(Android™) Add S/MIME Signature using PFX

Add a digital signature to a MIME message using the certificate + private key from a PFX file.

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.

    CkMime mime = new CkMime();

    // Load a PFX file into a certificate object.
    CkCert cert = new CkCert();
    String pfxFilepath = "pfxFiles/something.pfx";
    String pfxPassword = "secret";
    boolean success = cert.LoadPfxFile(pfxFilepath,pfxPassword);
    if (success == false) {
        Log.i(TAG, cert.lastErrorText());
        return;
        }

    success = mime.SetBodyFromPlainText("This is the plain-text MIME body.");

    mime.put_Charset("utf-8");
    mime.put_Encoding("quoted-printable");

    // Sign the MIME (adds a PKCS7 detached signature)
    success = mime.AddDetachedSignature(cert);
    if (success == false) {
        Log.i(TAG, mime.lastErrorText());
        return;
        }

    // Save the S/MIME to a file.
    success = mime.SaveMime("/temp/signedMime.txt");
    if (success == false) {
        Log.i(TAG, mime.lastErrorText());
        return;
        }

    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."
  }
}