(Python) 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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import sys
import chilkat

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

http = chilkat.CkHttp()

#  On Windows, a pre-installed certificate can be loaded in a number of different ways.
#  This example loads by the common name:
cert = chilkat.CkCert()
success = cert.LoadByCommonName("My ECA Medium Assurance Identity Certificate")
if (success != True):
    print(cert.lastErrorText())
    sys.exit()

#  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 (cert.HasPrivateKey() != True):
    print("A private key is needed for TLS client authentication.")
    print("This certificate has no private key.")
    sys.exit()

#  Set the certificate to be used for mutual TLS authentication
#  (i.e. sets the client-side certificate for two-way TLS authentication)
success = http.SetSslClientCert(cert)
if (success != True):
    print(http.lastErrorText())
    sys.exit()

#  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.