calculatePublicKey method is not implemented by classes that extend PKCS8Key (which implements InternalPrivateKey) #366
Description
The PKCS8Key class implements the InternalPrivateKey interface that specifies the calculatePublicKey() method. This method, however, is not implemented by XDHPrivateKeyImpl or ECPrivateKey that extend PKCS8Key. Calling it throws and UnsupportedOperationException.