(Android™) IMAP Read Encrypted Email

See more IMAP Examples

Demonstrates how to read encrypted email from an IMAP mailbox.

Reading encrypted email works the same as reading non-encrypted email. If the required certificate and private key are available on the system (e.g., in the macOS Keychain or Windows Certificate Store), Chilkat will automatically locate them, decrypt the email, and handle the process seamlessly.

Information about the original encrypted state of the email is available after it has been downloaded and decrypted.

Note: This example requires Chilkat v10.1.2 or later because it uses the Secrets class.

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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);

    CkImap imap = new CkImap();

    imap.put_Ssl(true);
    imap.put_Port(993);
    boolean success = imap.Connect("imap.example2.com");
    if (success != true) {
        Log.i(TAG, imap.lastErrorText());
        return;
        }

    // We'll get the IMAP email account's password from the Apple Keychain or Windows Credentials Manager.
    // See how we originally saved the email credentials to the Keychain here:
    // Save Email Credentials in Apple Keychain or Windows Credentials Manager
    CkSecrets secrets = new CkSecrets();

    // On Windows, this is the Windows Credentials Manager
    // On MacOS/iOS, it is the Apple Keychain
    secrets.put_Location("local_manager");

    // Specify the name of the secret.
    // service and username are required.
    // appName and domain are optional.
    // Note: The values are arbitrary and can be anything you want.
    CkJsonObject json = new CkJsonObject();
    json.UpdateString("appName","MyEmailApp");
    json.UpdateString("service","IMAP");
    json.UpdateString("domain","example2.com");
    json.UpdateString("username","jane@example2.com");

    String password = secrets.getSecretStr(json);
    if (secrets.get_LastMethodSuccess() == false) {
        Log.i(TAG, secrets.lastErrorText());
        return;
        }

    success = imap.Login("jane@example2.com",password);
    if (success != true) {
        Log.i(TAG, imap.lastErrorText());
        return;
        }

    // Select an IMAP mailbox
    success = imap.SelectMailbox("Inbox");
    if (success != true) {
        Log.i(TAG, imap.lastErrorText());
        return;
        }

    // This example: Send Encrypted Email using Certificate in Apple Keychain
    // sent an email with the subject "This email is encrypted".
    // Let's download an email with the word "encrypted" in the subject.
    CkMessageSet messageSet = imap.Search("SUBJECT encrypted",true);
    if (imap.get_LastMethodSuccess() == false) {
        Log.i(TAG, imap.lastErrorText());
        return;
        }

    if (messageSet.get_Count() == 0) {
        Log.i(TAG, "No messages found.");

        return;
        }

    // Reading encrypted email works the same as reading non-encrypted email. 
    // If the required certificate and private key are available on the system (e.g., in the macOS Keychain or Windows Certificate Store), 
    // Chilkat will automatically locate them, decrypt the email, and handle the process seamlessly.

    int uid = messageSet.GetId(0);
    CkEmail email = imap.FetchSingle(uid,true);
    if (imap.get_LastMethodSuccess() == false) {
        Log.i(TAG, imap.lastErrorText());

        return;
        }

    // Here we can show if the email was received encrypted, if it was successfully decrypted, and
    // which certificate was used to decrypt.
    Log.i(TAG, "Email received encrypted: " + String.valueOf(email.get_ReceivedEncrypted()));
    // Was it successfully decrypted?
    Log.i(TAG, "Successfully decrypted: " + String.valueOf(email.get_Decrypted()));
    // What cert was used to decrypt?
    Log.i(TAG, "Encrypted by: " + email.encryptedBy());
    CkCert cert = email.GetEncryptedByCert();
    if (email.get_LastMethodSuccess() == true) {
        Log.i(TAG, "Certificate DN: " + cert.subjectDN());

        }

    // Show the decrypted email body.
    Log.i(TAG, email.body());

    imap.Disconnect();

  }

  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."
  }
}