/*
---
description: String MD5 hashing.

license: MIT-style

authors:
- Christopher Pitt

requires:
- core/1.2.4: String

provides: [String.toMD5]

...
*/

(function() {

    /**
    *
    * MD5 (Message-Digest Algorithm)
    * http://www.webtoolkit.info/
    *
    * Has undergone extensive reformatting and optimization!
    *
    **/
     
    function MD5(string)
    {
    	function RotateLeft(lValue, iShiftBits)
        {
    		return (lValue<<iShiftBits) | (lValue>>>(32-iShiftBits));
    	}
     
    	function AddUnsigned(lX,lY)
        {
    		var 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(string)
        {
    		var lWordCount,
                lMessageLength = string.length,
                lNumberOfWords_temp1 = lMessageLength + 8,
                lNumberOfWords_temp2 = (lNumberOfWords_temp1 - (lNumberOfWords_temp1 % 64)) / 64,
                lNumberOfWords = (lNumberOfWords_temp2 + 1) * 16,
                lWordArray = Array(lNumberOfWords - 1),
                lBytePosition = 0,
                lByteCount = 0;
            
    		while (lByteCount < lMessageLength)
            {
    			lWordCount = (lByteCount - (lByteCount % 4)) / 4;
    			lBytePosition = (lByteCount % 4) * 8;
    			lWordArray[lWordCount] = (lWordArray[lWordCount] | (string.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;
    	}
     
    	function Utf8Encode(string)
        {
    		string = string.replace(/\r\n/g,"\n");
    		var utftext = "";
     
    		for (var n = 0; n < string.length; n++)
            {
    			var c = string.charCodeAt(n);
     
    			if (c < 128)
                {
    				utftext += String.fromCharCode(c);
    			}
    			else if((c > 127) && (c < 2048))
                {
    				utftext += String.fromCharCode((c >> 6) | 192);
    				utftext += String.fromCharCode((c & 63) | 128);
    			}
    			else
                {
    				utftext += String.fromCharCode((c >> 12) | 224);
    				utftext += String.fromCharCode(((c >> 6) & 63) | 128);
    				utftext += String.fromCharCode((c & 63) | 128);
    			}
    		}
     
    		return utftext;
    	}
     
    	string = Utf8Encode(string);
        
    	var AA, BB, CC, DD,
            x = ConvertToWordArray(string),
            a = 0x67452301, b = 0xEFCDAB89,
            c = 0x98BADCFE, d = 0x10325476,
        	S11 = 7, S12 = 12, S13 = 17, S14 = 22,
        	S21 = 5, S22 = 9, S23 = 14, S24 = 20,
        	S31 = 4, S32 = 11, S33 = 16, S34 = 23,
        	S41 = 6, S42 = 10, S43 = 15, S44 = 21;
     
    	for (var 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);
    	}

    	return (WordToHex(a) + WordToHex(b) + WordToHex(c) + WordToHex(d)).toLowerCase();
    }
    
    String.implement({
        'toMD5': function()
        {
            return MD5(this);
        }
    });
    
})();