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Flow 19 --- Runtime Algorithm-Discovery Smoke-Test

This scenario proves that your integration can adapt at runtime by discovering which algorithms are currently RECOMMENDED by the platform and then completing a full sign/verify and encrypt/decrypt round-trip without a single hard-coded algorithm name:

  1. Discover the live catalog with getSupportedAlgorithms().

  2. Pick the first RECOMMENDED sign/verify algorithm and the first RECOMMENDED encrypt/decrypt algorithm that meet strict PQC filters (security level & dual-standard).

  3. Generate keys for both algorithms.

  4. Compact-JWS sign → verify a sample document.

  5. Compact-JWE encrypt → decrypt the same document.

  6. Print rich server metadata for every step.

  7. Confirm that the decrypted plaintext matches the original.

Key points

  • Absolutely no brittle constants -- works even if tomorrow's recommended set changes.

  • Demonstrates getSupportedAlgorithms() plus "patch-free" key generation.

  • Covers both PQC signing (level 5) and PQC encryption (level 3).

  • Drops human-readable artefacts in temp_files/ for audits and demos.

When to use it

  • Smoke tests & CI gates -- guarantee your code survives future algorithm rotations.

  • Long-lived integrations -- auto-negotiate the most secure option instead of shipping updates.

  • Crypto posture reviews -- show auditors that you honour platform guidance in real time.

Shared helper – this code imports the utility class from
example_util.md (configuration, authentication, JSON).

Complete Java implementation

src/main/java/co/ankatech/ankasecure/sdk/examples/ExampleScenario19.java 

/* *****************************************************************************
 * FILE: ExampleScenario19.java
 * Copyright © 2025 Anka Technologies.
 * SPDX-License-Identifier: MIT
 * ---------------------------------------------------------------------------
 * Scenario 19 – Capability-Discovery Smoke-Test (Post-Quantum Focus)
 * ---------------------------------------------------------------------------
 * Demonstrates how to:
 *   * Discover platform-recommended **post-quantum** algorithms that satisfy
 *     *strict* security-level and standards criteria.
 *   * Generate keys for each discovered algorithm.
 *   * Perform non-streaming sign/verify (Compact JWS) and
 *     encrypt/decrypt (Compact JWE).
 *   * Validate round-trip integrity and inspect rich metadata.
 *
 * All transient artifacts are written under <temp_files/>.
 * ****************************************************************************/
package co.ankatech.ankasecure.sdk.examples;

import co.ankatech.ankasecure.sdk.AnkaSecureSdk;
import co.ankatech.ankasecure.sdk.exception.AnkaSecureSdkException;
import co.ankatech.ankasecure.sdk.model.*;

import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.List;
import java.util.Objects;
import java.util.Properties;
import java.util.Set;
import java.util.stream.Collectors;

import static co.ankatech.ankasecure.sdk.model.AlgorithmInfo.Category.POST_QUANTUM;
import static co.ankatech.ankasecure.sdk.model.AlgorithmInfo.Status.RECOMMENDED;

/**
 * <h2>Scenario&nbsp;19 – Runtime Discovery of PQC Algorithms</h2>
 *
 * <p>This scenario discovers two platform-recommended <em>post-quantum</em>
 * algorithms at runtime, filtered by <strong>exact</strong> security levels
 * and the dual-standards requirement <q>NIST & ENISA</q>:</p>
 * <ol>
 *   <li>Select the first PQC signing algorithm with
 *       <code>securityLevel&nbsp;5</code>.</li>
 *   <li>Select the first PQC encryption algorithm with
 *       <code>securityLevel&nbsp;3</code>.</li>
 *   <li>Generate keys and exercise Compact JWS / Compact JWE helpers.</li>
 *   <li>Validate round-trip integrity and print verbose metadata.</li>
 * </ol>
 *
 * @author ANKATech – Security Engineering
 */
public final class ExampleScenario19 {

    /** Working directory for artifacts. */
    private static final Path TEMP_DIR = Path.of("temp_files");

    /* ====================================================================== */
    /** Entry-point. */
    public static void main(final String[] args) {
        System.out.println("===== SCENARIO 19 START =====");
        System.out.println("""
                Purpose :
                  * Discover PQC signing & encryption algorithms with strict filters.
                  * Perform compact JWS sign/verify and compact JWE encrypt/decrypt.
                --------------------------------------------------------------""");

        try {
            ensureTempDir(TEMP_DIR);

            Properties props = ExampleUtil.loadProperties();
            AnkaSecureSdk sdk = ExampleUtil.authenticate(props);

            runScenario(sdk);

        } catch (Exception ex) {
            fatal("Scenario 19 failed", ex);
        }

        System.out.println("===== SCENARIO 19 END =====");
    }

    /* ====================================================================== */
    /** Executes discovery, key generation, and validation. */
    private static void runScenario(final AnkaSecureSdk sdk) throws Exception {

        /* 1 – discover algorithms -------------------------------------- */
        List<AlgorithmInfo> algorithms = sdk.getSupportedAlgorithms();

        AlgorithmInfo signAlg = algorithms.stream()
                .filter(a -> a.getStatus() == RECOMMENDED)
                .filter(a -> a.getCategory() == POST_QUANTUM)
                .filter(a -> Integer.valueOf(5).equals(a.getSecurityLevel()))
                .filter(a -> supports(a, "sign", "verify"))
                .filter(a -> a.getStandards().containsAll(Set.of("NIST", "ENISA")))
                .findFirst()
                .orElseThrow(() ->
                        new IllegalStateException("No PQC signing algorithm level 5 (NIST & ENISA) found."));

        AlgorithmInfo encAlg = algorithms.stream()
                .filter(a -> a.getStatus() == RECOMMENDED)
                .filter(a -> a.getCategory() == POST_QUANTUM)
                .filter(a -> Integer.valueOf(3).equals(a.getSecurityLevel()))
                .filter(a -> supports(a, "encrypt", "decrypt"))
                .filter(a -> a.getStandards().containsAll(Set.of("NIST", "ENISA")))
                .findFirst()
                .orElseThrow(() ->
                        new IllegalStateException("No PQC encryption algorithm level 3 (NIST & ENISA) found."));

        System.out.println("[1] PQC signing algorithm    : " + signAlg.getAlg());
        System.out.println("[2] PQC encryption algorithm : " + encAlg.getAlg());

        /* prepare sample data ------------------------------------------ */
        Path plain = TEMP_DIR.resolve("scenario19_plain.txt");
        Files.writeString(
                plain,
                "Scenario 19 – PQC discovery smoke-test.",
                StandardCharsets.UTF_8);
        System.out.println("[3] Plaintext prepared       -> " + plain.toAbsolutePath());

        /* 2 – Compact JWS sign / verify ------------------------------- */
        String signKid = "sc19_sign_" + System.currentTimeMillis();
        generateKey(sdk, signKid, signAlg);

        Path jwsFile = TEMP_DIR.resolve("scenario19.jws");
        SignResult signMeta = sdk.signFile(signKid, plain, jwsFile);
        System.out.println("[4] JWS created              -> " + jwsFile);
        printSignMeta(signMeta);

        VerifySignatureResult verifyMeta = sdk.verifySignature(jwsFile);
        System.out.println("[5] JWS valid?               -> " + verifyMeta.isValid());
        printVerifyMeta(verifyMeta);

        /* 3 – Compact JWE encrypt / decrypt --------------------------- */
        String encKid = "sc19_enc_" + System.currentTimeMillis();
        generateKey(sdk, encKid, encAlg);

        Path jweFile = TEMP_DIR.resolve("scenario19.enc");
        EncryptResult encMeta = sdk.encryptFile(encKid, plain, jweFile);
        System.out.println("[6] JWE created              -> " + jweFile);
        printEncryptMeta(encMeta);

        Path decFile = TEMP_DIR.resolve("scenario19_dec.txt");
        DecryptResultMetadata decMeta = sdk.decryptFile(jweFile, decFile);
        System.out.println("[7] Decrypted file           -> " + decFile);
        printDecryptMeta(decMeta);

        /* 4 – round-trip validation ---------------------------------- */
        boolean match = Objects.equals(
                Files.readString(plain),
                Files.readString(decFile));
        System.out.println(match
                ? "[✔] SUCCESS – round-trip data matches."
                : "[✘] FAILURE – data mismatch!");
    }

    /* ====================================================================== */
    private static boolean supports(final AlgorithmInfo alg, final String... ops) {
        Set<String> caps = alg.getKeyOps().stream()
                .map(String::toLowerCase)
                .collect(Collectors.toSet());
        return List.of(ops).stream()
                .map(String::toLowerCase)
                .allMatch(caps::contains);
    }

    private static void generateKey(final AnkaSecureSdk sdk,
                                    final String kid,
                                    final AlgorithmInfo alg) throws AnkaSecureSdkException {
        sdk.generateKey(new GenerateKeySpec()
                .setKid(kid)
                .setKty(alg.getKty())
                .setAlg(alg.getAlg())
                .setExportable(true));
        System.out.printf("    * Key generated -> kid=%s, alg=%s%n", kid, alg.getAlg());
    }

    /* ====================================================================== */
    private static void printSignMeta(final SignResult r) {
        System.out.println("----- SIGN METADATA -----");
        System.out.println("Key requested : " + ns(r.getKeyRequested()));
        System.out.println("Key used      : " + ns(r.getActualKeyUsed()));
        System.out.println("Algorithm     : " + ns(r.getAlgorithmUsed()));
        printWarnings(r.getWarnings());
    }

    private static void printVerifyMeta(final VerifySignatureResult r) {
        System.out.println("----- VERIFY METADATA -----");
        System.out.println("Valid         : " + r.isValid());
        System.out.println("Key requested : " + ns(r.getKeyRequested()));
        System.out.println("Key used      : " + ns(r.getActualKeyUsed()));
        System.out.println("Algorithm     : " + ns(r.getAlgorithmUsed()));
        printWarnings(r.getWarnings());
    }

    private static void printEncryptMeta(final EncryptResult r) {
        System.out.println("----- ENCRYPT METADATA -----");
        System.out.println("Key requested : " + ns(r.getKeyRequested()));
        System.out.println("Key used      : " + ns(r.getActualKeyUsed()));
        System.out.println("Algorithm     : " + ns(r.getAlgorithmUsed()));
        printWarnings(r.getWarnings());
    }

    private static void printDecryptMeta(final DecryptResultMetadata r) {
        System.out.println("----- DECRYPT METADATA -----");
        System.out.println("Key requested : " + ns(r.getKeyRequested()));
        System.out.println("Key used      : " + ns(r.getActualKeyUsed()));
        System.out.println("Algorithm     : " + ns(r.getAlgorithmUsed()));
        printWarnings(r.getWarnings());
    }

    private static void printWarnings(final List<String> warnings) {
        if (warnings != null && !warnings.isEmpty()) {
            System.out.println("Warnings      :");
            warnings.forEach(w -> System.out.println("  * " + w));
        }
    }

    /* ====================================================================== */
    private static String ns(final String s) {
        return (s == null || s.isBlank()) ? "(none)" : s;
    }

    private static void ensureTempDir(final Path dir) throws Exception {
        if (!Files.exists(dir)) Files.createDirectories(dir);
    }

    private static void fatal(final String msg, final Throwable t) {
        System.err.println(msg);
        if (t != null) t.printStackTrace(System.err);
        System.exit(1);
    }

    /** Utility class – no instantiation. */
    private ExampleScenario19() { /* no-instantiation */ }
}

How to run

mvn -q compile exec:java\
  -Dexec.mainClass="co.ankatech.ankasecure.sdk.examples.ExampleScenario19"

Console milestones

  • Platform-query returns live algorithm list

  • PQC signing algorithm (level 5) selected

  • PQC encryption algorithm (level 3) selected

  • Compact-JWS sign → verify succeeds

  • Compact-JWE encrypt → decrypt succeeds

  • SUCCESS -- decrypted plaintext matches original

Where next?

© 2025 Anka Technologies. All rights reserved.