Dart
Dart
CADES-BES Signature using ePass2003 Token
See more Egypt ITIDA Examples
Demonstrates using a certificate and private key located on an ePass2003 USB token to create a CADES-BES signature.(Demonstrates how to create a .p7s signature that fits Egypt's ITIDA requirements where Chilkat automatically does the ITIDA JSON canonicalization.)
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import 'package:chilkat/chilkat.dart';
void main() {
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
final scmd = CkScMinidriver();
// Reader names (smart card readers or USB tokens) can be discovered
// via List Readers or Find Smart Cards
final readerName = 'FS USB Token 0';
try {
scmd.acquireContext(readerName);
} on ChilkatException catch (e) {
print(e.lastErrorText);
return;
}
// If successful, the name of the currently inserted smart card is available:
print('Card name: ${scmd.cardName}');
// If desired, perform regular PIN authentication with the smartcard.
// For more details about smart card PIN authentication, see the Smart Card PIN Authentication Example
final retval = scmd.pinAuthenticate('user', '12345678');
if (retval != 0) {
print('PIN Authentication failed.');
}
// You can find a cerficate using any of the following certificate parts:
// "subjectDN" -- The full distinguished name of the cert.
// "subjectDN_withTags" -- Same as above, but in a format that includes the subject part tags, such as the "CN=" in "CN=something"
// "subjectCN" -- The common name part (CN) of the certificate's subject.
// "serial" -- The certificate serial number.
// "serial:issuerCN" -- The certificate serial number + the issuer's common name, delimited with a colon char.
// These are the same certificate parts that can be retrieved by listing certificates on the smart card (or USB token).
// See List Certificates on Smart Card Example
final certPart = 'subjectCN';
final partValue = 'Matt';
// If the certificate is found, it is loaded into the cert object.
// Note: We imported this certificate from a .p12/.pfx using code such as this Example to Import a .pfx/.p12 onto a Smart Card
final cert = CkCert();
try {
scmd.findCert(certPart, partValue, cert);
} on ChilkatException {
print('Failed to find the certificate.');
scmd.deleteContext();
return;
}
print('Successfully loaded the cert object from the smart card / USB token.');
// Note: When successful, the cert object is internally linked to the ScMinidriver object's authenticated session.
// The cert object can now be used to sign or do other cryptographic operations that occur on the smart card / USB token.
// If your application calls PinDeauthenticate or DeleteContext, the cert will no longer be able to sign on the smart card
// because the smart card ScMinidriver session will no longer be authenticated or deleted.
// ------------------------------------------------------------------------------------------------------------
// Here we have to code to create the CADES-BES signature using Chilkat Crypt2..
final crypt = CkCrypt2();
// Tell the crypt class to use the cert on the ePass2003 token.
try {
crypt.setSigningCert(cert);
} on ChilkatException catch (e) {
print(e.lastErrorText);
return;
}
final cmsOptions = 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.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 = true;
crypt.hashAlgorithm = 'sha256';
final jsonSigningAttrs = CkJsonObject();
jsonSigningAttrs.updateInt('contentType', 1);
jsonSigningAttrs.updateInt('signingTime', 1);
jsonSigningAttrs.updateInt('messageDigest', 1);
jsonSigningAttrs.updateInt('signingCertificateV2', 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 = 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,
// }
//
final json = CkJsonObject();
try {
json.loadFile('qa_data/itida/sdk.invoicing.eta.gov.eg/files/one-doc.json');
} on ChilkatException catch (e) {
print(e.lastErrorText);
return;
}
json.emitCompact = false;
// 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';
final String sigBase64;
try {
sigBase64 = crypt.signStringENC(json.emit());
} on ChilkatException catch (e) {
print(e.lastErrorText);
return;
}
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());
// ------------------------------------------------------------------------------------------------------------
// Cleanup our ScMinidriver session...
// When finished with operations that required authentication, you may if you wish, deauthenticate the session.
try {
scmd.pinDeauthenticate('user');
} on ChilkatException catch (e) {
print(e.lastErrorText);
}
// Delete the context when finished with the card.
try {
scmd.deleteContext();
} on ChilkatException catch (e) {
print(e.lastErrorText);
}
}