(Lianja) 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.

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

loCrypt = createobject("CkCrypt2")
loCrypt.VerboseLogging = .T.

loCert = createobject("CkCert")
loCert.VerboseLogging = .T.

// Set the smart card PIN, which will be needed for signing.
loCert.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..
llSuccess = loCert.LoadFromSmartcard("")
if (llSuccess <> .T.) then
    ? loCert.LastErrorText
    release loCrypt
    release loCert
    return
endif

// Tell the crypt class to use this cert.
llSuccess = loCrypt.SetSigningCert(loCert)
if (llSuccess <> .T.) then
    ? loCrypt.LastErrorText
    release loCrypt
    release loCert
    return
endif

loCmsOptions = createobject("CkJsonObject")
// Setting "DigestData" causes OID 1.2.840.113549.1.7.5 (digestData) to be used.
loCmsOptions.UpdateBool("DigestData",.T.)
loCmsOptions.UpdateBool("OmitAlgorithmIdNull",.T.)

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

loCrypt.CmsOptions = loCmsOptions.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. 
loCrypt.CadesEnabled = .T.

loCrypt.HashAlgorithm = "sha256"

loJsonSigningAttrs = createobject("CkJsonObject")
loJsonSigningAttrs.UpdateInt("contentType",1)
loJsonSigningAttrs.UpdateInt("signingTime",1)
loJsonSigningAttrs.UpdateInt("messageDigest",1)
loJsonSigningAttrs.UpdateInt("signingCertificateV2",1)
loCrypt.SigningAttributes = loJsonSigningAttrs.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:
loCrypt.IncludeCertChain = .F.

// 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,
//       }
// 

loJson = createobject("CkJsonObject")
llSuccess = loJson.LoadFile("qa_data/itida/sdk.invoicing.eta.gov.eg/files/one-doc.json")
if (llSuccess = .F.) then
    ? loJson.LastErrorText
    release loCrypt
    release loCert
    release loCmsOptions
    release loJsonSigningAttrs
    release loJson
    return
endif

loJson.EmitCompact = .F.

// Create the CAdES-BES signature.
loCrypt.EncodingMode = "base64"

// Make sure we sign the utf-8 byte representation of the JSON string
loCrypt.Charset = "utf-8"

lcSigBase64 = loCrypt.SignStringENC(loJson.Emit())
if (loCrypt.LastMethodSuccess = .F.) then
    ? loCrypt.LastErrorText
    release loCrypt
    release loCert
    release loCmsOptions
    release loJsonSigningAttrs
    release loJson
    return
endif

? "Base64 signature:"
? lcSigBase64

// Add the signature to the JSON.
loJson.UpdateString("signatures[0].signatureType","I")
loJson.UpdateString("signatures[0].value",lcSigBase64)

? "JSON with signature added:"
? loJson.Emit()


release loCrypt
release loCert
release loCmsOptions
release loJsonSigningAttrs
release loJson