/**
* @param Oxygen_Math_BigInteger $modulus
* @param Oxygen_Math_BigInteger $exponent
* @param string $data
* @param string $rawSignature
*
* @return bool
* @throws Oxygen_Exception
*/
private function rsaMatch(Oxygen_Math_BigInteger $modulus, Oxygen_Math_BigInteger $exponent, $data, $rawSignature)
{
$modulusLength = strlen($modulus->toBytes());
if ($modulusLength !== strlen($rawSignature)) {
throw new Oxygen_Exception(Oxygen_Exception::RSA_KEY_SIGNATURE_SIZE_INVALID);
}
$signature = new Oxygen_Math_BigInteger($rawSignature, 256);
$m2 = $this->rsavp1($signature, $exponent, $modulus);
if (strlen($m2->toBytes()) > $modulusLength) {
throw new Oxygen_Exception(Oxygen_Exception::RSA_KEY_MODULUS_SIZE_INVALID);
}
$em = str_pad($m2->toBytes(), $modulusLength, chr(0), STR_PAD_LEFT);
$em2 = $this->emsaPkcs1v15Encode($data, $modulusLength);
return Oxygen_Util::hashEquals($em, $em2);
}
