/*
* Copyright 20013-2014 the original author or authors.
*
* 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.springframework.security.oauth2.provider.token.store;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyStore;
import java.security.PublicKey;
import java.security.interfaces.RSAPrivateCrtKey;
import java.security.spec.RSAPublicKeySpec;
import org.springframework.core.io.Resource;
/**
* Factory for RSA key pairs from a JKS keystore file. User provides a {@link Resource} location of a keystore file and
* the password to unlock it, and the factory grabs the keypairs from the store by name (and optionally password).
*
* @author Dave Syer
*
*/
public class KeyStoreKeyFactory {
private Resource resource;
private char[] password;
private KeyStore store;
private Object lock = new Object();
public KeyStoreKeyFactory(Resource resource, char[] password) {
this.resource = resource;
this.password = password;
}
public KeyPair getKeyPair(String alias) {
return getKeyPair(alias, password);
}
public KeyPair getKeyPair(String alias, char[] password) {
try {
synchronized (lock) {
if (store == null) {
synchronized (lock) {
store = KeyStore.getInstance("jks");
store.load(resource.getInputStream(), this.password);
}
}
}
RSAPrivateCrtKey key = (RSAPrivateCrtKey) store.getKey(alias, password);
RSAPublicKeySpec spec = new RSAPublicKeySpec(key.getModulus(), key.getPublicExponent());
PublicKey publicKey = KeyFactory.getInstance("RSA").generatePublic(spec);
return new KeyPair(publicKey, key);
}
catch (Exception e) {
throw new IllegalStateException("Cannot load keys from store: " + resource, e);
}
}
}