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The Runtime for the Flabbergast Configuration Language on the JVM.

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package flabbergast;

import java.io.ByteArrayOutputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.zip.GZIPOutputStream;

public class StaticFunctions {

    public static byte[] checksum(byte[] input, String algorithm) {
        try {
            MessageDigest complete = MessageDigest.getInstance(algorithm);
            complete.update(input);
            return complete.digest();
        } catch (NoSuchAlgorithmException e) {
            return new byte[0];
        }
    }

    public static String bytesToHex(byte[] input, String delimiter, boolean upper) {
        StringBuilder builder = new StringBuilder();
        boolean first = true;
        for (byte b : input) {
            if (first) {
                first = false;
            } else {
                builder.append(delimiter);
            }
            builder.append(String.format(upper ? "%02X" : "%02x", b));
        }
        return builder.toString();
    }

    public static byte[] compress(byte[] input) {
        try {
            ByteArrayOutputStream output =
                new ByteArrayOutputStream();
            try {
                GZIPOutputStream gzip =
                    new GZIPOutputStream(output);
                try {
                    gzip.write(input);
                } finally {
                    gzip.close();
                }

            } finally {
                output.close();
            }
            return output.toByteArray();
        } catch (Exception e) {
            return new byte[0];
        }
    }
}