SP1/vc6.0 下调试通过