Java

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. Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    // 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:

    // (image:https://example-code.com/images/gemalto_idprime_after_key_import.JPG/endImage)

    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";
    success = scmd.AcquireContext(readerName);
    if (success == false) {
        System.out.println(scmd.lastErrorText());
        return;
        }

    // If successful, the name of the currently inserted smart card is available:
    System.out.println("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) {
        System.out.println(scmd.lastErrorText());
        return;
        }

    if (pubkey_sig.get_Empty() == true) {
        System.out.println("No signature key is present.");
        }
    else {
        System.out.println("Signature key:");
        System.out.println(pubkey_sig.getPem(true));
        }

    if (pubkey_kex.get_Empty() == true) {
        System.out.println("No Key Exchange key is present.");
        }
    else {
        System.out.println("Key Exchange key:");
        System.out.println(pubkey_kex.getPem(true));
        }

    scmd.DeleteContext();

    System.out.println("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-----
  }
}