Dart

Add a PFX Source (BinData) for S/MIME Decryption

Demonstrates the Chilkat Imap.AddPfxSourceBd method, which adds PFX data held in a BinData as a source of certificates and private keys for S/MIME processing. The first argument is the BinData and the second is the PFX password. Call it once for each additional source.

Note: The certificate path is relative to the application's current working directory. Supply the path to your own certificate file.

Background: When downloading encrypted (S/MIME) email, Chilkat needs the recipient's private key to decrypt it. Adding one or more PFX sources gives Chilkat a pool of keys to search; the matching key is used automatically as messages are fetched. The BinData form is handy when the PFX comes from memory — a database blob or a downloaded buffer — rather than a file on disk. On Windows and macOS the system certificate stores are also searched automatically.

Chilkat Dart Downloads

Download Chilkat for Dart

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the Imap.AddPfxSourceBd method, which adds PFX data (from a BinData) as a
  // source of certificates and private keys for S/MIME decryption.  The 1st argument is the
  // BinData containing the PFX, and the 2nd is the PFX password.

  final imap = CkImap();

  imap.ssl = true;
  imap.port = 993;

  try {
    imap.connect('imap.example.com');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  try {
    imap.login('user@example.com', 'myPassword');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Load the PFX data into a BinData.
  final bdPfx = CkBinData();
  try {
    bdPfx.loadFile('qa_data/smime.pfx');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // The PFX password is not hard-coded in source.  Insert code here to obtain it from an
  // interactive prompt, environment variable, or a secrets vault.
  final pfxPassword = '';

  // Add the PFX as a source for S/MIME certificates and private keys.  Call once per source.
  try {
    imap.addPfxSourceBd(bdPfx, pfxPassword);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Messages downloaded after this are automatically decrypted when a matching key is found.

  try {
    imap.disconnect();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }
}