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(Visual Basic 6.0) ScMinidriver - Load Certificate from Smart Card or USB Token by Index
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Demonstrates how to load a certificate located on a smart card or USB token by key container index.
' This example requires the Chilkat API to have been previously unlocked. ' See Global Unlock Sample for sample code. Dim scmd As New ChilkatScMinidriver ' Reader names (smart card readers or USB tokens) can be discovered ' via List Readers or Find Smart Cards Dim readerName As String readerName = "SCM Microsystems Inc. SCR33x USB Smart Card Reader 0" Dim success As Long success = scmd.AcquireContext(readerName) If (success = 0) Then Debug.Print scmd.LastErrorText Exit Sub End If ' If successful, the name of the currently inserted smart card is available: Debug.Print "Card name: " & scmd.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 Dim retval As Long retval = scmd.PinAuthenticate("user","000000") If (retval <> 0) Then Debug.Print "PIN Authentication failed." End If Dim cert As New ChilkatCert ' We can pass a specific key container index, or -1 to locate the 1st non-empty container containing a certificate and private key. Dim keyContainerIndex As Long keyContainerIndex = -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. Dim keySpec As String keySpec = "any" success = scmd.GetCert(keyContainerIndex,keySpec,cert) If (success = 0) Then Debug.Print "Failed to load the certificate." Else Debug.Print "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. End If ' ... ' ... ' ... ' When finished with operations that required authentication, you may if you wish, deauthenticate the session. success = scmd.PinDeauthenticate("user") If (success = 0) Then Debug.Print scmd.LastErrorText End If ' Delete the context when finished with the card. success = scmd.DeleteContext() If (success = 0) Then Debug.Print scmd.LastErrorText End If
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