(Lianja) Use Installed Cert on Windows for TLS Client Authentication

Demonstrates how to use a certificate that has already been installed on a Windows PC for TLS client authentication.

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

loHttp = createobject("CkHttp")

//  On Windows, a pre-installed certificate can be loaded in a number of different ways.
//  This example loads by the common name:
loCert = createobject("CkCert")
llSuccess = loCert.LoadByCommonName("My ECA Medium Assurance Identity Certificate")
if (llSuccess <> .T.) then
    ? loCert.LastErrorText
    release loHttp
    release loCert
    return
endif

//  Make sure this certificate has a private key available.
//  It should be a private key such that when the certificate was installed, it was marked as "exportable"
//  so that authorized programs are able to access the private key.
if (loCert.HasPrivateKey() <> .T.) then
    ? "A private key is needed for TLS client authentication."
    ? "This certificate has no private key."
    release loHttp
    release loCert
    return
endif

//  Set the certificate to be used for mutual TLS authentication
//  (i.e. sets the client-side certificate for two-way TLS authentication)
llSuccess = loHttp.SetSslClientCert(loCert)
if (llSuccess <> .T.) then
    ? loHttp.LastErrorText
    release loHttp
    release loCert
    return
endif

//  At this point, the HTTP object instance is setup with the client-side cert, and any SSL/TLS
//  connection will automatically use it if the server demands a client-side cert.


release loHttp
release loCert