final PGPSecretKeyRing keyRing = new PGPSecretKeyRing(keyRingFile);
keyRingFile.close();
final List<PGPSecretKey> secretKeys = Iterators.toList(keyRing.getSecretKeys());
final MasterKey masterKey = MasterKey.load(secretKeys.get(0));
this.key = SubKey.load(secretKeys.get(1), masterKey).unlock("test".toCharArray());
}