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(C) 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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#include <C_CkCrypt2.h>
#include <C_CkCert.h>
#include <C_CkJsonObject.h>

void ChilkatSample(void)
    {
    HCkCrypt2 crypt;
    HCkCert cert;
    BOOL success;
    HCkJsonObject cmsOptions;
    HCkJsonObject jsonSigningAttrs;
    HCkJsonObject json;
    const char *sigBase64;

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

    crypt = CkCrypt2_Create();
    CkCrypt2_putVerboseLogging(crypt,TRUE);

    cert = CkCert_Create();
    CkCert_putVerboseLogging(cert,TRUE);

    // Set the smart card PIN, which will be needed for signing.
    CkCert_putSmartCardPin(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..
    success = CkCert_LoadFromSmartcard(cert,"");
    if (success != TRUE) {
        printf("%s\n",CkCert_lastErrorText(cert));
        CkCrypt2_Dispose(crypt);
        CkCert_Dispose(cert);
        return;
    }

    // Tell the crypt class to use this cert.
    success = CkCrypt2_SetSigningCert(crypt,cert);
    if (success != TRUE) {
        printf("%s\n",CkCrypt2_lastErrorText(crypt));
        CkCrypt2_Dispose(crypt);
        CkCert_Dispose(cert);
        return;
    }

    cmsOptions = CkJsonObject_Create();
    // Setting "DigestData" causes OID 1.2.840.113549.1.7.5 (digestData) to be used.
    CkJsonObject_UpdateBool(cmsOptions,"DigestData",TRUE);
    CkJsonObject_UpdateBool(cmsOptions,"OmitAlgorithmIdNull",TRUE);

    // Indicate that we are passing normal JSON and we want Chilkat do automatically
    // do the ITIDA JSON canonicalization:
    CkJsonObject_UpdateBool(cmsOptions,"CanonicalizeITIDA",TRUE);

    CkCrypt2_putCmsOptions(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_putCadesEnabled(crypt,TRUE);

    CkCrypt2_putHashAlgorithm(crypt,"sha256");

    jsonSigningAttrs = CkJsonObject_Create();
    CkJsonObject_UpdateInt(jsonSigningAttrs,"contentType",1);
    CkJsonObject_UpdateInt(jsonSigningAttrs,"signingTime",1);
    CkJsonObject_UpdateInt(jsonSigningAttrs,"messageDigest",1);
    CkJsonObject_UpdateInt(jsonSigningAttrs,"signingCertificateV2",1);
    CkCrypt2_putSigningAttributes(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_putIncludeCertChain(crypt,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 = CkJsonObject_Create();
    success = CkJsonObject_LoadFile(json,"qa_data/itida/sdk.invoicing.eta.gov.eg/files/one-doc.json");
    if (success == FALSE) {
        printf("%s\n",CkJsonObject_lastErrorText(json));
        CkCrypt2_Dispose(crypt);
        CkCert_Dispose(cert);
        CkJsonObject_Dispose(cmsOptions);
        CkJsonObject_Dispose(jsonSigningAttrs);
        CkJsonObject_Dispose(json);
        return;
    }

    CkJsonObject_putEmitCompact(json,FALSE);

    // Create the CAdES-BES signature.
    CkCrypt2_putEncodingMode(crypt,"base64");

    // Make sure we sign the utf-8 byte representation of the JSON string
    CkCrypt2_putCharset(crypt,"utf-8");

    sigBase64 = CkCrypt2_signStringENC(crypt,CkJsonObject_emit(json));
    if (CkCrypt2_getLastMethodSuccess(crypt) == FALSE) {
        printf("%s\n",CkCrypt2_lastErrorText(crypt));
        CkCrypt2_Dispose(crypt);
        CkCert_Dispose(cert);
        CkJsonObject_Dispose(cmsOptions);
        CkJsonObject_Dispose(jsonSigningAttrs);
        CkJsonObject_Dispose(json);
        return;
    }

    printf("Base64 signature:\n");
    printf("%s\n",sigBase64);

    // Add the signature to the JSON.
    CkJsonObject_UpdateString(json,"signatures[0].signatureType","I");
    CkJsonObject_UpdateString(json,"signatures[0].value",sigBase64);

    printf("JSON with signature added:\n");
    printf("%s\n",CkJsonObject_emit(json));


    CkCrypt2_Dispose(crypt);
    CkCert_Dispose(cert);
    CkJsonObject_Dispose(cmsOptions);
    CkJsonObject_Dispose(jsonSigningAttrs);
    CkJsonObject_Dispose(json);

    }

 

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