(Android™) RSA Sign Using Private Key from .pfx/.p12 to Base64 Signature

See more RSA Examples

Demonstrates how to RSA sign something using a private key loaded from a .pfx/.p12. The RSA signature is returned in Base64 encoded format.

Chilkat Android™ Downloads Android™ Java Libraries Android C/C++ Libraries

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

    CkRsa rsa = new CkRsa();

    // Load the .pfx/.p12
    CkPfx pfx = new CkPfx();
    boolean success = pfx.LoadPfxFile("qa_data/pfx/myKey.p12","myPassword");
    if (success != true) {
        Log.i(TAG, pfx.lastErrorText());
        return;
        }

    // Get the default private key.
    CkPrivateKey privKey = pfx.GetPrivateKey(0);
    if (pfx.get_LastMethodSuccess() != true) {
        Log.i(TAG, pfx.lastErrorText());
        return;
        }

    // Import the private key into the RSA component:
    success = rsa.ImportPrivateKeyObj(privKey);
    if (success != true) {
        Log.i(TAG, rsa.lastErrorText());

        return;
        }

    // Get the signature in base64
    rsa.put_EncodingMode("base64");

    String strData = "This is the string to be signed.";

    // Sign the string using the sha256 hash algorithm.
    // Other valid choices are "sha384", "sha512", "sha-1", "md2" and "md5".
    String base64Sig = rsa.signStringENC(strData,"sha256");

    Log.i(TAG, base64Sig);

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

  }

  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."
  }
}