String          digestOID, AttributeTable  signedAttr, AttributeTable  unsignedAttr)
String          digestOID)
    public void addSigner(        PrivateKey      key,        X509Certificate cert,        String          digestOID,        AttributeTable  signedAttr,        AttributeTable  unsignedAttr)        throws IllegalArgumentException    {        _signers.add(new Signer(key, cert, digestOID, signedAttr, unsignedAttr));    }