(Visual FoxPro) (PKCS11) Use a Smart Card Certificate + Private Key for SSL/TLS Authentication

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Demonstrates how to use a certificate + private key located on a smart card for the TLS client certificate in an HTTPS request.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

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

* 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

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

* Find a certificate by the Subject Common Name
lnSuccess = loPkcs11.FindCert("subjectCN","BadSSL Client Certificate",loCert)
IF (lnSuccess = 1) THEN
    ? "Found: " + loCert.SubjectCN
ELSE
    ? "Not found: " + loCert.SubjectCN
    lnSuccess = loPkcs11.CloseSession()
    RELEASE loPkcs11
    RELEASE loCert
    CANCEL
ENDIF

? "Successfully loaded the cert object from the smart card / USB token."

* Note: When successful, the cert object is internally linked to the Pkcs11 object's authenticated session.
* The cert object can now be used to sign or do other cryptographic operations that occur on the smart card / USB token.

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

* Send an HTTPS request to https://client.badssl.com
* https://client.badssl.com (part of the badssl.com service) lets you test authentication using client SSL certificates. 
* The client certificate can be downloaded from https://badssl.com/download/.
* This server returns 200 OK if the correct client certificate is provided, and 400 Bad Request otherwise.

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

* Provide the client certificate (linked internally to our authenticated smartcard session)
lnSuccess = loHttp.SetSslClientCert(loCert)
IF (lnSuccess = 0) THEN
    ? loHttp.LastErrorText
    lnSuccess = loPkcs11.CloseSession()
    RELEASE loPkcs11
    RELEASE loCert
    RELEASE loHttp
    CANCEL
ENDIF

lcResponseBody = loHttp.QuickGetStr("https://client.badssl.com/")
IF (loHttp.LastMethodSuccess = 0) THEN
    ? loHttp.LastErrorText
    lnSuccess = loPkcs11.CloseSession()
    RELEASE loPkcs11
    RELEASE loCert
    RELEASE loHttp
    CANCEL
ENDIF

? "Response status code: " + STR(loHttp.LastStatus)
? "Response body: "
? lcResponseBody

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

? "Success."

RELEASE loPkcs11
RELEASE loCert
RELEASE loHttp