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Java library for interacting with the Digipost UserAgreements API
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/**
 * Copyright (C) Posten Norge AS
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package no.digipost.api.useragreements.client.security;

import no.digipost.api.useragreements.client.UserAgreementsApiException;
import org.bouncycastle.cms.CMSAlgorithm;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.cms.jcajce.JceCMSContentEncryptorBuilder;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.net.ssl.SSLServerSocketFactory;

import java.io.InputStream;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.Security;
import java.security.Signature;
import java.security.interfaces.RSAPrivateCrtKey;
import java.util.Arrays;
import java.util.Enumeration;

import static no.digipost.api.useragreements.client.ErrorCode.CLIENT_TECHNICAL_ERROR;

public class CryptoUtil {
	private static final Logger LOG = LoggerFactory.getLogger(CryptoUtil.class);

	public static PrivateKey loadKeyFromP12(final InputStream certificateStream, final String passord) {
		try {
			KeyStore keyStore = KeyStore.getInstance("PKCS12");
			keyStore.load(certificateStream, passord.toCharArray());
			final Enumeration aliases = keyStore.aliases();
			while (aliases.hasMoreElements()) {
				final String alias = aliases.nextElement();
				LOG.debug("Trying to get private key for alias: " + alias);
				if (keyStore.isKeyEntry(alias)) {
					RSAPrivateCrtKey key = (RSAPrivateCrtKey) keyStore.getKey(alias, passord.toCharArray());
					if (key != null) {
						LOG.debug("Found private key for alias: " + alias);
						return key;
					}
				}
			}
		} catch (Exception e) {
			throw new RuntimeException("Error loading private key: '" + e.getMessage() + "'", e);
		}
		throw new RuntimeException("No private key found in certificate file");
	}

	public static byte[] sign(final PrivateKey privateKey, final String messageToSign) {
		Signature instance;
		try {
			instance = Signature.getInstance("SHA256WithRSAEncryption");
			instance.initSign(privateKey);
			instance.update(messageToSign.getBytes());
			return instance.sign();
		} catch (Exception e) {
			throw new RuntimeException("Det skjedde en feil ved signeringen", e);
		}
	}

	public static void addBouncyCastleProviderAndVerify_AES256_CBC_Support() {
		try {
			Security.addProvider(new BouncyCastleProvider());
			LOG.debug("Registered BouncyCastleProvider");
			new JceCMSContentEncryptorBuilder(CMSAlgorithm.AES256_CBC).setProvider(BouncyCastleProvider.PROVIDER_NAME).build();
			LOG.debug("Support for AES256_CBC ok");
		} catch (CMSException e) {
			throw new RuntimeException("Feil under initialisering av algoritmer. Er Java Cryptographic Excetsions (JCE) installert?", e);
		}
	}


	public static void verifyTLSCiphersAvailable() {
		SSLServerSocketFactory ssf = (SSLServerSocketFactory) SSLServerSocketFactory.getDefault();
		String[] supportedCiphers = ssf.getSupportedCipherSuites();
		String[] requiredCiphers = {
			"TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384",
			"TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256",
			"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384",
			"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256",
			"TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384",
			"TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA",
			"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256",
			"TLS_DHE_RSA_WITH_AES_256_CBC_SHA"};

		for (String cipher : supportedCiphers) {
			for (String requiredCipher : requiredCiphers) {
				if (cipher.substring(3).compareTo(requiredCipher.substring(3)) == 0) return;
			}
		}
		throw new UserAgreementsApiException(CLIENT_TECHNICAL_ERROR, "Could not load any required TLS-ciphers. The client needs one of these ciphers to connect to the server: " + Arrays.toString(requiredCiphers) + ".\n"
				+ "Hint: is the Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy installed on the system?");
	}
}