package org.asamk.signal;

import java.io.File;
import java.io.IOException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

class Util {
    public static String getSecret(int size) {
        byte[] secret = getSecretBytes(size);
        return Base64.encodeBytes(secret);
    }

    public static byte[] getSecretBytes(int size) {
        byte[] secret = new byte[size];
        getSecureRandom().nextBytes(secret);
        return secret;
    }

    private static SecureRandom getSecureRandom() {
        try {
            return SecureRandom.getInstance("SHA1PRNG");
        } catch (NoSuchAlgorithmException e) {
            throw new AssertionError(e);
        }
    }

    public static File createTempFile() throws IOException {
        return File.createTempFile("signal_tmp_", ".tmp");
    }
}