Visual FoxPro

Use a Smart Card Certificate + Private Key for SSL/TLS Authentication

See more ScMinidriver Examples

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

Note: This example only works on Windows. ScMinidriver is a Windows-specific smart card and USB token minidriver that enables smart card authentication and cryptographic operations within Windows operating systems.

Visual FoxPro

LOCAL lnSuccess
LOCAL loScmd
LOCAL lcReaderName
LOCAL lnRetval
LOCAL lcCertPart
LOCAL lcPartValue
LOCAL loCert
LOCAL loHttp
LOCAL lcResponseBody

lnSuccess = 0

* This example requires the Chilkat API to have been previously unlocked.
* See Global Unlock Sample for sample code.

loScmd = CreateObject('Chilkat.ScMinidriver')

* Reader names (smart card readers or USB tokens) can be discovered
* via List Readers or Find Smart Cards
lcReaderName = "SCM Microsystems Inc. SCR33x USB Smart Card Reader 0"
lnSuccess = loScmd.AcquireContext(lcReaderName)
IF (lnSuccess = 0) THEN
    ? loScmd.LastErrorText
    RELEASE loScmd
    CANCEL
ENDIF

* If successful, the name of the currently inserted smart card is available:
? "Card name: " + loScmd.CardName

* If desired, perform regular PIN authentication with the smartcard.
* For more details about smart card PIN authentication, see the Smart Card PIN Authentication Example
lnRetval = loScmd.PinAuthenticate("user","000000")
IF (lnRetval <> 0) THEN
    ? "PIN Authentication failed."
ENDIF

* You can find a cerficate using any of the following certificate parts:
* "subjectDN" -- The full distinguished name of the cert.
* "subjectDN_withTags" -- Same as above, but in a format that includes the subject part tags, such as the "CN=" in "CN=something"
* "subjectCN" -- The common name part (CN) of the certificate's subject.
* "serial" -- The certificate serial number.
* "serial:issuerCN" -- The certificate serial number + the issuer's common name, delimited with a colon char.
* These are the same certificate parts that can be retrieved by listing certificates on the smart card (or USB token).
* See List Certificates on Smart Card Example
lcCertPart = "subjectCN"
lcPartValue = "BadSSL Client Certificate"

* If the certificate is found, it is loaded into the cert object.
* Note: We imported this certificate from a .p12/.pfx using this Example to Import a .pfx/.p12 onto a Smart Card
loCert = CreateObject('Chilkat.Cert')
lnSuccess = loScmd.FindCert(lcCertPart,lcPartValue,loCert)
IF (lnSuccess = 0) THEN
    ? "Failed to find the certificate."
    loScmd.DeleteContext()
    RELEASE loScmd
    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 ScMinidriver 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.
* If your application calls PinDeauthenticate or DeleteContext, the cert will no longer be able to sign on the smart card
* because the smart card ScMinidriver session will no longer be authenticated or deleted.

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

* 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.

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
    loScmd.DeleteContext()
    RELEASE loScmd
    RELEASE loCert
    RELEASE loHttp
    CANCEL
ENDIF

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

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

* ------------------------------------------------------------------------------------------------------------
* Cleanup our ScMinidriver session...

* When finished with operations that required authentication, you may if you wish, deauthenticate the session.
lnSuccess = loScmd.PinDeauthenticate("user")
IF (lnSuccess = 0) THEN
    ? loScmd.LastErrorText
ENDIF

* Delete the context when finished with the card.
lnSuccess = loScmd.DeleteContext()
IF (lnSuccess = 0) THEN
    ? loScmd.LastErrorText
ENDIF

RELEASE loScmd
RELEASE loCert
RELEASE loHttp