Visual FoxPro

ScMinidriver - Load Certificate from Smart Card or USB Token by Index

See more ScMinidriver Examples

Demonstrates how to load a certificate located on a smart card or USB token by key container index. Visual FoxPro

LOCAL lnSuccess
LOCAL loScmd
LOCAL lcReaderName
LOCAL lnRetval
LOCAL loCert
LOCAL lnKeyContainerIndex
LOCAL lcKeySpec

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

loCert = CreateObject('Chilkat.Cert')
* We can pass a specific key container index, or -1 to locate the 1st non-empty container containing a certificate and private key.
lnKeyContainerIndex = -1
* keySpec can be "kex" or "sig" to indicate the key-exchange or signature position within the container.
* keySpec can also be "any" to accept either position, with preference given to the "sig" position if both are occupied.
lcKeySpec = "any"
lnSuccess = loScmd.GetCert(lnKeyContainerIndex,lcKeySpec,loCert)
IF (lnSuccess = 0) THEN
    ? "Failed to load 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