MD5 = {
    /*
    * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
    * Digest Algorithm, as defined in RFC 1321.
    * Version 2.1 Copyright (C) Paul Johnston 1999 - 2002.
    * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
    * Distributed under the BSD License
    * See http://pajhome.org.uk/crypt/md5 for more info.
    
    * Modified by Federico Lozada Mosto (April 2006)
    * Web: http://blog.3wstudio.com.ar    
    */
    
    /*
    * Configurable variables. You may need to tweak these to be compatible with
    * the server-side, but the defaults work in most cases.
    */
    hexcase: 0,
    b64pad: "",
    chrsz: 8,

    /*
    * These are the functions you'll usually want to call
    * They take string arguments and return either hex or base-64 encoded strings
    */
    hex_md5:function(s) { 
        return MD5.binl2hex(MD5.core_md5(MD5.str2binl(s), s.length * MD5.chrsz));
    },
    
    b64_md5:function(s){
        return MD5.binl2b64(MD5.core_md5(MD5.str2binl(s), s.length * MD5.chrsz));
    },
    
    str_md5:function(s){
        return MD5.binl2str(MD5.core_md5(MD5.str2binl(s), s.length * MD5.chrsz));
    },
    
    hex_hmac_md5:function(key, data) {
        return MD5.binl2hex(MD5.core_hmac_md5(key, data)); 
    },
    
    b64_hmac_md5:function(key, data) { 
        return MD5.binl2b64(MD5.core_hmac_md5(key, data)); 
    },
    
    str_hmac_md5:function(key, data) { 
        return MD5.binl2str(MD5.core_hmac_md5(key, data)); 
    },

    /*
    * Perform a simple self-test to see if the VM is working
    */
    md5_vm_test:function(){
        return MD5.hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72";
    },

    /*
    * Calculate the MD5 of an array of little-endian words, and a bit length
    */
    core_md5:function(x, len){
         /* append padding */
        x[len >> 5] |= 0x80 << ((len) % 32);
        x[(((len + 64) >>> 9) << 4) + 14] = len;
        
        var a =  1732584193;
        var b = -271733879;
        var c = -1732584194;
        var d =  271733878;
        
        for(var i = 0; i < x.length; i += 16){
            var olda = a;
            var oldb = b;
            var oldc = c;
            var oldd = d;
        
            a = MD5.md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936);
            d = MD5.md5_ff(d, a, b, c, x[i+ 1], 12, -389564586);
            c = MD5.md5_ff(c, d, a, b, x[i+ 2], 17,  606105819);
            b = MD5.md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330);
            a = MD5.md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897);
            d = MD5.md5_ff(d, a, b, c, x[i+ 5], 12,  1200080426);
            c = MD5.md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341);
            b = MD5.md5_ff(b, c, d, a, x[i+ 7], 22, -45705983);
            a = MD5.md5_ff(a, b, c, d, x[i+ 8], 7 ,  1770035416);
            d = MD5.md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417);
            c = MD5.md5_ff(c, d, a, b, x[i+10], 17, -42063);
            b = MD5.md5_ff(b, c, d, a, x[i+11], 22, -1990404162);
            a = MD5.md5_ff(a, b, c, d, x[i+12], 7 ,  1804603682);
            d = MD5.md5_ff(d, a, b, c, x[i+13], 12, -40341101);
            c = MD5.md5_ff(c, d, a, b, x[i+14], 17, -1502002290);
            b = MD5.md5_ff(b, c, d, a, x[i+15], 22,  1236535329);
        
            a = MD5.md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510);
            d = MD5.md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
            c = MD5.md5_gg(c, d, a, b, x[i+11], 14,  643717713);
            b = MD5.md5_gg(b, c, d, a, x[i+ 0], 20, -373897302);
            a = MD5.md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691);
            d = MD5.md5_gg(d, a, b, c, x[i+10], 9 ,  38016083);
            c = MD5.md5_gg(c, d, a, b, x[i+15], 14, -660478335);
            b = MD5.md5_gg(b, c, d, a, x[i+ 4], 20, -405537848);
            a = MD5.md5_gg(a, b, c, d, x[i+ 9], 5 ,  568446438);
            d = MD5.md5_gg(d, a, b, c, x[i+14], 9 , -1019803690);
            c = MD5.md5_gg(c, d, a, b, x[i+ 3], 14, -187363961);
            b = MD5.md5_gg(b, c, d, a, x[i+ 8], 20,  1163531501);
            a = MD5.md5_gg(a, b, c, d, x[i+13], 5 , -1444681467);
            d = MD5.md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784);
            c = MD5.md5_gg(c, d, a, b, x[i+ 7], 14,  1735328473);
            b = MD5.md5_gg(b, c, d, a, x[i+12], 20, -1926607734);
        
            a = MD5.md5_hh(a, b, c, d, x[i+ 5], 4 , -378558);
            d = MD5.md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463);
            c = MD5.md5_hh(c, d, a, b, x[i+11], 16,  1839030562);
            b = MD5.md5_hh(b, c, d, a, x[i+14], 23, -35309556);
            a = MD5.md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
            d = MD5.md5_hh(d, a, b, c, x[i+ 4], 11,  1272893353);
            c = MD5.md5_hh(c, d, a, b, x[i+ 7], 16, -155497632);
            b = MD5.md5_hh(b, c, d, a, x[i+10], 23, -1094730640);
            a = MD5.md5_hh(a, b, c, d, x[i+13], 4 ,  681279174);
            d = MD5.md5_hh(d, a, b, c, x[i+ 0], 11, -358537222);
            c = MD5.md5_hh(c, d, a, b, x[i+ 3], 16, -722521979);
            b = MD5.md5_hh(b, c, d, a, x[i+ 6], 23,  76029189);
            a = MD5.md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487);
            d = MD5.md5_hh(d, a, b, c, x[i+12], 11, -421815835);
            c = MD5.md5_hh(c, d, a, b, x[i+15], 16,  530742520);
            b = MD5.md5_hh(b, c, d, a, x[i+ 2], 23, -995338651);
        
            a = MD5.md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844);
            d = MD5.md5_ii(d, a, b, c, x[i+ 7], 10,  1126891415);
            c = MD5.md5_ii(c, d, a, b, x[i+14], 15, -1416354905);
            b = MD5.md5_ii(b, c, d, a, x[i+ 5], 21, -57434055);
            a = MD5.md5_ii(a, b, c, d, x[i+12], 6 ,  1700485571);
            d = MD5.md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606);
            c = MD5.md5_ii(c, d, a, b, x[i+10], 15, -1051523);
            b = MD5.md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799);
            a = MD5.md5_ii(a, b, c, d, x[i+ 8], 6 ,  1873313359);
            d = MD5.md5_ii(d, a, b, c, x[i+15], 10, -30611744);
            c = MD5.md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380);
            b = MD5.md5_ii(b, c, d, a, x[i+13], 21,  1309151649);
            a = MD5.md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070);
            d = MD5.md5_ii(d, a, b, c, x[i+11], 10, -1120210379);
            c = MD5.md5_ii(c, d, a, b, x[i+ 2], 15,  718787259);
            b = MD5.md5_ii(b, c, d, a, x[i+ 9], 21, -343485551);
        
            a = MD5.safe_add(a, olda);
            b = MD5.safe_add(b, oldb);
            c = MD5.safe_add(c, oldc);
            d = MD5.safe_add(d, oldd);
        }
        return Array(a, b, c, d);
    },

    /*
    * These functions implement the four basic operations the algorithm uses.
    */
    md5_cmn:function(q, a, b, x, s, t){
        return MD5.safe_add(MD5.bit_rol(MD5.safe_add(MD5.safe_add(a, q), MD5.safe_add(x, t)), s),b);
    },
    
    md5_ff:function(a, b, c, d, x, s, t){
        return MD5.md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
    },
    
    md5_gg:function(a, b, c, d, x, s, t){
        return MD5.md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
    },
    
    md5_hh:function(a, b, c, d, x, s, t){
        return MD5.md5_cmn(b ^ c ^ d, a, b, x, s, t);
    },
    
    md5_ii:function(a, b, c, d, x, s, t){
        return MD5.md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
    },

    /*
    * Calculate the HMAC-MD5, of a key and some data
    */
    core_hmac_md5:function(key, data){
        var bkey = MD5.str2binl(key);
        if(bkey.length > 16) bkey = MD5.core_md5(bkey, key.length * MD5.chrsz);

        var ipad = Array(16), opad = Array(16);
        for(var i = 0; i < 16; i++){
            ipad[i] = bkey[i] ^ 0x36363636;
            opad[i] = bkey[i] ^ 0x5C5C5C5C;
        }

        var hash = MD5.core_md5(ipad.concat(MD5.str2binl(data)), 512 + data.length * MD5.chrsz);
        return MD5.core_md5(opad.concat(hash), 512 + 128);
    },

    /*
    * Add integers, wrapping at 2^32. This uses 16-bit operations internally
    * to work around bugs in some JS interpreters.
    */
    safe_add:function(x, y){
        var lsw = (x & 0xFFFF) + (y & 0xFFFF);
        var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
        return (msw << 16) | (lsw & 0xFFFF);
    },

    /*
    * Bitwise rotate a 32-bit number to the left.
    */
    bit_rol:function(num, cnt){
        return (num << cnt) | (num >>> (32 - cnt));
    },

    /*
    * Convert a string to an array of little-endian words
    * If MD5.chrsz is ASCII, characters >255 have their hi-byte silently ignored.
    */
    str2binl:function(str){
        var bin = Array();
        var mask = (1 << MD5.chrsz) - 1;
        for(var i = 0; i < str.length * MD5.chrsz; i += MD5.chrsz)
            bin[i>>5] |= (str.charCodeAt(i / MD5.chrsz) & mask) << (i%32);
        return bin;
    },

    /*
    * Convert an array of little-endian words to a string
    */
    binl2str:function(bin){
        var str = "";
        var mask = (1 << MD5.chrsz) - 1;
        for(var i = 0; i < bin.length * 32; i += MD5.chrsz)
            str += String.fromCharCode((bin[i>>5] >>> (i % 32)) & mask);
        return str;
    },

    /*
    * Convert an array of little-endian words to a hex string.
    */
    binl2hex:function(binarray){
        var hex_tab = MD5.hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
        var str = "";
        for(var i = 0; i < binarray.length * 4; i++){
            str += hex_tab.charAt((binarray[i>>2] >> ((i%4)*8+4)) & 0xF) +
            hex_tab.charAt((binarray[i>>2] >> ((i%4)*8  )) & 0xF);
        }
        return str;
    },

    /*
    * Convert an array of little-endian words to a base-64 string
    */
    binl2b64:function(binarray){
        var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
        var str = "";
        for(var i = 0; i < binarray.length * 4; i += 3){
            var triplet = (((binarray[i   >> 2] >> 8 * ( i   %4)) & 0xFF) << 16)
                        | (((binarray[i+1 >> 2] >> 8 * ((i+1)%4)) & 0xFF) << 8 )
                        |  ((binarray[i+2 >> 2] >> 8 * ((i+2)%4)) & 0xFF);
            for(var j = 0; j < 4; j++){
                if(i * 8 + j * 6 > binarray.length * 32) str += MD5.b64pad;
                else str += tab.charAt((triplet >> 6*(3-j)) & 0x3F);
            }
        }
        return str;
    }
}