Dart

Send Encrypted Email using RSAES-OAEP with AES-128 CBC and SHA256

See more SMTP Examples

Demonstrates how to send encrypted email using RSAES-OAEP with SHA256 and AES-128 content encryption.

Note: This example requires Chilkat v9.5.0.67 or greater.

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.

  // Load an RSA-based certificate.
  // (Encrypting an email only requires the public key.  Decrypting an email requires the private key.)
  final cert = CkCert();
  try {
    cert.loadFromFile('qa_data/rsaes-oaep/cert.pem');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final email = CkEmail();

  // Create a simple email.
  email.subject = 'Sample RSAES-OAEP Encrypted Email';
  email.body = 'Sample RSAES-OAEP Encrypted Email';
  email.from = 'support@chilkatsoft.com';

  // Add a recipient.
  // (The email is encrypted using the recipient's certificate.
  // If sending to multiple recipients, then the AddEncryptCert method would
  // need to be called once for each recipient's certificate.)
  email.addTo('Chilkat GMail', 'chilkat.support@gmail.com');

  // Set the email object properties to indicate the desired encryption.
  email.pkcs7CryptAlg = 'aes';
  // If AES-256 is desired, set the following property to 256.
  email.pkcs7KeyLength = 128;
  email.oaepPadding = true;
  // Other choices for the OAEP hash algorithm are "sha1", "sha384", and "sha512"
  email.oaepHash = 'sha256';

  // Provide the certificate to be used for encryption
  email.addEncryptCert(cert);

  // Don't forget to indicate that the email should be encrypted when sent..
  email.sendEncrypted = true;

  // The mailman object will do the RSAES-OAEP encryption when sending.
  final mailman = CkMailMan();

  // Set the SMTP settings for your email account on your mail server.
  mailman.smtpUsername = 'SMTP_LOGIN';
  mailman.smtpPassword = 'SMTP_PASSWORD';
  mailman.smtpHost = 'MY_SMTP_DOMAIN_OR_IP';
  mailman.smtpPort = 587;
  mailman.startTLS = true;

  // Send the email.  The mailman will encrypt the email as directed by the 
  // property settings of the email object.
  try {
    mailman.sendEmail(email);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  try {
    mailman.closeSmtpConnection();
  } on ChilkatException {
    print('Connection to SMTP server not closed cleanly.');
  }

  print('Mail Sent!');

  // -----------------------------------------------------------
  // This is an example of an RSAES-OAEP encrypted email
  // -----------------------------------------------------------

  // MIME-Version: 1.0
  // Date: Thu, 27 Apr 2017 08:43:32 -0500
  // Message-ID: <772DC039F0259C474BAC60240EA2BA2272402308@CHILKAT13>
  // Content-Type: application/pkcs7-mime; name="smime.p7m"; smime-type="enveloped-data"
  // Content-Transfer-Encoding: base64
  // X-Priority: 3 (Normal)
  // Subject: Sample RSAES-OAEP Encrypted Email
  // From: support@chilkatsoft.com
  // To: "Chilkat GMail" <chilkat.support@gmail.com>
  // Content-Disposition: attachment; filename="smime.p7m"
  // 
  // MIICWQYJKoZIhvcNAQcDoIICSjCCAkYCAQAxggGgMIIBnAIBADB1MGgxCzAJBgNVBAYTAlVTMQsw
  // CQYDVQQIDAJJTDEQMA4GA1UEBwwHV2hlYXRvbjEhMB8GA1UECgwYSW50ZXJuZXQgV2lkZ2l0cyBQ
  // dHkgTHRkMRcwFQYDVQQDDA5DaGlsa2F0V2lkZ2V0cwIJAMRwugDmvniwMBwGCSqGSIb3DQEBBzAP
  // oA0wCwYJYIZIAWUDBAIBBIIBABr0E1dKJjK0FAYRz/NCtJmBeB0nUxgcuBnhGPI/UeyGub3cCo+K
  // G5F4/iVTBJqVvYIF5+fvBnyTginwv7OiUiFWLyihiFC3NIyZJO22+XMHpNatCffTPZk10WswkTgk
  // G3ApnRvGQAaldnFD0Hs8drPU4vBvY9QsjT7YDGa6u2NMX+sr1ewEZArqU0mNfJ6RsEYd5FQbFEVF
  // qLmnz8Dt+yhoJlUtfUd8TXIeqHRJ7RxKOTSzlBZaAdTv2QX4oL9IcAgZeTg5iw+yRPkSAwWyg+I/
  // 7fybLsUpRGDHTGUU+AvHvP0kYKa1mkvccBVEC/+4hEyhpS1tWIR5ByY6vM76Z+8wgZwGCSqGSIb3
  // DQEHATAdBglghkgBZQMEAQIEEKqD0YDHX1NsVDaV32UczpeAcLteQyRPTV4hATjwcPiVelPfeWNs
  // xZKRGaEBqLM8+Y+V4ciCFoOlgJuOcP4m1PTHyilfzd+SCsKz5l1C7+sfPf36n2aacX6IWga59Bz5
  // QbWrOHDUT7O5PnGwKVgQFw3Cj4GrdPGWKcoqxB0HuKnj3WA=
}