(Visual FoxPro) PKCS11 Find Specific Certificate on Smart Card or USB Token

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This example code shows how to find a particular certificate on a smart card or USB token.

Note: This example requires Chilkat v9.5.0.88 or later.

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LOCAL loPkcs11
LOCAL lnSuccess
LOCAL lnSlotID
LOCAL lnReadWrite
LOCAL lnUserType
LOCAL lcPin
LOCAL loCert

* 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.

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Pkcs11')
loPkcs11 = CreateObject('Chilkat.Pkcs11')

* Set your shared lib path -- either a full path to the DLL, .so, or .dylib,
* or just the filename if the driver is in a location that can be automatically found. (Such as in C:\Windows\System32)
loPkcs11.SharedLibPath = "C:/Program Files (x86)/Gemalto/IDGo 800 PKCS#11/IDPrimePKCS1164.dll"

lnSuccess = loPkcs11.Initialize()
IF (lnSuccess = 0) THEN
    ? loPkcs11.LastErrorText
    RELEASE loPkcs11
    CANCEL
ENDIF

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

* Open a session.
lnReadWrite = 1
lnSuccess = loPkcs11.OpenSession(lnSlotID,lnReadWrite)
IF (lnSuccess = 0) THEN
    ? loPkcs11.LastErrorText
    RELEASE loPkcs11
    CANCEL
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".
lnUserType = 1
lcPin = "0000"
lnSuccess = loPkcs11.Login(lnUserType,lcPin)
IF (lnSuccess = 0) THEN
    ? loPkcs11.LastErrorText
    lnSuccess = loPkcs11.CloseSession()
    RELEASE loPkcs11
    CANCEL
ENDIF

* --------------------------------------------------------------------------
* The FindCert method can find a particular certificate in a number of different ways.
* I'll demonstrate some common ways..

* 1) In many cases you'll be working with a smart card that contains one certificate that is to be used for 
* signing, and it is the certificate that is associated with the private key also stored on the smart card (or USB token).
* There may be other certificates on the card, but these are the issuer certificates in the chain of authentication.
* You're just interested in getting the certificate with the private key.
* You can do it like this:
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Cert')
loCert = CreateObject('Chilkat.Cert')
* Pass the keyword "privateKey" in the 1st argument, and an empty string in the 2nd arg.
* This returns the 1st certificate that has a private key.
lnSuccess = loPkcs11.FindCert("privateKey","",loCert)
IF (lnSuccess = 1) THEN
    ? "Cert with private key: " + loCert.SubjectCN
ELSE
    ? "No certificates having a private key were found."
ENDIF

* 2) Find a certificate by the Subject Common Name
lnSuccess = loPkcs11.FindCert("subjectCN","Chil application account (8c9be8e0-5544-4cd0-9062-290fbff353a7)",loCert)
IF (lnSuccess = 1) THEN
    ? "Found: " + loCert.SubjectCN
ELSE
    ? "Not found: " + loCert.SubjectCN
ENDIF

* 3) Find a certificate by hex serial number
lnSuccess = loPkcs11.FindCert("serial","5087bf1feda006af54a02f23a851104948acc26f",loCert)
IF (lnSuccess = 1) THEN
    ? "Found: " + loCert.SerialNumber
ELSE
    ? "Not found: " + loCert.SerialNumber
ENDIF

* 4) Find a certificate by hex serial number and Issuer Common Name
lnSuccess = loPkcs11.FindCert("serial:issuerCN","5087bf1feda006af54a02f23a851104948acc26f:Ibanity Production Third Party Application CA",loCert)
IF (lnSuccess = 1) THEN
    ? "Found: " + loCert.SubjectCN
ELSE
    ? "Not found: " + loCert.SubjectCN
ENDIF

* --------------------------------------------------------------------------

* Revert to an unauthenticated session by calling Logout.
lnSuccess = loPkcs11.Logout()
IF (lnSuccess = 0) THEN
    ? loPkcs11.LastErrorText
    lnSuccess = loPkcs11.CloseSession()
    RELEASE loPkcs11
    RELEASE loCert
    CANCEL
ENDIF

* When finished, close the session.
* It is important to close the session (memory leaks will occur if the session is not properly closed).
lnSuccess = loPkcs11.CloseSession()
IF (lnSuccess = 0) THEN
    ? loPkcs11.LastErrorText
    RELEASE loPkcs11
    RELEASE loCert
    CANCEL
ENDIF

? "Success."

RELEASE loPkcs11
RELEASE loCert