276 lines
9.3 KiB
Java
276 lines
9.3 KiB
Java
/*
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* Copyright (C) 2017 Schürmann & Breitmoser GbR
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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.asn1.ASN1ObjectIdentifier;
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import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
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import org.bouncycastle.bcpg.ECDHPublicBCPGKey;
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import org.bouncycastle.bcpg.HashAlgorithmTags;
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import org.bouncycastle.bcpg.SymmetricKeyAlgorithmTags;
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import org.bouncycastle.bcpg.sig.KeyFlags;
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import org.bouncycastle.openpgp.PGPException;
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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.operator.KeyFingerPrintCalculator;
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import org.bouncycastle.openpgp.operator.RFC6637Utils;
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import org.bouncycastle.openpgp.operator.jcajce.JcaPGPKeyConverter;
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import org.bouncycastle.openpgp.operator.jcajce.JcePublicKeyKeyEncryptionMethodGenerator;
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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.IterableIterator;
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import org.sufficientlysecure.keychain.util.Log;
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import java.io.IOException;
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import java.security.PublicKey;
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import java.security.interfaces.ECPublicKey;
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import java.util.Calendar;
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import java.util.Date;
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import java.util.GregorianCalendar;
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import java.util.Iterator;
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/** Wrapper for a PGPPublicKey.
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*
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* The methods implemented in this class are a thin layer over
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* UncachedPublicKey. The difference between the two classes is that objects of
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* this class can only be obtained from a WrappedKeyRing, and that it stores a
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* back reference to its parent as well. A method which works with
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* WrappedPublicKey is therefore guaranteed to work on a KeyRing which is
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* stored in the database.
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*
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*/
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public class CanonicalizedPublicKey extends UncachedPublicKey {
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// this is the parent key ring
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final CanonicalizedKeyRing mRing;
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CanonicalizedPublicKey(CanonicalizedKeyRing ring, PGPPublicKey key) {
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super(key);
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mRing = ring;
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}
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public CanonicalizedKeyRing getKeyRing() {
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return mRing;
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}
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public IterableIterator<String> getUserIds() {
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return new IterableIterator<String>(mPublicKey.getUserIDs());
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}
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JcePublicKeyKeyEncryptionMethodGenerator getPubKeyEncryptionGenerator(boolean hiddenRecipients) {
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return new JcePublicKeyKeyEncryptionMethodGenerator(mPublicKey, hiddenRecipients);
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}
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public boolean canSign() {
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// if key flags subpacket is available, honor it!
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if (getKeyUsage() != 0) {
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return (getKeyUsage() & KeyFlags.SIGN_DATA) != 0;
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}
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if (UncachedKeyRing.isSigningAlgo(mPublicKey.getAlgorithm())) {
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return true;
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}
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return false;
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}
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public boolean canCertify() {
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if (!isMasterKey()) {
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return false;
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}
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// if key flags subpacket is available, honor it!
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if (getKeyUsage() != 0) {
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return (getKeyUsage() & KeyFlags.CERTIFY_OTHER) != 0;
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}
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if (UncachedKeyRing.isSigningAlgo(mPublicKey.getAlgorithm())) {
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return true;
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}
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return false;
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}
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public boolean canEncrypt() {
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// if key flags subpacket is available, honor it!
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if (getKeyUsage() != 0) {
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return (getKeyUsage() & (KeyFlags.ENCRYPT_COMMS | KeyFlags.ENCRYPT_STORAGE)) != 0;
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}
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// RSA_GENERAL, RSA_ENCRYPT, ELGAMAL_ENCRYPT, ELGAMAL_GENERAL, ECDH
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if (UncachedKeyRing.isEncryptionAlgo(mPublicKey.getAlgorithm())) {
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return true;
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}
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return false;
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}
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public boolean canAuthenticate() {
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// if key flags subpacket is available, honor it!
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if (getKeyUsage() != 0) {
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return (getKeyUsage() & KeyFlags.AUTHENTICATION) != 0;
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}
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return false;
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}
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public boolean isRevoked() {
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return mPublicKey.getSignaturesOfType(isMasterKey()
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? PGPSignature.KEY_REVOCATION
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: PGPSignature.SUBKEY_REVOCATION).hasNext();
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}
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public boolean isExpired () {
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Date expiry = getExpiryTime();
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return expiry != null && expiry.before(new Date());
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}
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public boolean isSecure() {
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return PgpSecurityConstants.checkForSecurityProblems(this) == null;
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}
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public long getValidSeconds() {
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long seconds;
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// the getValidSeconds method is unreliable for master keys. we need to iterate all
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// user ids, then use the most recent certification from a non-revoked user id
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if (isMasterKey()) {
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seconds = 0;
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long masterKeyId = getKeyId();
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Date latestCreation = null;
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for (byte[] rawUserId : getUnorderedRawUserIds()) {
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Iterator<WrappedSignature> sigs = getSignaturesForRawId(rawUserId);
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while (sigs.hasNext()) {
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WrappedSignature sig = sigs.next();
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if (sig.getKeyId() != masterKeyId) {
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continue;
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}
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if (sig.isRevocation()) {
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continue;
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}
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if (latestCreation == null || latestCreation.before(sig.getCreationTime())) {
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latestCreation = sig.getCreationTime();
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seconds = sig.getKeyExpirySeconds();
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}
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}
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}
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} else {
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seconds = mPublicKey.getValidSeconds();
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}
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return seconds;
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}
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public Date getExpiryTime() {
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long seconds = getValidSeconds();
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if (seconds > Integer.MAX_VALUE) {
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Log.e(Constants.TAG, "error, expiry time too large");
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return null;
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}
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if (seconds == 0) {
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// no expiry
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return null;
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}
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Date creationDate = getCreationTime();
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Calendar calendar = GregorianCalendar.getInstance();
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calendar.setTime(creationDate);
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calendar.add(Calendar.SECOND, (int) seconds);
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return calendar.getTime();
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}
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/** Same method as superclass, but we make it public. */
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public Integer getKeyUsage() {
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return super.getKeyUsage();
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}
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/** Returns whether this key is valid, ie not expired or revoked. */
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public boolean isValid() {
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return !isRevoked() && !isExpired();
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}
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// For use in key export only; returns the public key in a JCA compatible format.
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public PublicKey getJcaPublicKey() throws PgpGeneralException {
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JcaPGPKeyConverter keyConverter = new JcaPGPKeyConverter();
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PublicKey publicKey;
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try {
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publicKey = keyConverter.getPublicKey(mPublicKey);
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} catch (PGPException e) {
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throw new PgpGeneralException("Error converting public key: "+ e.getMessage(), e);
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}
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return publicKey;
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}
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// For use in card export only; returns the public key in a JCA compatible format.
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public ECPublicKey getSecurityTokenECPublicKey()
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throws PgpGeneralException {
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return (ECPublicKey) getJcaPublicKey();
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}
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public ASN1ObjectIdentifier getSecurityTokenHashAlgorithm()
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throws PGPException {
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if (!isEC()) {
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throw new PGPException("Key encryption OID is valid only for EC key!");
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}
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final ECDHPublicBCPGKey eck = (ECDHPublicBCPGKey)mPublicKey.getPublicKeyPacket().getKey();
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switch (eck.getHashAlgorithm()) {
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case HashAlgorithmTags.SHA256:
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return NISTObjectIdentifiers.id_sha256;
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case HashAlgorithmTags.SHA384:
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return NISTObjectIdentifiers.id_sha384;
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case HashAlgorithmTags.SHA512:
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return NISTObjectIdentifiers.id_sha512;
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default:
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throw new PGPException("Invalid hash algorithm for EC key : " + eck.getHashAlgorithm());
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}
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}
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public int getSecurityTokenSymmetricKeySize()
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throws PGPException {
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if (!isEC()) {
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throw new PGPException("Key encryption OID is valid only for EC key!");
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}
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final ECDHPublicBCPGKey eck = (ECDHPublicBCPGKey)mPublicKey.getPublicKeyPacket().getKey();
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switch (eck.getSymmetricKeyAlgorithm()) {
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case SymmetricKeyAlgorithmTags.AES_128:
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return 128;
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case SymmetricKeyAlgorithmTags.AES_192:
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return 192;
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case SymmetricKeyAlgorithmTags.AES_256:
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return 256;
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default:
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throw new PGPException("Invalid symmetric encryption algorithm for EC key : " + eck.getSymmetricKeyAlgorithm());
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}
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}
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public byte[] createUserKeyingMaterial(KeyFingerPrintCalculator fingerPrintCalculator)
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throws IOException, PGPException {
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return RFC6637Utils.createUserKeyingMaterial(mPublicKey.getPublicKeyPacket(), fingerPrintCalculator);
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}
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}
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