/*!
 * 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.
 */

Denbel.load( 'core.MD5' );

/**
 * Denbel.core.MD5 object
 * @return void
 */
Denbel.core.MD5 =
{
/*
 * Configurable variables. You may need to tweak these to be compatible with
 * the server-side, but the defaults work in most cases.
 */
    hexcase: 0, /* hex output format. 0 - lowercase; 1 - uppercase        */
    b64pad: '', /* base-64 pad character. "=" for strict RFC compliance   */
    chrsz: 8,   /* bits per input character. 8 - ASCII; 16 - Unicode      */
    
    /**
     * Generates a MD5 hash (HEX)
     * @param string value
     * @return string
     */
    calc: function( s )
    {
        return Denbel.core.MD5.binl2hex( Denbel.core.MD5.md5_core( Denbel.core.MD5.str2binl( s ), ( s.length * Denbel.core.MD5.chrsz ) ) );
    },
    
    /**
     * Generates MD5 hash (Base64)
     * @param string value
     * @return string
     */
    base64: function( s )
    {
        return Denbel.core.MD5.binl2b64( Denbel.core.MD5.md5_core( Denbel.core.MD5.str2binl( s, ( s.length * Denbel.core.MD5.chrsz ) ) ) );
    },
    
    /**
     * Generates MD5 hash (string)
     * @param string value
     * @param string
     */
    string: function( s )
    {
        return Denbel.core.MD5.binl2str( Denbel.core.MD5.md5_core( Denbel.core.MD5.str2binl( s, ( s.length * Denbel.core.MD5.chrsz ) ) ) );
    },
    
    /**
     * HEX mac MD5
     * @param string key
     * @param string data
     * @return string
     */
    hexMac: function( key, data )
    {
        return Denbel.core.MD5.binl2hex( Denbel.core.MD5.core_hmac_md5( key, data ) );
    },
    
    /**
     * Base64 mac MD5
     * @param string key
     * @param string data
     * @return string
     */
    base64Mac: function( key, data )
    {
        return Denbel.core.MD5.binl2b64( Denbel.core.MD5.core_hmac_md5( key, data ) );
    },
    
    /**
     * String mac MD5
     * @param string key
     * @param string data
     * @return string
     */
    stringMac: function( key, data )
    {
        return Denbel.core.MD5.binl2str( Denbel.core.MD5.core_hmac_md5( key, data ) );
    },
    
    /**
     * Calculate MD5 of an array of little-endian words, and a bit depth
     * @param Array
     * @param int bit depth
     * @return string
     */
    md5_core: 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;
	
	var olda = null;
	var oldb = null;
	var oldc = null;
	var oldd = null;
	
	for( var i = 0; i < x.length; i += 16 )
	{
	  olda = a;
	  oldb = b;
	  oldc = c;
	  oldd = d;
	
	  a = Denbel.core.MD5.md5_ff( a, b, c, d, x[i+ 0], 7, -680876936 );
	  d = Denbel.core.MD5.md5_ff( d, a, b, c, x[i+ 1], 12, -389564586 );
	  c = Denbel.core.MD5.md5_ff( c, d, a, b, x[i+ 2], 17,  606105819 );
	  b = Denbel.core.MD5.md5_ff( b, c, d, a, x[i+ 3], 22, -1044525330 );
	  a = Denbel.core.MD5.md5_ff( a, b, c, d, x[i+ 4], 7 , -176418897 );
	  d = Denbel.core.MD5.md5_ff( d, a, b, c, x[i+ 5], 12,  1200080426 );
	  c = Denbel.core.MD5.md5_ff( c, d, a, b, x[i+ 6], 17, -1473231341 );
	  b = Denbel.core.MD5.md5_ff( b, c, d, a, x[i+ 7], 22, -45705983 );
	  a = Denbel.core.MD5.md5_ff( a, b, c, d, x[i+ 8], 7 ,  1770035416 );
	  d = Denbel.core.MD5.md5_ff( d, a, b, c, x[i+ 9], 12, -1958414417 );
	  c = Denbel.core.MD5.md5_ff( c, d, a, b, x[i+10], 17, -42063 );
	  b = Denbel.core.MD5.md5_ff( b, c, d, a, x[i+11], 22, -1990404162 );
	  a = Denbel.core.MD5.md5_ff( a, b, c, d, x[i+12], 7 ,  1804603682 );
	  d = Denbel.core.MD5.md5_ff( d, a, b, c, x[i+13], 12, -40341101 );
	  c = Denbel.core.MD5.md5_ff( c, d, a, b, x[i+14], 17, -1502002290 );
	  b = Denbel.core.MD5.md5_ff( b, c, d, a, x[i+15], 22,  1236535329 );
	
	  a = Denbel.core.MD5.md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510);
	  d = Denbel.core.MD5.md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
	  c = Denbel.core.MD5.md5_gg(c, d, a, b, x[i+11], 14,  643717713);
	  b = Denbel.core.MD5.md5_gg(b, c, d, a, x[i+ 0], 20, -373897302);
	  a = Denbel.core.MD5.md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691);
	  d = Denbel.core.MD5.md5_gg(d, a, b, c, x[i+10], 9 ,  38016083);
	  c = Denbel.core.MD5.md5_gg(c, d, a, b, x[i+15], 14, -660478335);
	  b = Denbel.core.MD5.md5_gg(b, c, d, a, x[i+ 4], 20, -405537848);
	  a = Denbel.core.MD5.md5_gg(a, b, c, d, x[i+ 9], 5 ,  568446438);
	  d = Denbel.core.MD5.md5_gg(d, a, b, c, x[i+14], 9 , -1019803690);
	  c = Denbel.core.MD5.md5_gg(c, d, a, b, x[i+ 3], 14, -187363961);
	  b = Denbel.core.MD5.md5_gg(b, c, d, a, x[i+ 8], 20,  1163531501);
	  a = Denbel.core.MD5.md5_gg(a, b, c, d, x[i+13], 5 , -1444681467);
	  d = Denbel.core.MD5.md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784);
	  c = Denbel.core.MD5.md5_gg(c, d, a, b, x[i+ 7], 14,  1735328473);
	  b = Denbel.core.MD5.md5_gg(b, c, d, a, x[i+12], 20, -1926607734);
	
	  a = Denbel.core.MD5.md5_hh(a, b, c, d, x[i+ 5], 4 , -378558);
	  d = Denbel.core.MD5.md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463);
	  c = Denbel.core.MD5.md5_hh(c, d, a, b, x[i+11], 16,  1839030562);
	  b = Denbel.core.MD5.md5_hh(b, c, d, a, x[i+14], 23, -35309556);
	  a = Denbel.core.MD5.md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
	  d = Denbel.core.MD5.md5_hh(d, a, b, c, x[i+ 4], 11,  1272893353);
	  c = Denbel.core.MD5.md5_hh(c, d, a, b, x[i+ 7], 16, -155497632);
	  b = Denbel.core.MD5.md5_hh(b, c, d, a, x[i+10], 23, -1094730640);
	  a = Denbel.core.MD5.md5_hh(a, b, c, d, x[i+13], 4 ,  681279174);
	  d = Denbel.core.MD5.md5_hh(d, a, b, c, x[i+ 0], 11, -358537222);
	  c = Denbel.core.MD5.md5_hh(c, d, a, b, x[i+ 3], 16, -722521979);
	  b = Denbel.core.MD5.md5_hh(b, c, d, a, x[i+ 6], 23,  76029189);
	  a = Denbel.core.MD5.md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487);
	  d = Denbel.core.MD5.md5_hh(d, a, b, c, x[i+12], 11, -421815835);
	  c = Denbel.core.MD5.md5_hh(c, d, a, b, x[i+15], 16,  530742520);
	  b = Denbel.core.MD5.md5_hh(b, c, d, a, x[i+ 2], 23, -995338651);
	
	  a = Denbel.core.MD5.md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844);
	  d = Denbel.core.MD5.md5_ii(d, a, b, c, x[i+ 7], 10,  1126891415);
	  c = Denbel.core.MD5.md5_ii(c, d, a, b, x[i+14], 15, -1416354905);
	  b = Denbel.core.MD5.md5_ii(b, c, d, a, x[i+ 5], 21, -57434055);
	  a = Denbel.core.MD5.md5_ii(a, b, c, d, x[i+12], 6 ,  1700485571);
	  d = Denbel.core.MD5.md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606);
	  c = Denbel.core.MD5.md5_ii(c, d, a, b, x[i+10], 15, -1051523);
	  b = Denbel.core.MD5.md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799);
	  a = Denbel.core.MD5.md5_ii(a, b, c, d, x[i+ 8], 6 ,  1873313359);
	  d = Denbel.core.MD5.md5_ii(d, a, b, c, x[i+15], 10, -30611744);
	  c = Denbel.core.MD5.md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380);
	  b = Denbel.core.MD5.md5_ii(b, c, d, a, x[i+13], 21,  1309151649);
	  a = Denbel.core.MD5.md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070);
	  d = Denbel.core.MD5.md5_ii(d, a, b, c, x[i+11], 10, -1120210379);
	  c = Denbel.core.MD5.md5_ii(c, d, a, b, x[i+ 2], 15,  718787259);
	  b = Denbel.core.MD5.md5_ii(b, c, d, a, x[i+ 9], 21, -343485551);
	
	  a = Denbel.core.MD5.safe_add(a, olda);
	  b = Denbel.core.MD5.safe_add(b, oldb);
	  c = Denbel.core.MD5.safe_add(c, oldc);
	  d = Denbel.core.MD5.safe_add(d, oldd);
	}
	
	return new Array( a, b, c, d );
    },
    
    /**
     * md5_cnm
     */
    md5_cmn: function(q, a, b, x, s, t)
    {
        return Denbel.core.MD5.safe_add( Denbel.core.MD5.bit_rol( Denbel.core.MD5.safe_add( Denbel.core.MD5.safe_add( a, q ), Denbel.core.MD5.safe_add( x, t ) ), s ), b );
    },

    /**
     *
     */
    md5_ff: function(a, b, c, d, x, s, t)
{
  return Denbel.core.MD5.md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
},

/**
 *
 */
    md5_gg: function(a, b, c, d, x, s, t)
    {
        return Denbel.core.MD5.md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
    },
    
    /**
     *
     */
md5_hh: function(a, b, c, d, x, s, t)
{
  return Denbel.core.MD5.md5_cmn(b ^ c ^ d, a, b, x, s, t);
},

/**
 *
 */
md5_ii: function(a, b, c, d, x, s, t)
{
  return Denbel.core.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 = Denbel.core.MD5.str2binl( key );
  
  if( bkey.length > 16 )
  {
      bkey = Denbel.core.MD5.core_md5( bkey, key.length * Denbel.core.MD5.chrsz );
  }

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

  var hash = Denbel.core.MD5.core_md5( ipad.concat( str2binl( data ) ), 512 + data.length * Denbel.core.MD5.chrsz );
  return Denbel.core.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 chrsz is ASCII, characters >255 have their hi-byte silently ignored.
 */
str2binl: function( str )
{
  var bin = new Array();
  var mask = ( 1 << Denbel.core.MD5.chrsz ) - 1;
  
  for( var i = 0; i < str.length * Denbel.core.MD5.chrsz; i += Denbel.core.MD5.chrsz )
  {
        bin[i>>5] |= ( str.charCodeAt( i / Denbel.core.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 << Denbel.core.MD5.chrsz ) - 1;
  
  for( var i = 0; i < bin.length * 32; i += Denbel.core.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 = Denbel.core.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 += Denbel.core.MD5.b64pad;
      }
      else
      {
          str += tab.charAt( ( triplet >> 6 * ( 3 - j ) ) & 0x3F );
      }
    }
  }
  
  return str;
}
};