(Xojo Plugin) ScMinidriver - Find and Load Certificate from Smart Card or USB Token

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

Dim scmd As New Chilkat.ScMinidriver

// 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 Boolean
success = scmd.AcquireContext(readerName)
If (success = False) Then
    System.DebugLog(scmd.LastErrorText)
    Return
End If

// If successful, the name of the currently inserted smart card is available:
System.DebugLog("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 Int32
retval = scmd.PinAuthenticate("user","000000")
If (retval <> 0) Then
    System.DebugLog("PIN Authentication failed.")
End If

// 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
Dim certPart As String
certPart = "subjectCN"
Dim partValue As String
partValue = "PIVKey E42D60A759D39147A26E0AF2FB1183C5"

// If the certificate is found, it is loaded into the cert object.
Dim cert As New Chilkat.Cert
success = scmd.FindCert(certPart,partValue,cert)
If (success = False) Then
    System.DebugLog("Failed to find the certificate.")
Else
    System.DebugLog("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 = False) Then
    System.DebugLog(scmd.LastErrorText)
End If

// Delete the context when finished with the card.
success = scmd.DeleteContext()
If (success = False) Then
    System.DebugLog(scmd.LastErrorText)
End If