Dart

PKCS7 Encrypt MIME

See more MIME Examples

Encrypt MIME using a digital certificate to create PKCS7 encrypted S/MIME. 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.

  final mime = CkMime();

  // Build a simple MIME message to be encrypted:
  mime.addHeaderField('Content-Type', 'text/plain');
  mime.addHeaderField('abc', '123');
  mime.setBody('This is a test');

  // A digital certificate is required to create PKCS7 encrypted MIME.
  // It can come from a variety of sources: .cer file, .pfx file, PEM files,
  // an in-memory representation, or directly from a Windows
  // registry-based certificate store.

  // This example will load a certificate object from a .cer file.
  // Note: Only the public-key is required to encrypt.  (Decryption
  // requires a private key.)

  final cert = CkCert();
  try {
    cert.loadFromFile('myCert.cer');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Encrypt the MIME:
  try {
    mime.encrypt(cert);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Display the MIME:
  print(mime.getMime());

  // The resulting S/MIME looks something like this:

  // abc: 123
  // Content-Disposition: attachment; filename="smime.p7m";
  // Content-Transfer-Encoding: base64
  // Content-Type: application/x-pkcs7-mime;
  //  name="smime.p7m";
  // 
  // MIICAQYJKoZIhvcNAQcDoIIB8jCCAe4CAQAxggGFMIIBgQIBADBpMFUxCzAJBgNVBAYTAlpBMSUw
  // IwYDVQQKExxUaGF3dGUgQ29uc3VsdGluZyAoUHR5KSBMdGQuMR8wHQYDVQQDExZUaGF3dGUgQ29k
  // ZSBTaWduaW5nIENBAhB4ouTcAmLszrGi170k1deSMA0GCSqGSIb3DQEBAQUABIIBABz59iwVufLZ
  // QIPs0whUYMtBjIQxg5IOCxpoKJeJmLVzu9Q5Q1poxG9uYOveybS9c4wbl5A0DFfKTW5O4HhHcOHW
  // TgcH4iqdwhiFWm/q9d5rjceJWBFQsGOcgoXSU/U2Xp+N47/+Pqyc5XJbxKnOc4YhPzO320JZsNB6
  // p1NGk5SNnWqgbUDmEnfH8ZPHSV7dNi2aiFALYTyLjyp0lqJCsdZ524OPTZFfusrl/9ibPAW7jKuI
  // FgDCcBtRJvolVF8iIHxaTw4rhk0qb1KWzxvB5j9HSLdyIKIPhZbxeS10bx18YkSsBlKfdKRalQag
  // 3oWSRdsK9/N75YHG8Pm+x9BOHUAwYAYJKoZIhvcNAQcBMBkGCCqGSIb3DQMCMA0CAToECAb+toBW
  // txZigDhGZKSpUpuTiWvvSMemX/c79sSnMpuefVwGKFTDgXVLE2SoD5a9Yh5vcG7Mhl2IkilVwOMc
  // fi23+g==
}