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Kotlin conversion: CachingSecretKeyRingProtector
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2 changed files with 174 additions and 222 deletions
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// SPDX-FileCopyrightText: 2018 Paul Schaub <vanitasvitae@fsfe.org>
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//
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// SPDX-License-Identifier: Apache-2.0
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package org.pgpainless.key.protection;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.Map;
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import javax.annotation.Nonnull;
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import javax.annotation.Nullable;
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import org.bouncycastle.openpgp.PGPException;
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import org.bouncycastle.openpgp.PGPKeyRing;
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import org.bouncycastle.openpgp.PGPPublicKey;
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import org.bouncycastle.openpgp.operator.PBESecretKeyDecryptor;
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import org.bouncycastle.openpgp.operator.PBESecretKeyEncryptor;
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import org.pgpainless.key.OpenPgpFingerprint;
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import org.pgpainless.key.protection.passphrase_provider.SecretKeyPassphraseProvider;
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import org.pgpainless.util.Passphrase;
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/**
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* Implementation of the {@link SecretKeyRingProtector} which holds a map of key ids and their passwords.
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* In case the needed passphrase is not contained in the map, the {@code missingPassphraseCallback} will be consulted,
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* and the passphrase is added to the map.
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*
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* If you need to unlock multiple {@link PGPKeyRing PGPKeyRings}, it is advised to use a separate
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* {@link CachingSecretKeyRingProtector} instance for each ring.
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*/
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public class CachingSecretKeyRingProtector implements SecretKeyRingProtector, SecretKeyPassphraseProvider {
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private final Map<Long, Passphrase> cache = new HashMap<>();
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private final SecretKeyRingProtector protector;
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private final SecretKeyPassphraseProvider provider;
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public CachingSecretKeyRingProtector() {
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this(null);
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}
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public CachingSecretKeyRingProtector(@Nullable SecretKeyPassphraseProvider missingPassphraseCallback) {
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this(
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new HashMap<>(),
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KeyRingProtectionSettings.secureDefaultSettings(),
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missingPassphraseCallback
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);
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}
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public CachingSecretKeyRingProtector(@Nonnull Map<Long, Passphrase> passphrases,
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@Nonnull KeyRingProtectionSettings protectionSettings,
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@Nullable SecretKeyPassphraseProvider missingPassphraseCallback) {
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this.cache.putAll(passphrases);
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this.protector = new PasswordBasedSecretKeyRingProtector(protectionSettings, this);
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this.provider = missingPassphraseCallback;
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}
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/**
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* Add a passphrase to the cache.
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* If the cache already contains a passphrase for the given key-id, a {@link IllegalArgumentException} is thrown.
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* The reason for this is to prevent accidental override of passphrases when dealing with multiple key rings
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* containing a key with the same key-id but different passphrases.
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*
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* If you can ensure that there will be no key-id clash, and you want to replace the passphrase, you can use
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* {@link #replacePassphrase(long, Passphrase)} to replace the passphrase.
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*
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* @param keyId id of the key
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* @param passphrase passphrase
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*/
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public void addPassphrase(long keyId, @Nonnull Passphrase passphrase) {
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if (this.cache.containsKey(keyId)) {
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throw new IllegalArgumentException("The cache already holds a passphrase for ID " + Long.toHexString(keyId) + ".\n" +
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"If you want to replace the passphrase, use replacePassphrase(Long, Passphrase) instead.");
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}
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this.cache.put(keyId, passphrase);
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}
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/**
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* Replace the passphrase for the given key-id in the cache.
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*
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* @param keyId keyId
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* @param passphrase passphrase
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*/
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public void replacePassphrase(long keyId, @Nonnull Passphrase passphrase) {
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this.cache.put(keyId, passphrase);
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}
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/**
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* Remember the given passphrase for all keys in the given key ring.
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* If for the key-id of any key on the key ring the cache already contains a passphrase, a
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* {@link IllegalArgumentException} is thrown before any changes are committed to the cache.
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* This is to prevent accidental passphrase override when dealing with multiple key rings containing
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* keys with conflicting key-ids.
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*
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* If you can ensure that there will be no key-id clashes, and you want to replace the passphrases for the key ring,
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* use {@link #replacePassphrase(PGPKeyRing, Passphrase)} instead.
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*
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* If you need to unlock multiple {@link PGPKeyRing PGPKeyRings}, it is advised to use a separate
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* {@link CachingSecretKeyRingProtector} instance for each ring.
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*
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* @param keyRing key ring
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* @param passphrase passphrase
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*/
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public void addPassphrase(@Nonnull PGPKeyRing keyRing, @Nonnull Passphrase passphrase) {
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Iterator<PGPPublicKey> keys = keyRing.getPublicKeys();
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// check for existing passphrases before doing anything
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while (keys.hasNext()) {
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long keyId = keys.next().getKeyID();
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if (cache.containsKey(keyId)) {
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throw new IllegalArgumentException("The cache already holds a passphrase for ID " + Long.toHexString(keyId) + ".\n" +
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"If you want to replace the passphrase, use replacePassphrase(PGPKeyRing, Passphrase) instead.");
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}
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}
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// only then insert
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keys = keyRing.getPublicKeys();
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while (keys.hasNext()) {
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PGPPublicKey publicKey = keys.next();
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addPassphrase(publicKey, passphrase);
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}
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}
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/**
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* Replace the cached passphrases for all keys in the key ring with the provided passphrase.
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*
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* @param keyRing key ring
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* @param passphrase passphrase
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*/
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public void replacePassphrase(@Nonnull PGPKeyRing keyRing, @Nonnull Passphrase passphrase) {
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Iterator<PGPPublicKey> keys = keyRing.getPublicKeys();
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while (keys.hasNext()) {
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PGPPublicKey publicKey = keys.next();
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replacePassphrase(publicKey.getKeyID(), passphrase);
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}
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}
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/**
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* Remember the given passphrase for the given (sub-)key.
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*
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* @param key key
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* @param passphrase passphrase
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*/
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public void addPassphrase(@Nonnull PGPPublicKey key, @Nonnull Passphrase passphrase) {
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addPassphrase(key.getKeyID(), passphrase);
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}
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public void addPassphrase(@Nonnull OpenPgpFingerprint fingerprint, @Nonnull Passphrase passphrase) {
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addPassphrase(fingerprint.getKeyId(), passphrase);
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}
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/**
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* Remove a passphrase from the cache.
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* The passphrase will be cleared and then removed.
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*
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* @param keyId id of the key
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*/
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public void forgetPassphrase(long keyId) {
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Passphrase passphrase = cache.remove(keyId);
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if (passphrase != null) {
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passphrase.clear();
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}
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}
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/**
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* Forget the passphrase to all keys in the provided key ring.
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*
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* @param keyRing key ring
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*/
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public void forgetPassphrase(@Nonnull PGPKeyRing keyRing) {
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Iterator<PGPPublicKey> keys = keyRing.getPublicKeys();
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while (keys.hasNext()) {
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PGPPublicKey publicKey = keys.next();
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forgetPassphrase(publicKey);
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}
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}
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/**
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* Forget the passphrase of the given public key.
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*
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* @param key key
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*/
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public void forgetPassphrase(@Nonnull PGPPublicKey key) {
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forgetPassphrase(key.getKeyID());
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}
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@Override
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@Nullable
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public Passphrase getPassphraseFor(long keyId) {
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Passphrase passphrase = cache.get(keyId);
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if (passphrase == null || !passphrase.isValid()) {
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if (provider == null) {
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return null;
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}
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passphrase = provider.getPassphraseFor(keyId);
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if (passphrase != null) {
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cache.put(keyId, passphrase);
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}
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}
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return passphrase;
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}
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@Override
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public boolean hasPassphrase(long keyId) {
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Passphrase passphrase = cache.get(keyId);
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return passphrase != null && passphrase.isValid();
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}
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@Override
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public boolean hasPassphraseFor(long keyId) {
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return hasPassphrase(keyId);
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}
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@Override
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@Nullable
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public PBESecretKeyDecryptor getDecryptor(long keyId) throws PGPException {
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return protector.getDecryptor(keyId);
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}
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@Override
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@Nullable
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public PBESecretKeyEncryptor getEncryptor(long keyId) throws PGPException {
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return protector.getEncryptor(keyId);
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}
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}
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@ -0,0 +1,174 @@
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// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
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//
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// SPDX-License-Identifier: Apache-2.0
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package org.pgpainless.key.protection
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import org.bouncycastle.openpgp.PGPKeyRing
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import org.bouncycastle.openpgp.PGPPublicKey
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import org.pgpainless.key.OpenPgpFingerprint
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import org.pgpainless.key.protection.passphrase_provider.SecretKeyPassphraseProvider
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import org.pgpainless.key.util.KeyIdUtil
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import org.pgpainless.util.Passphrase
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/**
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* Implementation of the [SecretKeyRingProtector] which holds a map of key ids and their passwords.
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* In case the needed passphrase is not contained in the map, the `missingPassphraseCallback` will be consulted,
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* and the passphrase is added to the map.
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*
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* If you need to unlock multiple [PGPKeyRing] instances, it is advised to use a separate
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* [CachingSecretKeyRingProtector] instance for each ring.
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*/
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class CachingSecretKeyRingProtector : SecretKeyRingProtector, SecretKeyPassphraseProvider {
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private val cache: MutableMap<Long, Passphrase>
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private val protector: SecretKeyRingProtector
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private val provider: SecretKeyPassphraseProvider?
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constructor(): this(null)
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constructor(missingPassphraseCallback: SecretKeyPassphraseProvider?): this(
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mapOf<Long, Passphrase>(),
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KeyRingProtectionSettings.secureDefaultSettings(),
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missingPassphraseCallback)
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constructor(passphrases: Map<Long, Passphrase>,
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protectionSettings: KeyRingProtectionSettings,
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missingPassphraseCallback: SecretKeyPassphraseProvider?) {
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this.cache = passphrases.toMutableMap()
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this.protector = PasswordBasedSecretKeyRingProtector(protectionSettings, this)
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this.provider = missingPassphraseCallback
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}
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/**
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* Add a passphrase to the cache.
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* If the cache already contains a passphrase for the given key-id, a [IllegalArgumentException] is thrown.
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* The reason for this is to prevent accidental override of passphrases when dealing with multiple key rings
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* containing a key with the same key-id but different passphrases.
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*
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* If you can ensure that there will be no key-id clash, and you want to replace the passphrase, you can use
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* [replacePassphrase] to replace the passphrase.
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*
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* @param keyId id of the key
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* @param passphrase passphrase
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*/
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fun addPassphrase(keyId: Long, passphrase: Passphrase) = apply {
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require(!cache.containsKey(keyId)) {
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"The cache already holds a passphrase for ID ${KeyIdUtil.formatKeyId(keyId)}.\n" +
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"If you want to replace this passphrase, use replacePassphrase(Long, Passphrase) instead."
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}
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cache[keyId] = passphrase
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}
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/**
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* Replace the passphrase for the given key-id in the cache.
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*
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* @param keyId keyId
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* @param passphrase passphrase
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*/
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fun replacePassphrase(keyId: Long, passphrase: Passphrase) = apply {
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cache[keyId] = passphrase
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}
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/**
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* Remember the given passphrase for all keys in the given key ring.
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* If for the key-id of any key on the key ring the cache already contains a passphrase, a
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* [IllegalArgumentException] is thrown before any changes are committed to the cache.
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* This is to prevent accidental passphrase override when dealing with multiple key rings containing
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* keys with conflicting key-ids.
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*
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* If you can ensure that there will be no key-id clashes, and you want to replace the passphrases for the key ring,
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* use [replacePassphrase] instead.
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*
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* If you need to unlock multiple [PGPKeyRing], it is advised to use a separate [CachingSecretKeyRingProtector]
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* instance for each ring.
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*
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* @param keyRing key ring
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* @param passphrase passphrase
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*/
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fun addPassphrase(keyRing: PGPKeyRing, passphrase: Passphrase) = apply {
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// check for existing passphrases before doing anything
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keyRing.publicKeys.forEach {
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require(!cache.containsKey(it.keyID)) {
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"The cache already holds a passphrase for the key with ID ${KeyIdUtil.formatKeyId(it.keyID)}.\n" +
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"If you want to replace the passphrase, use replacePassphrase(PGPKeyRing, Passphrase) instead."
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}
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}
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// only then instert
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keyRing.publicKeys.forEach {
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cache[it.keyID] = passphrase
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}
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}
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/**
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* Replace the cached passphrases for all keys in the key ring with the provided passphrase.
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*
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* @param keyRing key ring
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* @param passphrase passphrase
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*/
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fun replacePassphrase(keyRing: PGPKeyRing, passphrase: Passphrase) = apply {
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keyRing.publicKeys.forEach { cache[it.keyID] = passphrase }
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}
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/**
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* Remember the given passphrase for the given (sub-)key.
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*
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* @param key key
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* @param passphrase passphrase
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*/
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fun addPassphrase(key: PGPPublicKey, passphrase: Passphrase) =
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addPassphrase(key.keyID, passphrase)
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/**
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* Remember the given passphrase for the key with the given fingerprint.
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*
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* @param fingerprint fingerprint
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* @param passphrase passphrase
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*/
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fun addPassphrase(fingerprint: OpenPgpFingerprint, passphrase: Passphrase) =
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addPassphrase(fingerprint.keyId, passphrase)
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/**
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* Remove a passphrase from the cache.
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* The passphrase will be cleared and then removed.
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*
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* @param keyId id of the key
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*/
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fun forgetPassphrase(keyId: Long) = apply {
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cache.remove(keyId)?.clear()
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}
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/**
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* Forget the passphrase to all keys in the provided key ring.
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*
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* @param keyRing key ring
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*/
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fun forgetPassphrase(keyRing: PGPKeyRing) = apply {
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keyRing.publicKeys.forEach { forgetPassphrase(it) }
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}
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/**
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* Forget the passphrase of the given public key.
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*
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* @param key key
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*/
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fun forgetPassphrase(key: PGPPublicKey) = apply {
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forgetPassphrase(key.keyID)
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}
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override fun getPassphraseFor(keyId: Long): Passphrase? {
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return if (hasPassphrase(keyId))
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cache[keyId]
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else
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provider?.getPassphraseFor(keyId)?.also { cache[keyId] = it }
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}
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override fun hasPassphrase(keyId: Long) = cache[keyId]?.isValid ?: false
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override fun hasPassphraseFor(keyId: Long) = hasPassphrase(keyId)
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override fun getDecryptor(keyId: Long) = protector.getDecryptor(keyId)
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override fun getEncryptor(keyId: Long) = protector.getEncryptor(keyId)
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}
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