Go

(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. Go

    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.

    pkcs11 := chilkat.NewPkcs11()

    // 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.SetSharedLibPath("C:/Program Files (x86)/Gemalto/IDGo 800 PKCS#11/IDPrimePKCS1164.dll")

    success = pkcs11.Initialize()
    if success == false {
        fmt.Println(pkcs11.LastErrorText())
        pkcs11.DisposePkcs11()
        return
    }

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

    // Open a session.
    readWrite := true
    success = pkcs11.OpenSession(slotID,readWrite)
    if success == false {
        fmt.Println(pkcs11.LastErrorText())
        pkcs11.DisposePkcs11()
        return
    }

    // 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".
    userType := 1
    pin := "0000"
    success = pkcs11.Login(userType,pin)
    if success == false {
        fmt.Println(pkcs11.LastErrorText())
        success = pkcs11.CloseSession()
        pkcs11.DisposePkcs11()
        return
    }

    cert := chilkat.NewCert()

    // Find a certificate by the Subject Common Name
    success = pkcs11.FindCert("subjectCN","BadSSL Client Certificate",cert)
    if success == true {
        fmt.Println("Found: ", cert.SubjectCN())
    } else {
        fmt.Println("Not found: ", cert.SubjectCN())
        success = pkcs11.CloseSession()
        pkcs11.DisposePkcs11()
        cert.DisposeCert()
        return
    }

    fmt.Println("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.

    http := chilkat.NewHttp()

    // Provide the client certificate (linked internally to our authenticated smartcard session)
    success = http.SetSslClientCert(cert)
    if success == false {
        fmt.Println(http.LastErrorText())
        success = pkcs11.CloseSession()
        pkcs11.DisposePkcs11()
        cert.DisposeCert()
        http.DisposeHttp()
        return
    }

    responseBody := http.QuickGetStr("https://client.badssl.com/")
    if http.LastMethodSuccess() == false {
        fmt.Println(http.LastErrorText())
        success = pkcs11.CloseSession()
        pkcs11.DisposePkcs11()
        cert.DisposeCert()
        http.DisposeHttp()
        return
    }

    fmt.Println("Response status code: ", http.LastStatus())
    fmt.Println("Response body: ")
    fmt.Println(*responseBody)

    // ------------------------------------------------------------------------------------------------------------
    // Revert to an unauthenticated session by calling Logout.
    success = pkcs11.Logout()
    if success == false {
        fmt.Println(pkcs11.LastErrorText())
        success = pkcs11.CloseSession()
        pkcs11.DisposePkcs11()
        cert.DisposeCert()
        http.DisposeHttp()
        return
    }

    // 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 {
        fmt.Println(pkcs11.LastErrorText())
        pkcs11.DisposePkcs11()
        cert.DisposeCert()
        http.DisposeHttp()
        return
    }

    fmt.Println("Success.")

    pkcs11.DisposePkcs11()
    cert.DisposeCert()
    http.DisposeHttp()