Export Private Key to PKCS8, PEM, DER, XML

Demonstrates how to export a digital certificate's private key to RSA PEM or DER, PKCS8 PEM or DER, or XML.

<?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 PrivateKey object:

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

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

        //  Export to a PKCS8 DER file:
        $pkey->SavePkcs8File('pkey_pkcs8.der');

        //  Export to an RSA PEM file:
        $pkey->SaveRsaPemFile('pkey_rsa.pem');

        //  Export to a PKCS8 PEM file:
        $pkey->SavePkcs8PemFile('pkey_pkcs8.pem');

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

        //  Get PKCS8 PEM string:
        print 'PKCS8 PEM Private Key:' . "\n";
        print $pkey->getPkcs8Pem() . "\n";

        //  Get RSA PEM string:
        print 'RSA PEM Private Key:' . "\n";
        print $pkey->getRsaPem() . "\n";

    }
    else {
        print 'No private 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.

?>