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package org.sufficientlysecure.keychain.pgp;
import org.spongycastle.bcpg.sig.KeyFlags;
import org.spongycastle.openpgp.PGPException;
import org.spongycastle.openpgp.PGPPrivateKey;
import org.spongycastle.openpgp.PGPPublicKey;
import org.spongycastle.openpgp.PGPSecretKey;
import org.spongycastle.openpgp.PGPSecretKeyRing;
import org.spongycastle.openpgp.PGPSignature;
import org.spongycastle.openpgp.PGPSignatureSubpacketVector;
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.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, int keySize, boolean isRevoked,
boolean canCertify, long creation, long expiry, int algorithm,
byte[] fingerprint, String userId, int verified, boolean hasSecret,
byte[] blob)
{
super(masterKeyId, canCertify, fingerprint, userId, verified, hasSecret);
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));
}
public IterableIterator<CachedSecretKey> iterator() {
return new IterableIterator<CachedSecretKey>(mRing.getSecretKeys());
}
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;
}
}
/** This returns the subkey that should be used for signing.
* At this point, this is simply the first suitable subkey.
*/
CachedSecretKey getSigningSubKey() {
for (PGPSecretKey key : new IterableIterator<PGPSecretKey>(mRing.getSecretKeys())) {
if (isSigningKey(key.getPublicKey())) {
return new CachedSecretKey(this, key);
}
}
// TODO exception
return null;
}
@SuppressWarnings("unchecked")
public static boolean isSigningKey(PGPPublicKey key) {
if (key.getVersion() <= 3) {
return true;
}
// special case
if (key.getAlgorithm() == PGPPublicKey.RSA_SIGN) {
return true;
}
for (PGPSignature sig : new IterableIterator<PGPSignature>(key.getSignatures())) {
if (key.isMasterKey() && sig.getKeyID() != key.getKeyID()) {
continue;
}
PGPSignatureSubpacketVector hashed = sig.getHashedSubPackets();
if (hashed != null && (hashed.getKeyFlags() & KeyFlags.SIGN_DATA) != 0) {
return true;
}
PGPSignatureSubpacketVector unhashed = sig.getUnhashedSubPackets();
if (unhashed != null && (unhashed.getKeyFlags() & KeyFlags.SIGN_DATA) != 0) {
return true;
}
}
return false;
}
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);
}
}
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