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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.

PowerShell

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

# 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 = New-Object Chilkat.Pkcs11

$pkcs11.SharedLibPath = "aetpkss1.dll"

$success = $pkcs11.Initialize()
if ($success -eq $false) {
    $($pkcs11.LastErrorText)
    exit
}

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

# Open a session.
$readWrite = $true
$success = $pkcs11.OpenSession($slotID,$readWrite)
if ($success -eq $false) {
    $($pkcs11.LastErrorText)
    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 -eq $false) {
    $($pkcs11.LastErrorText)
    $success = $pkcs11.CloseSession()
    exit
}

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

$cert = New-Object Chilkat.Cert

# 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 -eq $true) {
    $("Cert with private key: " + $cert.SubjectCN)
}
else {
    $("No certificates having the intended key usage were found.")
}

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

# Revert to an unauthenticated session by calling Logout.
$success = $pkcs11.Logout()
if ($success -eq $false) {
    $($pkcs11.LastErrorText)
    $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 -eq $false) {
    $($pkcs11.LastErrorText)
    exit
}

$("Success.")