(Java) Send Encrypted Email using Certificate in Apple Keychain

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Send encrypted (S/MIME) email using a certificate found in the Apple Keychain.

Note: This example requires Chilkat v10.1.2 or later.

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    CkEmail email = new CkEmail();
    email.put_Subject("This email is encrypted");
    email.put_Body("This is a S/MIME encrypted mail");
    email.put_From("Joe <joe@example.com>");

    // Emails are encrypted using the recipient's certificate.
    String recipientEmailAddr = "jane@example2.com";
    email.AddTo("",recipientEmailAddr);

    // Indicate that the email is to be sent encrypted.
    email.put_SendEncrypted(true);

    CkCert cert = new CkCert();

    // -----------------------------------------------
    // This example requires Chilkat v10.1.2 or later.
    // -----------------------------------------------

    // The recipient's certificate is used to encrypt.
    // This will load the certificate from the Apple Keychain.
    boolean success = cert.LoadByEmailAddress(recipientEmailAddr);
    if (success != true) {
        System.out.println(cert.lastErrorText());
        return;
        }

    // Specify the certificate to be used for encryption.
    success = email.SetEncryptCert(cert);
    email.put_SendEncrypted(true);

    CkMailMan mailman = new CkMailMan();
    mailman.put_SmtpHost("smtp.example.com");
    mailman.put_SmtpUsername("joe@example.com");
    mailman.put_SmtpPort(587);
    mailman.put_StartTLS(true);

    // We'll get the SMTP password from the Apple Keychain.
    // 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","SMTP");
    json.UpdateString("domain","example.com");
    json.UpdateString("username","joe@example.com");

    mailman.put_SmtpPassword(secrets.getSecretStr(json));

    // Send the encrypted email.
    // The email is encrypted and sent within the SendEmail function.
    success = mailman.SendEmail(email);
    if (success != true) {
        System.out.println(mailman.lastErrorText());
        return;
        }

    System.out.println("Encrypted email sent!");
  }
}