通過advapi32.dll來實現MD5運算

#include <stdio.h><br />#include <conio.h><br />#include <windows.h></p><p>typedef struct {<br />ULONG i[2];/* number of _bits_ handled mod 2^64 */<br />ULONG buf[4];/* scratch buffer */<br />unsigned char in[64];/* input buffer */<br />unsigned char digest[16];/* actual digest after MD5Final call */<br />} MD5_CTX;</p><p>#define PROTO_LIST(list) list<br />typedef void (WINAPI* PMD5Init) PROTO_LIST((MD5_CTX *));<br />typedef void (WINAPI* PMD5Update) PROTO_LIST((MD5_CTX *, const unsigned char *, unsigned int));<br />typedef void (WINAPI* PMD5Final) PROTO_LIST((MD5_CTX *));</p><p>PMD5InitMD5Init= NULL;<br />PMD5UpdateMD5Update= NULL;<br />PMD5FinalMD5Final= NULL;</p><p>//功能：將數值轉換為對應的十六進位ascii碼，以便能夠列印顯示出來。<br />const char *Hex2ASC(const BYTE *Hex, int Len)<br />{<br />static char ASC[4096 * 2];</p><p>for (int i=0; i<Len; i++)<br />{<br />ASC[i * 2] = "0123456789ABCDEF"[Hex[i] >> 4];<br />ASC[i * 2 + 1] = "0123456789ABCDEF"[Hex[i] & 0x0F];<br />}<br />ASC[i * 2] = '/0';</p><p>return ASC;<br />}</p><p>int main()<br />{<br />unsigned char buf[] = "admin888";</p><p>MD5_CTX ctx;</p><p>HINSTANCE hDLL = LoadLibrary("advapi32.dll");<br />if ( hDLL != NULL )<br />{<br />MD5Init = (PMD5Init)GetProcAddress(hDLL, "MD5Init");<br />MD5Update = (PMD5Update)GetProcAddress(hDLL, "MD5Update");<br />MD5Final = (PMD5Final)GetProcAddress(hDLL, "MD5Final");</p><p>MD5Init(&ctx);<br />MD5Update(&ctx, buf, sizeof(buf)-1);<br />MD5Final(&ctx);</p><p>FreeLibrary(hDLL);</p><p>printf("/"%s/"的MD5值為：%s", buf,Hex2ASC(ctx.digest, 16));<br />}</p><p>getch();<br />return 0;<br />}<br />