Read out all Security Provider

gistfile1.txt

        MessageDigest digest = null;
        try {
            digest = MessageDigest.getInstance("SHA-256");
            byte[] hash = digest.digest("hallo".getBytes(Charset.forName("UTF-8")));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }

        Provider[] providers = Security.getProviders();
        for (Provider provider : providers) {
            System.out.println("= " + provider.getName() + " =");
            System.out.println("\n\n== MESSAGE DIGEST ==");
            showHashAlgorithms(provider, MessageDigest.class);
            System.out.println("\n\n== CIPHER ==");
            showHashAlgorithms(provider, Cipher.class);
            System.out.println("\n\n== MAC ==");
            showHashAlgorithms(provider, Mac.class);
            System.out.println("\n\n== KEY AGREEMENT ==");
            showHashAlgorithms(provider, KeyAgreement.class);
            System.out.println("\n\n== SIGNATURE ==");
            showHashAlgorithms(provider, Signature.class);
            System.out.println("\n\n== SECRET KEY FACTORY ==");
            showHashAlgorithms(provider, SecretKeyFactory.class);
            System.out.println("\n\n== KEY PAIR GEN ==");
            showHashAlgorithms(provider, KeyPairGenerator.class);
        }
    }

    private static final void showHashAlgorithms(Provider prov, Class<?> typeClass) {
        String type = typeClass.getSimpleName();

        List<Provider.Service> algos = new ArrayList<>();

        Set<Provider.Service> services = prov.getServices();
        for (Provider.Service service : services) {
            if (service.getType().equalsIgnoreCase(type)) {
                algos.add(service);
            }
        }

        if (!algos.isEmpty()) {
            System.out.printf(" --- Provider %s, version %.2f --- %n", prov.getName(), prov.getVersion());
            for (Provider.Service service : algos) {
                String algo = service.getAlgorithm();
                System.out.printf("Algorithm name: \"%s\"%n", algo);


            }
        }
    }