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

CkPython 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

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

crypt = chilkat.CkCrypt2()

# Use a digital certificate and private key from a PFX file (.pfx or .p12).
signingCertSubject = "Acme Inc"
pfxFilename = "/Users/chilkat/testData/pfx/acme.pfx"
pfxPassword = "test123"

certStore = chilkat.CkCertStore()
success = certStore.LoadPfxFile(pfxFilename,pfxPassword)
if (success != True):
    print(certStore.lastErrorText())
    sys.exit()

# cert is a CkCert
cert = certStore.FindCertBySubjectCN(signingCertSubject)
if (certStore.get_LastMethodSuccess() == False):
    print("Failed to find certificate by subject common name.")
    sys.exit()

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

# We can sign any type of file, creating a .p7s as output:
inFile = "/Users/chilkat/testData/pdf/sample.pdf"
sigFile = "/Users/chilkat/testData/p7s/sample.p7s"

success = crypt.CreateP7S(inFile,sigFile)
if (success == False):
    print(crypt.lastErrorText())

    sys.exit()

success = crypt.VerifyP7S(inFile,sigFile)
if (success == False):
    print(crypt.lastErrorText())

    sys.exit()

print("Success!")