Dart

PKCS7 Encrypt using Multiple Certificates

See more MIME Examples

Encrypts MIME using multiple digital certificates. Calls AddEncryptCert once per certificate, followed by a call to EncryptN. The MIME may be decrypted by any owner of one of the certificates + its associated private key. 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.

  // Load one cert from a .cer file:
  final cert1 = CkCert();
  try {
    cert1.loadFromFile('myCert.cer');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Load another cert ...
  final cert2 = CkCert();
  try {
    cert2.loadFromFile('anotherCert.cer');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Tell the MIME object to use these certs for encrypting:
  // (AddEncryptCert shouldn't fail if we already know it contains
  // a valid certificate..)
  mime.addEncryptCert(cert1);
  mime.addEncryptCert(cert2);

  // Encrypt the MIME:
  try {
    mime.encryptN();
  } 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";
  // 
  // MIID4QYJKoZIhvcNAQcDoIID0jCCA84CAQAxggNlMIIBgQIBADBpMFUxCzAJBgNVBAYTAlpBMSUw
  // IwYDVQQKExxUaGF3dGUgQ29uc3VsdGluZyAoUHR5KSBMdGQuMR8wHQYDVQQDExZUaGF3dGUgQ29k
  // ZSBTaWduaW5nIENBAhB4ouTcAmLszrGi170k1deSMA0GCSqGSIb3DQEBAQUABIIBAKnOPgmISrNH
  // Hd+zESvH5dl5TvBLCxLuIuH6cuZdowHzCqAUzaYFdn1rp88Vvu2x3s6WOvzje/+dE1x0YjEpeqxd
  // ufehlb6Jl9ucxSMWARWMxWGxu0eZGJVt+SBBrVddqdtrIU9lVt5rBxkU67P8PxgbwdNCX3qJENRO
  // P/rvp5ngoCkpIxeGqSkPvWv+CA3IXS8FPs8Sl4HNPiAj3e9RBm2MxI1u4cn1HvgGg8yHgHLMG5JF
  // LzGsmotSQaqEwq2JtOlkjfOwEI+ZhbWQupj6gen2aGc5sW3J26H1usxtV2TQ7WRRxqnZGmlh20dW
  // 4lo3kITYI+iapGlJXmrlDYh2CjkwggHcAgEAMIHDMIGuMQswCQYDVQQGEwJVUzELMAkGA1UECBMC
  // VVQxFzAVBgNVBAcTDlNhbHQgTGFrZSBDaXR5MR4wHAYDVQQKExVUaGUgVVNFUlRSVVNUIE5ldHdv
  // cmsxITAfBgNVBAsTGGh0dHA6Ly93d3cudXNlcnRydXN0LmNvbTE2MDQGA1UEAxMtVVROLVVTRVJG
  // aXJzdC1DbGllbnQgQXV0aGVudGljYXRpb24gYW5kIEVtYWlsAhAj50QEWUPwA+jXOiL8sMwXMA0G
  // CSqGSIb3DQEBAQUABIIBAFQ1cydWC4M9tdgAlCN03kP8eyuXajwT+5ByhOcJhjuCABg7U8w4Rx28
  // braGqV+TCBxjyMsqD0KcW49VT6ZHMpQ1yN8R72qDsidmfm9w3u0jVgsaaBkTJXMy4COY/3cZWmYG
  // dL3Qty8uFeQYddytt6UPJpGJZYsrdFG2doe6qHiRtAxxPrd0GmQRcGvxyDdsojkoBlTMbfwaXOI3
  // xepR/oh60x/3npUCsl2VpNPfo6oZoej6YZGEuz2MvuWvXVhvuqoTqXGwGDgYMxwTbPwklqZiJtsK
  // r5Ep3NlWAQX8MGWL0H+NC22cqJuqUCL05yqyAv+JMCpZGAwOVb/wiVNjpAIwYAYJKoZIhvcNAQcB
  // MBkGCCqGSIb3DQMCMA0CAToECA5NAJY12cU+gDgZFUc+nsQUUbiR1GH8iBVLI+XWlja9TXEe1Hzt
  // NlsOylRVBDzjNxUtX/zC0YR7bs+2Cf4JbyuMOA==
}