Encrypt MIME for a Recipient Certificate

See more MIME Examples

Demonstrates encrypting the current MIME entity for a single recipient using the Mime.Encrypt method. The entity is replaced with CMS/PKCS #7 encrypted S/MIME that only the holder of the recipient's private key can read.

The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

// 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);

    boolean success = false;

    CkMime mime = new CkMime();
    success = mime.SetBodyFromPlainText("This message will be encrypted.");
    if (success == false) {
        Log.i(TAG, mime.lastErrorText());
        return;
        }

    //  Load the recipient's certificate (public key only is sufficient for encrypting).
    CkCert cert = new CkCert();
    success = cert.LoadFromFile("qa_data/recipient.cer");
    if (success == false) {
        Log.i(TAG, cert.lastErrorText());
        return;
        }

    //  Encrypt for the recipient.  The entity is replaced with CMS/PKCS #7 encrypted S/MIME that only
    //  the holder of the recipient's private key can decrypt.  The certificate must be RSA-based.
    success = mime.Encrypt(cert);
    if (success == false) {
        Log.i(TAG, mime.lastErrorText());
        return;
        }

    success = mime.SaveMime("qa_output/encrypted.eml");
    if (success == false) {
        Log.i(TAG, mime.lastErrorText());
        return;
        }

    Log.i(TAG, "Message encrypted.");

  }

  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."
  }
}