Objective-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.

Objective-C

#import <CkoCrypt2.h>
#import <CkoCert.h>
#import <CkoJsonObject.h>
#import <NSString.h>

BOOL success = NO;

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

CkoCrypt2 *crypt = [[CkoCrypt2 alloc] init];
crypt.VerboseLogging = YES;

CkoCert *cert = [[CkoCert alloc] init];
cert.VerboseLogging = YES;

//  Set the smart card PIN, which will be needed for signing.
cert.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 != YES) {
    NSLog(@"%@",cert.LastErrorText);
    return;
}

//  Tell the crypt class to use this cert.
success = [crypt SetSigningCert: cert];
if (success != YES) {
    NSLog(@"%@",crypt.LastErrorText);
    return;
}

CkoJsonObject *cmsOptions = [[CkoJsonObject alloc] init];
//  Setting "DigestData" causes OID 1.2.840.113549.1.7.5 (digestData) to be used.
[cmsOptions UpdateBool: @"DigestData" value: YES];
[cmsOptions UpdateBool: @"OmitAlgorithmIdNull" value: YES];

//  Indicate that we are passing normal JSON and we want Chilkat do automatically
//  do the ITIDA JSON canonicalization:
[cmsOptions UpdateBool: @"CanonicalizeITIDA" value: YES];

crypt.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.CadesEnabled = YES;

crypt.HashAlgorithm = @"sha256";

CkoJsonObject *jsonSigningAttrs = [[CkoJsonObject alloc] init];
[jsonSigningAttrs UpdateInt: @"contentType" value: [NSNumber numberWithInt: 1]];
[jsonSigningAttrs UpdateInt: @"signingTime" value: [NSNumber numberWithInt: 1]];
[jsonSigningAttrs UpdateInt: @"messageDigest" value: [NSNumber numberWithInt: 1]];
[jsonSigningAttrs UpdateInt: @"signingCertificateV2" value: [NSNumber numberWithInt: 1]];
crypt.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.IncludeCertChain = NO;

//  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,
//        }
//  

CkoJsonObject *json = [[CkoJsonObject alloc] init];
success = [json LoadFile: @"qa_data/itida/sdk.invoicing.eta.gov.eg/files/one-doc.json"];
if (success == NO) {
    NSLog(@"%@",json.LastErrorText);
    return;
}

json.EmitCompact = NO;

//  Create the CAdES-BES signature.
crypt.EncodingMode = @"base64";

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

NSString *sigBase64 = [crypt SignStringENC: [json Emit]];
if (crypt.LastMethodSuccess == NO) {
    NSLog(@"%@",crypt.LastErrorText);
    return;
}

NSLog(@"%@",@"Base64 signature:");
NSLog(@"%@",sigBase64);

//  Add the signature to the JSON.
[json UpdateString: @"signatures[0].signatureType" value: @"I"];
[json UpdateString: @"signatures[0].value" value: sigBase64];

NSLog(@"%@",@"JSON with signature added:");
NSLog(@"%@",[json Emit]);