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RotateSecretHMAC.java
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package act.crypto;
/*-
* #%L
* ACT Framework
* %%
* Copyright (C) 2014 - 2018 ActFramework
* %%
* 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.
* #L%
*/
import act.session.RotationSecretProvider;
import org.osgl.$;
import javax.crypto.Mac;
public class RotateSecretHMAC extends HMAC {
private RotationSecretProvider secretProvider;
private boolean rotateEnabled;
public RotateSecretHMAC(String algoKey, RotationSecretProvider secretProvider) {
super(secretProvider.rawSecret(), algoKey);
this.secretProvider = $.requireNotNull(secretProvider);
this.rotateEnabled = secretProvider.isRotateEnabled();
}
public RotateSecretHMAC(Algorithm algo, RotationSecretProvider secretProvider) {
super(secretProvider.rawSecret(), algo);
this.secretProvider = secretProvider;
}
@Override
protected boolean verifyHash(byte[] payload, byte[] hash) {
if (!rotateEnabled) {
return super.verifyHash(payload, hash);
}
return verifyHash(payload, hash, curMac())
|| verifyHash(payload, hash, prevMac())
|| verifyHash(payload, hash, nextMac());
}
@Override
protected byte[] doHash(byte[] bytes) {
return rotateEnabled ? doHash(bytes, curMac()) : super.doHash(bytes);
}
private Mac curMac() {
return algo.macOf(secretProvider.curSecret());
}
private Mac prevMac() {
return algo.macOf(secretProvider.lastSecret());
}
private Mac nextMac() {
return algo.macOf(secretProvider.nextSecret());
}
}