Kotlin conversion: EncryptionOptions
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// SPDX-FileCopyrightText: 2021 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.encryption_signing;
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import java.util.Collections;
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import java.util.Date;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.LinkedHashSet;
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import java.util.List;
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import java.util.Map;
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import java.util.NoSuchElementException;
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import java.util.Set;
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import javax.annotation.Nonnull;
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import org.bouncycastle.openpgp.PGPPublicKey;
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import org.bouncycastle.openpgp.PGPPublicKeyRing;
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import org.bouncycastle.openpgp.PGPPublicKeyRingCollection;
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import org.bouncycastle.openpgp.operator.PBEKeyEncryptionMethodGenerator;
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import org.bouncycastle.openpgp.operator.PGPKeyEncryptionMethodGenerator;
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import org.bouncycastle.openpgp.operator.PublicKeyKeyEncryptionMethodGenerator;
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import org.pgpainless.algorithm.EncryptionPurpose;
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import org.pgpainless.algorithm.SymmetricKeyAlgorithm;
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import org.pgpainless.authentication.CertificateAuthenticity;
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import org.pgpainless.authentication.CertificateAuthority;
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import org.pgpainless.exception.KeyException;
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import org.pgpainless.implementation.ImplementationFactory;
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import org.pgpainless.key.OpenPgpFingerprint;
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import org.pgpainless.key.SubkeyIdentifier;
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import org.pgpainless.key.info.KeyAccessor;
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import org.pgpainless.key.info.KeyRingInfo;
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import org.pgpainless.util.Passphrase;
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/**
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* Options for the encryption process.
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* This class can be used to set encryption parameters, like encryption keys and passphrases, algorithms etc.
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* <p>
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* A typical use might look like follows:
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* <pre>
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* {@code
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* EncryptionOptions opt = new EncryptionOptions();
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* opt.addRecipient(aliceKey, "Alice <alice@wonderland.lit>");
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* opt.addPassphrase(Passphrase.fromPassword("AdditionalDecryptionPassphrase123"));
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* }
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* </pre>
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*<p>
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* To use a custom symmetric encryption algorithm, use {@link #overrideEncryptionAlgorithm(SymmetricKeyAlgorithm)}.
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* This will cause PGPainless to use the provided algorithm for message encryption, instead of negotiating an algorithm
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* by inspecting the provided recipient keys.
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* <p>
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* By default, PGPainless will encrypt to all suitable, encryption capable subkeys on each recipient's certificate.
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* This behavior can be changed per recipient, e.g. by calling
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* <pre>
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* {@code
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* opt.addRecipient(aliceKey, EncryptionOptions.encryptToFirstSubkey());
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* }
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* </pre>
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* when adding the recipient key.
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*/
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public class EncryptionOptions {
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private final EncryptionPurpose purpose;
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private final Set<PGPKeyEncryptionMethodGenerator> encryptionMethods = new LinkedHashSet<>();
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private final Set<SubkeyIdentifier> encryptionKeys = new LinkedHashSet<>();
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private final Map<SubkeyIdentifier, KeyRingInfo> keyRingInfo = new HashMap<>();
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private final Map<SubkeyIdentifier, KeyAccessor> keyViews = new HashMap<>();
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private final EncryptionKeySelector encryptionKeySelector = encryptToAllCapableSubkeys();
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private boolean allowEncryptionWithMissingKeyFlags = false;
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private Date evaluationDate = new Date();
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private SymmetricKeyAlgorithm encryptionAlgorithmOverride = null;
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/**
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* Encrypt to keys both carrying the key flag {@link org.pgpainless.algorithm.KeyFlag#ENCRYPT_COMMS}
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* or {@link org.pgpainless.algorithm.KeyFlag#ENCRYPT_STORAGE}.
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*/
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public EncryptionOptions() {
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this(EncryptionPurpose.ANY);
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}
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public EncryptionOptions(@Nonnull EncryptionPurpose purpose) {
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this.purpose = purpose;
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}
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/**
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* Factory method to create an {@link EncryptionOptions} object which will encrypt for keys
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* which carry either the {@link org.pgpainless.algorithm.KeyFlag#ENCRYPT_COMMS} or
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* {@link org.pgpainless.algorithm.KeyFlag#ENCRYPT_STORAGE} flag.
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* <p>
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* Use this if you are not sure.
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*
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* @return encryption options
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*/
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public static EncryptionOptions get() {
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return new EncryptionOptions();
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}
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/**
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* Override the evaluation date for recipient keys with the given date.
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*
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* @param evaluationDate new evaluation date
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* @return this
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*/
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public EncryptionOptions setEvaluationDate(@Nonnull Date evaluationDate) {
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this.evaluationDate = evaluationDate;
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return this;
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}
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/**
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* Factory method to create an {@link EncryptionOptions} object which will encrypt for keys
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* which carry the flag {@link org.pgpainless.algorithm.KeyFlag#ENCRYPT_COMMS}.
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*
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* @return encryption options
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*/
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public static EncryptionOptions encryptCommunications() {
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return new EncryptionOptions(EncryptionPurpose.COMMUNICATIONS);
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}
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/**
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* Factory method to create an {@link EncryptionOptions} object which will encrypt for keys
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* which carry the flag {@link org.pgpainless.algorithm.KeyFlag#ENCRYPT_STORAGE}.
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*
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* @return encryption options
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*/
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public static EncryptionOptions encryptDataAtRest() {
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return new EncryptionOptions(EncryptionPurpose.STORAGE);
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}
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/**
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* Identify authenticatable certificates for the given user-ID by querying the {@link CertificateAuthority} for
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* identifiable bindings.
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* Add all acceptable bindings, whose trust amount is larger or equal to the target amount to the list of recipients.
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* @param userId userId
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* @param email if true, treat the user-ID as an email address and match all user-IDs containing the mail address
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* @param authority certificate authority
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* @return encryption options
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*/
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public EncryptionOptions addAuthenticatableRecipients(String userId, boolean email, CertificateAuthority authority) {
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return addAuthenticatableRecipients(userId, email, authority, 120);
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}
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/**
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* Identify authenticatable certificates for the given user-ID by querying the {@link CertificateAuthority} for
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* identifiable bindings.
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* Add all acceptable bindings, whose trust amount is larger or equal to the target amount to the list of recipients.
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* @param userId userId
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* @param email if true, treat the user-ID as an email address and match all user-IDs containing the mail address
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* @param authority certificate authority
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* @param targetAmount target amount (120 = fully authenticated, 240 = doubly authenticated,
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* 60 = partially authenticated...)
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* @return encryption options
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*/
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public EncryptionOptions addAuthenticatableRecipients(String userId, boolean email, CertificateAuthority authority, int targetAmount) {
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List<CertificateAuthenticity> identifiedCertificates = authority.lookupByUserId(userId, email, evaluationDate, targetAmount);
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boolean foundAcceptable = false;
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for (CertificateAuthenticity candidate : identifiedCertificates) {
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if (candidate.isAuthenticated()) {
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addRecipient(candidate.getCertificate());
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foundAcceptable = true;
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}
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}
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if (!foundAcceptable) {
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throw new IllegalArgumentException("Could not identify any trust-worthy certificates for '" + userId + "' and target trust amount " + targetAmount);
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}
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return this;
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}
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/**
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* Add all key rings in the provided {@link Iterable} (e.g. {@link PGPPublicKeyRingCollection}) as recipients.
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*
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* @param keys keys
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* @return this
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*/
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public EncryptionOptions addRecipients(@Nonnull Iterable<PGPPublicKeyRing> keys) {
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if (!keys.iterator().hasNext()) {
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throw new IllegalArgumentException("Set of recipient keys cannot be empty.");
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}
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for (PGPPublicKeyRing key : keys) {
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addRecipient(key);
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}
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return this;
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}
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/**
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* Add all key rings in the provided {@link Iterable} (e.g. {@link PGPPublicKeyRingCollection}) as recipients.
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* Per key ring, the selector is applied to select one or more encryption subkeys.
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*
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* @param keys keys
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* @param selector encryption key selector
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* @return this
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*/
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public EncryptionOptions addRecipients(@Nonnull Iterable<PGPPublicKeyRing> keys, @Nonnull EncryptionKeySelector selector) {
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if (!keys.iterator().hasNext()) {
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throw new IllegalArgumentException("Set of recipient keys cannot be empty.");
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}
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for (PGPPublicKeyRing key : keys) {
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addRecipient(key, selector);
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}
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return this;
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}
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/**
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* Add a recipient by providing a key and recipient user-id.
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* The user-id is used to determine the recipients preferences (algorithms etc.).
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*
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* @param key key ring
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* @param userId user id
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* @return this
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*/
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public EncryptionOptions addRecipient(@Nonnull PGPPublicKeyRing key, @Nonnull CharSequence userId) {
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return addRecipient(key, userId, encryptionKeySelector);
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}
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/**
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* Add a recipient by providing a key and recipient user-id, as well as a strategy for selecting one or multiple
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* encryption capable subkeys from the key.
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*
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* @param key key
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* @param userId user-id
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* @param encryptionKeySelectionStrategy strategy to select one or more encryption subkeys to encrypt to
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* @return this
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*/
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public EncryptionOptions addRecipient(@Nonnull PGPPublicKeyRing key,
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@Nonnull CharSequence userId,
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@Nonnull EncryptionKeySelector encryptionKeySelectionStrategy) {
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KeyRingInfo info = new KeyRingInfo(key, evaluationDate);
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List<PGPPublicKey> encryptionSubkeys = encryptionKeySelectionStrategy
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.selectEncryptionSubkeys(info.getEncryptionSubkeys(userId.toString(), purpose));
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if (encryptionSubkeys.isEmpty()) {
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throw new KeyException.UnacceptableEncryptionKeyException(OpenPgpFingerprint.of(key));
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}
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for (PGPPublicKey encryptionSubkey : encryptionSubkeys) {
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SubkeyIdentifier keyId = new SubkeyIdentifier(key, encryptionSubkey.getKeyID());
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keyRingInfo.put(keyId, info);
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keyViews.put(keyId, new KeyAccessor.ViaUserId(info, keyId, userId.toString()));
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addRecipientKey(key, encryptionSubkey, false);
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}
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return this;
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}
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/**
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* Add a recipient by providing a key.
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*
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* @param key key ring
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* @return this
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*/
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public EncryptionOptions addRecipient(@Nonnull PGPPublicKeyRing key) {
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return addRecipient(key, encryptionKeySelector);
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}
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/**
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* Add a recipient by providing a key and an encryption key selection strategy.
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*
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* @param key key ring
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* @param encryptionKeySelectionStrategy strategy used to select one or multiple encryption subkeys.
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* @return this
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*/
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public EncryptionOptions addRecipient(@Nonnull PGPPublicKeyRing key,
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@Nonnull EncryptionKeySelector encryptionKeySelectionStrategy) {
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return addAsRecipient(key, encryptionKeySelectionStrategy, false);
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}
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/**
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* Add a certificate as hidden recipient.
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* The recipients key-id will be obfuscated by setting a wildcard key ID.
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*
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* @param key recipient key
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* @return this
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*/
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public EncryptionOptions addHiddenRecipient(@Nonnull PGPPublicKeyRing key) {
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return addHiddenRecipient(key, encryptionKeySelector);
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}
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/**
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* Add a certificate as hidden recipient, using the provided {@link EncryptionKeySelector} to select recipient subkeys.
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* The recipients key-ids will be obfuscated by setting a wildcard key ID instead.
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*
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* @param key recipient key
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* @param encryptionKeySelectionStrategy strategy to select recipient (sub) keys.
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* @return this
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*/
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public EncryptionOptions addHiddenRecipient(PGPPublicKeyRing key, EncryptionKeySelector encryptionKeySelectionStrategy) {
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return addAsRecipient(key, encryptionKeySelectionStrategy, true);
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}
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private EncryptionOptions addAsRecipient(PGPPublicKeyRing key, EncryptionKeySelector encryptionKeySelectionStrategy, boolean wildcardKeyId) {
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KeyRingInfo info = new KeyRingInfo(key, evaluationDate);
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Date primaryKeyExpiration;
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try {
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primaryKeyExpiration = info.getPrimaryKeyExpirationDate();
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} catch (NoSuchElementException e) {
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throw new KeyException.UnacceptableSelfSignatureException(OpenPgpFingerprint.of(key));
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}
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if (primaryKeyExpiration != null && primaryKeyExpiration.before(evaluationDate)) {
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throw new KeyException.ExpiredKeyException(OpenPgpFingerprint.of(key), primaryKeyExpiration);
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}
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List<PGPPublicKey> encryptionSubkeys = encryptionKeySelectionStrategy
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.selectEncryptionSubkeys(info.getEncryptionSubkeys(purpose));
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// There are some legacy keys around without key flags.
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// If we allow encryption for those keys, we add valid keys without any key flags, if they are
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// capable of encryption by means of their algorithm
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if (encryptionSubkeys.isEmpty() && allowEncryptionWithMissingKeyFlags) {
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List<PGPPublicKey> validSubkeys = info.getValidSubkeys();
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for (PGPPublicKey validSubkey : validSubkeys) {
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if (!validSubkey.isEncryptionKey()) {
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continue;
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}
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// only add encryption keys with no key flags.
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if (info.getKeyFlagsOf(validSubkey.getKeyID()).isEmpty()) {
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encryptionSubkeys.add(validSubkey);
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}
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}
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}
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if (encryptionSubkeys.isEmpty()) {
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throw new KeyException.UnacceptableEncryptionKeyException(OpenPgpFingerprint.of(key));
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}
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for (PGPPublicKey encryptionSubkey : encryptionSubkeys) {
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SubkeyIdentifier keyId = new SubkeyIdentifier(key, encryptionSubkey.getKeyID());
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keyRingInfo.put(keyId, info);
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keyViews.put(keyId, new KeyAccessor.ViaKeyId(info, keyId));
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addRecipientKey(key, encryptionSubkey, wildcardKeyId);
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}
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return this;
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}
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private void addRecipientKey(@Nonnull PGPPublicKeyRing keyRing,
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@Nonnull PGPPublicKey key,
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boolean wildcardKeyId) {
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encryptionKeys.add(new SubkeyIdentifier(keyRing, key.getKeyID()));
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PublicKeyKeyEncryptionMethodGenerator encryptionMethod = ImplementationFactory
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.getInstance().getPublicKeyKeyEncryptionMethodGenerator(key);
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encryptionMethod.setUseWildcardKeyID(wildcardKeyId);
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addEncryptionMethod(encryptionMethod);
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}
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/**
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* Add a symmetric passphrase which the message will be encrypted to.
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*
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* @param passphrase passphrase
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* @return this
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*/
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public EncryptionOptions addPassphrase(@Nonnull Passphrase passphrase) {
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if (passphrase.isEmpty()) {
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throw new IllegalArgumentException("Passphrase must not be empty.");
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}
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PBEKeyEncryptionMethodGenerator encryptionMethod = ImplementationFactory
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.getInstance().getPBEKeyEncryptionMethodGenerator(passphrase);
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return addEncryptionMethod(encryptionMethod);
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}
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/**
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* Add an {@link PGPKeyEncryptionMethodGenerator} which will be used to encrypt the message.
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* Method generators are either {@link PBEKeyEncryptionMethodGenerator} (passphrase)
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* or {@link PGPKeyEncryptionMethodGenerator} (public key).
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*
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* This method is intended for advanced users to allow encryption for specific subkeys.
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* This can come in handy for example if data needs to be encrypted to a subkey that's ignored by PGPainless.
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*
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* @param encryptionMethod encryption method
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* @return this
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*/
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public EncryptionOptions addEncryptionMethod(@Nonnull PGPKeyEncryptionMethodGenerator encryptionMethod) {
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encryptionMethods.add(encryptionMethod);
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return this;
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}
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Set<PGPKeyEncryptionMethodGenerator> getEncryptionMethods() {
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return new HashSet<>(encryptionMethods);
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}
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Map<SubkeyIdentifier, KeyRingInfo> getKeyRingInfo() {
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return new HashMap<>(keyRingInfo);
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}
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Set<SubkeyIdentifier> getEncryptionKeyIdentifiers() {
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return new HashSet<>(encryptionKeys);
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}
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Map<SubkeyIdentifier, KeyAccessor> getKeyViews() {
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return new HashMap<>(keyViews);
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}
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SymmetricKeyAlgorithm getEncryptionAlgorithmOverride() {
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return encryptionAlgorithmOverride;
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}
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/**
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* Override the used symmetric encryption algorithm.
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* The symmetric encryption algorithm is used to encrypt the message itself,
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* while the used symmetric key will be encrypted to all recipients using public key
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* cryptography.
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*
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* If the algorithm is not overridden, a suitable algorithm will be negotiated.
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*
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* @param encryptionAlgorithm encryption algorithm override
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* @return this
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*/
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public EncryptionOptions overrideEncryptionAlgorithm(@Nonnull SymmetricKeyAlgorithm encryptionAlgorithm) {
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if (encryptionAlgorithm == SymmetricKeyAlgorithm.NULL) {
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throw new IllegalArgumentException("Plaintext encryption can only be used to denote unencrypted secret keys.");
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}
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this.encryptionAlgorithmOverride = encryptionAlgorithm;
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return this;
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}
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/**
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* If this method is called, subsequent calls to {@link #addRecipient(PGPPublicKeyRing)} will allow encryption
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* for subkeys that do not carry any {@link org.pgpainless.algorithm.KeyFlag} subpacket.
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* This is a workaround for dealing with legacy keys that have no key flags subpacket but rely on the key algorithm
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* type to convey the subkeys use.
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*
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* @return this
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*/
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public EncryptionOptions setAllowEncryptionWithMissingKeyFlags() {
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this.allowEncryptionWithMissingKeyFlags = true;
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return this;
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}
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/**
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* Return <pre>true</pre> iff the user specified at least one encryption method,
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* <pre>false</pre> otherwise.
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*
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* @return encryption methods is not empty
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*/
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public boolean hasEncryptionMethod() {
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return !encryptionMethods.isEmpty();
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}
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public interface EncryptionKeySelector {
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List<PGPPublicKey> selectEncryptionSubkeys(@Nonnull List<PGPPublicKey> encryptionCapableKeys);
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}
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/**
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* Only encrypt to the first valid encryption capable subkey we stumble upon.
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*
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* @return encryption key selector
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*/
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public static EncryptionKeySelector encryptToFirstSubkey() {
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return new EncryptionKeySelector() {
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@Override
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public List<PGPPublicKey> selectEncryptionSubkeys(@Nonnull List<PGPPublicKey> encryptionCapableKeys) {
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return encryptionCapableKeys.isEmpty() ? Collections.emptyList() : Collections.singletonList(encryptionCapableKeys.get(0));
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}
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};
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}
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/**
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* Encrypt to any valid, encryption capable subkey on the key ring.
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*
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* @return encryption key selector
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*/
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public static EncryptionKeySelector encryptToAllCapableSubkeys() {
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return new EncryptionKeySelector() {
|
||||
@Override
|
||||
public List<PGPPublicKey> selectEncryptionSubkeys(@Nonnull List<PGPPublicKey> encryptionCapableKeys) {
|
||||
return encryptionCapableKeys;
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
// TODO: Create encryptToBestSubkey() method
|
||||
}
|
||||
|
|
@ -0,0 +1,294 @@
|
|||
package org.pgpainless.encryption_signing
|
||||
|
||||
import org.bouncycastle.openpgp.PGPPublicKey
|
||||
import org.bouncycastle.openpgp.PGPPublicKeyRing
|
||||
import org.bouncycastle.openpgp.operator.PGPKeyEncryptionMethodGenerator
|
||||
import org.pgpainless.algorithm.EncryptionPurpose
|
||||
import org.pgpainless.algorithm.SymmetricKeyAlgorithm
|
||||
import org.pgpainless.authentication.CertificateAuthority
|
||||
import org.pgpainless.exception.KeyException
|
||||
import org.pgpainless.exception.KeyException.*
|
||||
import org.pgpainless.implementation.ImplementationFactory
|
||||
import org.pgpainless.key.OpenPgpFingerprint
|
||||
import org.pgpainless.key.SubkeyIdentifier
|
||||
import org.pgpainless.key.info.KeyAccessor
|
||||
import org.pgpainless.key.info.KeyRingInfo
|
||||
import org.pgpainless.util.Passphrase
|
||||
import java.util.*
|
||||
import javax.annotation.Nonnull
|
||||
|
||||
|
||||
class EncryptionOptions(
|
||||
private val purpose: EncryptionPurpose
|
||||
) {
|
||||
private val _encryptionMethods: MutableSet<PGPKeyEncryptionMethodGenerator> = mutableSetOf()
|
||||
private val _encryptionKeyIdentifiers: MutableSet<SubkeyIdentifier> = mutableSetOf()
|
||||
private val _keyRingInfo: MutableMap<SubkeyIdentifier, KeyRingInfo> = mutableMapOf()
|
||||
private val _keyViews: MutableMap<SubkeyIdentifier, KeyAccessor> = mutableMapOf()
|
||||
private val encryptionKeySelector: EncryptionKeySelector = encryptToAllCapableSubkeys()
|
||||
|
||||
private var allowEncryptionWithMissingKeyFlags = false
|
||||
private var evaluationDate = Date()
|
||||
private var _encryptionAlgorithmOverride: SymmetricKeyAlgorithm? = null
|
||||
|
||||
val encryptionMethods
|
||||
get() = _encryptionMethods.toSet()
|
||||
val encryptionKeyIdentifiers
|
||||
get() = _encryptionKeyIdentifiers.toSet()
|
||||
val keyRingInfo
|
||||
get() = _keyRingInfo.toMap()
|
||||
val keyViews
|
||||
get() = _keyViews.toMap()
|
||||
val encryptionAlgorithmOverride
|
||||
get() = _encryptionAlgorithmOverride
|
||||
|
||||
constructor(): this(EncryptionPurpose.ANY)
|
||||
|
||||
/**
|
||||
* Factory method to create an {@link EncryptionOptions} object which will encrypt for keys
|
||||
* which carry the flag {@link org.pgpainless.algorithm.KeyFlag#ENCRYPT_COMMS}.
|
||||
*
|
||||
* @return encryption options
|
||||
*/
|
||||
fun setEvaluationDate(evaluationDate: Date) = apply {
|
||||
this.evaluationDate = evaluationDate
|
||||
}
|
||||
|
||||
/**
|
||||
* Identify authenticatable certificates for the given user-ID by querying the {@link CertificateAuthority} for
|
||||
* identifiable bindings.
|
||||
* Add all acceptable bindings, whose trust amount is larger or equal to the target amount to the list of recipients.
|
||||
* @param userId userId
|
||||
* @param email if true, treat the user-ID as an email address and match all user-IDs containing the mail address
|
||||
* @param authority certificate authority
|
||||
* @param targetAmount target amount (120 = fully authenticated, 240 = doubly authenticated,
|
||||
* 60 = partially authenticated...)
|
||||
* @return encryption options
|
||||
*/
|
||||
@JvmOverloads
|
||||
fun addAuthenticatableRecipients(userId: String, email: Boolean, authority: CertificateAuthority, targetAmount: Int = 120) = apply {
|
||||
var foundAcceptable = false
|
||||
authority.lookupByUserId(userId, email, evaluationDate, targetAmount)
|
||||
.filter { it.isAuthenticated() }
|
||||
.forEach { addRecipient(it.certificate)
|
||||
.also {
|
||||
foundAcceptable = true
|
||||
}
|
||||
}
|
||||
require(foundAcceptable) {
|
||||
"Could not identify any trust-worthy certificates for '$userId' and target trust amount $targetAmount."
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Add all key rings in the provided {@link Iterable} (e.g. {@link PGPPublicKeyRingCollection}) as recipients.
|
||||
*
|
||||
* @param keys keys
|
||||
* @return this
|
||||
*/
|
||||
fun addRecipients(keys: Iterable<PGPPublicKeyRing>) = apply {
|
||||
keys.toList().let {
|
||||
require(it.isNotEmpty()) {
|
||||
"Set of recipient keys cannot be empty."
|
||||
}
|
||||
it.forEach { key -> addRecipient(key) }
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Add all key rings in the provided {@link Iterable} (e.g. {@link PGPPublicKeyRingCollection}) as recipients.
|
||||
* Per key ring, the selector is applied to select one or more encryption subkeys.
|
||||
*
|
||||
* @param keys keys
|
||||
* @param selector encryption key selector
|
||||
* @return this
|
||||
*/
|
||||
fun addRecipients(keys: Iterable<PGPPublicKeyRing>, selector: EncryptionKeySelector) = apply {
|
||||
keys.toList().let {
|
||||
require(it.isNotEmpty()) {
|
||||
"Set of recipient keys cannot be empty."
|
||||
}
|
||||
it.forEach { key -> addRecipient(key, selector) }
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Add a recipient by providing a key.
|
||||
*
|
||||
* @param key key ring
|
||||
* @return this
|
||||
*/
|
||||
fun addRecipient(key: PGPPublicKeyRing) = addRecipient(key, encryptionKeySelector)
|
||||
|
||||
/**
|
||||
* Add a recipient by providing a key and recipient user-id.
|
||||
* The user-id is used to determine the recipients preferences (algorithms etc.).
|
||||
*
|
||||
* @param key key ring
|
||||
* @param userId user id
|
||||
* @return this
|
||||
*/
|
||||
fun addRecipient(key: PGPPublicKeyRing, userId: CharSequence) =
|
||||
addRecipient(key, userId, encryptionKeySelector)
|
||||
|
||||
fun addRecipient(key: PGPPublicKeyRing, userId: CharSequence, encryptionKeySelector: EncryptionKeySelector) = apply {
|
||||
val info = KeyRingInfo(key, evaluationDate)
|
||||
val subkeys = encryptionKeySelector.selectEncryptionSubkeys(info.getEncryptionSubkeys(userId, purpose))
|
||||
if (subkeys.isEmpty()) {
|
||||
throw KeyException.UnacceptableEncryptionKeyException(OpenPgpFingerprint.of(key))
|
||||
}
|
||||
|
||||
for (subkey in subkeys) {
|
||||
val keyId = SubkeyIdentifier(key, subkey.keyID)
|
||||
(_keyRingInfo as MutableMap)[keyId] = info
|
||||
(_keyViews as MutableMap)[keyId] = KeyAccessor.ViaUserId(info, keyId, userId.toString())
|
||||
addRecipientKey(key, subkey, false)
|
||||
}
|
||||
}
|
||||
|
||||
fun addRecipient(key: PGPPublicKeyRing, encryptionKeySelector: EncryptionKeySelector) = apply {
|
||||
addAsRecipient(key, encryptionKeySelector, false)
|
||||
}
|
||||
|
||||
@JvmOverloads
|
||||
fun addHiddenRecipient(key: PGPPublicKeyRing, selector: EncryptionKeySelector = encryptionKeySelector) = apply {
|
||||
addAsRecipient(key, selector, true)
|
||||
}
|
||||
|
||||
private fun addAsRecipient(key: PGPPublicKeyRing, selector: EncryptionKeySelector, wildcardKeyId: Boolean) = apply {
|
||||
val info = KeyRingInfo(key, evaluationDate)
|
||||
val primaryKeyExpiration = try {
|
||||
info.primaryKeyExpirationDate
|
||||
} catch (e: NoSuchElementException) {
|
||||
throw UnacceptableSelfSignatureException(OpenPgpFingerprint.of(key))
|
||||
}
|
||||
|
||||
if (primaryKeyExpiration != null && primaryKeyExpiration < evaluationDate) {
|
||||
throw ExpiredKeyException(OpenPgpFingerprint.of(key), primaryKeyExpiration)
|
||||
}
|
||||
|
||||
var encryptionSubkeys = selector.selectEncryptionSubkeys(info.getEncryptionSubkeys(purpose))
|
||||
|
||||
// There are some legacy keys around without key flags.
|
||||
// If we allow encryption for those keys, we add valid keys without any key flags, if they are
|
||||
// capable of encryption by means of their algorithm
|
||||
if (encryptionSubkeys.isEmpty() && allowEncryptionWithMissingKeyFlags) {
|
||||
encryptionSubkeys = info.validSubkeys
|
||||
.filter { it.isEncryptionKey }
|
||||
.filter { info.getKeyFlagsOf(it.keyID).isEmpty() }
|
||||
}
|
||||
|
||||
if (encryptionSubkeys.isEmpty()) {
|
||||
throw UnacceptableEncryptionKeyException(OpenPgpFingerprint.of(key))
|
||||
}
|
||||
|
||||
for (subkey in encryptionSubkeys) {
|
||||
val keyId = SubkeyIdentifier(key, subkey.keyID)
|
||||
(_keyRingInfo as MutableMap)[keyId] = info
|
||||
(_keyViews as MutableMap)[keyId] = KeyAccessor.ViaKeyId(info, keyId)
|
||||
addRecipientKey(key, subkey, wildcardKeyId)
|
||||
}
|
||||
}
|
||||
|
||||
private fun addRecipientKey(certificate: PGPPublicKeyRing,
|
||||
key: PGPPublicKey,
|
||||
wildcardKeyId: Boolean) {
|
||||
(_encryptionKeyIdentifiers as MutableSet).add(SubkeyIdentifier(certificate, key.keyID))
|
||||
addEncryptionMethod(ImplementationFactory.getInstance()
|
||||
.getPublicKeyKeyEncryptionMethodGenerator(key)
|
||||
.also { it.setUseWildcardKeyID(wildcardKeyId) })
|
||||
}
|
||||
|
||||
/**
|
||||
* Add a symmetric passphrase which the message will be encrypted to.
|
||||
*
|
||||
* @param passphrase passphrase
|
||||
* @return this
|
||||
*/
|
||||
fun addPassphrase(passphrase: Passphrase) = apply {
|
||||
require(!passphrase.isEmpty) {
|
||||
"Passphrase MUST NOT be empty."
|
||||
}
|
||||
addEncryptionMethod(ImplementationFactory.getInstance().getPBEKeyEncryptionMethodGenerator(passphrase))
|
||||
}
|
||||
|
||||
/**
|
||||
* Add an {@link PGPKeyEncryptionMethodGenerator} which will be used to encrypt the message.
|
||||
* Method generators are either {@link PBEKeyEncryptionMethodGenerator} (passphrase)
|
||||
* or {@link PGPKeyEncryptionMethodGenerator} (public key).
|
||||
*
|
||||
* This method is intended for advanced users to allow encryption for specific subkeys.
|
||||
* This can come in handy for example if data needs to be encrypted to a subkey that's ignored by PGPainless.
|
||||
*
|
||||
* @param encryptionMethod encryption method
|
||||
* @return this
|
||||
*/
|
||||
fun addEncryptionMethod(encryptionMethod: PGPKeyEncryptionMethodGenerator) = apply {
|
||||
(_encryptionMethods as MutableSet).add(encryptionMethod)
|
||||
}
|
||||
|
||||
/**
|
||||
* Override the used symmetric encryption algorithm.
|
||||
* The symmetric encryption algorithm is used to encrypt the message itself,
|
||||
* while the used symmetric key will be encrypted to all recipients using public key
|
||||
* cryptography.
|
||||
*
|
||||
* If the algorithm is not overridden, a suitable algorithm will be negotiated.
|
||||
*
|
||||
* @param encryptionAlgorithm encryption algorithm override
|
||||
* @return this
|
||||
*/
|
||||
fun overrideEncryptionAlgorithm(encryptionAlgorithm: SymmetricKeyAlgorithm) = apply {
|
||||
require(encryptionAlgorithm != SymmetricKeyAlgorithm.NULL) {
|
||||
"Encryption algorithm override cannot be NULL."
|
||||
}
|
||||
_encryptionAlgorithmOverride = encryptionAlgorithm
|
||||
}
|
||||
|
||||
/**
|
||||
* If this method is called, subsequent calls to {@link #addRecipient(PGPPublicKeyRing)} will allow encryption
|
||||
* for subkeys that do not carry any {@link org.pgpainless.algorithm.KeyFlag} subpacket.
|
||||
* This is a workaround for dealing with legacy keys that have no key flags subpacket but rely on the key algorithm
|
||||
* type to convey the subkeys use.
|
||||
*
|
||||
* @return this
|
||||
*/
|
||||
fun setAllowEncryptionWithMissingKeyFlags() = apply {
|
||||
this.allowEncryptionWithMissingKeyFlags = true
|
||||
}
|
||||
|
||||
fun hasEncryptionMethod() = _encryptionMethods.isNotEmpty()
|
||||
|
||||
|
||||
fun interface EncryptionKeySelector {
|
||||
fun selectEncryptionSubkeys(encryptionCapableKeys: List<PGPPublicKey>): List<PGPPublicKey>
|
||||
}
|
||||
|
||||
companion object {
|
||||
@JvmStatic
|
||||
fun get() = EncryptionOptions()
|
||||
|
||||
@JvmStatic
|
||||
fun encryptCommunications() = EncryptionOptions(EncryptionPurpose.COMMUNICATIONS)
|
||||
|
||||
@JvmStatic
|
||||
fun encryptDataAtRest() = EncryptionOptions(EncryptionPurpose.STORAGE)
|
||||
|
||||
/**
|
||||
* Only encrypt to the first valid encryption capable subkey we stumble upon.
|
||||
*
|
||||
* @return encryption key selector
|
||||
*/
|
||||
@JvmStatic
|
||||
fun encryptToFirstSubkey() = EncryptionKeySelector { encryptionCapableKeys ->
|
||||
encryptionCapableKeys.firstOrNull()?.let { listOf(it) } ?: listOf() }
|
||||
|
||||
/**
|
||||
* Encrypt to any valid, encryption capable subkey on the key ring.
|
||||
*
|
||||
* @return encryption key selector
|
||||
*/
|
||||
@JvmStatic
|
||||
fun encryptToAllCapableSubkeys() = EncryptionKeySelector { encryptionCapableKeys -> encryptionCapableKeys }
|
||||
}
|
||||
}
|
||||
|
|
@ -11,6 +11,7 @@ import static org.junit.jupiter.api.Assertions.assertTrue;
|
|||
|
||||
import java.security.InvalidAlgorithmParameterException;
|
||||
import java.security.NoSuchAlgorithmException;
|
||||
import java.util.ArrayList;
|
||||
import java.util.Arrays;
|
||||
import java.util.Collections;
|
||||
import java.util.Iterator;
|
||||
|
|
@ -22,6 +23,7 @@ import org.bouncycastle.openpgp.PGPPublicKey;
|
|||
import org.bouncycastle.openpgp.PGPPublicKeyRing;
|
||||
import org.bouncycastle.openpgp.PGPPublicKeyRingCollection;
|
||||
import org.bouncycastle.openpgp.PGPSecretKeyRing;
|
||||
import org.jetbrains.annotations.NotNull;
|
||||
import org.junit.jupiter.api.BeforeAll;
|
||||
import org.junit.jupiter.api.Test;
|
||||
import org.pgpainless.PGPainless;
|
||||
|
|
@ -122,7 +124,7 @@ public class EncryptionOptionsTest {
|
|||
EncryptionOptions options = new EncryptionOptions();
|
||||
assertThrows(IllegalArgumentException.class, () -> options.addRecipients(Collections.emptyList()));
|
||||
assertThrows(IllegalArgumentException.class, () -> options.addRecipients(Collections.emptyList(),
|
||||
encryptionCapableKeys -> encryptionCapableKeys));
|
||||
ArrayList::new));
|
||||
}
|
||||
|
||||
@Test
|
||||
|
|
@ -150,8 +152,9 @@ public class EncryptionOptionsTest {
|
|||
|
||||
assertThrows(KeyException.UnacceptableEncryptionKeyException.class,
|
||||
() -> options.addRecipient(publicKeys, new EncryptionOptions.EncryptionKeySelector() {
|
||||
@NotNull
|
||||
@Override
|
||||
public List<PGPPublicKey> selectEncryptionSubkeys(@Nonnull List<PGPPublicKey> encryptionCapableKeys) {
|
||||
public List<PGPPublicKey> selectEncryptionSubkeys(@NotNull List<? extends PGPPublicKey> encryptionCapableKeys) {
|
||||
return Collections.emptyList();
|
||||
}
|
||||
}));
|
||||
|
|
@ -159,7 +162,7 @@ public class EncryptionOptionsTest {
|
|||
assertThrows(KeyException.UnacceptableEncryptionKeyException.class,
|
||||
() -> options.addRecipient(publicKeys, "test@pgpainless.org", new EncryptionOptions.EncryptionKeySelector() {
|
||||
@Override
|
||||
public List<PGPPublicKey> selectEncryptionSubkeys(@Nonnull List<PGPPublicKey> encryptionCapableKeys) {
|
||||
public List<PGPPublicKey> selectEncryptionSubkeys(@Nonnull List<? extends PGPPublicKey> encryptionCapableKeys) {
|
||||
return Collections.emptyList();
|
||||
}
|
||||
}));
|
||||
|
|
|
|||
Loading…
Reference in New Issue