Android™

Examine SSL/TLS Server Certificate

See more Socket/SSL/TLS Examples

Demonstrates how an application can examine and check a server's SSL/TLS certificate. Android™

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    boolean success = false;

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkSocket socket = new CkSocket();

    // Connect to a server.
    boolean useTls = true;
    int maxWaitMs = 2000;
    success = socket.Connect("www.intel.com",443,useTls,maxWaitMs);
    if (success == false) {
        Log.i(TAG, socket.lastErrorText());
        return;
        }

    // If we get here, the TLS connection ws made..
    // In any SSL/TLS handshake, the server sends its certificate in a TLS handshake message.
    // Chilkat will keep it cached within the object that made the connection.
    // Get the server's cert and examine a few things.
    CkCert cert = new CkCert();
    socket.GetServerCert(cert);

    Log.i(TAG, "Distinguished Name: " + cert.subjectDN());
    Log.i(TAG, "Common Name: " + cert.subjectCN());
    Log.i(TAG, "Issuer Distinguished Name: " + cert.issuerDN());
    Log.i(TAG, "Issuer Common Name: " + cert.issuerCN());

    Log.i(TAG, "Expired: " + String.valueOf(cert.get_Expired()));
    Log.i(TAG, "Revoked: " + String.valueOf(cert.get_Revoked()));
    Log.i(TAG, "Signature Verified: " + String.valueOf(cert.get_SignatureVerified()));
    Log.i(TAG, "Trusted Root: " + String.valueOf(cert.get_TrustedRoot()));

    // Sample output:

    // Distinguished Name: C=US, ST=California, O=Intel Corporation, CN=*.intel.com
    // Common Name: *.intel.com
    // Issuer Distinguished Name: C=GB, ST=Greater Manchester, L=Salford, O=Sectigo Limited, CN=Sectigo RSA Organization Validation Secure Server CA
    // Issuer Common Name: Sectigo RSA Organization Validation Secure Server CA
    // Expired: False
    // Revoked: False
    // Signature Verified: True
    // Trusted Root: True

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}