/*
 * Chroma-Hash : A sexy, non-reversable live visualization of password field input
 * http://github.com/mattt/Chroma-Hash/
 *
 * Copyright (c) 2009 Mattt Thompson
 * Licensed under the MIT licenses.
 *
 * adapted for prototype by Wolfgang Kinkeldei, 2009
 */
var ChromaHash = Class.create({
    initialize: function(element, options) {
        var defaults = {
            number: 3
        };
        Object.extend(defaults, options);
        element = $(element);
        
        var bars = [];
        ["primary", "secondary", "tertiary", "quaternary"]
        .slice(0, defaults.number)
        .each(function(c) {
            var cHash = new Element('label', 
                                    {'for':   element.identify(),
                                     'class': c + ' chroma-hash'});
            bars.push(cHash);
            element.insert({after: cHash});
        });
        
        element.observe('keyup', this.drawBars.bindAsEventListener(this));
        
        this._options = options;
        this._bars = bars;
        this._element = element;
    },
    
    drawBars: function(e) {
        if ($F(this._element) == '') {
            this._bars.each(function(hash) {
                hash.setStyle({backgroundColor: '#ffffff'}).hide();
            });
        } else {
            var md5 = hex_md5($F(this._element));
            var colors = md5.match(/([\dABCDEF]{6})/ig);
            var offset = this._element.positionedOffset();
            var w = this._element.getWidth();
            var h = this._element.getHeight();
            this._bars.each(function(hash, index) {
                hash.setStyle({
                    position: 'absolute',
                    left: (offset[0] + w - 10*index - 10) + 'px',
                    top: offset[1] + 'px',
                    height: h + 'px',
                    width: '10px',
                    backgroundColor: '#' + colors[index]
                }).show();
            });
        }
        /*
         * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
         * Digest Algorithm, as defined in RFC 1321.
         * Version 2.2 Copyright (C) Paul Johnston 1999 - 2009
         * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
         * Distributed under the BSD License
         * See http://pajhome.org.uk/crypt/md5 for more info.
        */
        var hexcase=0;var b64pad="";
        function hex_md5(A){return rstr2hex(rstr_md5(str2rstr_utf8(A)));}
        function b64_md5(A){return rstr2b64(rstr_md5(str2rstr_utf8(A)));}
        function any_md5(A,B){return rstr2any(rstr_md5(str2rstr_utf8(A)),B);}
        function hex_hmac_md5(A,B){return rstr2hex(rstr_hmac_md5(str2rstr_utf8(A),str2rstr_utf8(B)));}
        function b64_hmac_md5(A,B){return rstr2b64(rstr_hmac_md5(str2rstr_utf8(A),str2rstr_utf8(B)));}
        function any_hmac_md5(A,C,B){return rstr2any(rstr_hmac_md5(str2rstr_utf8(A),str2rstr_utf8(C)),B);}
        function md5_vm_test(){return hex_md5("abc").toLowerCase()=="900150983cd24fb0d6963f7d28e17f72";}
        function rstr_md5(A){return binl2rstr(binl_md5(rstr2binl(A),A.length*8));}
        function rstr_hmac_md5(C,F){var E=rstr2binl(C);if(E.length>16){E=binl_md5(E,C.length*8);}var A=Array(16),D=Array(16);for(var B=0;B<16;B++){A[B]=E[B]^909522486;D[B]=E[B]^1549556828;}
        var G=binl_md5(A.concat(rstr2binl(F)),512+F.length*8);return binl2rstr(binl_md5(D.concat(G),512+128));}
        function rstr2hex(C){try{hexcase;}catch(F){hexcase=0;}var E=hexcase?"0123456789ABCDEF":"0123456789abcdef";var B="";var A;
        for(var D=0;D<C.length;D++){A=C.charCodeAt(D);B+=E.charAt((A>>>4)&15)+E.charAt(A&15);}return B;}
        function rstr2b64(C){try{b64pad;}catch(G){b64pad="";}var F="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";var B="";var A=C.length;
        for(var E=0;E<A;E+=3){var H=(C.charCodeAt(E)<<16)|(E+1<A?C.charCodeAt(E+1)<<8:0)|(E+2<A?C.charCodeAt(E+2):0);for(var D=0;D<4;D++){if(E*8+D*6>C.length*8){B+=b64pad;}else{B+=F.charAt((H>>>6*(3-D))&63);}}}return B;}
        function rstr2any(K,C){var B=C.length;var J,F,A,L,E;var I=Array(Math.ceil(K.length/2));for(J=0;J<I.length;J++){I[J]=(K.charCodeAt(J*2)<<8)|K.charCodeAt(J*2+1);}
        var H=Math.ceil(K.length*8/(Math.log(C.length)/Math.log(2)));var G=Array(H);for(F=0;F<H;F++){E=Array();L=0;for(J=0;J<I.length;J++){L=(L<<16)+I[J];
            A=Math.floor(L/B);L-=A*B;if(E.length>0||A>0){E[E.length]=A;}}G[F]=L;I=E;}var D="";for(J=G.length-1;J>=0;J--){D+=C.charAt(G[J]);}return D;}
        function str2rstr_utf8(C){var B="";var D=-1;var A,E;while(++D<C.length){A=C.charCodeAt(D);E=D+1<C.length?C.charCodeAt(D+1):0;
            if(55296<=A&&A<=56319&&56320<=E&&E<=57343){A=65536+((A&1023)<<10)+(E&1023);D++;}if(A<=127){B+=String.fromCharCode(A);}else{if(A<=2047){B+=String.fromCharCode(192|((A>>>6)&31),128|(A&63));}
            else{if(A<=65535){B+=String.fromCharCode(224|((A>>>12)&15),128|((A>>>6)&63),128|(A&63));}
            else{if(A<=2097151){B+=String.fromCharCode(240|((A>>>18)&7),128|((A>>>12)&63),128|((A>>>6)&63),128|(A&63));}}}}}return B;}
        function str2rstr_utf16le(B){var A="";for(var C=0;C<B.length;C++){A+=String.fromCharCode(B.charCodeAt(C)&255,(B.charCodeAt(C)>>>8)&255);}return A;}
        function str2rstr_utf16be(B){var A="";for(var C=0;C<B.length;C++){A+=String.fromCharCode((B.charCodeAt(C)>>>8)&255,B.charCodeAt(C)&255);}return A;}
        function rstr2binl(B){var A=Array(B.length>>2);for(var C=0;C<A.length;C++){A[C]=0;}for(var C=0;C<B.length*8;C+=8){A[C>>5]|=(B.charCodeAt(C/8)&255)<<(C%32);}return A;}
        function binl2rstr(B){var A="";for(var C=0;C<B.length*32;C+=8){A+=String.fromCharCode((B[C>>5]>>>(C%32))&255);}return A;}
        function binl_md5(K,F){K[F>>5]|=128<<((F)%32);K[(((F+64)>>>9)<<4)+14]=F;
            var J=1732584193;var I=-271733879;var H=-1732584194;var G=271733878;
            for(var C=0;C<K.length;C+=16){var E=J;var D=I;var B=H;var A=G;J=md5_ff(J,I,H,G,K[C+0],7,-680876936);
                G=md5_ff(G,J,I,H,K[C+1],12,-389564586);H=md5_ff(H,G,J,I,K[C+2],17,606105819);I=md5_ff(I,H,G,J,K[C+3],22,-1044525330);J=md5_ff(J,I,H,G,K[C+4],7,-176418897);
                G=md5_ff(G,J,I,H,K[C+5],12,1200080426);H=md5_ff(H,G,J,I,K[C+6],17,-1473231341);I=md5_ff(I,H,G,J,K[C+7],22,-45705983);J=md5_ff(J,I,H,G,K[C+8],7,1770035416);
                G=md5_ff(G,J,I,H,K[C+9],12,-1958414417);H=md5_ff(H,G,J,I,K[C+10],17,-42063);I=md5_ff(I,H,G,J,K[C+11],22,-1990404162);J=md5_ff(J,I,H,G,K[C+12],7,1804603682);
                G=md5_ff(G,J,I,H,K[C+13],12,-40341101);H=md5_ff(H,G,J,I,K[C+14],17,-1502002290);I=md5_ff(I,H,G,J,K[C+15],22,1236535329);J=md5_gg(J,I,H,G,K[C+1],5,-165796510);
                G=md5_gg(G,J,I,H,K[C+6],9,-1069501632);H=md5_gg(H,G,J,I,K[C+11],14,643717713);I=md5_gg(I,H,G,J,K[C+0],20,-373897302);J=md5_gg(J,I,H,G,K[C+5],5,-701558691);
                G=md5_gg(G,J,I,H,K[C+10],9,38016083);H=md5_gg(H,G,J,I,K[C+15],14,-660478335);I=md5_gg(I,H,G,J,K[C+4],20,-405537848);J=md5_gg(J,I,H,G,K[C+9],5,568446438);
                G=md5_gg(G,J,I,H,K[C+14],9,-1019803690);H=md5_gg(H,G,J,I,K[C+3],14,-187363961);I=md5_gg(I,H,G,J,K[C+8],20,1163531501);J=md5_gg(J,I,H,G,K[C+13],5,-1444681467);
                G=md5_gg(G,J,I,H,K[C+2],9,-51403784);H=md5_gg(H,G,J,I,K[C+7],14,1735328473);I=md5_gg(I,H,G,J,K[C+12],20,-1926607734);J=md5_hh(J,I,H,G,K[C+5],4,-378558);
                G=md5_hh(G,J,I,H,K[C+8],11,-2022574463);H=md5_hh(H,G,J,I,K[C+11],16,1839030562);I=md5_hh(I,H,G,J,K[C+14],23,-35309556);J=md5_hh(J,I,H,G,K[C+1],4,-1530992060);
                G=md5_hh(G,J,I,H,K[C+4],11,1272893353);H=md5_hh(H,G,J,I,K[C+7],16,-155497632);I=md5_hh(I,H,G,J,K[C+10],23,-1094730640);J=md5_hh(J,I,H,G,K[C+13],4,681279174);
                G=md5_hh(G,J,I,H,K[C+0],11,-358537222);H=md5_hh(H,G,J,I,K[C+3],16,-722521979);I=md5_hh(I,H,G,J,K[C+6],23,76029189);J=md5_hh(J,I,H,G,K[C+9],4,-640364487);
                G=md5_hh(G,J,I,H,K[C+12],11,-421815835);H=md5_hh(H,G,J,I,K[C+15],16,530742520);I=md5_hh(I,H,G,J,K[C+2],23,-995338651);J=md5_ii(J,I,H,G,K[C+0],6,-198630844);
                G=md5_ii(G,J,I,H,K[C+7],10,1126891415);H=md5_ii(H,G,J,I,K[C+14],15,-1416354905);I=md5_ii(I,H,G,J,K[C+5],21,-57434055);J=md5_ii(J,I,H,G,K[C+12],6,1700485571);
                G=md5_ii(G,J,I,H,K[C+3],10,-1894986606);H=md5_ii(H,G,J,I,K[C+10],15,-1051523);I=md5_ii(I,H,G,J,K[C+1],21,-2054922799);J=md5_ii(J,I,H,G,K[C+8],6,1873313359);
                G=md5_ii(G,J,I,H,K[C+15],10,-30611744);H=md5_ii(H,G,J,I,K[C+6],15,-1560198380);I=md5_ii(I,H,G,J,K[C+13],21,1309151649);J=md5_ii(J,I,H,G,K[C+4],6,-145523070);
                G=md5_ii(G,J,I,H,K[C+11],10,-1120210379);H=md5_ii(H,G,J,I,K[C+2],15,718787259);I=md5_ii(I,H,G,J,K[C+9],21,-343485551);J=safe_add(J,E);I=safe_add(I,D);
                H=safe_add(H,B);G=safe_add(G,A);}return Array(J,I,H,G);}
        function md5_cmn(F,C,B,A,E,D){return safe_add(bit_rol(safe_add(safe_add(C,F),safe_add(A,D)),E),B);}
        function md5_ff(C,B,G,F,A,E,D){return md5_cmn((B&G)|((~B)&F),C,B,A,E,D);}
        function md5_gg(C,B,G,F,A,E,D){return md5_cmn((B&F)|(G&(~F)),C,B,A,E,D);}
        function md5_hh(C,B,G,F,A,E,D){return md5_cmn(B^G^F,C,B,A,E,D);}
        function md5_ii(C,B,G,F,A,E,D){return md5_cmn(G^(B|(~F)),C,B,A,E,D);}
        function safe_add(A,D){var C=(A&65535)+(D&65535);var B=(A>>16)+(D>>16)+(C>>16);return(B<<16)|(C&65535);}
        function bit_rol(A,B){return(A<<B)|(A>>>(32-B));}
    },
    
});