(Android™) ScMinidriver - Get Public Keys from Smart Card Key Container

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Demonstrates how to query a key container on a smart card (or USB token) to get the public part of the private keys that are present. A key container can hold two separate private keys -- one in the "signature" position, and the other in the "key exchange" position.

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// 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);

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

    // Chilkat recommends the following free tool for interactively examining the contents of your smart card
    // through the ScMinidriver interface:  MGTEK Tool for Minidriver enabled Smart Cards

    // Let's first look at our smart card..
    // Here's the view of our Gemalto (Thales) IDPrime MD T=0 smart card in the MGTEK tool:

    

    CkScMinidriver scmd = new CkScMinidriver();

    // First we need to acquire a context to the smart card in the reader where it is inserted.
    // Reader names (smart card readers or USB tokens) can be discovered
    // via List Readers or Find Smart Cards
    String readerName = "Alcor Micro USB Smart Card Reader 0";
    boolean success = scmd.AcquireContext(readerName);
    if (success == false) {
        Log.i(TAG, scmd.lastErrorText());
        return;
        }

    // If successful, the name of the currently inserted smart card is available:
    Log.i(TAG, "Card name: " + scmd.cardName());

    // We likely shouldn't need to authenticate with the smart card (use a PIN) to simply get a public key,
    // so we can skip the PIN authenticatin step..

    // Let's get the key(s) present in Container #7.
    // In our case (shown in the image above), there is a private key in the "key exchange" position, but no key in the "signature" position.
    CkPublicKey pubkey_sig = new CkPublicKey();
    CkPublicKey pubkey_kex = new CkPublicKey();

    success = scmd.GetContainerKeys(7,pubkey_sig,pubkey_kex);
    if (success == false) {
        Log.i(TAG, scmd.lastErrorText());
        return;
        }

    if (pubkey_sig.get_Empty() == true) {
        Log.i(TAG, "No signature key is present.");
        }
    else {
        Log.i(TAG, "Signature key:");
        Log.i(TAG, pubkey_sig.getPem(true));
        }

    if (pubkey_kex.get_Empty() == true) {
        Log.i(TAG, "No Key Exchange key is present.");
        }
    else {
        Log.i(TAG, "Key Exchange key:");
        Log.i(TAG, pubkey_kex.getPem(true));
        }

    scmd.DeleteContext();

    Log.i(TAG, "Success.");

    // Here's the output of the above sample code:

    // Card name: IDPrime MD T=0
    // No signature key is present.
    // Key Exchange key:
    // -----BEGIN RSA PUBLIC KEY-----
    // MIIBCgKCAQEAsXeRhM55P13FbpNcXAMR3olbw2Wa6keZIHu5YTZYUBTlYWId+pNi
    // wUz3zFIEo+0IfYR0H27ybIycQO+1IIzJofUFNMAL3tZps2OKPlsjuCPls6kXpXhv
    // /gvhux8LrCtp4PcKWqJ6QVOZKChc7WAx40qFWzHi57ueqRTv3x0kESqGg/VjsqyT
    // Evb55psJO2RsfhLT7+YVh3hImRM3RDaJdkTkPuOxeFyT6N7VXD09329sLuS3QkUb
    // E9zEKDnz9X3d8dEQdJhSI9ba5fxl8R7fu8pB67ElfzFml96X1jLFtzy1pzOT5Fc4
    // ROcaqlYckVzdBq9sxezm6MYmDBjNAcibRwIDAQAB
    // -----END RSA PUBLIC KEY-----

  }

  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."
  }
}