Dart

Find Certificate by Email Address

See more Cert Store Examples

Demonstrates how to find a certificate having the specified email address either within the cert's subject email, or the RFC822 name.

In an X.509 certificate, an email address can typically be located in two places:

1. RFC822 Name (Subject Alternative Name extension) -
   • The certificate may include an email address in the Subject Alternative Name (SAN) extension under the RFC822 Name field. This is a modern and preferred method because it allows for flexibility and alignment with security best practices.
   • To find it, Chilkat inspects the SAN extension in the certificate details.
2. Subject (Common Name or Email Address attribute) -
   • Older certificates may store the email address directly in the Subject field, typically under the Email Address attribute ("emailAddress") or, less commonly, the Common Name (CN).
   • This method is less preferred in modern standards but can still be encountered in legacy implementations. Chilkat also searches here for the email address.

Note: Requires Chilkat v10.1.2 or later.

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  final certStore = CkCertStore();

  // This opens the Current User certificate store on Windows,
  // On MacOS and iOS it opens the default Keychain.
  final readOnly = false;
  try {
    certStore.openCurrentUserStore(readOnly);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Find the certificate having the specified email address in either the RFC822 Name or in the Subject.
  final json = CkJsonObject();
  final emailAddress = 'joe@example.com';
  json.updateString('email', emailAddress);

  final cert = CkCert();
  try {
    certStore.findCert(json, cert);
    // Show the full distinguished name of the certificate.
    print('Found: ${cert.subjectDN}');
  } on ChilkatException {
    print('Not found.');
  }
}