Java

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.

Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    CkCertStore certStore = new CkCertStore();

    // This opens the Current User certificate store on Windows,
    // On MacOS and iOS it opens the default Keychain.
    boolean readOnly = false;
    success = certStore.OpenCurrentUserStore(readOnly);
    if (success == false) {
        System.out.println(certStore.lastErrorText());
        return;
        }

    // Find the certificate having the specified email address in either the RFC822 Name or in the Subject.
    CkJsonObject json = new CkJsonObject();
    String email_address = "joe@example.com";
    json.UpdateString("email",email_address);

    CkCert cert = new CkCert();
    success = certStore.FindCert(json,cert);
    if (success == true) {
        // Show the full distinguished name of the certificate.
        System.out.println("Found: " + cert.subjectDN());
        }
    else {
        System.out.println("Not found.");
        }
  }
}