Sign a File to Create a .p7s File (Detached Signature)

Python example to create a detached signature file (.p7s) for any type file. The signature can be verified by calling VerifyP7S and passing the original filename and the .p7s filename.

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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.CreateP7S("license.rtf","license.p7s")
if (success == False):
    print crypt.lastErrorText()

    sys.exit()

#  Verify the signature:
crypt.SetVerifyCert(cert)

success = crypt.VerifyP7S("license.rtf","license.p7s")
if (success == False):
    print crypt.lastErrorText()

    sys.exit()

print "Success!"