/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.sshd.common.util;
import java.security.KeyFactory;
import java.security.KeyPairGenerator;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.Signature;
import javax.crypto.Cipher;
import javax.crypto.KeyAgreement;
import javax.crypto.Mac;
import javax.crypto.NoSuchPaddingException;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* TODO Add javadoc
*
* @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a>
*/
public class SecurityUtils {
public static final String BOUNCY_CASTLE = "BC";
private static final Log LOG = LogFactory.getLog(SecurityUtils.class);
private static String securityProvider = null;
private static Boolean registerBouncyCastle;
private static boolean registrationDone;
public static synchronized void setSecurityProvider(String securityProvider) {
SecurityUtils.securityProvider = securityProvider;
registrationDone = false;
}
public static synchronized void setRegisterBouncyCastle(boolean registerBouncyCastle) {
SecurityUtils.registerBouncyCastle = registerBouncyCastle;
registrationDone = false;
}
public static synchronized String getSecurityProvider() {
register();
return securityProvider;
}
public static synchronized boolean isBouncyCastleRegistered() {
register();
return BOUNCY_CASTLE.equals(securityProvider);
}
private static void register() {
if (!registrationDone) {
if (securityProvider == null && (registerBouncyCastle == null || registerBouncyCastle)) {
// Use an inner class to avoid a strong dependency from SshServer on BouncyCastle
try {
new BouncyCastleRegistration().run();
} catch (Throwable t) {
if (registerBouncyCastle == null) {
LOG.info("BouncyCastle not registered, using the default JCE provider");
} else {
LOG.error("Failed to register BouncyCastle as the defaut JCE provider");
throw new RuntimeException("Failed to register BouncyCastle as the defaut JCE provider", t);
}
}
}
registrationDone = true;
}
}
private static class BouncyCastleRegistration {
public void run() throws Exception {
if (java.security.Security.getProvider(BOUNCY_CASTLE) == null) {
LOG.info("Trying to register BouncyCastle as a JCE provider");
java.security.Security.addProvider(new BouncyCastleProvider());
MessageDigest.getInstance("MD5", BOUNCY_CASTLE);
KeyAgreement.getInstance("DH", BOUNCY_CASTLE);
LOG.info("Registration succeeded");
} else {
LOG.info("BouncyCastle already registered as a JCE provider");
}
securityProvider = BOUNCY_CASTLE;
}
}
public static synchronized KeyFactory getKeyFactory(String algorithm) throws NoSuchAlgorithmException, NoSuchProviderException {
register();
if (getSecurityProvider() == null) {
return KeyFactory.getInstance(algorithm);
} else {
return KeyFactory.getInstance(algorithm, getSecurityProvider());
}
}
public static synchronized Cipher getCipher(String transformation) throws NoSuchAlgorithmException, NoSuchPaddingException, NoSuchProviderException {
register();
if (getSecurityProvider() == null) {
return Cipher.getInstance(transformation);
} else {
return Cipher.getInstance(transformation, getSecurityProvider());
}
}
public static synchronized MessageDigest getMessageDigest(String algorithm) throws NoSuchAlgorithmException, NoSuchProviderException {
register();
if (getSecurityProvider() == null) {
return MessageDigest.getInstance(algorithm);
} else {
return MessageDigest.getInstance(algorithm, getSecurityProvider());
}
}
public static synchronized KeyPairGenerator getKeyPairGenerator(String algorithm) throws NoSuchAlgorithmException, NoSuchProviderException {
register();
if (getSecurityProvider() == null) {
return KeyPairGenerator.getInstance(algorithm);
} else {
return KeyPairGenerator.getInstance(algorithm, getSecurityProvider());
}
}
public static synchronized KeyAgreement getKeyAgreement(String algorithm) throws NoSuchAlgorithmException, NoSuchProviderException {
register();
if (getSecurityProvider() == null) {
return KeyAgreement.getInstance(algorithm);
} else {
return KeyAgreement.getInstance(algorithm, getSecurityProvider());
}
}
public static synchronized Mac getMac(String algorithm) throws NoSuchAlgorithmException, NoSuchProviderException {
register();
if (getSecurityProvider() == null) {
return Mac.getInstance(algorithm);
} else {
return Mac.getInstance(algorithm, getSecurityProvider());
}
}
public static synchronized Signature getSignature(String algorithm) throws NoSuchAlgorithmException, NoSuchProviderException {
register();
if (getSecurityProvider() == null) {
return Signature.getInstance(algorithm);
} else {
return Signature.getInstance(algorithm, getSecurityProvider());
}
}
}