277 lines
10 KiB
Java
277 lines
10 KiB
Java
/*
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* Copyright (C) 2014 Dominik Schürmann <dominik@dominikschuermann.de>
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* Copyright (C) 2014 Vincent Breitmoser <v.breitmoser@mugenguild.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.sufficientlysecure.keychain.pgp;
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import org.bouncycastle.bcpg.SignatureSubpacket;
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import org.bouncycastle.bcpg.SignatureSubpacketTags;
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import org.bouncycastle.bcpg.sig.Exportable;
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import org.bouncycastle.bcpg.sig.NotationData;
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import org.bouncycastle.bcpg.sig.Revocable;
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import org.bouncycastle.bcpg.sig.RevocationReason;
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import org.bouncycastle.openpgp.PGPException;
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import org.bouncycastle.openpgp.PGPObjectFactory;
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import org.bouncycastle.openpgp.PGPPublicKey;
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import org.bouncycastle.openpgp.PGPSignature;
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import org.bouncycastle.openpgp.PGPSignatureList;
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import org.bouncycastle.openpgp.PGPUserAttributeSubpacketVector;
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import org.bouncycastle.openpgp.operator.jcajce.JcaKeyFingerprintCalculator;
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import org.bouncycastle.openpgp.operator.jcajce.JcaPGPContentVerifierBuilderProvider;
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import org.sufficientlysecure.keychain.Constants;
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import org.sufficientlysecure.keychain.pgp.exception.PgpGeneralException;
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import org.sufficientlysecure.keychain.util.Log;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.Date;
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import java.util.HashMap;
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/** OpenKeychain wrapper around PGPSignature objects.
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*
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* This is a mostly simple wrapper around a single bouncycastle PGPSignature
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* object. It exposes high level getters for all relevant information, methods
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* for verification of various signatures (uid binding, subkey binding, generic
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* bytes), and a static method for construction from bytes.
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*
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*/
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public class WrappedSignature {
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public static final int DEFAULT_CERTIFICATION = PGPSignature.DEFAULT_CERTIFICATION;
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public static final int NO_CERTIFICATION = PGPSignature.NO_CERTIFICATION;
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public static final int CASUAL_CERTIFICATION = PGPSignature.CASUAL_CERTIFICATION;
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public static final int POSITIVE_CERTIFICATION = PGPSignature.POSITIVE_CERTIFICATION;
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public static final int CERTIFICATION_REVOCATION = PGPSignature.CERTIFICATION_REVOCATION;
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final PGPSignature mSig;
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WrappedSignature(PGPSignature sig) {
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mSig = sig;
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}
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public long getKeyId() {
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return mSig.getKeyID();
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}
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public int getSignatureType() {
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return mSig.getSignatureType();
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}
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public int getKeyAlgorithm() {
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return mSig.getKeyAlgorithm();
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}
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public Date getCreationTime() {
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return mSig.getCreationTime();
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}
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public long getKeyExpirySeconds() {
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return mSig.getHashedSubPackets().getKeyExpirationTime();
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}
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public ArrayList<WrappedSignature> getEmbeddedSignatures() {
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ArrayList<WrappedSignature> sigs = new ArrayList<>();
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if (!mSig.hasSubpackets()) {
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return sigs;
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}
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try {
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PGPSignatureList list;
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if (mSig.getHashedSubPackets() != null) {
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list = mSig.getHashedSubPackets().getEmbeddedSignatures();
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for (int i = 0; i < list.size(); i++) {
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sigs.add(new WrappedSignature(list.get(i)));
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}
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}
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if (mSig.getUnhashedSubPackets() != null) {
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list = mSig.getUnhashedSubPackets().getEmbeddedSignatures();
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for (int i = 0; i < list.size(); i++) {
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sigs.add(new WrappedSignature(list.get(i)));
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}
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}
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} catch (PGPException e) {
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// no matter
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Log.e(Constants.TAG, "exception reading embedded signatures", e);
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}
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return sigs;
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}
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public byte[] getEncoded() throws IOException {
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return mSig.getEncoded();
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}
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public boolean isRevocation() {
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return mSig.getSignatureType() == PGPSignature.CERTIFICATION_REVOCATION;
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}
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public boolean isPrimaryUserId() {
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return mSig.getHashedSubPackets().isPrimaryUserID();
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}
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public String getRevocationReason() throws PgpGeneralException {
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if(!isRevocation()) {
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throw new PgpGeneralException("Not a revocation signature.");
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}
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if (mSig.getHashedSubPackets() == null) {
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return null;
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}
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SignatureSubpacket p = mSig.getHashedSubPackets().getSubpacket(
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SignatureSubpacketTags.REVOCATION_REASON);
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// For some reason, this is missing in SignatureSubpacketInputStream:146
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if (!(p instanceof RevocationReason)) {
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p = new RevocationReason(false, false, p.getData());
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}
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return ((RevocationReason) p).getRevocationDescription();
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}
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public void init(CanonicalizedPublicKey key) throws PgpGeneralException {
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init(key.getPublicKey());
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}
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public void init(UncachedPublicKey key) throws PgpGeneralException {
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init(key.getPublicKey());
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}
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void init(PGPPublicKey key) throws PgpGeneralException {
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try {
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JcaPGPContentVerifierBuilderProvider contentVerifierBuilderProvider =
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new JcaPGPContentVerifierBuilderProvider()
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.setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME);
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mSig.init(contentVerifierBuilderProvider, key);
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} catch(PGPException e) {
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throw new PgpGeneralException(e);
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}
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}
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public void update(byte[] data, int offset, int length) {
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mSig.update(data, offset, length);
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}
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public void update(byte data) {
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mSig.update(data);
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}
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public boolean verify() throws PgpGeneralException {
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try {
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return mSig.verify();
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} catch(PGPException e) {
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throw new PgpGeneralException(e);
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}
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}
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boolean verifySignature(PGPPublicKey key) throws PgpGeneralException {
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try {
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return mSig.verifyCertification(key);
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} catch (PGPException e) {
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throw new PgpGeneralException("Error!", e);
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}
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}
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boolean verifySignature(PGPPublicKey masterKey, PGPPublicKey subKey) throws PgpGeneralException {
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try {
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return mSig.verifyCertification(masterKey, subKey);
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} catch (PGPException e) {
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throw new PgpGeneralException("Error!", e);
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}
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}
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boolean verifySignature(PGPPublicKey key, String uid) throws PgpGeneralException {
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try {
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return mSig.verifyCertification(uid, key);
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} catch (PGPException e) {
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throw new PgpGeneralException("Error!", e);
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}
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}
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boolean verifySignature(PGPPublicKey key, byte[] rawUserId) throws PgpGeneralException {
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try {
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return mSig.verifyCertification(rawUserId, key);
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} catch (PGPException e) {
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throw new PgpGeneralException("Error!", e);
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}
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}
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boolean verifySignature(PGPPublicKey key, PGPUserAttributeSubpacketVector attribute) throws PgpGeneralException {
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try {
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return mSig.verifyCertification(attribute, key);
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} catch (PGPException e) {
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throw new PgpGeneralException("Error!", e);
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}
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}
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public boolean verifySignature(UncachedPublicKey key, byte[] rawUserId) throws PgpGeneralException {
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return verifySignature(key.getPublicKey(), rawUserId);
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}
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public boolean verifySignature(CanonicalizedPublicKey key, String uid) throws PgpGeneralException {
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return verifySignature(key.getPublicKey(), uid);
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}
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public boolean verifySignature(UncachedPublicKey key, WrappedUserAttribute attribute) throws PgpGeneralException {
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return verifySignature(key.getPublicKey(), attribute.getVector());
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}
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public static WrappedSignature fromBytes(byte[] data) {
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PGPObjectFactory factory = new PGPObjectFactory(data, new JcaKeyFingerprintCalculator());
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PGPSignatureList signatures = null;
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try {
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if ((signatures = (PGPSignatureList) factory.nextObject()) == null || signatures.isEmpty()) {
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Log.e(Constants.TAG, "No signatures given!");
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return null;
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}
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} catch (IOException e) {
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Log.e(Constants.TAG, "Error while converting to PGPSignature!", e);
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return null;
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}
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return new WrappedSignature(signatures.get(0));
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}
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/** Returns true if this certificate is revocable in general. */
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public boolean isRevokable () {
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// If nothing is specified, the packet is considered revocable
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if (mSig.getHashedSubPackets() == null
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|| !mSig.getHashedSubPackets().hasSubpacket(SignatureSubpacketTags.REVOCABLE)) {
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return true;
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}
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SignatureSubpacket p = mSig.getHashedSubPackets().getSubpacket(SignatureSubpacketTags.REVOCABLE);
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return ((Revocable) p).isRevocable();
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}
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public boolean isLocal() {
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if (mSig.getHashedSubPackets() == null
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|| !mSig.getHashedSubPackets().hasSubpacket(SignatureSubpacketTags.EXPORTABLE)) {
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return false;
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}
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SignatureSubpacket p = mSig.getHashedSubPackets().getSubpacket(SignatureSubpacketTags.EXPORTABLE);
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return ! ((Exportable) p).isExportable();
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}
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public HashMap<String,String> getNotation() {
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HashMap<String,String> result = new HashMap<>();
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// If there is any notation data
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if (mSig.getHashedSubPackets() != null
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&& mSig.getHashedSubPackets().hasSubpacket(SignatureSubpacketTags.NOTATION_DATA)) {
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// Iterate over notation data
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for (NotationData data : mSig.getHashedSubPackets().getNotationDataOccurrences()) {
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result.put(data.getNotationName(), data.getNotationValue());
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}
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}
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return result;
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}
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}
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