(CkPython) Create Egypt ITIDA CAdES-BES .p7s Signature (with strings in-memory)

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Demonstrates how to create a .p7s signature that fits Egypt's ITIDA requirements.

Note: This example requires Chilkat v9.5.0.75 or greater.

Chilkat Python Downloads install with pip pip3 install chilkat or download... Python Module for Windows, MacOS, Linux, Alpine Linux, Solaris

import sys
import chilkat

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

crypt = chilkat.CkCrypt2()

cert = chilkat.CkCert()

# There are many ways to load the certificate.  
# This example was created for a customer using an ePass2003 USB token.
# Assuming the USB token is the only source of a hardware-based private key..
success = cert.LoadFromSmartcard("")
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()

cmsOptions = chilkat.CkJsonObject()
# Setting "DigestData" causes OID 1.2.840.113549.1.7.5 (digestData) to be used.
cmsOptions.UpdateBool("DigestData",True)
cmsOptions.UpdateBool("OmitAlgorithmIdNull",True)
crypt.put_CmsOptions(cmsOptions.emit())

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

crypt.put_HashAlgorithm("sha256")

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

# Make sure we sign the utf-8 byte representation of the JSON string
crypt.put_Charset("utf-8")

# Create the CAdES-BES signature.
textToSign = "\"issuer\"\"address\"\"branchID\"\"0\"\"country\"\"EG\"\"regionCity..."

crypt.put_EncodingMode("base64")
sigBase64 = crypt.signStringENC(textToSign)
if (crypt.get_LastMethodSuccess() == False):
    print(crypt.lastErrorText())
    sys.exit()

print("Base64 signature:")
print(sigBase64)