Decrypt S/MIME with an Explicit Certificate and Private Key

See more MIME Examples

Loads a CMS/PKCS #7 encrypted S/MIME message and decrypts it back to the original MIME content.

Decrypt2 accepts the certificate and its private key directly as arguments.

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

    //  Decrypt using an explicitly supplied certificate and private key.  The 1st argument is the
    //  certificate and the 2nd is its private key.
    CkCert cert = new CkCert();
    success = cert.LoadFromFile("qa_data/recipient.cer");
    if (success == false) {
        Log.i(TAG, cert.lastErrorText());
        return;
        }

    CkPrivateKey privKey = new CkPrivateKey();
    success = privKey.LoadPemFile("qa_data/recipient_privkey.pem");
    if (success == false) {
        Log.i(TAG, privKey.lastErrorText());
        return;
        }

    success = mime.Decrypt2(cert,privKey);
    if (success == false) {
        Log.i(TAG, mime.lastErrorText());
        return;
        }

    String body = mime.getBodyDecoded();
    if (mime.get_LastMethodSuccess() == false) {
        Log.i(TAG, mime.lastErrorText());
        return;
        }

    Log.i(TAG, body);

  }

  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."
  }
}