(Android™) Load Signed and/or Encrypted Email and Unwrap Security Layers

The LoadEml method loads an email (.eml file containing the MIME of an email) and automatically unwraps the digital signature and encryption security layers. A program can then examine the properties of the email object to see what was unwrapped.

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);

    CkEmail email = new CkEmail();

    //  Provide PFX/.p12 files for any certs+keys needed for decryption.
    //  Signature verification does not need anything extra.
    //  (Also, Chilkat will automatically find and use pre-installed certs + private keys needed for decryption
    //  on a Windows system.)
    boolean success = email.AddPfxSourceFile("/pfxFiles/certs_and_keys_1.pfx","pfxPassword1");
    if (success != true) {
        Log.i(TAG, email.lastErrorText());
        return;
        }

    success = email.AddPfxSourceFile("/pfxFiles/certs_and_keys_2.pfx","pfxPassword2");
    if (success != true) {
        Log.i(TAG, email.lastErrorText());
        return;
        }

    //  ...

    //  Load a potentially signed and/or encrypted email.
    success = email.LoadEml("someDir/someEmail.eml");

    //  If the email was signed and/or encrypted, it was "unwrapped", i.e.
    //  the email is already decrypted and in a state as if it were never signed or encrypted.

    //  You may check to see if the email was received encrypted or signed, and if so,
    //  whether it was successfully unwrapped and who signed or encrypted it:
    if (email.get_ReceivedEncrypted() == true) {

        Log.i(TAG, "This email was encrypted.");
        if (email.get_Decrypted() == true) {
            Log.i(TAG, "This email was successfully decrypted.  It was encrypted by:");
            Log.i(TAG, email.encryptedBy());
            }
        else {
            Log.i(TAG, "This email was not decrypted.");
            }

        }

    if (email.get_ReceivedSigned() == true) {

        Log.i(TAG, "This email was signed.");
        if (email.get_SignaturesValid() == true) {
            Log.i(TAG, "The signature was verified.  It was signed by:");
            Log.i(TAG, email.signedBy());
            }
        else {
            Log.i(TAG, "The signature verification failed.");
            }

        }

    //  At this point, the contents of the email, including attachments, can be accessed normally..

  }

  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."
  }
}