PGPSignatureGenerator generator = createSignatureGenerator();
        try {
            feedGeneratorWith(toSign, generator);

            PGPSignature signature = generator.generate();
            writeSignatureTo(signatureDestination, signature);
        } catch (IOException e) {
            throw new UncheckedIOException(e);
        } catch (PGPException e) {
            throw UncheckedException.throwAsUncheckedException(e);