Xojo Plugin

(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. Xojo Plugin

Dim success As Boolean
success = 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
    System.DebugLog(pkcs11.LastErrorText)
    Return
End If

// Pass -1 for the slotID to open a session on the first non-empty slot.
Dim slotID As Int32
slotID = -1

// Open a session.
Dim readWrite As Boolean
readWrite = True
success = pkcs11.OpenSession(slotID,readWrite)
If (success = False) Then
    System.DebugLog(pkcs11.LastErrorText)
    Return
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 Int32
userType = 1
Dim pin As String
pin = "0000"
success = pkcs11.Login(userType,pin)
If (success = False) Then
    System.DebugLog(pkcs11.LastErrorText)
    success = pkcs11.CloseSession()
    Return
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
    System.DebugLog("Found: " + cert.SubjectCN)
Else
    System.DebugLog("Not found: " + cert.SubjectCN)
    success = pkcs11.CloseSession()
    Return
End If

System.DebugLog("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
    System.DebugLog(http.LastErrorText)
    success = pkcs11.CloseSession()
    Return
End If

Dim responseBody As String
responseBody = http.QuickGetStr("https://client.badssl.com/")
If (http.LastMethodSuccess = False) Then
    System.DebugLog(http.LastErrorText)
    success = pkcs11.CloseSession()
    Return
End If

System.DebugLog("Response status code: " + Str(http.LastStatus))
System.DebugLog("Response body: ")
System.DebugLog(responseBody)

// ------------------------------------------------------------------------------------------------------------
// Revert to an unauthenticated session by calling Logout.
success = pkcs11.Logout()
If (success = False) Then
    System.DebugLog(pkcs11.LastErrorText)
    success = pkcs11.CloseSession()
    Return
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
    System.DebugLog(pkcs11.LastErrorText)
    Return
End If

System.DebugLog("Success.")