JavaScript编写MD5加密

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JavaScript

JavaScript MD5加密

一介绍

MD5是Message-Digest Algorithm 5即信息-摘要算法5，是在计算机语言当中普遍使用的一种杂凑程序，由于类似于函数，这里称为算法。

MD5算法由MD2、MD3和MD4完善而来。它的基本原理是将一个字符串或汉字等，通过使用函数转换为另一种新的字符串，并且这种运算不可逆转。

MD5算法的公开性和安全性，因此被广泛使用在各种程序语言中。

MD5算法已经被各种语言实现。例如ASP、PHP、JAVA、C、C#、VB、VC++、Delpli等语言。

MD5算法以16个32位子分组即512位分组来提供数据杂凑，经过程序流程，生成4个32位数据，最后联合起来成为一个128位散列。

基本方式为：求余、取余、调整长度、与链接变量进行循环运算。

二 JavaScript编写MD5加密

本应用使用JavaScript实现了MD5加密算法，在页面文本框中输入需要加密的信息后，单击加密按钮将会弹出通过MD5算法加密后的字符串。

三代码

<script language="javascript"> 
function MD5(sMessage)
{
	function RotateLeft(lValue, iShiftBits)
 	{ 
  		return (lValue<<iShiftBits) | (lValue>>>(32-iShiftBits)); 
 	}
	function AddUnsigned(lX,lY)
 	{
		var lX4,lY4,lX8,lY8,lResult;
		lX8 = (lX & 0x80000000);
		lY8 = (lY & 0x80000000);
		lX4 = (lX & 0x40000000);
		lY4 = (lY & 0x40000000);
		lResult = (lX & 0x3FFFFFFF)+(lY & 0x3FFFFFFF);
		if (lX4 & lY4) return (lResult ^ 0x80000000 ^ lX8 ^ lY8);
		if (lX4 | lY4)
   		{
   			if (lResult & 0x40000000) return (lResult ^ 0xC0000000 ^ lX8 ^ lY8);
   			else return (lResult ^ 0x40000000 ^ lX8 ^ lY8);
   		}
  		else return (lResult ^ lX8 ^ lY8);
	}
	function F(x,y,z) { return (x & y) | ((~x) & z); }
	function G(x,y,z) { return (x & z) | (y & (~z)); }
	function H(x,y,z) { return (x ^ y ^ z); }
	function I(x,y,z) { return (y ^ (x | (~z))); }
	function FF(a,b,c,d,x,s,ac)
	{
	  a = AddUnsigned(a, AddUnsigned(AddUnsigned(F(b, c, d), x), ac));
	  return AddUnsigned(RotateLeft(a, s), b);
	}
	function GG(a,b,c,d,x,s,ac)
	{
	  a = AddUnsigned(a, AddUnsigned(AddUnsigned(G(b, c, d), x), ac));
	  return AddUnsigned(RotateLeft(a, s), b);
	}
	function HH(a,b,c,d,x,s,ac)
	{
	  a = AddUnsigned(a, AddUnsigned(AddUnsigned(H(b, c, d), x), ac));
	  return AddUnsigned(RotateLeft(a, s), b);
	}
	function II(a,b,c,d,x,s,ac)
	{
	  a = AddUnsigned(a, AddUnsigned(AddUnsigned(I(b, c, d), x), ac));
	  return AddUnsigned(RotateLeft(a, s), b);
	}
	function ConvertToWordArray(sMessage)
	{
	  var lWordCount;
	  var lMessageLength = sMessage.length;
	  var lNumberOfWords_temp1=lMessageLength + 8;
	  var lNumberOfWords_temp2=(lNumberOfWords_temp1-(lNumberOfWords_temp1 % 64))/64;
	  var lNumberOfWords = (lNumberOfWords_temp2+1)*16;
	  var lWordArray=Array(lNumberOfWords-1);
	  var lBytePosition = 0;
	  var lByteCount = 0;
	  while ( lByteCount < lMessageLength )
	  {
	   lWordCount = (lByteCount-(lByteCount % 4))/4;
	   lBytePosition = (lByteCount % 4)*8;
	   lWordArray[lWordCount] = (lWordArray[lWordCount] | (sMessage.charCodeAt(lByteCount)<<lBytePosition));
	   lByteCount++;
	  }
	  lWordCount = (lByteCount-(lByteCount % 4))/4;
	  lBytePosition = (lByteCount % 4)*8;
	  lWordArray[lWordCount] = lWordArray[lWordCount] | (0x80<<lBytePosition);
	  lWordArray[lNumberOfWords-2] = lMessageLength<<3;
	  lWordArray[lNumberOfWords-1] = lMessageLength>>>29;
	  return lWordArray;
	}
	function WordToHex(lValue)
	{
	  var WordToHexValue="",WordToHexValue_temp="",lByte,lCount;
	  for (lCount = 0;lCount<=3;lCount++) 
	  {
	   	lByte = (lValue>>>(lCount*8)) & 255;
	   	WordToHexValue_temp = "0" + lByte.toString(16);
	   	WordToHexValue = WordToHexValue + WordToHexValue_temp.substr(WordToHexValue_temp.length-2,2);
	  }
	  return WordToHexValue;
	}
	var x=Array();
	var k,AA,BB,CC,DD,a,b,c,d
	var S11=7, S12=12, S13=17, S14=22;
	var S21=5, S22=9 , S23=14, S24=20;
	var S31=4, S32=11, S33=16, S34=23;
	var S41=6, S42=10, S43=15, S44=21;
	x = ConvertToWordArray(sMessage);
	a = 0x67452301; b = 0xEFCDAB89; c = 0x98BADCFE; d = 0x10325476;
	for (k=0;k<x.length;k+=16)
	{
	    AA=a; BB=b; CC=c; DD=d;
	    a=FF(a,b,c,d,x[k+0], S11,0xD76AA478);
	    d=FF(d,a,b,c,x[k+1], S12,0xE8C7B756);
	    c=FF(c,d,a,b,x[k+2], S13,0x242070DB);
	    b=FF(b,c,d,a,x[k+3], S14,0xC1BDCEEE);
	    a=FF(a,b,c,d,x[k+4], S11,0xF57C0FAF);
	    d=FF(d,a,b,c,x[k+5], S12,0x4787C62A);
	    c=FF(c,d,a,b,x[k+6], S13,0xA8304613);
	    b=FF(b,c,d,a,x[k+7], S14,0xFD469501);
	    a=FF(a,b,c,d,x[k+8], S11,0x698098D8);
	    d=FF(d,a,b,c,x[k+9], S12,0x8B44F7AF);
	    c=FF(c,d,a,b,x[k+10],S13,0xFFFF5BB1);
	    b=FF(b,c,d,a,x[k+11],S14,0x895CD7BE);
	    a=FF(a,b,c,d,x[k+12],S11,0x6B901122);
	    d=FF(d,a,b,c,x[k+13],S12,0xFD987193);
	    c=FF(c,d,a,b,x[k+14],S13,0xA679438E);
	    b=FF(b,c,d,a,x[k+15],S14,0x49B40821);
	
	    a=GG(a,b,c,d,x[k+1], S21,0xF61E2562);
	    d=GG(d,a,b,c,x[k+6], S22,0xC040B340);
	    c=GG(c,d,a,b,x[k+11],S23,0x265E5A51);
	    b=GG(b,c,d,a,x[k+0], S24,0xE9B6C7AA);
	    a=GG(a,b,c,d,x[k+5], S21,0xD62F105D);
	    d=GG(d,a,b,c,x[k+10],S22,0x2441453);
	    c=GG(c,d,a,b,x[k+15],S23,0xD8A1E681);
	    b=GG(b,c,d,a,x[k+4], S24,0xE7D3FBC8);
	    a=GG(a,b,c,d,x[k+9], S21,0x21E1CDE6);
	    d=GG(d,a,b,c,x[k+14],S22,0xC33707D6);
	    c=GG(c,d,a,b,x[k+3], S23,0xF4D50D87);
	    b=GG(b,c,d,a,x[k+8], S24,0x455A14ED);
	    a=GG(a,b,c,d,x[k+13],S21,0xA9E3E905);
	    d=GG(d,a,b,c,x[k+2], S22,0xFCEFA3F8);
	    c=GG(c,d,a,b,x[k+7], S23,0x676F02D9);
	    b=GG(b,c,d,a,x[k+12],S24,0x8D2A4C8A);
	
	    a=HH(a,b,c,d,x[k+5], S31,0xFFFA3942);
	    d=HH(d,a,b,c,x[k+8], S32,0x8771F681);
	    c=HH(c,d,a,b,x[k+11],S33,0x6D9D6122);
	    b=HH(b,c,d,a,x[k+14],S34,0xFDE5380C);
	    a=HH(a,b,c,d,x[k+1], S31,0xA4BEEA44);
	    d=HH(d,a,b,c,x[k+4], S32,0x4BDECFA9);
	    c=HH(c,d,a,b,x[k+7], S33,0xF6BB4B60);
	    b=HH(b,c,d,a,x[k+10],S34,0xBEBFBC70);
	    a=HH(a,b,c,d,x[k+13],S31,0x289B7EC6);
	    d=HH(d,a,b,c,x[k+0], S32,0xEAA127FA);
	    c=HH(c,d,a,b,x[k+3], S33,0xD4EF3085);
	    b=HH(b,c,d,a,x[k+6], S34,0x4881D05);
	    a=HH(a,b,c,d,x[k+9], S31,0xD9D4D039);
	    d=HH(d,a,b,c,x[k+12],S32,0xE6DB99E5);
	    c=HH(c,d,a,b,x[k+15],S33,0x1FA27CF8);
	    b=HH(b,c,d,a,x[k+2], S34,0xC4AC5665);
	
	    a=II(a,b,c,d,x[k+0], S41,0xF4292244);
	    d=II(d,a,b,c,x[k+7], S42,0x432AFF97);
	    c=II(c,d,a,b,x[k+14],S43,0xAB9423A7);
	    b=II(b,c,d,a,x[k+5], S44,0xFC93A039);
	    a=II(a,b,c,d,x[k+12],S41,0x655B59C3);
	    d=II(d,a,b,c,x[k+3], S42,0x8F0CCC92);
	    c=II(c,d,a,b,x[k+10],S43,0xFFEFF47D);
	    b=II(b,c,d,a,x[k+1], S44,0x85845DD1);
	    a=II(a,b,c,d,x[k+8], S41,0x6FA87E4F);
	    d=II(d,a,b,c,x[k+15],S42,0xFE2CE6E0);
	    c=II(c,d,a,b,x[k+6], S43,0xA3014314);
	    b=II(b,c,d,a,x[k+13],S44,0x4E0811A1);
	    a=II(a,b,c,d,x[k+4], S41,0xF7537E82);
	    d=II(d,a,b,c,x[k+11],S42,0xBD3AF235);
	    c=II(c,d,a,b,x[k+2], S43,0x2AD7D2BB);
	    b=II(b,c,d,a,x[k+9], S44,0xEB86D391);
	
	    a=AddUnsigned(a,AA); b=AddUnsigned(b,BB); c=AddUnsigned(c,CC); d=AddUnsigned(d,DD);
	}
    var temp= WordToHex(a)+WordToHex(b)+WordToHex(c)+WordToHex(d);
    return temp.toLowerCase();
}
document.write(MD5("hello"));
</script>

四运行结果

5d41402abc4b2a76b9719d911017c592

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