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Unicode C

Sign XML for Zakat, Tax and Customs Authority (ZATCA)

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Demonstrates how to sign XML for Zakat, Tax and Customs Authority (ZATCA).

Chilkat Unicode C Downloads

Unicode C
#include <C_CkStringBuilderW.h>
#include <C_CkXmlDSigGenW.h>
#include <C_CkXmlW.h>
#include <C_CkCertW.h>
#include <C_CkPrivateKeyW.h>
#include <C_CkXmlDSigW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkStringBuilderW sbXml;
    HCkXmlDSigGenW gen;
    HCkXmlW object1;
    HCkXmlW xml1;
    HCkCertW certFromPfx;
    HCkCertW cert;
    HCkPrivateKeyW privKey;
    HCkXmlDSigW verifier;
    int numSigs;
    int verifyIdx;
    BOOL verified;

    success = FALSE;

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

    success = TRUE;

    // Load XML to be signed...
    sbXml = CkStringBuilderW_Create();
    success = CkStringBuilderW_LoadFile(sbXml,L"qa_data/xml_dsig_valid_samples/UBL_Saudi_ZATCA_Zakat_Tax_and_Customs_Authority_toBeSigned.xml",L"utf-8");
    if (success == FALSE) {
        wprintf(L"Failed to load XML file to be signed.\n");
        CkStringBuilderW_Dispose(sbXml);
        return;
    }

    // Loads XML containing the following (with data modified from the original sample).

    // <?xml version="1.0" encoding="UTF-8"?>
    // <Invoice xmlns="urn:oasis:names:specification:ubl:schema:xsd:Invoice-2" xmlns:cac="urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2" xmlns:cbc="urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2" xmlns:ext="urn:oasis:names:specification:ubl:schema:xsd:CommonExtensionComponents-2"><ext:UBLExtensions>
    //     <ext:UBLExtension>
    //         <ext:ExtensionURI>urn:oasis:names:specification:ubl:dsig:enveloped:xades</ext:ExtensionURI>
    //         <ext:ExtensionContent>
    //             <sig:UBLDocumentSignatures xmlns:sig="urn:oasis:names:specification:ubl:schema:xsd:CommonSignatureComponents-2" xmlns:sac="urn:oasis:names:specification:ubl:schema:xsd:SignatureAggregateComponents-2" xmlns:sbc="urn:oasis:names:specification:ubl:schema:xsd:SignatureBasicComponents-2">
    //                 <sac:SignatureInformation>
    //                     <cbc:ID>urn:oasis:names:specification:ubl:signature:1</cbc:ID>
    //                     <sbc:ReferencedSignatureID>urn:oasis:names:specification:ubl:signature:Invoice</sbc:ReferencedSignatureID>
    //                     
    //                 </sac:SignatureInformation>
    //             </sig:UBLDocumentSignatures>
    //         </ext:ExtensionContent>
    //     </ext:UBLExtension>
    // </ext:UBLExtensions>
    //    
    //    <cbc:ProfileID>reporting:1.0</cbc:ProfileID>
    //    <cbc:ID>100</cbc:ID>
    //    <cbc:UUID>3cf5ee18-ee25-44ea-a444-2c37ba7f28be</cbc:UUID>
    //    <cbc:IssueDate>2021-04-25</cbc:IssueDate>
    //    <cbc:IssueTime>15:30:00</cbc:IssueTime>
    //    <cbc:InvoiceTypeCode name="0100000">388</cbc:InvoiceTypeCode>
    //    <cbc:DocumentCurrencyCode>SAR</cbc:DocumentCurrencyCode>
    //    <cbc:TaxCurrencyCode>SAR</cbc:TaxCurrencyCode>
    //    <cbc:LineCountNumeric>2</cbc:LineCountNumeric>
    //    <cac:AdditionalDocumentReference>
    //       <cbc:ID>ICV</cbc:ID>
    //       <cbc:UUID>46531</cbc:UUID>
    //    </cac:AdditionalDocumentReference>
    //    <cac:AdditionalDocumentReference>
    //       <cbc:ID>PIH</cbc:ID>
    //       <cac:Attachment>
    //          <cbc:EmbeddedDocumentBinaryObject mimeCode="text/plain">NWZl......NTdlOQ==</cbc:EmbeddedDocumentBinaryObject>
    //       </cac:Attachment>
    //    </cac:AdditionalDocumentReference>
    //    
    //   
    //    <cac:AdditionalDocumentReference>
    //         <cbc:ID>QR</cbc:ID>
    //         <cac:Attachment>
    //             <cbc:EmbeddedDocumentBinaryObject mimeCode="text/plain">ARlBbC........FAau5g</cbc:EmbeddedDocumentBinaryObject>
    //         </cac:Attachment>
    // </cac:AdditionalDocumentReference><cac:Signature>
    //       <cbc:ID>urn:oasis:names:specification:ubl:signature:Invoice</cbc:ID>
    //       <cbc:SignatureMethod>urn:oasis:names:specification:ubl:dsig:enveloped:xades</cbc:SignatureMethod>
    // </cac:Signature><cac:AccountingSupplierParty>
    //       <cac:Party>
    //          <cac:PartyIdentification>
    //             <cbc:ID schemeID="MLS">123457890</cbc:ID>
    //          </cac:PartyIdentification>
    //          <cac:PostalAddress>
    //             <cbc:StreetName>King Abdulaziz Road</cbc:StreetName>
    //             <cbc:BuildingNumber>9999</cbc:BuildingNumber>
    //             <cbc:PlotIdentification>9999</cbc:PlotIdentification>
    //             <cbc:CitySubdivisionName>Al Amal</cbc:CitySubdivisionName>
    //             <cbc:CityName>Riyadh</cbc:CityName>
    //             <cbc:PostalZone>12643</cbc:PostalZone>
    //             <cbc:CountrySubentity>Riyadh Region</cbc:CountrySubentity>
    //             <cac:Country>
    //                <cbc:IdentificationCode>SA</cbc:IdentificationCode>
    //             </cac:Country>
    //          </cac:PostalAddress>
    //          <cac:PartyTaxScheme>
    //             <cbc:CompanyID>300099999900003</cbc:CompanyID>
    //             <cac:TaxScheme>
    //                <cbc:ID>VAT</cbc:ID>
    //             </cac:TaxScheme>
    //          </cac:PartyTaxScheme>
    //          <cac:PartyLegalEntity>
    //             <cbc:RegistrationName>Example Co. LTD</cbc:RegistrationName>
    //          </cac:PartyLegalEntity>
    //       </cac:Party>
    //    </cac:AccountingSupplierParty>
    //    <cac:AccountingCustomerParty>
    //       <cac:Party>
    //          <cac:PartyIdentification>
    //             <cbc:ID schemeID="SAG">123C12345678</cbc:ID>
    //          </cac:PartyIdentification>
    //          <cac:PostalAddress>
    //             <cbc:StreetName>King Abdullah Road</cbc:StreetName>
    //             <cbc:BuildingNumber>9999</cbc:BuildingNumber>
    //             <cbc:PlotIdentification>9999</cbc:PlotIdentification>
    //             <cbc:CitySubdivisionName>Al Mursalat</cbc:CitySubdivisionName>
    //             <cbc:CityName>Riyadh</cbc:CityName>
    //             <cbc:PostalZone>11564</cbc:PostalZone>
    //             <cbc:CountrySubentity>Riyadh Region</cbc:CountrySubentity>
    //             <cac:Country>
    //                <cbc:IdentificationCode>SA</cbc:IdentificationCode>
    //             </cac:Country>
    //          </cac:PostalAddress>
    //          <cac:PartyTaxScheme>
    //             <cac:TaxScheme>
    //                <cbc:ID>VAT</cbc:ID>
    //             </cac:TaxScheme>
    //          </cac:PartyTaxScheme>
    //          <cac:PartyLegalEntity>
    //             <cbc:RegistrationName>EXAMPLE MARKETS</cbc:RegistrationName>
    //          </cac:PartyLegalEntity>
    //       </cac:Party>
    //    </cac:AccountingCustomerParty>
    //    <cac:Delivery>
    //       <cbc:ActualDeliveryDate>2022-04-25</cbc:ActualDeliveryDate>
    //    </cac:Delivery>
    //    <cac:PaymentMeans>
    //       <cbc:PaymentMeansCode>42</cbc:PaymentMeansCode>
    //    </cac:PaymentMeans>
    //    <cac:TaxTotal>
    //       <cbc:TaxAmount currencyID="SAR">135.00</cbc:TaxAmount>
    //       <cac:TaxSubtotal>
    //          <cbc:TaxableAmount currencyID="SAR">900.00</cbc:TaxableAmount>
    //          <cbc:TaxAmount currencyID="SAR">135.00</cbc:TaxAmount>
    //          <cac:TaxCategory>
    //             <cbc:ID>S</cbc:ID>
    //             <cbc:Percent>15</cbc:Percent>
    //             <cac:TaxScheme>
    //                <cbc:ID>VAT</cbc:ID>
    //             </cac:TaxScheme>
    //          </cac:TaxCategory>
    //       </cac:TaxSubtotal>
    //    </cac:TaxTotal>
    //    <cac:TaxTotal>
    //       <cbc:TaxAmount currencyID="SAR">135.00</cbc:TaxAmount>
    //    </cac:TaxTotal>
    //    <cac:LegalMonetaryTotal>
    //       <cbc:LineExtensionAmount currencyID="SAR">900.00</cbc:LineExtensionAmount>
    //       <cbc:TaxExclusiveAmount currencyID="SAR">900.00</cbc:TaxExclusiveAmount>
    //       <cbc:TaxInclusiveAmount currencyID="SAR">1035.00</cbc:TaxInclusiveAmount>
    //       <cbc:AllowanceTotalAmount currencyID="SAR">0.00</cbc:AllowanceTotalAmount>
    //       <cbc:PayableAmount currencyID="SAR">1035.00</cbc:PayableAmount>
    //    </cac:LegalMonetaryTotal>
    //    <cac:InvoiceLine>
    //       <cbc:ID>1</cbc:ID>
    //       <cbc:InvoicedQuantity unitCode="PCE">1</cbc:InvoicedQuantity>
    //       <cbc:LineExtensionAmount currencyID="SAR">200.00</cbc:LineExtensionAmount>
    //       <cac:TaxTotal>
    //          <cbc:TaxAmount currencyID="SAR">30.00</cbc:TaxAmount>
    //          <cbc:RoundingAmount currencyID="SAR">230.00</cbc:RoundingAmount>
    //       </cac:TaxTotal>
    //       <cac:Item>
    //          <cbc:Name>Item A</cbc:Name>
    //          <cac:ClassifiedTaxCategory>
    //             <cbc:ID>S</cbc:ID>
    //             <cbc:Percent>15</cbc:Percent>
    //             <cac:TaxScheme>
    //                <cbc:ID>VAT</cbc:ID>
    //             </cac:TaxScheme>
    //          </cac:ClassifiedTaxCategory>
    //       </cac:Item>
    //       <cac:Price>
    //          <cbc:PriceAmount currencyID="SAR">200.00</cbc:PriceAmount>
    //       </cac:Price>
    //    </cac:InvoiceLine>
    //    <cac:InvoiceLine>
    //       <cbc:ID>2</cbc:ID>
    //       <cbc:InvoicedQuantity unitCode="PCE">2</cbc:InvoicedQuantity>
    //       <cbc:LineExtensionAmount currencyID="SAR">700.00</cbc:LineExtensionAmount>
    //       <cac:TaxTotal>
    //          <cbc:TaxAmount currencyID="SAR">105.00</cbc:TaxAmount>
    //          <cbc:RoundingAmount currencyID="SAR">805.00</cbc:RoundingAmount>
    //       </cac:TaxTotal>
    //       <cac:Item>
    //          <cbc:Name>Item B</cbc:Name>
    //          <cac:ClassifiedTaxCategory>
    //             <cbc:ID>S</cbc:ID>
    //             <cbc:Percent>15</cbc:Percent>
    //             <cac:TaxScheme>
    //                <cbc:ID>VAT</cbc:ID>
    //             </cac:TaxScheme>
    //          </cac:ClassifiedTaxCategory>
    //       </cac:Item>
    //       <cac:Price>
    //          <cbc:PriceAmount currencyID="SAR">350.00</cbc:PriceAmount>
    //       </cac:Price>
    //    </cac:InvoiceLine>
    // </Invoice>

    gen = CkXmlDSigGenW_Create();

    CkXmlDSigGenW_putSigLocation(gen,L"Invoice|ext:UBLExtensions|ext:UBLExtension|ext:ExtensionContent|sig:UBLDocumentSignatures|sac:SignatureInformation");
    CkXmlDSigGenW_putSigLocationMod(gen,0);
    CkXmlDSigGenW_putSigId(gen,L"signature");
    CkXmlDSigGenW_putSigNamespacePrefix(gen,L"ds");
    CkXmlDSigGenW_putSigNamespaceUri(gen,L"http://www.w3.org/2000/09/xmldsig#");
    CkXmlDSigGenW_putSignedInfoCanonAlg(gen,L"C14N_11");
    CkXmlDSigGenW_putSignedInfoDigestMethod(gen,L"sha256");

    // Create an Object to be added to the Signature.
    object1 = CkXmlW_Create();
    CkXmlW_putTag(object1,L"xades:QualifyingProperties");
    CkXmlW_AddAttribute(object1,L"xmlns:xades",L"http://uri.etsi.org/01903/v1.3.2#");
    CkXmlW_AddAttribute(object1,L"Target",L"signature");
    CkXmlW_UpdateAttrAt(object1,L"xades:SignedProperties",TRUE,L"Id",L"xadesSignedProperties");
    CkXmlW_UpdateChildContent(object1,L"xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningTime",L"TO BE GENERATED BY CHILKAT");
    CkXmlW_UpdateAttrAt(object1,L"xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert|xades:CertDigest|ds:DigestMethod",TRUE,L"Algorithm",L"http://www.w3.org/2001/04/xmlenc#sha256");
    CkXmlW_UpdateChildContent(object1,L"xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert|xades:CertDigest|ds:DigestValue",L"TO BE GENERATED BY CHILKAT");
    CkXmlW_UpdateChildContent(object1,L"xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert|xades:IssuerSerial|ds:X509IssuerName",L"TO BE GENERATED BY CHILKAT");
    CkXmlW_UpdateChildContent(object1,L"xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert|xades:IssuerSerial|ds:X509SerialNumber",L"TO BE GENERATED BY CHILKAT");

    CkXmlDSigGenW_AddObject(gen,L"",CkXmlW_getXml(object1),L"",L"");

    // -------- Reference 1 --------
    xml1 = CkXmlW_Create();
    CkXmlW_putTag(xml1,L"ds:Transforms");
    CkXmlW_UpdateAttrAt(xml1,L"ds:Transform",TRUE,L"Algorithm",L"http://www.w3.org/TR/1999/REC-xpath-19991116");
    CkXmlW_UpdateChildContent(xml1,L"ds:Transform|ds:XPath",L"not(//ancestor-or-self::ext:UBLExtensions)");
    CkXmlW_UpdateAttrAt(xml1,L"ds:Transform[1]",TRUE,L"Algorithm",L"http://www.w3.org/TR/1999/REC-xpath-19991116");
    CkXmlW_UpdateChildContent(xml1,L"ds:Transform[1]|ds:XPath",L"not(//ancestor-or-self::cac:Signature)");
    CkXmlW_UpdateAttrAt(xml1,L"ds:Transform[2]",TRUE,L"Algorithm",L"http://www.w3.org/TR/1999/REC-xpath-19991116");
    CkXmlW_UpdateChildContent(xml1,L"ds:Transform[2]|ds:XPath",L"not(//ancestor-or-self::cac:AdditionalDocumentReference[cbc:ID='QR'])");
    CkXmlW_UpdateAttrAt(xml1,L"ds:Transform[3]",TRUE,L"Algorithm",L"http://www.w3.org/2006/12/xml-c14n11");

    CkXmlDSigGenW_AddSameDocRef2(gen,L"",L"sha256",xml1,L"");

    CkXmlDSigGenW_SetRefIdAttr(gen,L"",L"invoiceSignedData");

    // -------- Reference 2 --------
    CkXmlDSigGenW_AddObjectRef(gen,L"xadesSignedProperties",L"sha256",L"",L"",L"http://www.w3.org/2000/09/xmldsig#SignatureProperties");

    // Provide a certificate + private key. (PFX password is test123)
    certFromPfx = CkCertW_Create();
    success = CkCertW_LoadPfxFile(certFromPfx,L"qa_data/pfx/cert_test123.pfx",L"test123");
    if (success != TRUE) {
        wprintf(L"%s\n",CkCertW_lastErrorText(certFromPfx));
        CkStringBuilderW_Dispose(sbXml);
        CkXmlDSigGenW_Dispose(gen);
        CkXmlW_Dispose(object1);
        CkXmlW_Dispose(xml1);
        CkCertW_Dispose(certFromPfx);
        return;
    }

    // Alternatively, if your certificate and private key are in separate PEM files, do this:
    cert = CkCertW_Create();
    success = CkCertW_LoadFromFile(cert,L"qa_data/zatca/cert.pem");
    if (success != TRUE) {
        wprintf(L"%s\n",CkCertW_lastErrorText(cert));
        CkStringBuilderW_Dispose(sbXml);
        CkXmlDSigGenW_Dispose(gen);
        CkXmlW_Dispose(object1);
        CkXmlW_Dispose(xml1);
        CkCertW_Dispose(certFromPfx);
        CkCertW_Dispose(cert);
        return;
    }

    wprintf(L"%s\n",CkCertW_subjectCN(cert));

    // Load the private key.
    privKey = CkPrivateKeyW_Create();
    success = CkPrivateKeyW_LoadPemFile(privKey,L"qa_data/zatca/ec-secp256k1-priv-key.pem");
    if (success != TRUE) {
        wprintf(L"%s\n",CkPrivateKeyW_lastErrorText(privKey));
        CkStringBuilderW_Dispose(sbXml);
        CkXmlDSigGenW_Dispose(gen);
        CkXmlW_Dispose(object1);
        CkXmlW_Dispose(xml1);
        CkCertW_Dispose(certFromPfx);
        CkCertW_Dispose(cert);
        CkPrivateKeyW_Dispose(privKey);
        return;
    }

    wprintf(L"Key Type: %s\n",CkPrivateKeyW_keyType(privKey));

    // Associate the private key with the certificate.
    success = CkCertW_SetPrivateKey(cert,privKey);
    if (success != TRUE) {
        wprintf(L"%s\n",CkCertW_lastErrorText(cert));
        CkStringBuilderW_Dispose(sbXml);
        CkXmlDSigGenW_Dispose(gen);
        CkXmlW_Dispose(object1);
        CkXmlW_Dispose(xml1);
        CkCertW_Dispose(certFromPfx);
        CkCertW_Dispose(cert);
        CkPrivateKeyW_Dispose(privKey);
        return;
    }

    // The certificate passed to SetX509Cert must have an associated private key.
    // If the cert was loaded from a PFX, then it should automatically has an associated private key.
    // If the cert was loaded from PEM, then the private key was explicitly associated as shown above.
    success = CkXmlDSigGenW_SetX509Cert(gen,cert,TRUE);
    if (success != TRUE) {
        wprintf(L"%s\n",CkXmlDSigGenW_lastErrorText(gen));
        CkStringBuilderW_Dispose(sbXml);
        CkXmlDSigGenW_Dispose(gen);
        CkXmlW_Dispose(object1);
        CkXmlW_Dispose(xml1);
        CkCertW_Dispose(certFromPfx);
        CkCertW_Dispose(cert);
        CkPrivateKeyW_Dispose(privKey);
        return;
    }

    CkXmlDSigGenW_putKeyInfoType(gen,L"X509Data");
    CkXmlDSigGenW_putX509Type(gen,L"Certificate");

    // ---------------- This is important -----------------------------------------
    // Starting in Chilkat v9.5.0.92, add the "ZATCA" behavior to produce the format required by ZATCA.
    CkXmlDSigGenW_putBehaviors(gen,L"IndentedSignature,TransformSignatureXPath,ZATCA");
    // ----------------------------------------------------------------------------

    // Sign the XML...
    success = CkXmlDSigGenW_CreateXmlDSigSb(gen,sbXml);
    if (success != TRUE) {
        wprintf(L"%s\n",CkXmlDSigGenW_lastErrorText(gen));
        CkStringBuilderW_Dispose(sbXml);
        CkXmlDSigGenW_Dispose(gen);
        CkXmlW_Dispose(object1);
        CkXmlW_Dispose(xml1);
        CkCertW_Dispose(certFromPfx);
        CkCertW_Dispose(cert);
        CkPrivateKeyW_Dispose(privKey);
        return;
    }

    // -----------------------------------------------

    // Save the signed XML to a file.
    success = CkStringBuilderW_WriteFile(sbXml,L"qa_output/signedXml.xml",L"utf-8",FALSE);

    wprintf(L"%s\n",CkStringBuilderW_getAsString(sbXml));

    // ----------------------------------------
    // Verify the signatures we just produced...
    verifier = CkXmlDSigW_Create();
    success = CkXmlDSigW_LoadSignatureSb(verifier,sbXml);
    if (success != TRUE) {
        wprintf(L"%s\n",CkXmlDSigW_lastErrorText(verifier));
        CkStringBuilderW_Dispose(sbXml);
        CkXmlDSigGenW_Dispose(gen);
        CkXmlW_Dispose(object1);
        CkXmlW_Dispose(xml1);
        CkCertW_Dispose(certFromPfx);
        CkCertW_Dispose(cert);
        CkPrivateKeyW_Dispose(privKey);
        CkXmlDSigW_Dispose(verifier);
        return;
    }

    // ---------------- This is important -----------------------------------------
    // Starting in Chilkat v9.5.0.92, specify "ZATCA" in uncommon options 
    // to validate signed XML according to ZATCA needs.
    // ----------------------------------------------------------------------------
    CkXmlDSigW_putUncommonOptions(verifier,L"ZATCA");

    numSigs = CkXmlDSigW_getNumSignatures(verifier);
    verifyIdx = 0;
    while (verifyIdx < numSigs) {
        CkXmlDSigW_putSelector(verifier,verifyIdx);
        verified = CkXmlDSigW_VerifySignature(verifier,TRUE);
        if (verified != TRUE) {
            wprintf(L"%s\n",CkXmlDSigW_lastErrorText(verifier));
            CkStringBuilderW_Dispose(sbXml);
            CkXmlDSigGenW_Dispose(gen);
            CkXmlW_Dispose(object1);
            CkXmlW_Dispose(xml1);
            CkCertW_Dispose(certFromPfx);
            CkCertW_Dispose(cert);
            CkPrivateKeyW_Dispose(privKey);
            CkXmlDSigW_Dispose(verifier);
            return;
        }

        verifyIdx = verifyIdx + 1;
    }

    wprintf(L"All signatures were successfully verified.\n");


    CkStringBuilderW_Dispose(sbXml);
    CkXmlDSigGenW_Dispose(gen);
    CkXmlW_Dispose(object1);
    CkXmlW_Dispose(xml1);
    CkCertW_Dispose(certFromPfx);
    CkCertW_Dispose(cert);
    CkPrivateKeyW_Dispose(privKey);
    CkXmlDSigW_Dispose(verifier);

    }