/*
* Copyright 2016 Red Hat, Inc. and/or its affiliates
* and other contributors as indicated by the @author tags.
*
* 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 org.keycloak.saml.processing.core.util;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import java.security.GeneralSecurityException;
/**
* Utility to generate symmetric key
*
* @author Anil.Saldhana@redhat.com
* @since Feb 4, 2009
*/
public class EncryptionKeyUtil {
/**
* Generate a secret key useful for encryption/decryption
*
* @param encAlgo
* @param keySize Length of the key (if 0, defaults to 128 bits)
*
* @return
*
* @throws GeneralSecurityException
*/
public static SecretKey getSecretKey(String encAlgo, int keySize) throws GeneralSecurityException {
KeyGenerator keyGenerator = KeyGenerator.getInstance(encAlgo);
if (keySize == 0)
keySize = 128;
keyGenerator.init(keySize);
return keyGenerator.generateKey();
}
}