MD5 via JS

21 07 2009

Par generar el MD5 de una cadena de texto, se puede utilizar el siguiente código (Lo encontré jugando con mi módem):

<!--
	var hex_chr = "0123456789abcdef";
	function rhex(num)
	{
		var str = "";

  		for(var j = 0; j <= 3; j++)
	    	str += hex_chr.charAt((num >> (j * 8 + 4)) & 0x0F) + hex_chr.charAt((num >> (j * 8)) & 0x0F);

  		return str;
	}

	function str2blks_MD5(str)
	{
  		var nblk = ((str.length + 8) >> 6) + 1;
  		var blks = new Array(nblk * 16);

  		for(var i = 0; i < nblk * 16; i++) blks&#91;i&#93; = 0;
  		for(i = 0; i < str.length; i++)
    		blks&#91;i >> 2&#93; |= str.charCodeAt(i) << ((i % 4) * 8);

  		blks&#91;i >> 2&#93; |= 0x80 << ((i % 4) * 8);
  		blks&#91;nblk * 16 - 2&#93; = str.length * 8;

  		return blks;
	}

	function add(x, y)
	{
  		return ((x&0x7FFFFFFF) + (y&0x7FFFFFFF)) ^ (x&0x80000000) ^ (y&0x80000000);
	}

	function rol(num, cnt)
	{
  		return (num << cnt) | (num >>> (32 - cnt));
	}

	function cmn(q, a, b, x, s, t)
	{
  		return add(rol(add(add(a, q), add(x, t)), s), b);
	}

	function ff(a, b, c, d, x, s, t)
	{
  		return cmn((b & c) | ((~b) & d), a, b, x, s, t);
	}

	function gg(a, b, c, d, x, s, t)
	{
  		return cmn((b & d) | (c & (~d)), a, b, x, s, t);
	}

	function hh(a, b, c, d, x, s, t)
	{
  		return cmn(b ^ c ^ d, a, b, x, s, t);
	}

	function ii(a, b, c, d, x, s, t)
	{
  		return cmn(c ^ (b | (~d)), a, b, x, s, t);
	}

	function calcMD5(str)
	{
  		var x = str2blks_MD5(str);
  		var a = 0x67452301;
  		var b = 0xEFCDAB89;
  		var c = 0x98BADCFE;
  		var d = 0x10325476;

  		for(var i = 0; i < x.length; i += 16)
  		{
    		var olda = a;
    		var oldb = b;
    		var oldc = c;
    		var oldd = d;

    		a = ff(a, b, c, d, x&#91;i+ 0&#93;, 7 , 0xD76AA478);
    		d = ff(d, a, b, c, x&#91;i+ 1&#93;, 12, 0xE8C7B756);
    		c = ff(c, d, a, b, x&#91;i+ 2&#93;, 17, 0x242070DB);
    		b = ff(b, c, d, a, x&#91;i+ 3&#93;, 22, 0xC1BDCEEE);
    		a = ff(a, b, c, d, x&#91;i+ 4&#93;, 7 , 0xF57C0FAF);
    		d = ff(d, a, b, c, x&#91;i+ 5&#93;, 12, 0x4787C62A);
    		c = ff(c, d, a, b, x&#91;i+ 6&#93;, 17, 0xA8304613);
    		b = ff(b, c, d, a, x&#91;i+ 7&#93;, 22, 0xFD469501);
    		a = ff(a, b, c, d, x&#91;i+ 8&#93;, 7 , 0x698098D8);
    		d = ff(d, a, b, c, x&#91;i+ 9&#93;, 12, 0x8B44F7AF);
    		c = ff(c, d, a, b, x&#91;i+10&#93;, 17, 0xFFFF5BB1);
    		b = ff(b, c, d, a, x&#91;i+11&#93;, 22, 0x895CD7BE);
    		a = ff(a, b, c, d, x&#91;i+12&#93;, 7 , 0x6B901122);
    		d = ff(d, a, b, c, x&#91;i+13&#93;, 12, 0xFD987193);
    		c = ff(c, d, a, b, x&#91;i+14&#93;, 17, 0xA679438E);
    		b = ff(b, c, d, a, x&#91;i+15&#93;, 22, 0x49B40821);

    		a = gg(a, b, c, d, x&#91;i+ 1&#93;, 5 , 0xF61E2562);
    		d = gg(d, a, b, c, x&#91;i+ 6&#93;, 9 , 0xC040B340);
    		c = gg(c, d, a, b, x&#91;i+11&#93;, 14, 0x265E5A51);
    		b = gg(b, c, d, a, x&#91;i+ 0&#93;, 20, 0xE9B6C7AA);
    		a = gg(a, b, c, d, x&#91;i+ 5&#93;, 5 , 0xD62F105D);
    		d = gg(d, a, b, c, x&#91;i+10&#93;, 9 , 0x02441453);
    		c = gg(c, d, a, b, x&#91;i+15&#93;, 14, 0xD8A1E681);
    		b = gg(b, c, d, a, x&#91;i+ 4&#93;, 20, 0xE7D3FBC8);
    		a = gg(a, b, c, d, x&#91;i+ 9&#93;, 5 , 0x21E1CDE6);
    		d = gg(d, a, b, c, x&#91;i+14&#93;, 9 , 0xC33707D6);
    		c = gg(c, d, a, b, x&#91;i+ 3&#93;, 14, 0xF4D50D87);
    		b = gg(b, c, d, a, x&#91;i+ 8&#93;, 20, 0x455A14ED);
    		a = gg(a, b, c, d, x&#91;i+13&#93;, 5 , 0xA9E3E905);
    		d = gg(d, a, b, c, x&#91;i+ 2&#93;, 9 , 0xFCEFA3F8);
    		c = gg(c, d, a, b, x&#91;i+ 7&#93;, 14, 0x676F02D9);
    		b = gg(b, c, d, a, x&#91;i+12&#93;, 20, 0x8D2A4C8A);

    		a = hh(a, b, c, d, x&#91;i+ 5&#93;, 4 , 0xFFFA3942);
    		d = hh(d, a, b, c, x&#91;i+ 8&#93;, 11, 0x8771F681);
    		c = hh(c, d, a, b, x&#91;i+11&#93;, 16, 0x6D9D6122);
    		b = hh(b, c, d, a, x&#91;i+14&#93;, 23, 0xFDE5380C);
    		a = hh(a, b, c, d, x&#91;i+ 1&#93;, 4 , 0xA4BEEA44);
    		d = hh(d, a, b, c, x&#91;i+ 4&#93;, 11, 0x4BDECFA9);
    		c = hh(c, d, a, b, x&#91;i+ 7&#93;, 16, 0xF6BB4B60);
    		b = hh(b, c, d, a, x&#91;i+10&#93;, 23, 0xBEBFBC70);
    		a = hh(a, b, c, d, x&#91;i+13&#93;, 4 , 0x289B7EC6);
    		d = hh(d, a, b, c, x&#91;i+ 0&#93;, 11, 0xEAA127FA);
    		c = hh(c, d, a, b, x&#91;i+ 3&#93;, 16, 0xD4EF3085);
    		b = hh(b, c, d, a, x&#91;i+ 6&#93;, 23, 0x04881D05);
    		a = hh(a, b, c, d, x&#91;i+ 9&#93;, 4 , 0xD9D4D039);
    		d = hh(d, a, b, c, x&#91;i+12&#93;, 11, 0xE6DB99E5);
    		c = hh(c, d, a, b, x&#91;i+15&#93;, 16, 0x1FA27CF8);
    		b = hh(b, c, d, a, x&#91;i+ 2&#93;, 23, 0xC4AC5665);

    		a = ii(a, b, c, d, x&#91;i+ 0&#93;, 6 , 0xF4292244);
    		d = ii(d, a, b, c, x&#91;i+ 7&#93;, 10, 0x432AFF97);
    		c = ii(c, d, a, b, x&#91;i+14&#93;, 15, 0xAB9423A7);
    		b = ii(b, c, d, a, x&#91;i+ 5&#93;, 21, 0xFC93A039);
    		a = ii(a, b, c, d, x&#91;i+12&#93;, 6 , 0x655B59C3);
    		d = ii(d, a, b, c, x&#91;i+ 3&#93;, 10, 0x8F0CCC92);
    		c = ii(c, d, a, b, x&#91;i+10&#93;, 15, 0xFFEFF47D);
    		b = ii(b, c, d, a, x&#91;i+ 1&#93;, 21, 0x85845DD1);
    		a = ii(a, b, c, d, x&#91;i+ 8&#93;, 6 , 0x6FA87E4F);
    		d = ii(d, a, b, c, x&#91;i+15&#93;, 10, 0xFE2CE6E0);
    		c = ii(c, d, a, b, x&#91;i+ 6&#93;, 15, 0xA3014314);
    		b = ii(b, c, d, a, x&#91;i+13&#93;, 21, 0x4E0811A1);
    		a = ii(a, b, c, d, x&#91;i+ 4&#93;, 6 , 0xF7537E82);
    		d = ii(d, a, b, c, x&#91;i+11&#93;, 10, 0xBD3AF235);
    		c = ii(c, d, a, b, x&#91;i+ 2&#93;, 15, 0x2AD7D2BB);
    		b = ii(b, c, d, a, x&#91;i+ 9&#93;, 21, 0xEB86D391);

    		a = add(a, olda);
    		b = add(b, oldb);
    		c = add(c, oldc);
    		d = add(d, oldd);
  		}
  		return rhex(a) + rhex(b) + rhex(c) + rhex(d);
	}

	function passwordMD5(str)
	{
		var MDstring = calcMD5(str);

		return MDstring;
	}

	function LoginClick( loginPassword,hiddenPassword)
	{
		var passwordStr = passwordMD5(loginPassword.value);
		hiddenPassword.value = passwordStr;
		return;
	}
// -->


Se llama a LoginClick(document.getElementById(‘a’).value,document.getElementById(‘b’).value);

donde a seria el ID del campo con el texto original y b el cmpo con el resultado

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