Dart

Add S/MIME Signature using PFX

See more MIME Examples

Add a digital signature to a MIME message using the certificate + private key from a PFX file. 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();

  // Load a PFX file into a certificate object.
  final cert = CkCert();
  final pfxFilepath = 'pfxFiles/something.pfx';
  final pfxPassword = 'secret';
  try {
    cert.loadPfxFile(pfxFilepath, pfxPassword);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  mime.setBodyFromPlainText('This is the plain-text MIME body.');

  mime.charset = 'utf-8';
  mime.encoding = 'quoted-printable';

  // Sign the MIME (adds a PKCS7 detached signature)
  try {
    mime.addDetachedSignature(cert);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Save the S/MIME to a file.
  try {
    mime.saveMime('/temp/signedMime.txt');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('success!');
}