sigPck = sigPacket; signatureType = sigPck.getSignatureType(); trustPck = null;
this((SignaturePacket)pIn.readPacket());
    PGPSignature(        SignaturePacket    sigPacket)        throws PGPException    {        sigPck = sigPacket;        signatureType = sigPck.getSignatureType();        trustPck = null;    }