(Android™) Base64url Encoding

Base64url encoding is identical to base64 encoding except it uses non-reserved URL characters (e.g. '–' is used instead of '+', and '_' is used instead of '/') and it omits the padding characters. Chilkat adds support for "base64url" in version 9.5.0.56. (To be released Q1 2016.) The list of binary encodings supported by Chilkat are documented at Chilkat Binary Encodings For any supported encoding, such as base64, hex, url, quoted-printable, modbase64, base64url, etc., the encoding name may be used in any "EncodingMode" property or in any method argument that specifies a binary encoding. (Please note that a "binary encoding" is different than a "character encoding". Character encodings supported by Chilkat are listed at Chilkat Character Encodings.) This example demonstrates using base64url encoding by setting the RSA object's EncodingMode property equal to "base64url".

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

    // Create an instance of a certificate store object, load a PFX file,
    // locate the certificate we need, and use it for signing.
    // (a PFX file may contain more than one certificate.)
    CkCertStore certStore = new CkCertStore();

    // The 1st argument is the filename, the 2nd arg is the 
    // PFX file's password:
    boolean success = certStore.LoadPfxFile("chilkat.pfx","test");
    if (success != true) {
        Log.i(TAG, certStore.lastErrorText());
        return;
        }

    CkCert cert = certStore.FindCertBySubject("Chilkat Software, Inc.");
    if (certStore.get_LastMethodSuccess() == false) {
        Log.i(TAG, certStore.lastErrorText());
        return;
        }

    CkPrivateKey pkey;
    pkey = cert.ExportPrivateKey();
    if (cert.get_LastMethodSuccess() == false) {
        Log.i(TAG, cert.lastErrorText());

        return;
        }

    // Get the private key in XML format:
    String pkeyXml = pkey.getXml();

    CkRsa rsa = new CkRsa();

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

        return;
        }

    // This example will sign a string, and receive the signature
    // as a base64url encoded string.  Therefore, set the encoding mode
    // to "base64url":
    rsa.put_EncodingMode("base64url");
    rsa.put_LittleEndian(false);

    String strData = "This is the string to be signed.";
    String strSig = rsa.signStringENC(strData,"sha256");

    Log.i(TAG, strSig);

  }

  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."
  }
}