Xbase++

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.

Xbase++

LOCAL nSuccess
LOCAL oPkcs11
LOCAL nSlotID
LOCAL nReadWrite
LOCAL nUserType
LOCAL cPin
LOCAL oCert

nSuccess := 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.

oPkcs11 := CreateObject("Chilkat.Pkcs11")

oPkcs11:SharedLibPath := "aetpkss1.dll"

nSuccess := oPkcs11:Initialize()
IF (nSuccess == 0)
    ? oPkcs11:LastErrorText
    oPkcs11:destroy()
    RETURN
ENDIF

//  Pass -1 for the slotID to open a session on the first non-empty slot.
nSlotID := -1

//  Open a session.
nReadWrite := 1
nSuccess := oPkcs11:OpenSession(nSlotID, nReadWrite)
IF (nSuccess == 0)
    ? oPkcs11:LastErrorText
    oPkcs11:destroy()
    RETURN
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".
nUserType := 1
cPin := "0000"
nSuccess := oPkcs11:Login(nUserType, cPin)
IF (nSuccess == 0)
    ? oPkcs11:LastErrorText
    nSuccess := oPkcs11:CloseSession()
    oPkcs11:destroy()
    RETURN
ENDIF

//  --------------------------------------------------------------------------

oCert := CreateObject("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:
nSuccess := oPkcs11:FindCert("keyUsage", "NonRepudiation,DigitalSignature", oCert)
IF (nSuccess == 1)
    ? "Cert with private key: " + oCert:SubjectCN
ELSE
    ? "No certificates having the intended key usage were found."
ENDIF

//  --------------------------------------------------------------------------

//  Revert to an unauthenticated session by calling Logout.
nSuccess := oPkcs11:Logout()
IF (nSuccess == 0)
    ? oPkcs11:LastErrorText
    nSuccess := oPkcs11:CloseSession()
    oPkcs11:destroy()
    oCert:destroy()
    RETURN
ENDIF

//  When finished, close the session.
//  It is important to close the session (memory leaks will occur if the session is not properly closed).
nSuccess := oPkcs11:CloseSession()
IF (nSuccess == 0)
    ? oPkcs11:LastErrorText
    oPkcs11:destroy()
    oCert:destroy()
    RETURN
ENDIF

? "Success."

oPkcs11:destroy()
oCert:destroy()