基于Java实现的国密TLCP套件（GB/T 38636-2020）适用于各个版本安卓，简单修改后也可以用于其他JAVA应用
目前只实现了TLCP_ECC_SM4_CBC_SM3、TLCP_ECC_SM4_GCM_SM3、TLCP_ECDHE_SM4_CBC_SM3和TLCP_ECDHE_SM4_GCM_SM3。

基于国密TLCP套件进行了适配，官方原版为：3.12.14并将工程修改为gradle(6.9.2)。
仅仅修改了3个类：TlsVersion，CipherSuite和ConnectionSpec。
编译环境：windows11 + JDK 8

直接使用编译的aar

提取aar中的jar

目前缺省日志是System.out输出，如需根据情况修改，实现接口Logger.ILogWriter，并调用
Logger.initialize(ILogWriter logWriter)进行设置。

private static final String[] TEST_HOST_URL = new String[]{
        "https://demo.gmssl.cn:1443",
        "https://demo.gmssl.cn:2443",	// ECDHE不支持了！
        "https://demo.gmssl.cn:3443",
};

private static final GMProvider gmProvider = new GMProvider();
private static final BouncyCastleProvider bcProvider = new BouncyCastleProvider();

private SSLSocketFactory initTestGMSSL() {
    try {
	    Logger.initialize(new Logger.ILogWriter() {	// 可选
            @Override
            public int println(int priority, String tag, String msg) {
                if (priority >= Logger.DEBUG) {
                    System.out.println(tag + msg);
                }
                return 0;
            }
        });
        GMProvider.setEnableLog(false);
        GMProvider.setCipherSuites(new GMCipherSuite[]{GMCipherSuite.TLCP_ECDHE_SM4_CBC_SM3, GMCipherSuite.TLCP_ECC_SM4_CBC_SM3});

        KeyStore keyStore = KeyStore.getInstance("PKCS12", bcProvider);
        keyStore.load(new FileInputStream(getFilesDir() + "/sm2.GMSSLClient.both.pfx"), "12345678".toCharArray()); // 提前push文件到files或者从assets提取
        KeyManagerFactory kmf = KeyManagerFactory.getInstance("PKIX", gmProvider);
        kmf.init(keyStore, "12345678".toCharArray());
        TrustManagerFactory tmf = TrustManagerFactory.getInstance("X509", gmProvider);
        tmf.init(keyStore);

        SSLContext sc = SSLContext.getInstance("TLS", gmProvider);//TLS/TLCP etc.
        sc.init(kmf.getKeyManagers(), null, null); // tmf.getTrustManagers()
        return sc.getSocketFactory();
    } catch (Exception e) {
        e.printStackTrace();
    }

    return null;
}

@SuppressLint("BadHostnameVerifier")
private boolean testHttpsUrlConnection(String hostUrl) {
    try {
        long p0 = System.currentTimeMillis();
        HttpsURLConnection conn = (HttpsURLConnection) (new URL(hostUrl)).openConnection();
        conn.setRequestMethod("GET");
        conn.addRequestProperty("Connection", "close");
        conn.setSSLSocketFactory(ssf);
        conn.setHostnameVerifier(new HostnameVerifier() {
            @Override
            public boolean verify(String hostname, SSLSession session) {
                return true;
            }
        });
        long p1 = System.currentTimeMillis();
        conn.connect();
        long p2 = System.currentTimeMillis();
        byte[] bytes = getBytesFromStream(conn.getInputStream());
        conn.disconnect();
        long p3 = System.currentTimeMillis();
        showMessage(MSG_NORMAL, "Read:" + bytes.length + ", Time(ms): "
                + (p1 - p0) + "+"
                + (p2 - p1) + "+"
                + (p3 - p2) + "="
                + (p3 - p0));

        return true;
    } catch (Exception e) {
        e.printStackTrace();
        showMessage(MSG_NORMAL, e.getMessage());
    }

    return false;
}

private boolean testGMOkHttp(String hostUrl) {
    try {
        long p0 = System.currentTimeMillis();
        OkHttpClient okHttpClient = new OkHttpClient.Builder()
                .sslSocketFactory(ssf, new TrustAll())
                .connectionSpecs(Arrays.asList(ConnectionSpec.TLCP_TLS))
                .build();
        Request request = new Request.Builder().url(hostUrl).get().build();
        long p1 = System.currentTimeMillis();
        Call call = okHttpClient.newCall(request);
        long p2 = System.currentTimeMillis();

        Response response = call.execute();
        long p3 = System.currentTimeMillis();
        showMessage(MSG_NORMAL, "Read:" + response.body().bytes().length + ", Time(ms): "
                + (p1 - p0) + "+"
                + (p2 - p1) + "+"
                + (p3 - p2) + "="
                + (p3 - p0));
        return true;
    } catch (IOException e) {
        e.printStackTrace();
        showMessage(MSG_NORMAL, e.getMessage());
    }

    return false;
}