(CkPython) Download and Trust the DigiCert Global Root CA

Demonstrates how to download a root certificate and trust it.

For more information, see https://www.digicert.com/digicert-root-certificates.htm

Chilkat Python Downloads install with pip pip3 install chilkat or download... Python Module for Windows, MacOS, Linux, Alpine Linux, Solaris

import sys
import chilkat

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

# In this example, the URLs for the DigiCert root CA certs are available at this web page:
# https://www.digicert.com/digicert-root-certificates.htm

# This example downloads the "DigiCert Global Root G3"
# Valid until: 15/Jan/2038
# Serial #: 05:55:56:BC:F2:5E:A4:35:35:C3:A4:0F:D5:AB:45:72
# Thumbprint: 7E04DE896A3E666D00E687D33FFAD93BE83D349E

certUrl = "https://dl.cacerts.digicert.com/DigiCertGlobalRootG3.crt"

http = chilkat.CkHttp()
bdCert = chilkat.CkBinData()
success = http.DownloadBd(certUrl,bdCert)
if (success == False):
    print(http.lastErrorText())
    sys.exit()

# Load it into a Chilkat cert object.
cert = chilkat.CkCert()
success = cert.LoadFromBd(bdCert)
if (success == False):
    print(cert.lastErrorText())
    sys.exit()

# Examine the common name,serial, and thumbprint:
print("CN: " + cert.subjectCN())
print("Serial: " + cert.serialNumber())
print("Thumbprint: " + cert.sha1Thumbprint())

# Output from the above:
# CN: DigiCert Global Root G3
# Serial: 055556BCF25EA43535C3A40FD5AB4572
# Thumbprint: 7E04DE896A3E666D00E687D33FFAD93BE83D349E

# If desired, the certificate can be saved to a local file so it does not need
# to be downloaded from the website every time.  
certPath = "qa_data/certs/DigiCertGlobalRootG3.crt"
success = bdCert.WriteFile(certPath)

# To load the cert from a file...
success = cert.LoadFromFile(certPath)

# Do the following to add the cert to the collection of trusted roots
# for this application.  (Note:  The trust is not persisted.  Each time the
# application runs, it should load the cert (from whatever source, whether it is
# a file, a database,etc.) and do the following:
troots = chilkat.CkTrustedRoots()

troots.AddCert(cert)
troots.Activate()

print(cert.subjectCN() + " is now trusted for this run of this application.")