Dart

Encrypt MIME using RSAES-OAEP with SHA256 and AES-128 content encryption

See more MIME Examples

Demonstrates how to encrypt MIME 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 requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  final mime = CkMime();

  // Create a MIME message to encrypt.
  mime.newMultipartMixed();
  mime.addHeaderField('someHeader1', 'Some value 1');
  mime.addHeaderField('someHeader2', 'Some value 2');

  final part0 = CkMime();
  part0.addHeaderField('hdrA', 'Some value A');
  part0.addHeaderField('hdrB', 'Some value B');
  part0.contentType = 'text/plain';
  part0.setBody('This is the plain-text body.');

  final part1 = CkMime();
  part1.addHeaderField('hdrX', 'Some value X');
  part1.addHeaderField('hdrY', 'Some value Y');
  part1.contentType = 'text/xml';
  part1.setBody('<a>This is the XML body</a>');

  mime.appendPart(part0);
  mime.appendPart(part1);

  // The MIME to be encrypted:
  final sbMime = CkStringBuilder();
  mime.getMimeSb(sbMime);
  print(sbMime.getAsString());

  // 	Content-Type: multipart/mixed; boundary="------------080303020600020604010008"
  // 	someHeader1: Some value 1
  // 	someHeader2: Some value 2
  // 
  // 	--------------080303020600020604010008
  // 	hdrA: Some value A
  // 	hdrB: Some value B
  // 	Content-Type: text/plain
  // 
  // 	This is the plain-text body.
  // 	--------------080303020600020604010008
  // 	hdrX: Some value X
  // 	hdrY: Some value Y
  // 	Content-Type: text/xml
  // 
  // 	<a>This is the XML body</a>
  // 	--------------080303020600020604010008--
  // 

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

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

  // Encrypt the MIME (to create S/MIME, which stands for "Secure MIME")
  try {
    mime.encrypt(cert);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('---------------');
  print('Encrypted MIME:');
  print('---------------');
  print(mime.getMime());

  print('Success.');

  // ---------------------------------------------------
  // This is sample output for RSAES-OAEP encrypted MIME:
  // ---------------------------------------------------

  // Content-Type: application/x-pkcs7-mime; name="smime.p7m"; smime-type="enveloped-data"
  // someHeader1: Some value 1
  // someHeader2: Some value 2
  // Content-Disposition: attachment; filename="smime.p7m"
  // Content-Transfer-Encoding: base64
  // 
  // MIIDvAYJKoZIhvcNAQcDoIIDrTCCA6kCAQAxggGgMIIBnAIBADB1MGgxCzAJBgNVBAYTAlVTMQsw
  // CQYDVQQIDAJJTDEQMA4GA1UEBwwHV2hlYXRvbjEhMB8GA1UECgwYSW50ZXJuZXQgV2lkZ2l0cyBQ
  // dHkgTHRkMRcwFQYDVQQDDA5DaGlsa2F0V2lkZ2V0cwIJAMRwugDmvniwMBwGCSqGSIb3DQEBBzAP
  // oA0wCwYJYIZIAWUDBAIBBIIBAFaUL1ga1bOrdqYKcMm+FHUacBvzfBxk0fnPA0AMBdN8BvTWT3CN
  // YuqBhjOGyq0FpYD9pVZybUuFMCVsVyIW2O62HnsOK58YaPEUUcdH2sI+yjqX9UAn0P0nVDSsVdeK
  // W8x9kMfZg+3UP+y1q+lu7VRJO3f2C9oLQpTkc4VW4n7UOcUI0waykLCjCTL8lFDb7/J3GeuMKyhH
  // 5riNz50kpbzqn7m2Ks9yA+QmcTdXclclGFr2vwEUFzSdT2pxh/vaUrogCxkYWbQ2eV7vZg6O4kV0
  // aqHBqySkPTAzHKiHH8K8GVdlTuJ8350CpICa4T8w7/Ht5I7dyOPPKy4C+rVtrvcwggH+BgkqhkiG
  // 9w0BBwEwHQYJYIZIAWUDBAECBBDTC2WNBN+z2I47/4Feu9YqgIIB0MZvl3nC/q/Wzil6HtfQTr12
  // Q5moHY+ORzAa1P9XvX2ZUFhW530mV395mQw/A4o4ekmX9eRPEZquYzZPLT8hNeZIuNdhpcSQUmad
  // rKnKkR0wKJ3jJ3LhOIohVBQSYs8kVDZKq6lJBIznlsurFelZoNEhyRschhteDZx5rb7fCe8c2+/O
  // DHxaqaHCAzm/Bd7kcg6FFfuTZy3tu0PgP5IsXN4OFA3kkvwjAs4XsVS8jdIcmDNBkYieE8WmJOIm
  // Mz7mh/CHWLgWfGKa0Dkb9RcbFgLwYNT3GzuXFw9XPbKkEZjEAtJajWbN6P0WQl96YYd9qZxUpGxZ
  // zjTHEYzViUdUXolfpLufttrRXyxN1RFWhNFMFbv66xYqklMSgpdM/Mbk+EuvX6eXayDPvDBpfYMw
  // NoRAzv1Ony2c0ez9rBemJICicxAzpuvHbRxdjYs63Dnv+TYgpBK12AxWWpPIjXvw0WQKgTC3Tg8s
  // EnuGhpENqso/clJBEBSn4+2WhYtYbdI5sVme67lvqQl1Xxy3r18SWaQbyDOwgYi1E+54lMDOxMy0
  // y0FPHk5pP45DnXWj+XORPp5LhuZr5mf62YOXSSUwR5P0cXy4Rc+pN5lhRQPCf5z2
}