oRc4.js

(function (thiz) {
	
	var O = thiz.O;

	O.__.RC4 = {

	
	// adapted for O by Francesco Sullo
	    
		endecrypt: function (txt,key,N,dval) {
	
			function exc(v,a,b) {
				var t = v[a];
				v[a] = v[b];
				v[b] = t;
			}
	
			var num = [], sbox = [], b=0;
	
			for (var i=0;i<=255;i++) {
				sbox[i] = i;
				num[i] = key.charCodeAt(i % key.length);
			}
	
			// improvement (with some bugs - for example with N=5
			for (var u=0;u<N;u++) {
				for (var i=0;i<=255;i++) {
					b = (b + sbox[i] + num[i]) % 256;
					exc(sbox,i,b);
				}
			}
			//
	
			var k=0, j=0, ret = "", val;
			for (var i=0;i<txt.length;i++) {
				 k = (k + 1) % 256;
				 j = (j + sbox[k]) % 256;
				 exc(sbox,k,j);
				 val = txt.charCodeAt(i) ^ sbox[(sbox[k] + sbox[j]) % 256];
	
				// dval produces not-reversible numeric strings:
	
				 ret += dval ? val : String.fromCharCode(val);
			}
			return ret;
		}
	};


    O.expand({


            toFromRC4: function (str,key,rounds) {
                    return O.__.RC4.endecrypt(
                            str,
                            key,
                            rounds ? rounds : 1
                    );
            }


    });


    O.extend({


            toFromRC4: function (key,rounds) {
                    this.O = O.toFromRC4(
                            this.O.toString(),
                            key,
                            rounds
                    );
                    return this;
            }


    });

})(this);