(Visual FoxPro) PKCS11 Find All Certificates on Smart Card or USB Token

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Sample code showing how to examine all the certificates 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 lnNumCerts
LOCAL lcPrivateKeyNote
LOCAL loCert
LOCAL i

* 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 = "aetpkss1.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

* Call FindAllCerts to find all certificates on the smart card or USB token.
lnSuccess = loPkcs11.FindAllCerts()
IF (lnSuccess = 0) THEN
    ? loPkcs11.LastErrorText
    lnSuccess = loPkcs11.CloseSession()
    RELEASE loPkcs11
    CANCEL
ENDIF

* The NumCerts property is set by FindAllCerts.
lnNumCerts = loPkcs11.NumCerts
? "Number of certs: " + STR(lnNumCerts)

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Cert')
loCert = CreateObject('Chilkat.Cert')
i = 0
DO WHILE i < lnNumCerts
    loPkcs11.GetCert(i,loCert)
    lcPrivateKeyNote = ""
    IF (loCert.HasPrivateKey() = 1) THEN
        lcPrivateKeyNote = "(has private key)"
    ENDIF

    ? STR(i) + ": " + lcPrivateKeyNote + " " + loCert.SubjectDN
    ? STR(i) + ": issuer: " + loCert.IssuerDN
    ? "----"
    i = i + 1
ENDDO

* 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