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pgpainless/pgpainless-core/src/main/java/org/pgpainless/key/protection/PassphraseMapKeyRingProtector.java

94 lines
3.2 KiB
Java

/*
* Copyright 2018 Paul Schaub.
*
* 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.pgpainless.key.protection;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.util.HashMap;
import java.util.Map;
import org.bouncycastle.openpgp.PGPException;
import org.bouncycastle.openpgp.operator.PBESecretKeyDecryptor;
import org.bouncycastle.openpgp.operator.PBESecretKeyEncryptor;
import org.pgpainless.util.Passphrase;
/**
* Implementation of the {@link SecretKeyRingProtector} which holds a map of key ids and their passwords.
* In case the needed passphrase is not contained in the map, the {@code missingPassphraseCallback} will be consulted,
* and the passphrase is added to the map.
*/
public class PassphraseMapKeyRingProtector implements SecretKeyRingProtector, SecretKeyPassphraseProvider {
private final Map<Long, Passphrase> cache = new HashMap<>();
private final SecretKeyRingProtector protector;
private final SecretKeyPassphraseProvider provider;
public PassphraseMapKeyRingProtector(@Nonnull Map<Long, Passphrase> passphrases,
@Nonnull KeyRingProtectionSettings protectionSettings,
@Nullable SecretKeyPassphraseProvider missingPassphraseCallback) {
this.cache.putAll(passphrases);
this.protector = new PasswordBasedSecretKeyRingProtector(protectionSettings, this);
this.provider = missingPassphraseCallback;
}
/**
* Add a passphrase to the cache.
*
* @param keyId id of the key
* @param passphrase passphrase
*/
public void addPassphrase(@Nonnull Long keyId, @Nullable Passphrase passphrase) {
this.cache.put(keyId, passphrase);
}
/**
* Remove a passphrase from the cache.
* The passphrase will be cleared and then removed.
*
* @param keyId id of the key
*/
public void forgetPassphrase(@Nonnull Long keyId) {
Passphrase passphrase = cache.get(keyId);
passphrase.clear();
cache.remove(keyId);
}
@Override
@Nullable
public Passphrase getPassphraseFor(@Nonnull Long keyId) {
Passphrase passphrase = cache.get(keyId);
if (passphrase == null || !passphrase.isValid()) {
passphrase = provider.getPassphraseFor(keyId);
if (passphrase != null) {
cache.put(keyId, passphrase);
}
}
return passphrase;
}
@Override
@Nullable
public PBESecretKeyDecryptor getDecryptor(@Nonnull Long keyId) {
return protector.getDecryptor(keyId);
}
@Override
@Nullable
public PBESecretKeyEncryptor getEncryptor(@Nonnull Long keyId) throws PGPException {
return protector.getEncryptor(keyId);
}
}