VB.NET

(PKCS11) Use a Smart Card Certificate + Private Key for SSL/TLS Authentication

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

Dim success As Boolean = False

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

' Note: Chilkat's PKCS11 implementation runs on Windows, Linux, Mac OS X, and other supported operating systems.

Dim pkcs11 As New Chilkat.Pkcs11

' Set your shared lib path -- either a full path to the DLL, .so, or .dylib,
' or just the filename if the driver is in a location that can be automatically found. (Such as in C:\Windows\System32)
pkcs11.SharedLibPath = "C:/Program Files (x86)/Gemalto/IDGo 800 PKCS#11/IDPrimePKCS1164.dll"

success = pkcs11.Initialize()
If (success = False) Then
    Debug.WriteLine(pkcs11.LastErrorText)
    Exit Sub
End If


' Pass -1 for the slotID to open a session on the first non-empty slot.
Dim slotID As Integer = -1

' Open a session.
Dim readWrite As Boolean = True
success = pkcs11.OpenSession(slotID,readWrite)
If (success = False) Then
    Debug.WriteLine(pkcs11.LastErrorText)
    Exit Sub
End If


' Make it an authenticated session by calling Login.
' 
' If we don't authenticate, then we won't be able to see the private keys, and thus
' we won't know which certificates have an associated private key stored on the smart card.

' The smart card PIN is passed to the Login method.
' userType 1 indicates a "Normal User".
Dim userType As Integer = 1
Dim pin As String = "0000"
success = pkcs11.Login(userType,pin)
If (success = False) Then
    Debug.WriteLine(pkcs11.LastErrorText)
    success = pkcs11.CloseSession()
    Exit Sub
End If


Dim cert As New Chilkat.Cert

' Find a certificate by the Subject Common Name
success = pkcs11.FindCert("subjectCN","BadSSL Client Certificate",cert)
If (success = True) Then
    Debug.WriteLine("Found: " & cert.SubjectCN)
Else
    Debug.WriteLine("Not found: " & cert.SubjectCN)
    success = pkcs11.CloseSession()
    Exit Sub
End If


Debug.WriteLine("Successfully loaded the cert object from the smart card / USB token.")

' Note: When successful, the cert object is internally linked to the Pkcs11 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.

' ------------------------------------------------------------------------------------------------------------

' 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.

Dim http As New Chilkat.Http

' Provide the client certificate (linked internally to our authenticated smartcard session)
success = http.SetSslClientCert(cert)
If (success = False) Then
    Debug.WriteLine(http.LastErrorText)
    success = pkcs11.CloseSession()
    Exit Sub
End If


Dim responseBody As String = http.QuickGetStr("https://client.badssl.com/")
If (http.LastMethodSuccess = False) Then
    Debug.WriteLine(http.LastErrorText)
    success = pkcs11.CloseSession()
    Exit Sub
End If


Debug.WriteLine("Response status code: " & http.LastStatus)
Debug.WriteLine("Response body: ")
Debug.WriteLine(responseBody)

' ------------------------------------------------------------------------------------------------------------
' Revert to an unauthenticated session by calling Logout.
success = pkcs11.Logout()
If (success = False) Then
    Debug.WriteLine(pkcs11.LastErrorText)
    success = pkcs11.CloseSession()
    Exit Sub
End If


' When finished, close the session.
' It is important to close the session (memory leaks will occur if the session is not properly closed).
success = pkcs11.CloseSession()
If (success = False) Then
    Debug.WriteLine(pkcs11.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("Success.")