<?php
class RC4Crypt {
	public static function encrypt_ ($pwd, $data, $ispwdHex = 0){
			if ($ispwdHex)
					$pwd = @pack('H*', $pwd);

			$key[] = '';
			$box[] = '';
			$cipher = '';
			$pwd_length = strlen($pwd);
			$data_length = strlen($data);

			for ($i = 0; $i < 256; $i++){
					$key[$i] = ord($pwd[$i % $pwd_length]);
					$box[$i] = $i;
			}
			for ($j = $i = 0; $i < 256; $i++){
					$j = ($j + $box[$i] + $key[$i]) % 256;
					$tmp = $box[$i];
					$box[$i] = $box[$j];
					$box[$j] = $tmp;
			}
			for ($a = $j = $i = 0; $i < $data_length; $i++){
					$a = ($a + 1) % 256;
					$j = ($j + $box[$a]) % 256;
					$tmp = $box[$a];
					$box[$a] = $box[$j];
					$box[$j] = $tmp;
					$k = $box[(($box[$a] + $box[$j]) % 256)];
					$cipher .= chr(ord($data[$i]) ^ $k);
			}
			return $cipher;
	}
	public static function decrypt_ ($pwd, $data, $ispwdHex = 0){
			return RC4Crypt::encrypt_($pwd, $data, $ispwdHex);
	}
}
function encrypt($string, $key){
	return base64_encode(bin2hex(RC4Crypt::encrypt_($key, $string)));
} 
function decrypt($string, $key){
	return RC4Crypt::decrypt_($key,  hex2bin(base64_decode($string)));
}
?>