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/*
* Copyright (C) 2014 Dominik Schürmann <dominik@dominikschuermann.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.sufficientlysecure.keychain.pgp;
import org.spongycastle.bcpg.S2K;
import org.spongycastle.openpgp.PGPException;
import org.spongycastle.openpgp.PGPKeyRing;
import org.spongycastle.openpgp.PGPObjectFactory;
import org.spongycastle.openpgp.PGPPrivateKey;
import org.spongycastle.openpgp.PGPPublicKey;
import org.spongycastle.openpgp.PGPSecretKey;
import org.spongycastle.openpgp.PGPSecretKeyRing;
import org.spongycastle.openpgp.operator.PBESecretKeyDecryptor;
import org.spongycastle.openpgp.operator.jcajce.JcePBESecretKeyDecryptorBuilder;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.pgp.exception.PgpGeneralException;
import org.sufficientlysecure.keychain.util.IterableIterator;
import org.sufficientlysecure.keychain.util.Log;
import java.io.IOException;
import java.util.HashSet;
import java.util.Iterator;
public class CanonicalizedSecretKeyRing extends CanonicalizedKeyRing {
private PGPSecretKeyRing mRing;
CanonicalizedSecretKeyRing(PGPSecretKeyRing ring, int verified) {
super(verified);
mRing = ring;
}
public CanonicalizedSecretKeyRing(byte[] blob, boolean isRevoked, int verified)
{
super(verified);
PGPObjectFactory factory = new PGPObjectFactory(blob);
PGPKeyRing keyRing = null;
try {
if ((keyRing = (PGPKeyRing) factory.nextObject()) == null) {
Log.e(Constants.TAG, "No keys given!");
}
} catch (IOException e) {
Log.e(Constants.TAG, "Error while converting to PGPKeyRing!", e);
}
mRing = (PGPSecretKeyRing) keyRing;
}
PGPSecretKeyRing getRing() {
return mRing;
}
public CanonicalizedSecretKey getSecretKey() {
return new CanonicalizedSecretKey(this, mRing.getSecretKey());
}
public CanonicalizedSecretKey getSecretKey(long id) {
return new CanonicalizedSecretKey(this, mRing.getSecretKey(id));
}
public HashSet<Long> getAvailableSubkeys() {
HashSet<Long> result = new HashSet<Long>();
// then, mark exactly the keys we have available
for (PGPSecretKey sub : new IterableIterator<PGPSecretKey>(getRing().getSecretKeys())) {
S2K s2k = sub.getS2K();
// add key, except if the private key has been stripped (GNU extension)
if(s2k == null || (s2k.getProtectionMode() != S2K.GNU_PROTECTION_MODE_NO_PRIVATE_KEY)) {
result.add(sub.getKeyID());
}
}
return result;
}
/** Getter that returns the subkey that should be used for signing. */
CanonicalizedSecretKey getSigningSubKey() throws PgpGeneralException {
PGPSecretKey key = mRing.getSecretKey(getSignId());
if(key != null) {
CanonicalizedSecretKey cKey = new CanonicalizedSecretKey(this, key);
if(!cKey.canSign()) {
throw new PgpGeneralException("key error");
}
return cKey;
}
// TODO handle with proper exception
throw new PgpGeneralException("no signing key available");
}
public boolean hasPassphrase() {
PGPSecretKey secretKey = null;
boolean foundValidKey = false;
for (Iterator keys = mRing.getSecretKeys(); keys.hasNext(); ) {
secretKey = (PGPSecretKey) keys.next();
if (!secretKey.isPrivateKeyEmpty()) {
foundValidKey = true;
break;
}
}
if(!foundValidKey) {
return false;
}
try {
PBESecretKeyDecryptor keyDecryptor = new JcePBESecretKeyDecryptorBuilder()
.setProvider("SC").build("".toCharArray());
PGPPrivateKey testKey = secretKey.extractPrivateKey(keyDecryptor);
return testKey == null;
} catch(PGPException e) {
// this means the crc check failed -> passphrase required
return true;
}
}
public IterableIterator<CanonicalizedSecretKey> secretKeyIterator() {
final Iterator<PGPSecretKey> it = mRing.getSecretKeys();
return new IterableIterator<CanonicalizedSecretKey>(new Iterator<CanonicalizedSecretKey>() {
@Override
public boolean hasNext() {
return it.hasNext();
}
@Override
public CanonicalizedSecretKey next() {
return new CanonicalizedSecretKey(CanonicalizedSecretKeyRing.this, it.next());
}
@Override
public void remove() {
it.remove();
}
});
}
public IterableIterator<CanonicalizedPublicKey> publicKeyIterator() {
final Iterator<PGPPublicKey> it = getRing().getPublicKeys();
return new IterableIterator<CanonicalizedPublicKey>(new Iterator<CanonicalizedPublicKey>() {
@Override
public boolean hasNext() {
return it.hasNext();
}
@Override
public CanonicalizedPublicKey next() {
return new CanonicalizedPublicKey(CanonicalizedSecretKeyRing.this, it.next());
}
@Override
public void remove() {
it.remove();
}
});
}
}
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