Dart

Send aes-gcm authEnvelopedData Encrypted Email

See more SMTP Examples

Note: This example requires Chilkat v10.0.0 or later

Demonstrates how to send encrypted email using 128-bit AES in GCM mode.

"AES-GCM" (Advanced Encryption Standard - Galois/Counter Mode) is a cryptographic algorithm that provides both encryption and integrity protection (authentication). When used in the context of email security with "authEnvelopedData", it often refers to a method of securely sending encrypted and authenticated email content.

Here’s a brief breakdown:

• AES-GCM: Combines symmetric encryption (AES) with authentication, ensuring both the confidentiality and integrity of the message. It generates an authentication tag to detect any unauthorized changes.
• authEnvelopedData: Refers to a type of structure used in secure email protocols (like S/MIME) to package encrypted content. It contains the encrypted data and associated encrypted session keys.
• Email Security: When applied to emails, AES-GCM ensures the email content is encrypted (confidential) and also tamper-resistant (authenticated), with the encryption keys typically shared securely using asymmetric encryption (e.g., public key infrastructure, or PKI).

In short, AES-GCM with "authEnvelopedData" provides a way to encrypt and authenticate emails, making them confidential and resistant to tampering.

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // This example requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  // The mailman object is used for sending and receiving email.
  final mailman = CkMailMan();

  mailman.smtpHost = 'smtp.example.com';

  mailman.smtpUsername = 'my_smtp_login';
  mailman.smtpPassword = 'my_smtp_password';

  // The typical SMTP ports are 465 for implicit SSL/TLS or 587 for explicit SSL/TLS
  mailman.smtpPort = 465;
  mailman.smtpSsl = true;

  // Use the recipient's certificate for encryption.
  final cert = CkCert();
  try {
    cert.loadFromFile('c:/someDir/recipient_cert.cer');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final email = CkEmail();

  email.subject = 'This email is encrypted';
  email.body = 'This is AES-GCM encrypted mail';
  email.from = 'Mary <mary@example1.com>';
  email.addTo('Joe', 'joe@example.com');

  // Specify that AES-GCM w/ authEnvelopedData is to be used. 
  // Also specify other params..
  email.pkcs7CryptAlg = 'aes-gcm';
  email.pkcs7KeyLength = 128;
  email.oaepPadding = true;
  email.oaepHash = 'sha256';
  email.oaepMgfHash = 'sha256';

  // Indicate the email is to be sent encrypted.
  email.sendEncrypted = true;

  // Specify the certificate to be used for encryption.
  email.setEncryptCert(cert);

  try {
    mailman.sendEmail(email);
    print('Mail Sent!');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
  }
}