PHP

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.

Chilkat2 PHP

<?php

use Chilkat2\Cert;
use Chilkat2\CertStore;
use Chilkat2\JsonObject;

$certStore = new CertStore();

// This opens the Current User certificate store on Windows,
// On MacOS and iOS it opens the default Keychain.
$readOnly = false;
try {
    $certStore->OpenCurrentUserStore($readOnly);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

// Find the certificate having the specified email address in either the RFC822 Name or in the Subject.
$json = new JsonObject();
$email_address = 'joe@example.com';
$json->UpdateString('email', $email_address);

$cert = new Cert();
try {
    $certStore->FindCert($json, $cert);
    // Show the full distinguished name of the certificate.
    echo 'Found: ', $cert->SubjectDN, "\n";
} catch (\Chilkat2\Exception $e) {
    echo "Not found.\n";
}