public function testChipherMethod()
{
$rc4 = new Rc4(hex2bin('7a1fb3b37abe7247af7363e53ddc8aa5964575bc'), 256);
$res = $rc4->cipher(hex2bin('f80790cb1276fc0654686f6d61734dfc1570726573656e63652d313339313938353938312d32'), 0, 38);
$this->assertEquals(hex2bin('35be4eb77f495de73d952cc9c910041450114e12efbe1422ac85e021e15d9e26ca7689fea70b'), $res);
}
/**
* @param $buffer
* @param $macOffset
* @param $offset
* @param $length
* @return string
*/
public function EncodeMessage($buffer, $macOffset, $offset, $length)
{
$data = $this->rc4->cipher($buffer, $offset, $length);
$mac = $this->computeMac($data, $offset, $length);
return substr($data, 0, $macOffset) . substr($mac, 0, 4) . substr($data, $macOffset + 4);
}