protonj2-client/src/main/java/org/apache/qpid/protonj2/client/transport/netty4/SslSupport.java [257:445]:
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        SSLEngine engine = null;

        if (allocator == null) {
            throw new IllegalArgumentException("OpenSSL engine requires a valid ByteBufAllocator to operate");
        }

        if (host == null || host.isEmpty()) {
            engine = context.newEngine(allocator);
        } else {
            engine = context.newEngine(allocator, host, port);
        }

        engine.setEnabledProtocols(buildEnabledProtocols(engine, options));
        engine.setEnabledCipherSuites(buildEnabledCipherSuites(engine, options));
        engine.setUseClientMode(true);

        if (options.verifyHost()) {
            SSLParameters sslParameters = engine.getSSLParameters();
            sslParameters.setEndpointIdentificationAlgorithm("HTTPS");
            engine.setSSLParameters(sslParameters);
        }

        return engine;
    }

    //----- Internal support methods -----------------------------------------//

    private static String[] buildEnabledProtocols(SSLEngine engine, SslOptions options) {
        List<String> enabledProtocols = new ArrayList<String>();

        if (options.enabledProtocols() != null) {
            List<String> configuredProtocols = Arrays.asList(options.enabledProtocols());
            LOG.trace("Configured protocols from transport options: {}", configuredProtocols);
            enabledProtocols.addAll(configuredProtocols);
        } else {
            List<String> engineProtocols = Arrays.asList(engine.getEnabledProtocols());
            LOG.trace("Default protocols from the SSLEngine: {}", engineProtocols);
            enabledProtocols.addAll(engineProtocols);
        }

        String[] disabledProtocols = options.disabledProtocols();
        if (disabledProtocols != null) {
            List<String> disabled = Arrays.asList(disabledProtocols);
            LOG.trace("Disabled protocols: {}", disabled);
            enabledProtocols.removeAll(disabled);
        }

        LOG.trace("Enabled protocols: {}", enabledProtocols);

        return enabledProtocols.toArray(new String[0]);
    }

    private static String[] buildEnabledCipherSuites(SSLEngine engine, SslOptions options) {
        List<String> enabledCipherSuites = new ArrayList<String>();

        if (options.enabledCipherSuites() != null) {
            List<String> configuredCipherSuites = Arrays.asList(options.enabledCipherSuites());
            LOG.trace("Configured cipher suites from transport options: {}", configuredCipherSuites);
            enabledCipherSuites.addAll(configuredCipherSuites);
        } else {
            List<String> engineCipherSuites = Arrays.asList(engine.getEnabledCipherSuites());
            LOG.trace("Default cipher suites from the SSLEngine: {}", engineCipherSuites);
            enabledCipherSuites.addAll(engineCipherSuites);
        }

        String[] disabledCipherSuites = options.disabledCipherSuites();
        if (disabledCipherSuites != null) {
            List<String> disabled = Arrays.asList(disabledCipherSuites);
            LOG.trace("Disabled cipher suites: {}", disabled);
            enabledCipherSuites.removeAll(disabled);
        }

        LOG.trace("Enabled cipher suites: {}", enabledCipherSuites);

        return enabledCipherSuites.toArray(new String[0]);
    }

    private static TrustManager[] loadTrustManagers(SslOptions options) throws Exception {
        TrustManagerFactory factory = loadTrustManagerFactory(options);
        if (factory != null) {
            return factory.getTrustManagers();
        } else {
            return null;
        }
    }

    private static TrustManagerFactory loadTrustManagerFactory(SslOptions options) throws Exception {
        if (options.trustAll()) {
            return InsecureTrustManagerFactory.INSTANCE;
        }

        if (options.trustStoreLocation() == null) {
            return null;
        }

        TrustManagerFactory fact = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());

        String storeLocation = options.trustStoreLocation();
        String storePassword = options.trustStorePassword();
        String storeType = options.trustStoreType();

        LOG.trace("Attempt to load TrustStore from location {} of type {}", storeLocation, storeType);

        KeyStore trustStore = loadStore(storeLocation, storePassword, storeType);
        fact.init(trustStore);

        return fact;
    }

    private static KeyManager[] loadKeyManagers(SslOptions options) throws Exception {
        if (options.keyStoreLocation() == null) {
            return null;
        }

        KeyManagerFactory fact = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());

        String storeLocation = options.keyStoreLocation();
        String storePassword = options.keyStorePassword();
        String storeType = options.keyStoreType();
        String alias = options.keyAlias();

        LOG.trace("Attempt to load KeyStore from location {} of type {}", storeLocation, storeType);

        KeyStore keyStore = loadStore(storeLocation, storePassword, storeType);
        fact.init(keyStore, storePassword != null ? storePassword.toCharArray() : null);

        if (alias == null) {
            return fact.getKeyManagers();
        } else {
            validateAlias(keyStore, alias);
            return wrapKeyManagers(alias, fact.getKeyManagers());
        }
    }

    private static KeyManagerFactory loadKeyManagerFactory(SslOptions options, SslProvider provider) throws Exception {
        if (options.keyStoreLocation() == null) {
            return null;
        }

        final KeyManagerFactory factory;
        if (provider.equals(SslProvider.JDK)) {
            factory = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
        } else {
            factory = new OpenSslX509KeyManagerFactory();
        }

        String storeLocation = options.keyStoreLocation();
        String storePassword = options.keyStorePassword();
        String storeType = options.keyStoreType();

        LOG.trace("Attempt to load KeyStore from location {} of type {}", storeLocation, storeType);

        KeyStore keyStore = loadStore(storeLocation, storePassword, storeType);
        factory.init(keyStore, storePassword != null ? storePassword.toCharArray() : null);

        return factory;
    }

    private static KeyManager[] wrapKeyManagers(String alias, KeyManager[] origKeyManagers) {
        KeyManager[] keyManagers = new KeyManager[origKeyManagers.length];
        for (int i = 0; i < origKeyManagers.length; i++) {
            KeyManager km = origKeyManagers[i];
            if (km instanceof X509ExtendedKeyManager) {
                km = new X509AliasKeyManager(alias, (X509ExtendedKeyManager) km);
            }

            keyManagers[i] = km;
        }

        return keyManagers;
    }

    private static void validateAlias(KeyStore store, String alias) throws IllegalArgumentException, KeyStoreException {
        if (!store.containsAlias(alias)) {
            throw new IllegalArgumentException("The alias '" + alias + "' doesn't exist in the key store");
        }

        if (!store.isKeyEntry(alias)) {
            throw new IllegalArgumentException("The alias '" + alias + "' in the keystore doesn't represent a key entry");
        }
    }

    private static KeyStore loadStore(String storePath, final String password, String storeType) throws Exception {
        KeyStore store = KeyStore.getInstance(storeType);
        try (InputStream in = new FileInputStream(new File(storePath));) {
            store.load(in, password != null ? password.toCharArray() : null);
        }

        return store;
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protonj2-client/src/main/java/org/apache/qpid/protonj2/client/transport/netty5/SslSupport.java [257:445]:
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        SSLEngine engine = null;

        if (allocator == null) {
            throw new IllegalArgumentException("OpenSSL engine requires a valid ByteBufAllocator to operate");
        }

        if (host == null || host.isEmpty()) {
            engine = context.newEngine(allocator);
        } else {
            engine = context.newEngine(allocator, host, port);
        }

        engine.setEnabledProtocols(buildEnabledProtocols(engine, options));
        engine.setEnabledCipherSuites(buildEnabledCipherSuites(engine, options));
        engine.setUseClientMode(true);

        if (options.verifyHost()) {
            SSLParameters sslParameters = engine.getSSLParameters();
            sslParameters.setEndpointIdentificationAlgorithm("HTTPS");
            engine.setSSLParameters(sslParameters);
        }

        return engine;
    }

    //----- Internal support methods -----------------------------------------//

    private static String[] buildEnabledProtocols(SSLEngine engine, SslOptions options) {
        List<String> enabledProtocols = new ArrayList<String>();

        if (options.enabledProtocols() != null) {
            List<String> configuredProtocols = Arrays.asList(options.enabledProtocols());
            LOG.trace("Configured protocols from transport options: {}", configuredProtocols);
            enabledProtocols.addAll(configuredProtocols);
        } else {
            List<String> engineProtocols = Arrays.asList(engine.getEnabledProtocols());
            LOG.trace("Default protocols from the SSLEngine: {}", engineProtocols);
            enabledProtocols.addAll(engineProtocols);
        }

        String[] disabledProtocols = options.disabledProtocols();
        if (disabledProtocols != null) {
            List<String> disabled = Arrays.asList(disabledProtocols);
            LOG.trace("Disabled protocols: {}", disabled);
            enabledProtocols.removeAll(disabled);
        }

        LOG.trace("Enabled protocols: {}", enabledProtocols);

        return enabledProtocols.toArray(new String[0]);
    }

    private static String[] buildEnabledCipherSuites(SSLEngine engine, SslOptions options) {
        List<String> enabledCipherSuites = new ArrayList<String>();

        if (options.enabledCipherSuites() != null) {
            List<String> configuredCipherSuites = Arrays.asList(options.enabledCipherSuites());
            LOG.trace("Configured cipher suites from transport options: {}", configuredCipherSuites);
            enabledCipherSuites.addAll(configuredCipherSuites);
        } else {
            List<String> engineCipherSuites = Arrays.asList(engine.getEnabledCipherSuites());
            LOG.trace("Default cipher suites from the SSLEngine: {}", engineCipherSuites);
            enabledCipherSuites.addAll(engineCipherSuites);
        }

        String[] disabledCipherSuites = options.disabledCipherSuites();
        if (disabledCipherSuites != null) {
            List<String> disabled = Arrays.asList(disabledCipherSuites);
            LOG.trace("Disabled cipher suites: {}", disabled);
            enabledCipherSuites.removeAll(disabled);
        }

        LOG.trace("Enabled cipher suites: {}", enabledCipherSuites);

        return enabledCipherSuites.toArray(new String[0]);
    }

    private static TrustManager[] loadTrustManagers(SslOptions options) throws Exception {
        TrustManagerFactory factory = loadTrustManagerFactory(options);
        if (factory != null) {
            return factory.getTrustManagers();
        } else {
            return null;
        }
    }

    private static TrustManagerFactory loadTrustManagerFactory(SslOptions options) throws Exception {
        if (options.trustAll()) {
            return InsecureTrustManagerFactory.INSTANCE;
        }

        if (options.trustStoreLocation() == null) {
            return null;
        }

        TrustManagerFactory fact = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());

        String storeLocation = options.trustStoreLocation();
        String storePassword = options.trustStorePassword();
        String storeType = options.trustStoreType();

        LOG.trace("Attempt to load TrustStore from location {} of type {}", storeLocation, storeType);

        KeyStore trustStore = loadStore(storeLocation, storePassword, storeType);
        fact.init(trustStore);

        return fact;
    }

    private static KeyManager[] loadKeyManagers(SslOptions options) throws Exception {
        if (options.keyStoreLocation() == null) {
            return null;
        }

        KeyManagerFactory fact = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());

        String storeLocation = options.keyStoreLocation();
        String storePassword = options.keyStorePassword();
        String storeType = options.keyStoreType();
        String alias = options.keyAlias();

        LOG.trace("Attempt to load KeyStore from location {} of type {}", storeLocation, storeType);

        KeyStore keyStore = loadStore(storeLocation, storePassword, storeType);
        fact.init(keyStore, storePassword != null ? storePassword.toCharArray() : null);

        if (alias == null) {
            return fact.getKeyManagers();
        } else {
            validateAlias(keyStore, alias);
            return wrapKeyManagers(alias, fact.getKeyManagers());
        }
    }

    private static KeyManagerFactory loadKeyManagerFactory(SslOptions options, SslProvider provider) throws Exception {
        if (options.keyStoreLocation() == null) {
            return null;
        }

        final KeyManagerFactory factory;
        if (provider.equals(SslProvider.JDK)) {
            factory = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
        } else {
            factory = new OpenSslX509KeyManagerFactory();
        }

        String storeLocation = options.keyStoreLocation();
        String storePassword = options.keyStorePassword();
        String storeType = options.keyStoreType();

        LOG.trace("Attempt to load KeyStore from location {} of type {}", storeLocation, storeType);

        KeyStore keyStore = loadStore(storeLocation, storePassword, storeType);
        factory.init(keyStore, storePassword != null ? storePassword.toCharArray() : null);

        return factory;
    }

    private static KeyManager[] wrapKeyManagers(String alias, KeyManager[] origKeyManagers) {
        KeyManager[] keyManagers = new KeyManager[origKeyManagers.length];
        for (int i = 0; i < origKeyManagers.length; i++) {
            KeyManager km = origKeyManagers[i];
            if (km instanceof X509ExtendedKeyManager) {
                km = new X509AliasKeyManager(alias, (X509ExtendedKeyManager) km);
            }

            keyManagers[i] = km;
        }

        return keyManagers;
    }

    private static void validateAlias(KeyStore store, String alias) throws IllegalArgumentException, KeyStoreException {
        if (!store.containsAlias(alias)) {
            throw new IllegalArgumentException("The alias '" + alias + "' doesn't exist in the key store");
        }

        if (!store.isKeyEntry(alias)) {
            throw new IllegalArgumentException("The alias '" + alias + "' in the keystore doesn't represent a key entry");
        }
    }

    private static KeyStore loadStore(String storePath, final String password, String storeType) throws Exception {
        KeyStore store = KeyStore.getInstance(storeType);
        try (InputStream in = new FileInputStream(new File(storePath));) {
            store.load(in, password != null ? password.toCharArray() : null);
        }

        return store;
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