}

    @SuppressWarnings("unchecked")
    private static PGPPublicKey stripKey(PGPPublicKey key, KeyFingerPrintCalculator fingerprintCalculator) {
        PGPPublicKey stripped;
        try {
            if (key.isMasterKey()) {
                Optional<String> id = PGPUtils.getUserIDs(key)
                    .stream()
                    .filter(KeyringStripper::looksLikeEmail)
                    .min(Comparator.comparing(String::length));

                while (pks.hasNext()) {
                    boolean hasUid = false;
                    PGPPublicKey pk = pks.next();
                    String keyType = pk.isMasterKey() ? "pub" : "sub";
                    out.write((keyType + "    " + SecuritySupport.toLongIdHexString(pk.getKeyID()).toUpperCase() + "\n").getBytes(StandardCharsets.US_ASCII));