Export Public Key to RSA DER, OpenSSL DER/PEM, XML

Demonstrates how to export a digital certificate's public key to RSA DER, OpenSSL PEM or DER, or to XML format.

<?php

$cert = new COM("Chilkat.Cert");

//  Th LoadByCommonName method searches the Windows
//  Current User Certificate Store and Local Machine Certificate
//  Store for a certificate whose common name (CN) matches
//  the argument:

$success = $cert->LoadByCommonName('Chilkat Software, Inc.');
if ($success == false) {
    print 'Failed to find certificate!' . "\n";
}
else {

    //  Get the PublicKey object:

    $pkey = $cert->ExportPublicKey();
    if (!(is_null($pkey))) {

        //  Export the public key to an RSA DER file:
        $pkey->SaveRsaDerFile('pubkey_rsa.der');

        //  Export to an OpenSSL DER file:
        $pkey->SaveOpenSslDerFile('pubkey_openssl.der');

        //  Export to an OpenSSL PEM file:
        $pkey->SaveOpenSslPemFile('pubkey_openssl.pem');

        //  Export to an XML file:
        $pkey->SaveXmlFile('pubkey.xml');

        //  Get OpenSSL PEM string:
        print 'OpenSSL PEM Public Key:' . "\n";
        print $pkey->getOpenSslPem() . "\n";

    }
    else {
        print 'No public key found!' . "\n";
    }

}

//  The Chilkat Certificate, Certificate Store, Private Key,
//  Public Key, and Key Container classes / objects are freeware.

//  They are used by and included with the Chilkat Email,
//  Crypt, S/MIME, and other commercial Chilkat components.

?>