Create S/MIME Detached Signature with PFX

How to use a PFX to create a signed S/MIME message.

Download Chilkat Python Library

import sys
import chilkat


mime = chilkat.CkMime()

success = mime.UnlockComponent("Anything for 30-day trial")
if (success == False):
    print "Failed to unlock component"
    sys.exit()

mime.AddHeaderField("Subject","This is a test")
mime.AddHeaderField("Abc","123")

mime.SetBodyFromPlainText("This is the body")

certStore = chilkat.CkCertStore()

password = "myPassword"
success = certStore.LoadPfxFile("chilkat.pfx",password)
if (success == False):
    print certStore.lastErrorText()
    sys.exit()

cert = certStore.FindCertBySubjectCN("Chilkat Software, Inc.")
if (cert == None ):
    print "Failed to find certificate!"
    sys.exit()

#  Display the full distinguished name of the cert.
print cert.subjectDN()

success = mime.AddDetachedSignature(cert)
if (success == False):
    print mime.lastErrorText()
    sys.exit()

print mime.getMime()