getSymmetricKeySize() public method

. If the key size is unknown, or this isn't a symmetric encryption algorithm, null is returned.
public getSymmetricKeySize ( ) : integer | null
return integer | null The number of bytes in the key.
 /**
  * @dataProvider symmetricKeySizeProvider
  */
 public function testGetSymmetricKeySize($keyType, $keySize)
 {
     $key = new XMLSecurityKey($keyType);
     $size = $key->getSymmetricKeySize();
     $this->assertEquals($keySize, $size, sprintf("Invalid keysize for key type %s. Was %d, should have been %d.", $keyType, $size, $keySize));
 }