(Perl) Find Certificate by Email Address

See more Cert Store Examples

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.

Chilkat Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux

use chilkat();

$certStore = chilkat::CkCertStore->new();

# This opens the Current User certificate store on Windows,
# On MacOS and iOS it opens the default Keychain.
$readOnly = 0;
$success = $certStore->OpenCurrentUserStore($readOnly);
if ($success == 0) {
    print $certStore->lastErrorText() . "\r\n";
    exit;
}

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

$cert = chilkat::CkCert->new();
$success = $certStore->FindCert($json,$cert);
if ($success == 1) {
    # Show the full distinguished name of the certificate.
    print "Found: " . $cert->subjectDN() . "\r\n";
}
else {
    print "Not found." . "\r\n";
}