Dart

Set the Decryption Certificate for an Email

Demonstrates the Chilkat Email.SetDecryptCert method, which explicitly provides a certificate (with access to its private key) for decrypting a received encrypted email. Set the certificate before loading the encrypted message so Chilkat can decrypt it automatically. This example loads the certificate from a PFX, sets it, and then loads an encrypted email.

Background: Decrypting S/MIME email requires the recipient's private key. On Windows and macOS, Chilkat can find an installed certificate automatically, but when the key lives in a standalone PFX file you provide it explicitly with SetDecryptCert. A PFX (PKCS#12) bundles the certificate and its private key in one password-protected file. If the certificate and key are in separate files, use SetDecryptCert2 instead.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the SetDecryptCert method, which explicitly provides a certificate (with
  // access to its private key) for decrypting a received encrypted email.  Set the cert
  // before loading the encrypted email so it can be decrypted automatically.

  final email = CkEmail();

  // Load a certificate together with its private key from a PFX file.
  final cert = CkCert();
  try {
    cert.loadPfxFile('qa_data/certs/decryption.pfx', 'pfx_password');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Provide the certificate to use for decryption.
  try {
    email.setDecryptCert(cert);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Load the encrypted email; Chilkat decrypts it using the certificate.
  try {
    email.loadEml('qa_data/eml/encrypted.eml');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('ReceivedEncrypted = ${email.receivedEncrypted}');
  print('Decrypted = ${email.decrypted}');

  // Note: Paths such as "qa_data/..." are relative local filesystem paths,
  // relative to the current working directory of the running application.
}