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Code Issues Releases Wiki Activity

Add SecretKeyPassphraseProvider and default implementations

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This commit is contained in:
Paul Schaub 2018-07-23 14:27:43 +02:00
parent c1e217f7b7
commit 8537f9a165
Signed by: vanitasvitae
GPG key ID: 62BEE9264BF17311
3 changed files with 140 additions and 24 deletions
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65
pgpainless-core/src/main/java/org/pgpainless/key/protection/PassphraseMapKeyRingProtector.java
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@ -21,51 +21,68 @@ import java.util.Map;
import org.bouncycastle.openpgp.PGPException;
import org.bouncycastle.openpgp.operator.PBESecretKeyDecryptor;
import org.bouncycastle.openpgp.operator.PBESecretKeyEncryptor;
import org.bouncycastle.openpgp.operator.PGPDigestCalculatorProvider;
import org.bouncycastle.openpgp.operator.bc.BcPBESecretKeyDecryptorBuilder;
import org.bouncycastle.openpgp.operator.bc.BcPBESecretKeyEncryptorBuilder;
import org.bouncycastle.openpgp.operator.bc.BcPGPDigestCalculatorProvider;
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 {
public class PassphraseMapKeyRingProtector implements SecretKeyRingProtector, SecretKeyPassphraseProvider {
private static final PGPDigestCalculatorProvider calculatorProvider = new BcPGPDigestCalculatorProvider();
private final Map<Long, Passphrase> cache = new HashMap<>();
private final SecretKeyRingProtector protector;
private final SecretKeyPassphraseProvider provider;
private final Map<Long, Passphrase> passphrases = new HashMap<>();
private final KeyRingProtectionSettings protectionSettings;
public PassphraseMapKeyRingProtector(Map<Long, Passphrase> passphrases, KeyRingProtectionSettings protectionSettings) {
this.passphrases.putAll(passphrases);
this.protectionSettings = protectionSettings;
public PassphraseMapKeyRingProtector(Map<Long, Passphrase> passphrases,
KeyRingProtectionSettings protectionSettings,
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(Long keyId, Passphrase passphrase) {
this.passphrases.put(keyId, 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(Long keyId) {
Passphrase passphrase = passphrases.get(keyId);
Passphrase passphrase = cache.get(keyId);
passphrase.clear();
passphrases.remove(keyId);
cache.remove(keyId);
}
@Override
public Passphrase getPassphraseFor(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
public PBESecretKeyDecryptor getDecryptor(Long keyId) {
Passphrase passphrase = passphrases.get(keyId);
return new BcPBESecretKeyDecryptorBuilder(calculatorProvider)
.build(passphrase != null ? passphrase.getChars() : null);
return protector.getDecryptor(keyId);
}
@Override
public PBESecretKeyEncryptor getEncryptor(Long keyId) throws PGPException {
Passphrase passphrase = passphrases.get(keyId);
return new BcPBESecretKeyEncryptorBuilder(
protectionSettings.getEncryptionAlgorithm().getAlgorithmId(),
calculatorProvider.get(protectionSettings.getHashAlgorithm().getAlgorithmId()),
protectionSettings.getS2kCount())
.build(passphrase != null ? passphrase.getChars() : null);
return protector.getEncryptor(keyId);
}
}

67
pgpainless-core/src/main/java/org/pgpainless/key/protection/PasswordBasedSecretKeyRingProtector.java Normal file
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@ -0,0 +1,67 @@
/*
* 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 org.bouncycastle.openpgp.PGPException;
import org.bouncycastle.openpgp.operator.PBESecretKeyDecryptor;
import org.bouncycastle.openpgp.operator.PBESecretKeyEncryptor;
import org.bouncycastle.openpgp.operator.PGPDigestCalculatorProvider;
import org.bouncycastle.openpgp.operator.bc.BcPBESecretKeyDecryptorBuilder;
import org.bouncycastle.openpgp.operator.bc.BcPBESecretKeyEncryptorBuilder;
import org.bouncycastle.openpgp.operator.bc.BcPGPDigestCalculatorProvider;
import org.pgpainless.util.Passphrase;
/**
* Provides {@link PBESecretKeyDecryptor} and {@link PBESecretKeyEncryptor} objects while getting the passphrases
* from a {@link SecretKeyPassphraseProvider} and using settings from an {@link KeyRingProtectionSettings}.
*/
public class PasswordBasedSecretKeyRingProtector implements SecretKeyRingProtector {
private static final PGPDigestCalculatorProvider calculatorProvider = new BcPGPDigestCalculatorProvider();
protected final KeyRingProtectionSettings protectionSettings;
protected final SecretKeyPassphraseProvider passphraseProvider;
/**
* Constructor.
* Passphrases for keys are sourced from the {@code passphraseProvider} and decryptors/encryptors are constructed
* following the settings given in {@code settings}.
*
* @param settings S2K settings etc.
* @param passphraseProvider provider which provides passphrases.
*/
public PasswordBasedSecretKeyRingProtector(KeyRingProtectionSettings settings, SecretKeyPassphraseProvider passphraseProvider) {
this.protectionSettings = settings;
this.passphraseProvider = passphraseProvider;
}
@Override
public PBESecretKeyDecryptor getDecryptor(Long keyId) {
Passphrase passphrase = passphraseProvider.getPassphraseFor(keyId);
return new BcPBESecretKeyDecryptorBuilder(calculatorProvider)
.build(passphrase != null ? passphrase.getChars() : null);
}
@Override
public PBESecretKeyEncryptor getEncryptor(Long keyId) throws PGPException {
Passphrase passphrase = passphraseProvider.getPassphraseFor(keyId);
return new BcPBESecretKeyEncryptorBuilder(
protectionSettings.getEncryptionAlgorithm().getAlgorithmId(),
calculatorProvider.get(protectionSettings.getHashAlgorithm().getAlgorithmId()),
protectionSettings.getS2kCount())
.build(passphrase != null ? passphrase.getChars() : null);
}
}

32
pgpainless-core/src/main/java/org/pgpainless/key/protection/SecretKeyPassphraseProvider.java Normal file
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@ -0,0 +1,32 @@
/*
* 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 org.pgpainless.util.Passphrase;
/**
* Interface to allow the user to provide a passphrase for an encrypted OpenPGP secret key.
*/
public interface SecretKeyPassphraseProvider {
/**
* Return a passphrase for the given key.
*
* @param keyId id of the key
* @return passphrase
*/
Passphrase getPassphraseFor(Long keyId);
}