mddriver.c

汇编内核的md5算法

/* Copyright (C) 1990-2, RSA Data Security, Inc. Created 1990. All
rights reserved.

  RSA Data Security, Inc. makes no representations concerning either
  the merchantability of this software or the suitability of this
  software for any particular purpose. It is provided "as is"
  without express or implied warranty of any kind.
  
	These notices must be retained in any copies of any part of this
	documentation and/or software.
*/

#include <stdio.h>
#include <string.h>
#include <windows.h>
#include "md5.h"

static void MDPrint (unsigned char digest[16])
{
	
	unsigned int i;
	
	for (i = 0; i < 16; i++)
		printf ("%02x", digest[i]);
}

static void MD5String (char *string)
{
	MD5_CTX context;
	unsigned char digest[16];
	unsigned int len = strlen (string);
	
	MD5Init (&context);
	MD5Update (&context, string, len);
	MD5Final (digest, &context);
	
	printf ("MD5 (\"%s\") = ", string);
	MDPrint (digest);
	printf ("\n");
}

static void MD5File (char *filename)
{
	FILE *file;
	MD5_CTX context;
	int len;
	unsigned char buffer[1024], digest[16];
	
	if ((file = fopen (filename, "rb")) == NULL)
	{
		printf ("%s can't be opened\n", filename);
	}
	else 
	{
		MD5Init (&context);
		while (len = fread (buffer, 1, 1024, file))
			MD5Update (&context, buffer, len);
		MD5Final (digest, &context);
		
		fclose (file);
		
		printf ("MD5 (%s) = ", filename);
		MDPrint (digest);
		printf ("\n");
	}
}

int main()
{
	char all_chars[] = "0123456789";
	char tmp[128];
	int spacelen = strlen(all_chars);
	int pwlen = 8;
	char *tmpspace[8+1];
	int i;
	unsigned char digest[16];

	MD5_CTX context;
	DWORD dwTime = GetTickCount();
	
	memset(tmp, '\0', sizeof(tmp));
	
	tmpspace[0]=&all_chars[0];
	for (i=1; i<=pwlen; i++) {
		tmpspace[i]=0;
	}
	
	while(!tmpspace[pwlen]) {
		for (i=0; i<=pwlen; i++) {
			if(tmpspace[i] != 0)
				tmp[i]=*tmpspace[i];//构造一个新的字符串
			else 
				break;
		}
		
		MD5Init (&context);
		MD5Update (&context, (unsigned char*)tmp, strlen(tmp));
		MD5Final (digest, &context);
		
		tmpspace[0]++;//指针移动到标准数组的下一个,注意此处的tmpspace[0]只是一个简单的指针而已
		
		for (i=0; i<pwlen; i++) {
			if (tmpspace[i] > &all_chars[spacelen -1]) {
				tmpspace[i] = &all_chars[0];
				if (tmpspace[i+1] !=0)
					tmpspace[i+1]++;
				else
					tmpspace[i+1] = &all_chars[0];
			}//if
		}//for
	}
	
	dwTime = GetTickCount() - dwTime;
	printf("spend time: %d seconds\n",dwTime/1000);

	///////////////////////////////////////////////////////////////////////////////
	printf ("MD5 test suite:\n");
	
	MD5String ("");
	MD5String ("a");
	MD5String ("abc");
	MD5String ("message digest");
	MD5String ("abcdefghijklmnopqrstuvwxyz");
	MD5String
	("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789");
	
	MD5String
	("12345678901234567890123456789012345678901234567890123456789012345678901234567890");

	getchar();
	/*
	MD5 ("") = d41d8cd98f00b204e9800998ecf8427e
	MD5 ("a") = 0cc175b9c0f1b6a831c399e269772661
	MD5 ("abc") = 900150983cd24fb0d6963f7d28e17f72
	MD5 ("message digest") = f96b697d7cb7938d525a2f31aaf161d0
	MD5 ("abcdefghijklmnopqrstuvwxyz") = c3fcd3d76192e4007dfb496cca67e13b
	MD5 ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789") =
	d174ab98d277d9f5a5611c2c9f419d9f
	MD5 ("123456789012345678901234567890123456789012345678901234567890123456
	78901234567890") = 57edf4a22be3c955ac49da2e2107b67a
	*/  
}