Sign a File to Create a .p7m File

Python example to sign a file creating a .p7m file as output. The .p7m contains the signed contents of the original file. It can be verified and restored by calling VerifyP7M.

Download Chilkat Python Library

import sys
import chilkat

crypt = chilkat.CkCrypt2()

#  Any string argument automatically begins the 30-day trial.
success = crypt.UnlockComponent("30-day trial")
if (success != True):
    print "Crypt component unlock failed"
    sys.exit()

#  Find our digital certificate from the Current User certificate store.
ccs = chilkat.CkCreateCS()

certStore = ccs.OpenCurrentUserStore()

cert = certStore.FindCertBySubjectCN("Chilkat Software, Inc.")
if (cert == None ):
    print cert.lastErrorText()

    sys.exit()

#  Tell the crypt component to use this cert.
crypt.SetSigningCert(cert)

#  We can sign any type of file, creating a .p7s as output:
success = crypt.CreateP7M("test.xml","test.p7m")
if (success == False):
    print crypt.lastErrorText()

    sys.exit()

#  Verify and restore the original file:
crypt.SetVerifyCert(cert)

success = crypt.VerifyP7M("test.p7m","testRestored.xml")
if (success == False):
    print crypt.lastErrorText()

    sys.exit()

print "Success!"