/**
     * Context type
     */
    public static final int NEGO_CTX_ENC_TYPE = 0x2;

    /**
     * AES 128 CCM
     */
    public static final int CIPHER_AES128_CCM = 0x1;

    /**
     * AES 128 GCM
     */
    public static final int CIPHER_AES128_GCM = 0x2;

    private int[] ciphers;


    /**
     * 
     * @param config

        byte[] keybytes = key.getEncoded();
        Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
        cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(keybytes, "AES"), new IvParameterSpec(ZERO_IV, 0, ZERO_IV.length));
        if ( constant.length != cipher.getBlockSize() ) {
            constant = expandNFold(constant, cipher.getBlockSize());

    /** The key of the configuration. e.g. 10000 */
    String search_engine_heartbeat_interval = "search_engine.heartbeat_interval";

    /** The key of the configuration. e.g. aes */
    String APP_CIPHER_ALGORISM = "app.cipher.algorism";

    /** The key of the configuration. e.g. ___change__me___ */
    String APP_CIPHER_KEY = "app.cipher.key";

    /** The key of the configuration. e.g. sha256 */

    // not customize the cipher suites list.
    List<CipherSuite> customCipherSuites = asList(
        CipherSuite.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
        CipherSuite.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
        CipherSuite.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
        CipherSuite.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384);
    final ConnectionSpec spec = new ConnectionSpec.Builder(ConnectionSpec.MODERN_TLS)

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