Perl

PKCS11 Find Certificate with Key Usage on Smart Card or USB Token

See more PKCS11 Examples

Demonstrates how to find and return the 1st certificate on a smart card or USB token with a desired intended key usage.

Note: This example requires Chilkat v9.5.0.91 or later.

Perl

use chilkat();

$success = 0;

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

# Note: Chilkat's PKCS11 implementation runs on Windows, Linux, Mac OS X, and other supported operating systems.

$pkcs11 = chilkat::CkPkcs11->new();

$pkcs11->put_SharedLibPath("aetpkss1.dll");

$success = $pkcs11->Initialize();
if ($success == 0) {
    print $pkcs11->lastErrorText() . "\r\n";
    exit;
}

# Pass -1 for the slotID to open a session on the first non-empty slot.
$slotID = -1;

# Open a session.
$readWrite = 1;
$success = $pkcs11->OpenSession($slotID,$readWrite);
if ($success == 0) {
    print $pkcs11->lastErrorText() . "\r\n";
    exit;
}

# Make it an authenticated session by calling Login.
# 
# If we don't authenticate, then we won't be able to see the private keys, and thus
# we won't know which certificates have an associated private key stored on the smart card.

# The smart card PIN is passed to the Login method.
# userType 1 indicates a "Normal User".
$userType = 1;
$pin = "0000";
$success = $pkcs11->Login($userType,$pin);
if ($success == 0) {
    print $pkcs11->lastErrorText() . "\r\n";
    $success = $pkcs11->CloseSession();
    exit;
}

# --------------------------------------------------------------------------

$cert = chilkat::CkCert->new();

# Find a certificate with an intended key usage.
# Possible key usages to find are:
# 
# DigitalSignature
# NonRepudiation
# KeyEncipherment
# DataEncipherment
# CertificateSigning
# CrlSigning
# 
# To find a cert having any one of several usages, pass a comma-separated list of usages:
$success = $pkcs11->FindCert("keyUsage","NonRepudiation,DigitalSignature",$cert);
if ($success == 1) {
    print "Cert with private key: " . $cert->subjectCN() . "\r\n";
}
else {
    print "No certificates having the intended key usage were found." . "\r\n";
}

# --------------------------------------------------------------------------

# Revert to an unauthenticated session by calling Logout.
$success = $pkcs11->Logout();
if ($success == 0) {
    print $pkcs11->lastErrorText() . "\r\n";
    $success = $pkcs11->CloseSession();
    exit;
}

# When finished, close the session.
# It is important to close the session (memory leaks will occur if the session is not properly closed).
$success = $pkcs11->CloseSession();
if ($success == 0) {
    print $pkcs11->lastErrorText() . "\r\n";
    exit;
}

print "Success." . "\r\n";