PGPSignature sig = ((PGPSignatureList)obj).get(0);
if (sig.getVersion() > 3)
{
PGPSignatureSubpacketVector v = sig.getHashedSubPackets();
if (v.getKeyExpirationTime() != 0)
{
fail("key expiration time not zero for missing subpackets");
}
if (!sig.hasSubpackets())