Android™

Set the Certificate for Decrypting S/MIME Email

Demonstrates the Chilkat Imap.SetDecryptCert method, which specifies the certificate used to decrypt S/MIME messages downloaded by this Imap object. The only argument is a Cert that has access to its private key. This example loads the certificate from a PFX file.

Note: The certificate path is relative to the application's current working directory. Supply the path to your own certificate file.

Background: An S/MIME-encrypted message can only be read with the recipient's private key. Once a decrypt certificate is set, Chilkat decrypts matching messages automatically as they are fetched, so your code works with plaintext Email objects. Use SetDecryptCert2 instead when the certificate object does not itself carry the private key.

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// 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;

    //  Demonstrates the Imap.SetDecryptCert method, which specifies the certificate used to decrypt
    //  S/MIME messages downloaded by this Imap object.  The only argument is a Cert that has access
    //  to its private key.

    CkImap imap = new CkImap();

    imap.put_Ssl(true);
    imap.put_Port(993);

    success = imap.Connect("imap.example.com");
    if (success == false) {
        Log.i(TAG, imap.lastErrorText());
        return;
        }

    success = imap.Login("user@example.com","myPassword");
    if (success == false) {
        Log.i(TAG, imap.lastErrorText());
        return;
        }

    //  The PFX password is not hard-coded in source.  Insert code here to obtain it from an
    //  interactive prompt, environment variable, or a secrets vault.
    String pfxPassword;

    //  Load a certificate (with private key) from a PFX file.
    CkCert cert = new CkCert();
    success = cert.LoadPfxFile("qa_data/smime.pfx",pfxPassword);
    if (success == false) {
        Log.i(TAG, cert.lastErrorText());
        return;
        }

    //  Use it to automatically decrypt S/MIME messages that are subsequently downloaded.
    success = imap.SetDecryptCert(cert);
    if (success == false) {
        Log.i(TAG, imap.lastErrorText());
        return;
        }

    success = imap.Disconnect();
    if (success == false) {
        Log.i(TAG, imap.lastErrorText());
        return;
        }


  }

  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."
  }
}