CkPython

Create Egypt ITIDA CAdES-BES Signature with Automatic JSON Canonicalization

See more Egypt ITIDA Examples

Demonstrates how to create a .p7s signature that fits Egypt's ITIDA requirements where Chilkat automatically does the ITIDA JSON canonicalization.

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

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()
crypt.put_VerboseLogging(True)

cert = chilkat.CkCert()
cert.put_VerboseLogging(True)

# Set the smart card PIN, which will be needed for signing.
cert.put_SmartCardPin("12345678")

# 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 class 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)

# Indicate that we are passing normal JSON and we want Chilkat do automatically
# do the ITIDA JSON canonicalization:
cmsOptions.UpdateBool("CanonicalizeITIDA",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)

# Pass a JSON document such as the following.  Chilkat will do the ITIDA canonicalization.
# (It is the canonicalized JSON that gets signed.)

#       {
#          "issuer":{
#             "address":{
#                "branchID":"0",
#                "country":"EG",
#                "regionCity":"Cairo",
#                "postalCode":"",
#                "buildingNumber":"0",
#                "street":"123rd Street",
#                "governate":"GOVERNATE"
#             },
#             "type":"B",
#             "id":"209999899",
#             "name":"Xyz SAE"
#          },
#          "receiver":{
#             "address":{
#                "country":"EG",
#                "regionCity":"CAIRO",
#                "postalCode":"11435",
#                "buildingNumber":"0",
#                "street":"Autostrad Road Abc",
#                "governate":"GOVERNATE"
#             },
#             "type":"B",
#             "id":"999999999",
#             "name":"XYZ EGYPT FOR TRADE"
#          },
#          "documentType":"I",
#          "documentTypeVersion":"1.0",
#          "dateTimeIssued":"2020-11-15T11:04:53Z",
#          "taxpayerActivityCode":"1073",
#          "internalID":"ZZZZ999",
#          "purchaseOrderReference":"2009199918",
#          "salesOrderReference":"",
#          "payment":{
#             "bankName":"",
#             "bankAddress":"",
#             "bankAccountNo":"",
#             "bankAccountIBAN":"",
#             "swiftCode":"",
#             "terms":""
#          },
#          "delivery":{
#             "approach":"",
#             "packaging":"",
#             "dateValidity":"",
#             "exportPort":"",
#             "countryOfOrigin":"EG",
#             "grossWeight":0,
#             "netWeight":0,
#             "terms":""
#          },
#          "invoiceLines":[
#             {
#                "description":"CDM Widget 48GX99X12BA",
#                "itemType":"GS1",
#                "itemCode":"7622213335056",
#                "unitType":"CS",
#                "quantity":1.00,
#                "unitValue":{
#                   "currencySold":"EGP",
#                   "amountEGP":588.67,
#                   "amountSold":0,
#                   "currencyExchangeRate":0
#                },
#                "salesTotal":588.67,
#                "total":603.97,
#                "valueDifference":0,
#                "totalTaxableFees":0,
#                "netTotal":529.8,
#                "itemsDiscount":0,
#                "discount":{
#                   "rate":10.00,
#                   "amount":58.87
#                },
#                "taxableItems":[
#                   {
#                      "taxType":"T1",
#                      "amount":74.17,
#                      "subType":"No sub",
#                      "rate":14.00
#                   }
#                ],
#                "internalCode":"9099994"
#             }
#          ],
#          "totalSales":588.67,
#          "totalSalesAmount":588.67,
#          "totalDiscountAmount":58.87,
#          "netAmount":529.80,
#          "taxTotals":[
#             {
#                "taxType":"T1",
#                "amount":74.17
#             }
#          ],
#          "extraDiscountAmount":0,
#          "totalItemsDiscountAmount":0,
#          "totalAmount":603.97,
#       }
# 

json = chilkat.CkJsonObject()
success = json.LoadFile("qa_data/itida/sdk.invoicing.eta.gov.eg/files/one-doc.json")
if (success == False):
    print(json.lastErrorText())
    sys.exit()

json.put_EmitCompact(False)

# Create the CAdES-BES signature.
crypt.put_EncodingMode("base64")

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

sigBase64 = crypt.signStringENC(json.emit())
if (crypt.get_LastMethodSuccess() == False):
    print(crypt.lastErrorText())
    sys.exit()

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

# Add the signature to the JSON.
json.UpdateString("signatures[0].signatureType","I")
json.UpdateString("signatures[0].value",sigBase64)

print("JSON with signature added:")
print(json.emit())