/* RC4 symmetric cipher encryption/decryption
 * Copyright (c) 2006 by Ali Farhadi.
 * released under the terms of the Gnu Public License.
 * see the GPL for details.
 *
 * Email: ali[at]farhadi[dot]ir
 * Website: http://farhadi.ir/
 */

/**
 * Encrypt given plain text using the key with RC4 algorithm.
 * All parameters and return value are in binary format.
 *
 * @param string key - secret key for encryption
 * @param string pt - plain text to be encrypted
 * @return string
 */
function rc4Encrypt(key, pt) {
	s = new Array();
	for (var i=0; i<256; i++) {
		s[i] = i;
	}
	var j = 0;
	var x;
	for (i=0; i<256; i++) {
		j = (j + s[i] + key.charCodeAt(i % key.length)) % 256;
		x = s[i];
		s[i] = s[j];
		s[j] = x;
	}
	i = 0;
	j = 0;
	var ct = '';
	for (var y=0; y<pt.length; y++) {
		i = (i + 1) % 256;
		j = (j + s[i]) % 256;
		x = s[i];
		s[i] = s[j];
		s[j] = x;
		ct += String.fromCharCode(pt.charCodeAt(y) ^ s[(s[i] + s[j]) % 256]);
	}
	return ct;
}

/**
 * Decrypt given cipher text using the key with RC4 algorithm.
 * All parameters and return value are in binary format.
 *
 * @param string key - secret key for decryption
 * @param string ct - cipher text to be decrypted
 * @return string
*/
function rc4Decrypt(key, ct) {
	return rc4Encrypt(key, ct);
}