Visual Basic 6.0

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

See more ScMinidriver Examples

Demonstrates how to use a certificate + private key located on a smart card for the TLS client certificate in an HTTPS request. Visual Basic 6.0

Dim success As Long
success = 0

' 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 ChilkatPkcs11

' 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 = 0) Then
    Debug.Print pkcs11.LastErrorText
    Exit Sub
End If

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

' Open a session.
Dim readWrite As Long
readWrite = 1
success = pkcs11.OpenSession(slotID,readWrite)
If (success = 0) Then
    Debug.Print 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 Long
userType = 1
Dim pin As String
pin = "0000"
success = pkcs11.Login(userType,pin)
If (success = 0) Then
    Debug.Print pkcs11.LastErrorText
    success = pkcs11.CloseSession()
    Exit Sub
End If

Dim cert As New ChilkatCert

' Find a certificate by the Subject Common Name
success = pkcs11.FindCert("subjectCN","BadSSL Client Certificate",cert)
If (success = 1) Then
    Debug.Print "Found: " & cert.SubjectCN
Else
    Debug.Print "Not found: " & cert.SubjectCN
    success = pkcs11.CloseSession()
    Exit Sub
End If

Debug.Print "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 ChilkatHttp

' Provide the client certificate (linked internally to our authenticated smartcard session)
success = http.SetSslClientCert(cert)
If (success = 0) Then
    Debug.Print http.LastErrorText
    success = pkcs11.CloseSession()
    Exit Sub
End If

Dim responseBody As String
responseBody = http.QuickGetStr("https://client.badssl.com/")
If (http.LastMethodSuccess = 0) Then
    Debug.Print http.LastErrorText
    success = pkcs11.CloseSession()
    Exit Sub
End If

Debug.Print "Response status code: " & http.LastStatus
Debug.Print "Response body: "
Debug.Print responseBody

' ------------------------------------------------------------------------------------------------------------
' Revert to an unauthenticated session by calling Logout.
success = pkcs11.Logout()
If (success = 0) Then
    Debug.Print 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 = 0) Then
    Debug.Print pkcs11.LastErrorText
    Exit Sub
End If

Debug.Print "Success."