Decrypt S/MIME using a Certificate with Private Key Access

See more MIME Examples

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

DecryptUsingCert takes a single certificate that already has access to its associated private key, for example a certificate loaded from a PFX.

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 a certificate that already provides access to its private key (for example loaded
    //  from a PFX).  The only argument is the certificate.
    String pfxPassword = "myPfxPassword";
    CkCert cert = new CkCert();
    success = cert.LoadPfxFile("qa_data/recipient.pfx",pfxPassword);
    if (success == false) {
        Log.i(TAG, cert.lastErrorText());
        return;
        }

    success = mime.DecryptUsingCert(cert);
    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."
  }
}