/**
* Static method to convert Key into an instance of RSAPublicKeyImpl or RSAPrivate(Crt)KeyImpl. If
* the key is not an RSA key or cannot be used, throw an InvalidKeyException.
*
* <p>Used by RSASignature and RSACipher.
*/
public static RSAKey toRSAKey(Key key) throws InvalidKeyException {
if ((key instanceof RSAPrivateKeyImpl)
|| (key instanceof RSAPrivateCrtKeyImpl)
|| (key instanceof RSAPublicKeyImpl)) {
return (RSAKey) key;
} else {
return (RSAKey) INSTANCE.engineTranslateKey(key);
}
}
