CkPython

Include the SigningCertificateV2 Authenticated Attribute in CAdES (CMS) Signature

See more CAdES Examples

Demonstrates how to include the SigningCertificateV2 authenticated attribute in a CMS (.p7m/.p7s) signature. CkPython

import sys
import chilkat

success = False

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

crypt = chilkat.CkCrypt2()

cert = chilkat.CkCert()
success = cert.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123")
if (success != True):
    print(cert.lastErrorText())
    sys.exit()

# Tell the crypt component to use this cert.
success = crypt.SetSigningCert(cert)
if (success != True):
    print(crypt.lastErrorText())
    sys.exit()

# The CadesEnabled property applies to all methods that create PKCS7 signatures. 
# To create a CAdES-BES signature, set this property equal to true. 
crypt.put_CadesEnabled(True)

crypt.put_HashAlgorithm("sha256")

# We can sign any type of file, creating a .p7s as output.
# The .p7s contains the signature and also embeds the data of the file that is signed.
inFile = "qa_data/pdf/sample.pdf"
p7sFile = "qa_output/sample.pdf.p7s"

jsonSigningAttrs = chilkat.CkJsonObject()
jsonSigningAttrs.UpdateInt("contentType",1)
jsonSigningAttrs.UpdateInt("signingTime",1)
jsonSigningAttrs.UpdateInt("messageDigest",1)

# This is where we specify for the signingCertificateV2 attribute to be included:
jsonSigningAttrs.UpdateInt("signingCertificateV2",1)

crypt.put_SigningAttributes(jsonSigningAttrs.emit())

# By default, all the certs in the chain of authentication are included in the signature.
# If desired, we can choose to only include the signing certificate:
crypt.put_IncludeCertChain(False)

# Create the CAdES-BES attached signature, which contains the original data.
# Note: Chilkat's function naming is not accurate.  CreateP7M creates a PKCS7 signature where the signed file
# is contained within the signature.  CreateP7S creates a detached PKCS7 signature where the signed file
# is NOT contained within the signature.  We want the data to be contained in the signature, therefore
# we call CreateP7M even though we are naming our output file .p7s.
success = crypt.CreateP7M(inFile,p7sFile)
if (success == False):
    print(crypt.lastErrorText())
    sys.exit()

# Verify the .p7s file and extract the original file from the .p7s. 
extractedToFilePath = "qa_output/sample.pdf"
success = crypt.VerifyP7M(p7sFile,extractedToFilePath)
if (success == False):
    print(crypt.lastErrorText())
    sys.exit()

print("Success!")