(Tcl) Create Egypt ITIDA CAdES-BES Signature with Automatic JSON Canonicalization

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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.

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load ./chilkat.dll

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

set crypt [new_CkCrypt2]

CkCrypt2_put_VerboseLogging $crypt 1

set cert [new_CkCert]

CkCert_put_VerboseLogging $cert 1

# Set the smart card PIN, which will be needed for signing.
CkCert_put_SmartCardPin $cert "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..
set success [CkCert_LoadFromSmartcard $cert ""]
if {$success != 1} then {
    puts [CkCert_lastErrorText $cert]
    delete_CkCrypt2 $crypt
    delete_CkCert $cert
    exit
}

# Tell the crypt class to use this cert.
set success [CkCrypt2_SetSigningCert $crypt $cert]
if {$success != 1} then {
    puts [CkCrypt2_lastErrorText $crypt]
    delete_CkCrypt2 $crypt
    delete_CkCert $cert
    exit
}

set cmsOptions [new_CkJsonObject]

# Setting "DigestData" causes OID 1.2.840.113549.1.7.5 (digestData) to be used.
CkJsonObject_UpdateBool $cmsOptions "DigestData" 1
CkJsonObject_UpdateBool $cmsOptions "OmitAlgorithmIdNull" 1

# Indicate that we are passing normal JSON and we want Chilkat do automatically
# do the ITIDA JSON canonicalization:
CkJsonObject_UpdateBool $cmsOptions "CanonicalizeITIDA" 1

CkCrypt2_put_CmsOptions $crypt [CkJsonObject_emit $cmsOptions]

# The CadesEnabled property applies to all methods that create CMS/PKCS7 signatures. 
# To create a CAdES-BES signature, set this property equal to true. 
CkCrypt2_put_CadesEnabled $crypt 1

CkCrypt2_put_HashAlgorithm $crypt "sha256"

set jsonSigningAttrs [new_CkJsonObject]

CkJsonObject_UpdateInt $jsonSigningAttrs "contentType" 1
CkJsonObject_UpdateInt $jsonSigningAttrs "signingTime" 1
CkJsonObject_UpdateInt $jsonSigningAttrs "messageDigest" 1
CkJsonObject_UpdateInt $jsonSigningAttrs "signingCertificateV2" 1
CkCrypt2_put_SigningAttributes $crypt [CkJsonObject_emit $jsonSigningAttrs]

# 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:
CkCrypt2_put_IncludeCertChain $crypt 0

# 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,
#       }
# 

set json [new_CkJsonObject]

set success [CkJsonObject_LoadFile $json "qa_data/itida/sdk.invoicing.eta.gov.eg/files/one-doc.json"]
if {$success == 0} then {
    puts [CkJsonObject_lastErrorText $json]
    delete_CkCrypt2 $crypt
    delete_CkCert $cert
    delete_CkJsonObject $cmsOptions
    delete_CkJsonObject $jsonSigningAttrs
    delete_CkJsonObject $json
    exit
}

CkJsonObject_put_EmitCompact $json 0

# Create the CAdES-BES signature.
CkCrypt2_put_EncodingMode $crypt "base64"

# Make sure we sign the utf-8 byte representation of the JSON string
CkCrypt2_put_Charset $crypt "utf-8"

set sigBase64 [CkCrypt2_signStringENC $crypt [CkJsonObject_emit $json]]
if {[CkCrypt2_get_LastMethodSuccess $crypt] == 0} then {
    puts [CkCrypt2_lastErrorText $crypt]
    delete_CkCrypt2 $crypt
    delete_CkCert $cert
    delete_CkJsonObject $cmsOptions
    delete_CkJsonObject $jsonSigningAttrs
    delete_CkJsonObject $json
    exit
}

puts "Base64 signature:"
puts "$sigBase64"

# Add the signature to the JSON.
CkJsonObject_UpdateString $json "signatures[0].signatureType" "I"
CkJsonObject_UpdateString $json "signatures[0].value" $sigBase64

puts "JSON with signature added:"
puts [CkJsonObject_emit $json]

delete_CkCrypt2 $crypt
delete_CkCert $cert
delete_CkJsonObject $cmsOptions
delete_CkJsonObject $jsonSigningAttrs
delete_CkJsonObject $json