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(PHP ActiveX) Load Certificate from Smart Card by Key Usage

See more Certificates Examples

You may have a smartcard or USB token that contains only 2 certificates, one for signing, and one for authentication, and you wish to load the certificate for signing. This example demonstrates how to load the 1st certificate found on a smartcard that matches the intended key usage.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Cert')
$cert = new COM("Chilkat.Cert");

// If you know the smart card PIN, set it prior to loading from the smartcard/USB token.
$cert->SmartCardPin = '12345678';

// To load a certificate matching an intended key usage, specify the type of usage as shown below.
// 
// The possible key usage keywords are:
// 
// digitalsignature
// Use when the public key is used with a digital signature mechanism to support security services other than non-repudiation, certificate signing, or CRL signing. 
// A digital signature is often used for entity authentication and data origin authentication with integrity.

// nonrepudiation
// When a digital certificate's key usage includes "nonrepudiation," it implies that the certificate and its associated private key can be used to 
// create digital signatures that provide proof of the origin and integrity of the signed data, and the signer cannot later deny having signed the data.

// Other less common usages:

// certificatesigning
// keyencipherment
// dataencipherment
// crlsigning
// secureemail
// serverauthentication
// clientauthentication
// codesigning
// timestamping

$success = $cert->LoadFromSmartcard('keyusage=nonrepudiation');
if ($success == 0) {
    print $cert->LastErrorText . "\n";
    print 'Certificate not loaded.' . "\n";
    exit;
}

print 'Found: ' . $cert->SubjectDN . ' serial=' . $cert->SerialNumber . "\n";

?>

 

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