/*
 *  md5.js 1.0b 27/06/96
 *
 * Javascript implementation of the RSA Data Security, Inc. MD5
 * Message-Digest Algorithm.
 *
 * Copyright (c) 1996 Henri Torgemane. All Rights Reserved.
 *
 * Permission to use, copy, modify, and distribute this software
 * and its documentation for any purposes and without
 * fee is hereby granted provided that this copyright notice
 * appears in all copies.
 *
 * Of course, this soft is provided "as is" without express or implied
 * warranty of any kind.
 *
 *
 * Modified with german comments and some information about collisions.
 * (Ralf Mieke, ralf@miekenet.de, http://mieke.home.pages.de)
 *
 * Modified as a prototype.js-compatible class by (sk, klickTel AG, 09.06.2008)
 */

var md5Class = Class.create({

    array:function(n) {
        for(i=0;i<n;i++) this[i]=0;
        this.length=n;
    },



    /* Einige grundlegenden Funktionen müssen wegen
    * Javascript Fehlern umgeschrieben werden.
    * Man versuche z.B. 0xffffffff >> 4 zu berechnen..
    * Die nun verwendeten Funktionen sind zwar langsamer als die Originale,
    * aber sie funktionieren.
    */
    
    integer:function(n)
    {
        return n%(0xffffffff+1);
    },

    shr:function(a,b)
    {
        a=this.integer(a);
        b=this.integer(b);
        if (a-0x80000000>=0) {
            a=a%0x80000000;
            a>>=b;
            a+=0x40000000>>(b-1);
        } else
            a>>=b;
        return a;
    },

    shl1:function(a)
    {
        a=a%0x80000000;
        if (a&0x40000000==0x40000000)
        {
            a-=0x40000000;
            a*=2;
            a+=0x80000000;
        } else
            a*=2;
        return a;
    },

    shl:function(a,b)
    {
        a=this.integer(a);
        b=this.integer(b);
        for (var i=0;i<b;i++) a=this.shl1(a);
        return a;
    },

    and:function(a,b)
    {
        a=this.integer(a);
        b=this.integer(b);
        var t1=(a-0x80000000);
        var t2=(b-0x80000000);
        if (t1>=0)
            if (t2>=0)
            return ((t1&t2)+0x80000000);
            else
            return (t1&b);
        else
            if (t2>=0)
            return (a&t2);
            else
            return (a&b);
    },

    or:function(a,b) {
        a=this.integer(a);
        b=this.integer(b);
        var t1=(a-0x80000000);
        var t2=(b-0x80000000);
        if (t1>=0)
            if (t2>=0)
            return ((t1|t2)+0x80000000);
            else
            return ((t1|b)+0x80000000);
        else
            if (t2>=0)
            return ((a|t2)+0x80000000);
            else
            return (a|b);
    },

    xor:function(a,b)
    {
        a=this.integer(a);
        b=this.integer(b);
        var t1=(a-0x80000000);
        var t2=(b-0x80000000);
        if (t1>=0)
            if (t2>=0)
            return (t1^t2);
            else
            return ((t1^b)+0x80000000);
        else
            if (t2>=0)
            return ((a^t2)+0x80000000);
            else
            return (a^b);
    },

    not:function(a)
    {
        a=this.integer(a);
        return (0xffffffff-a);
    },

    initialize:function()
    {
        /* Beginn des Algorithmus */
    
        this.state = new Array(4);
        this.count = new Array(2);
        this.count[0] = 0;
        this.count[1] = 0;
        this.buffer = new Array(64);
        this.transformBuffer = new Array(16);
        this.digestBits = new Array(16);
    
        this.S11 = 7;
        this.S12 = 12;
        this.S13 = 17;
        this.S14 = 22;
        this.S21 = 5;
        this.S22 = 9;
        this.S23 = 14;
        this.S24 = 20;
        this.S31 = 4;
        this.S32 = 11;
        this.S33 = 16;
        this.S34 = 23;
        this.S41 = 6;
        this.S42 = 10;
        this.S43 = 15;
        this.S44 = 21;

        this.ascii="01234567890123456789012345678901" +
          " !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ"+
          "[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~";
    },

    F:function(x,y,z) {
        return this.or(this.and(x,y),this.and(this.not(x),z));
    },

    G:function(x,y,z) {
        return this.or(this.and(x,z),this.and(y,this.not(z)));
    },

    H:function(x,y,z) {
        return this.xor(this.xor(x,y),z);
    },

    I:function(x,y,z) {
        return this.xor(y, this.or(x, this.not(z)));
    },

    rotateLeft:function(a,n) {
        return this.or(this.shl(a, n),(this.shr(a,(32 - n))));
    },

    FF:function(a,b,c,d,x,s,ac) {
        a = a+this.F(b, c, d) + x + ac;
        a = this.rotateLeft(a, s);
        a = a+b;
        return a;
    },

    GG:function(a,b,c,d,x,s,ac) {
        a = a+this.G(b, c, d) +x + ac;
        a = this.rotateLeft(a, s);
        a = a+b;
        return a;
    },

    HH:function(a,b,c,d,x,s,ac) {
        a = a+this.H(b, c, d) + x + ac;
        a = this.rotateLeft(a, s);
        a = a+b;
        return a;
    },

    II:function(a,b,c,d,x,s,ac) {
        a = a+this.I(b, c, d) + x + ac;
        a = this.rotateLeft(a, s);
        a = a+b;
        return a;
    },

    transform:function(buf,offset) {
        var a=0, b=0, c=0, d=0;
        var x = this.transformBuffer;

        a = this.state[0];
        b = this.state[1];
        c = this.state[2];
        d = this.state[3];

        for (i = 0; i < 16; i++) {
            x[i] = this.and(buf[i*4+offset],0xff);
            for (j = 1; j < 4; j++) {
                x[i]+=this.shl(this.and(buf[i*4+j+offset] ,0xff), j * 8);
            }
        }

        /* Runde 1 */
        a = this.FF ( a, b, c, d, x[ 0], this.S11, 0xd76aa478); /* 1 */
        d = this.FF ( d, a, b, c, x[ 1], this.S12, 0xe8c7b756); /* 2 */
        c = this.FF ( c, d, a, b, x[ 2], this.S13, 0x242070db); /* 3 */
        b = this.FF ( b, c, d, a, x[ 3], this.S14, 0xc1bdceee); /* 4 */
        a = this.FF ( a, b, c, d, x[ 4], this.S11, 0xf57c0faf); /* 5 */
        d = this.FF ( d, a, b, c, x[ 5], this.S12, 0x4787c62a); /* 6 */
        c = this.FF ( c, d, a, b, x[ 6], this.S13, 0xa8304613); /* 7 */
        b = this.FF ( b, c, d, a, x[ 7], this.S14, 0xfd469501); /* 8 */
        a = this.FF ( a, b, c, d, x[ 8], this.S11, 0x698098d8); /* 9 */
        d = this.FF ( d, a, b, c, x[ 9], this.S12, 0x8b44f7af); /* 10 */
        c = this.FF ( c, d, a, b, x[10], this.S13, 0xffff5bb1); /* 11 */
        b = this.FF ( b, c, d, a, x[11], this.S14, 0x895cd7be); /* 12 */
        a = this.FF ( a, b, c, d, x[12], this.S11, 0x6b901122); /* 13 */
        d = this.FF ( d, a, b, c, x[13], this.S12, 0xfd987193); /* 14 */
        c = this.FF ( c, d, a, b, x[14], this.S13, 0xa679438e); /* 15 */
        b = this.FF ( b, c, d, a, x[15], this.S14, 0x49b40821); /* 16 */

        /* Runde 2 */
        a = this.GG ( a, b, c, d, x[ 1], this.S21, 0xf61e2562); /* 17 */
        d = this.GG ( d, a, b, c, x[ 6], this.S22, 0xc040b340); /* 18 */
        c = this.GG ( c, d, a, b, x[11], this.S23, 0x265e5a51); /* 19 */
        b = this.GG ( b, c, d, a, x[ 0], this.S24, 0xe9b6c7aa); /* 20 */
        a = this.GG ( a, b, c, d, x[ 5], this.S21, 0xd62f105d); /* 21 */
        d = this.GG ( d, a, b, c, x[10], this.S22,  0x2441453); /* 22 */
        c = this.GG ( c, d, a, b, x[15], this.S23, 0xd8a1e681); /* 23 */
        b = this.GG ( b, c, d, a, x[ 4], this.S24, 0xe7d3fbc8); /* 24 */
        a = this.GG ( a, b, c, d, x[ 9], this.S21, 0x21e1cde6); /* 25 */
        d = this.GG ( d, a, b, c, x[14], this.S22, 0xc33707d6); /* 26 */
        c = this.GG ( c, d, a, b, x[ 3], this.S23, 0xf4d50d87); /* 27 */
        b = this.GG ( b, c, d, a, x[ 8], this.S24, 0x455a14ed); /* 28 */
        a = this.GG ( a, b, c, d, x[13], this.S21, 0xa9e3e905); /* 29 */
        d = this.GG ( d, a, b, c, x[ 2], this.S22, 0xfcefa3f8); /* 30 */
        c = this.GG ( c, d, a, b, x[ 7], this.S23, 0x676f02d9); /* 31 */
        b = this.GG ( b, c, d, a, x[12], this.S24, 0x8d2a4c8a); /* 32 */

        /* Runde 3 */
        a = this.HH ( a, b, c, d, x[ 5], this.S31, 0xfffa3942); /* 33 */
        d = this.HH ( d, a, b, c, x[ 8], this.S32, 0x8771f681); /* 34 */
        c = this.HH ( c, d, a, b, x[11], this.S33, 0x6d9d6122); /* 35 */
        b = this.HH ( b, c, d, a, x[14], this.S34, 0xfde5380c); /* 36 */
        a = this.HH ( a, b, c, d, x[ 1], this.S31, 0xa4beea44); /* 37 */
        d = this.HH ( d, a, b, c, x[ 4], this.S32, 0x4bdecfa9); /* 38 */
        c = this.HH ( c, d, a, b, x[ 7], this.S33, 0xf6bb4b60); /* 39 */
        b = this.HH ( b, c, d, a, x[10], this.S34, 0xbebfbc70); /* 40 */
        a = this.HH ( a, b, c, d, x[13], this.S31, 0x289b7ec6); /* 41 */
        d = this.HH ( d, a, b, c, x[ 0], this.S32, 0xeaa127fa); /* 42 */
        c = this.HH ( c, d, a, b, x[ 3], this.S33, 0xd4ef3085); /* 43 */
        b = this.HH ( b, c, d, a, x[ 6], this.S34,  0x4881d05); /* 44 */
        a = this.HH ( a, b, c, d, x[ 9], this.S31, 0xd9d4d039); /* 45 */
        d = this.HH ( d, a, b, c, x[12], this.S32, 0xe6db99e5); /* 46 */
        c = this.HH ( c, d, a, b, x[15], this.S33, 0x1fa27cf8); /* 47 */
        b = this.HH ( b, c, d, a, x[ 2], this.S34, 0xc4ac5665); /* 48 */

        /* Runde 4 */
        a = this.II ( a, b, c, d, x[ 0], this.S41, 0xf4292244); /* 49 */
        d = this.II ( d, a, b, c, x[ 7], this.S42, 0x432aff97); /* 50 */
        c = this.II ( c, d, a, b, x[14], this.S43, 0xab9423a7); /* 51 */
        b = this.II ( b, c, d, a, x[ 5], this.S44, 0xfc93a039); /* 52 */
        a = this.II ( a, b, c, d, x[12], this.S41, 0x655b59c3); /* 53 */
        d = this.II ( d, a, b, c, x[ 3], this.S42, 0x8f0ccc92); /* 54 */
        c = this.II ( c, d, a, b, x[10], this.S43, 0xffeff47d); /* 55 */
        b = this.II ( b, c, d, a, x[ 1], this.S44, 0x85845dd1); /* 56 */
        a = this.II ( a, b, c, d, x[ 8], this.S41, 0x6fa87e4f); /* 57 */
        d = this.II ( d, a, b, c, x[15], this.S42, 0xfe2ce6e0); /* 58 */
        c = this.II ( c, d, a, b, x[ 6], this.S43, 0xa3014314); /* 59 */
        b = this.II ( b, c, d, a, x[13], this.S44, 0x4e0811a1); /* 60 */
        a = this.II ( a, b, c, d, x[ 4], this.S41, 0xf7537e82); /* 61 */
        d = this.II ( d, a, b, c, x[11], this.S42, 0xbd3af235); /* 62 */
        c = this.II ( c, d, a, b, x[ 2], this.S43, 0x2ad7d2bb); /* 63 */
        b = this.II ( b, c, d, a, x[ 9], this.S44, 0xeb86d391); /* 64 */

        this.state[0] +=a;
        this.state[1] +=b;
        this.state[2] +=c;
        this.state[3] +=d;

    },
    /* Mit der Initialisierung von Dobbertin:
       state[0] = 0x12ac2375;
       state[1] = 0x3b341042;
       state[2] = 0x5f62b97c;
       state[3] = 0x4ba763ed;
       gibt es eine Kollision:

       begin 644 Message1
       M7MH=JO6_>MG!X?!51$)W,CXV!A"=(!AR71,<X`Y-IIT9^Z&8L$2N'Y*Y:R.;
       39GIK9>TF$W()/MEHR%C4:G1R:Q"=
       `
       end

       begin 644 Message2
       M7MH=JO6_>MG!X?!51$)W,CXV!A"=(!AR71,<X`Y-IIT9^Z&8L$2N'Y*Y:R.;
       39GIK9>TF$W()/MEHREC4:G1R:Q"=
       `
       end
    */
    init:function() {
        this.count[0] = this.count[1] = 0;
        this.state[0] = 0x67452301;
        this.state[1] = 0xefcdab89;
        this.state[2] = 0x98badcfe;
        this.state[3] = 0x10325476;
        for (i = 0; i < this.digestBits.length; i++)
            this.digestBits[i] = 0;
    },

    update:function(b) {
        var index,i;

        index = this.and(this.shr(this.count[0],3) , 0x3f);
        if (this.count[0]<0xffffffff-7)
          this.count[0] += 8;
        else {
          this.count[1]++;
          this.count[0]-=0xffffffff+1;
          this.count[0]+=8;
        }
        this.buffer[index] = this.and(b,0xff);
        if (index  >= 63) {
            this.transform(this.buffer, 0);
        }
    },

    finish:function() {
        var bits = new Array(8);
        var        padding;
        var        i=0, index=0, padLen=0;

        for (i = 0; i < 4; i++) {
            bits[i] = this.and(this.shr(this.count[0],(i * 8)), 0xff);
        }
        for (i = 0; i < 4; i++) {
            bits[i+4]=this.and(this.shr(this.count[1],(i * 8)), 0xff);
        }
        index = this.and(this.shr(this.count[0], 3) ,0x3f);
        padLen = (index < 56) ? (56 - index) : (120 - index);
        padding = new Array(64);
        padding[0] = 0x80;
        for (i=0;i<padLen;i++)
          this.update(padding[i]);
        for (i=0;i<8;i++)
          this.update(bits[i]);

        for (i = 0; i < 4; i++) {
            for (j = 0; j < 4; j++) {
                this.digestBits[i*4+j] = this.and(this.shr(this.state[i], (j * 8)) , 0xff);
            }
        }
    },

    /* Ende des MD5 Algorithmus */
    hexa:function(n) {
        var hexa_h = "0123456789abcdef";
        var hexa_c = "";
        var hexa_m = n;
        for (hexa_i=0;hexa_i<8;hexa_i++) {
            hexa_c=hexa_h.charAt(Math.abs(hexa_m)%16)+hexa_c;
            hexa_m=Math.floor(hexa_m/16);
        }
        return hexa_c;
    },

    MD5:function(nachricht)
    {
        var l,s,k,ka,kb,kc,kd;
        
        this.init();
        for (k=0;k<nachricht.length;k++) {
            l=nachricht.charAt(k);
            this.update(this.ascii.lastIndexOf(l));
        }
        this.finish();
        ka=kb=kc=kd=0;
        for (i=0;i<4;i++) ka+=this.shl(this.digestBits[15-i], (i*8));
        for (i=4;i<8;i++) kb+=this.shl(this.digestBits[15-i], ((i-4)*8));
        for (i=8;i<12;i++) kc+=this.shl(this.digestBits[15-i], ((i-8)*8));
        for (i=12;i<16;i++) kd+=this.shl(this.digestBits[15-i], ((i-12)*8));
        s=this.hexa(kd)+this.hexa(kc)+this.hexa(kb)+this.hexa(ka);
        return s;
    }

});