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

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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.

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Local $bSuccess = 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.

$oPkcs11 = ObjCreate("Chilkat.Pkcs11")

$oPkcs11.SharedLibPath = "aetpkss1.dll"

$bSuccess = $oPkcs11.Initialize()
If ($bSuccess = False) Then
    ConsoleWrite($oPkcs11.LastErrorText & @CRLF)
    Exit
EndIf

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

; Open a session.
Local $bReadWrite = True
$bSuccess = $oPkcs11.OpenSession($iSlotID,$bReadWrite)
If ($bSuccess = False) Then
    ConsoleWrite($oPkcs11.LastErrorText & @CRLF)
    Exit
EndIf

; 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".
Local $iUserType = 1
Local $sPin = "0000"
$bSuccess = $oPkcs11.Login($iUserType,$sPin)
If ($bSuccess = False) Then
    ConsoleWrite($oPkcs11.LastErrorText & @CRLF)
    $bSuccess = $oPkcs11.CloseSession()
    Exit
EndIf

; --------------------------------------------------------------------------

$oCert = ObjCreate("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:
$bSuccess = $oPkcs11.FindCert("keyUsage","NonRepudiation,DigitalSignature",$oCert)
If ($bSuccess = True) Then
    ConsoleWrite("Cert with private key: " & $oCert.SubjectCN & @CRLF)
Else
    ConsoleWrite("No certificates having the intended key usage were found." & @CRLF)
EndIf

; --------------------------------------------------------------------------

; Revert to an unauthenticated session by calling Logout.
$bSuccess = $oPkcs11.Logout()
If ($bSuccess = False) Then
    ConsoleWrite($oPkcs11.LastErrorText & @CRLF)
    $bSuccess = $oPkcs11.CloseSession()
    Exit
EndIf

; When finished, close the session.
; It is important to close the session (memory leaks will occur if the session is not properly closed).
$bSuccess = $oPkcs11.CloseSession()
If ($bSuccess = False) Then
    ConsoleWrite($oPkcs11.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("Success." & @CRLF)