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package org.sufficientlysecure.keychain.pgp;
import org.spongycastle.bcpg.sig.KeyFlags;
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.sufficientlysecure.keychain.util.IterableIterator;
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, keySize, isRevoked, canCertify, creation, expiry,
algorithm, fingerprint, userId, verified, hasSecret);
mRing = (PGPSecretKeyRing) PgpConversionHelper.BytesToPGPKeyRing(blob);
}
CachedSecretKey getSubKey(long id) {
return new CachedSecretKey(this, mRing.getSecretKey(id));
}
/** 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;
}
}
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