(Visual FoxPro) ScMinidriver - Find and Load Certificate from Smart Card or USB Token

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Demonstrates how to find and load a specific certificate located on a smart card or USB token.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

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

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

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.ScMinidriver')
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 = "PIVKey E42D60A759D39147A26E0AF2FB1183C5"

* If the certificate is found, it is loaded into the cert object.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Cert')
loCert = CreateObject('Chilkat.Cert')
lnSuccess = loScmd.FindCert(lcCertPart,lcPartValue,loCert)
IF (lnSuccess = 0) THEN
    ? "Failed to find the certificate."
ELSE
    ? "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.
ENDIF

* ...
* ...
* ...

* 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