PrivateKey readPrivateKey()

in proton-j/src/main/java/org/apache/qpid/proton/engine/impl/ssl/SslEngineFacadeFactory.java [504:558]
45 lines of code
6 McCabe index (conditional complexity)

    PrivateKey readPrivateKey(String pemFile, String password)
    {
        if (bouncyCastleSetupException != null)
        {
            throw new TransportException("BouncyCastle failed to load", bouncyCastleSetupException);
        }

        final Object pemObject = readPemObject(pemFile);
        PrivateKey privateKey = null;

        try
        {
            Object keyConverter = JcaPEMKeyConverterCons.newInstance();
            setProvider(keyConverter, "BC");

            if (PEMEncryptedKeyPairClass.isInstance(pemObject))
            {
                Object decryptorBuilder = JcePEMDecryptorProviderBuilderCons.newInstance();

                // Build a PEMDecryptProvider
                Object decryptProvider = builderMethod.invoke(decryptorBuilder, password.toCharArray());

                Object decryptedKeyPair = decryptKeyPairMethod.invoke(pemObject, decryptProvider);
                KeyPair keyPair = (KeyPair) getKeyPairMethod.invoke(keyConverter, decryptedKeyPair);

                privateKey = keyPair.getPrivate();
            }
            else if (PEMKeyPairClass.isInstance(pemObject))
            {
                // It's a KeyPair but not encrypted.
                KeyPair keyPair = (KeyPair) getKeyPairMethod.invoke(keyConverter, pemObject);
                privateKey = keyPair.getPrivate();
            }
            else if (PrivateKeyInfoClass.isInstance(pemObject))
            {
                // It's an unencrypted private key
                privateKey = (PrivateKey) getPrivateKeyMethod.invoke(keyConverter, pemObject);
            }
            else
            {
                final String msg = "Unable to load PrivateKey, Unpexected Object [" + pemObject.getClass().getName()
                        + "]";
                _logger.log(Level.SEVERE, msg);
                throw new TransportException(msg);
            }
        }
        catch (InstantiationException | IllegalAccessException | IllegalArgumentException
                | InvocationTargetException | NoSuchMethodException | SecurityException e)
        {
            final String msg = "Failed to process key file [" + pemFile + "] - " + e.getMessage();
            throw new TransportException(msg, e);
        }

        return privateKey;
    }