/* ======================================================================

     	              --JavaScript Source File -- 

NAME: CipherText_II.js (Patent-Pending)

AUTHOR: Charles Prichard <greentv@paulbunyan.net>

For testing purposes only!!!
All other uses require writing!!!

REVISION/DATE: 02-05-01

PURPOSE: Text encryption.

NEW mask feature added to LEVEL_II cipher mode.

NEW user-friendly alphabetic key option not fully supported.

====================================================================== */
var USERMODE;
var MODE;
var r_key;
var att;
var offset;
var s_key;

var xString;
var xStr;

var _mask = new Array(9,29,19,6,13,5,24,25,19,7,21,9,3,30,10,15,19,18,22,19,8,18,30,0,11,2,27,27,15,27,0,15);

function newkey(){

	USERMODE = "NUMERIC";

	s_key = Make_shiftedKey();
	  
	offset = Math.floor(att/32);
}
function Encode(xString,cipher_key){
	
	xStr = cipher(xString,cipher_key);
    
	return xStr;
}
function Decode(xString,cipher_key){

	offset = -offset;
	
	xStr = cipher(xString,cipher_key);
    
	return xStr;
}
function cipher(xString,cipher_key){

	var xStr="";
  
	var newkey;

	var keylen = cipher_key.length;
	
   var i = xString.length % keylen;
     
	for(var cntr=0; cntr <= xString.length-1; cntr++){             
   
      if ((xString.charCodeAt(cntr) != 0x0d) && (xString.charCodeAt(cntr) != 0x0a)){

				 if (USERMODE == "NUMERIC"){ newkey = cipher_key.charCodeAt(i) - 0x1f;}
				 else { if (USERMODE == "ALPHABETIC"){ newkey = cipher_key.charCodeAt(i) - 0x3f;}
					}
      	    
         	xStr += String.fromCharCode(((newkey) ^ (xString.charCodeAt(cntr)-0x1f)+offset)+0x1f);
         
       }
         
       else if ((xString.charCodeAt(cntr) == 0x0d) || (xString.charCodeAt(cntr) == 0x0a)){
         
         	xStr += xString.charAt(cntr);
         
        }

     i++;
     
     if (i == keylen){i = 0;}                  
     }         

return (xStr);
}
function setAttribute(){

	att = 0x00;
	var keyval;

  	for (var i=0; i <= r_key.length-1; i++){
		
		keyval = r_key.charCodeAt(i) - 0x20;

  	att = att ^ keyval;
  }
	return att;
}
function Make_reverseKey(){
 
   var _keyArray = new Array();
	
	for(var i=0; i < r_key.length; i++){         
     
		_keyArray[i] = r_key.charAt(i);
   
	}
   
	_keyArray.reverse();

	return _keyArray.join("");
	
}
function Make_shiftedKey(){
	
	var shift = setAttribute();
	
	s_key = Make_reverseKey();

	if ((shift % 2) == 1){s_key = s_key.substring(1,s_key.length);}
	else {s_key = s_key.substring(0,s_key.length-1);}

   var element;
	for (var i=0; i <= (shift - 1) % s_key.length; i++){             
        	
        	element = s_key.substring(0,1);
        	
        	s_key = s_key.substring(1,s_key.length);

        	if (USERMODE = "NUMERIC"){
        		s_key = s_key + String.fromCharCode(_mask[element.charCodeAt(0) - 31] + 31);
        	}
        	else { if (USERMODE = "ALPHABETIC"){
				s_key = s_key + String.fromCharCode(_mask[element.charCodeAt(0) - 63] + 63);}
      		}
    }
    return s_key;
}