def armored = new ArmoredSignatureType()
        return armored.sign(validSignatory, toSign)
    }

    static PGPSecretKey readSecretKey(File keyringsDir) {
        def keyring = new File(keyringsDir, "secring.gpg")
        PGPSecretKey secretKey = null
        keyring.withInputStream {
            new PGPSecretKeyRingCollection(it, new BcKeyFingerprintCalculator()).each {