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package org.sufficientlysecure.keychain.pgp;
import org.spongycastle.openpgp.PGPException;
import org.spongycastle.openpgp.PGPPrivateKey;
import org.spongycastle.openpgp.PGPSecretKey;
import org.spongycastle.openpgp.PGPSecretKeyRing;
import org.spongycastle.openpgp.operator.PBESecretKeyDecryptor;
import org.spongycastle.openpgp.operator.jcajce.JcaPGPDigestCalculatorProviderBuilder;
import org.spongycastle.openpgp.operator.jcajce.JcePBESecretKeyDecryptorBuilder;
import org.spongycastle.openpgp.operator.jcajce.JcePBESecretKeyEncryptorBuilder;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.pgp.exception.PgpGeneralException;
import org.sufficientlysecure.keychain.util.IterableIterator;
import java.io.IOException;
import java.security.NoSuchProviderException;
import java.util.Iterator;
public class CachedSecretKeyRing extends CachedKeyRing {
private PGPSecretKeyRing mRing;
public CachedSecretKeyRing(long masterKeyId, String userId, boolean hasAnySecret,
boolean isRevoked, boolean canCertify, long hasEncryptId, long hasSignId,
int verified, byte[] blob)
{
super(masterKeyId, userId, hasAnySecret,
isRevoked, canCertify, hasEncryptId, hasSignId,
verified);
mRing = (PGPSecretKeyRing) PgpConversionHelper.BytesToPGPKeyRing(blob);
}
PGPSecretKeyRing getRing() {
return mRing;
}
public CachedSecretKey getSubKey() {
return new CachedSecretKey(this, mRing.getSecretKey());
}
public CachedSecretKey getSubKey(long id) {
return new CachedSecretKey(this, mRing.getSecretKey(id));
}
/** Getter that returns the subkey that should be used for signing. */
CachedSecretKey getSigningSubKey() throws PgpGeneralException {
PGPSecretKey key = mRing.getSecretKey(getSignId());
if(key != null) {
CachedSecretKey cKey = new CachedSecretKey(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 UncachedSecretKeyRing changeSecretKeyPassphrase(String oldPassphrase,
String newPassphrase)
throws IOException, PGPException, NoSuchProviderException {
if (oldPassphrase == null) {
oldPassphrase = "";
}
if (newPassphrase == null) {
newPassphrase = "";
}
PGPSecretKeyRing newKeyRing = PGPSecretKeyRing.copyWithNewPassword(
mRing,
new JcePBESecretKeyDecryptorBuilder(new JcaPGPDigestCalculatorProviderBuilder()
.setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME).build()).setProvider(
Constants.BOUNCY_CASTLE_PROVIDER_NAME).build(oldPassphrase.toCharArray()),
new JcePBESecretKeyEncryptorBuilder(mRing.getSecretKey()
.getKeyEncryptionAlgorithm()).build(newPassphrase.toCharArray()));
return new UncachedSecretKeyRing(newKeyRing);
}
public IterableIterator<CachedSecretKey> iterator() {
final Iterator<PGPSecretKey> it = mRing.getSecretKeys();
return new IterableIterator<CachedSecretKey>(new Iterator<CachedSecretKey>() {
@Override
public boolean hasNext() {
return it.hasNext();
}
@Override
public CachedSecretKey next() {
return new CachedSecretKey(CachedSecretKeyRing.this, it.next());
}
@Override
public void remove() {
it.remove();
}
});
}
}
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