@Override
        protected void engineInit(
                int opmode, Key key, AlgorithmParameterSpec spec, SecureRandom random)
                throws InvalidKeyException, InvalidAlgorithmParameterException {
            if (spec != null && !(spec instanceof OAEPParameterSpec)) {
                throw new InvalidAlgorithmParameterException(
                        "Only OAEPParameterSpec accepted in OAEP mode");
            }

            engineInitInternal(opmode, key, spec);
        }
Returns {@code true} if the cipher has been initialized.
common/src/main/java/org/conscrypt/OpenSSLCipherRSA.java