Unicode C++
Paraguay E-Invoicing Signed XML (SIFEN)

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Demonstrates how to sign XML for e-invoicing -- SISTEMA INTEGRADO DE FACTURACIÓN ELECTRÓNICA NACIONAL (SIFEN). This is for signing XML files that need to be submitted to a government agency (Country Paraguay, SIFEN / EKUATIA, Sistema Nacional de Facturacion Electrónica).
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Unicode C++
#include <CkXmlW.h>
#include <CkXmlDSigGenW.h>
#include <CkCertW.h>
#include <CkStringBuilderW.h>
#include <CkXmlDSigW.h>

void ChilkatSample(void)
    {
    bool success = false;

    success = true;

    // Create the XML to be signed...

    // Use this online tool to generate code from sample XML: 
    // Generate Code to Create XML

    CkXmlW xmlToSign;
    xmlToSign.put_Tag(L"rDE");
    xmlToSign.AddAttribute(L"xmlns",L"http://ekuatia.set.gov.py/sifen/xsd");
    xmlToSign.AddAttribute(L"xmlns:xsi",L"http://www.w3.org/2001/XMLSchema-instance");
    xmlToSign.AddAttribute(L"xsi:schemaLocation",L"http://ekuatia.set.gov.py/sifen/xsd siRecepDE_v150.xsd");
    xmlToSign.UpdateChildContent(L"dVerFor",L"150");
    xmlToSign.UpdateAttrAt(L"DE",true,L"Id",L"01800228774059001001501012022091519999999990");
    xmlToSign.UpdateChildContent(L"DE|dDVId",L"0");
    xmlToSign.UpdateChildContent(L"DE|dFecFirma",L"2022-09-15T10:23:05");
    xmlToSign.UpdateChildContent(L"DE|dSisFact",L"1");
    xmlToSign.UpdateChildContent(L"DE|gOpeDE|iTipEmi",L"1");
    xmlToSign.UpdateChildContent(L"DE|gOpeDE|dDesTipEmi",L"Normal");
    xmlToSign.UpdateChildContent(L"DE|gOpeDE|dCodSeg",L"999999999");
    xmlToSign.UpdateChildContent(L"DE|gOpeDE|dInfoEmi",L"GENERADA DE PEDIDO 131043202");
    xmlToSign.UpdateChildContent(L"DE|gTimb|iTiDE",L"1");
    xmlToSign.UpdateChildContent(L"DE|gTimb|dDesTiDE",L"Factura electr�nica");
    xmlToSign.UpdateChildContent(L"DE|gTimb|dNumTim",L"18889014");
    xmlToSign.UpdateChildContent(L"DE|gTimb|dEst",L"059");
    xmlToSign.UpdateChildContent(L"DE|gTimb|dPunExp",L"001");
    xmlToSign.UpdateChildContent(L"DE|gTimb|dNumDoc",L"0015010");
    xmlToSign.UpdateChildContent(L"DE|gTimb|dFeIniT",L"2022-05-25");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|dFeEmiDE",L"2022-09-15T10:22:57");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gOpeCom|iTipTra",L"1");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gOpeCom|dDesTipTra",L"Venta de mercader�a");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gOpeCom|iTImp",L"1");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gOpeCom|dDesTImp",L"IVA");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gOpeCom|cMoneOpe",L"PYG");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gOpeCom|dDesMoneOpe",L"Guarani");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gEmis|dRucEm",L"80022877");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gEmis|dDVEmi",L"4");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gEmis|iTipCont",L"1");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gEmis|cTipReg",L"1");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gEmis|dNomEmi",L"ABCDEF SA");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gEmis|dNomFanEmi",L"ABCDEF SA");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gEmis|dDirEmi",L"Jos� Abcde Xyz N� 666 e/Abxyz123");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gEmis|dNumCas",L"0");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gEmis|dCompDir1",L"N/A");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gEmis|dCompDir2",L"N/A");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gEmis|cDepEmi",L"12");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gEmis|dDesDepEmi",L"CENTRAL");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gEmis|cDisEmi",L"153");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gEmis|dDesDisEmi",L"CAPIATA");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gEmis|cCiuEmi",L"1234");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gEmis|dDesCiuEmi",L"CAPIATA");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gEmis|dTelEmi",L"(022) 1111 000");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gEmis|dEmailE",L"somebody@example.com.py");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gEmis|dDenSuc",L"PUNTO 99");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gEmis|gActEco|cActEco",L"47721");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gEmis|gActEco|dDesActEco",L"COMERCIO AL POR MENOR DE PRODUCTOS");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gDatRec|iNatRec",L"1");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gDatRec|iTiOpe",L"2");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gDatRec|cPaisRec",L"PRY");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gDatRec|dDesPaisRe",L"Paraguay");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gDatRec|iTiContRec",L"2");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gDatRec|dRucRec",L"80082971");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gDatRec|dDVRec",L"9");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gDatRec|dNomRec",L"XXXXXXX");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gDatRec|dNomFanRec",L"XXXXXXX");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gDatRec|dNumCasRec",L"0");
    xmlToSign.UpdateChildContent(L"DE|gDatGralOpe|gDatRec|dCodCliente",L"9999999");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamFE|iIndPres",L"1");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamFE|dDesIndPres",L"Operaci�n presencial");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamCond|iCondOpe",L"1");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamCond|dDCondOpe",L"Contado");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamCond|gPaConEIni|iTiPago",L"1");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamCond|gPaConEIni|dDesTiPag",L"Efectivo");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamCond|gPaConEIni|dMonTiPag",L"100000.0000");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamCond|gPaConEIni|cMoneTiPag",L"PYG");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamCond|gPaConEIni|dDMoneTiPag",L"Guarani");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamCond|gPaConEIni[1]|iTiPago",L"1");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamCond|gPaConEIni[1]|dDesTiPag",L"Efectivo");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamCond|gPaConEIni[1]|dMonTiPag",L"73600.0000");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamCond|gPaConEIni[1]|cMoneTiPag",L"PYG");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamCond|gPaConEIni[1]|dDMoneTiPag",L"Guarani");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamItem|dCodInt",L"818181");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamItem|dDesProSer",L"Widget Abc Xyz");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamItem|cUniMed",L"77");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamItem|dDesUniMed",L"UNI");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamItem|dCantProSer",L"2.0000");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamItem|gValorItem|dPUniProSer",L"16500.0000");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamItem|gValorItem|dTotBruOpeItem",L"33000.0000");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamItem|gValorItem|gValorRestaItem|dDescItem",L"3300.0000");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamItem|gValorItem|gValorRestaItem|dPorcDesIt",L"20.0000");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamItem|gValorItem|gValorRestaItem|dTotOpeItem",L"26400.0000");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamItem|gCamIVA|iAfecIVA",L"1");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamItem|gCamIVA|dDesAfecIVA",L"Gravado IVA");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamItem|gCamIVA|dPropIVA",L"100");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamItem|gCamIVA|dTasaIVA",L"5");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamItem|gCamIVA|dBasGravIVA",L"25142.8571");
    xmlToSign.UpdateChildContent(L"DE|gDtipDE|gCamItem|gCamIVA|dLiqIVAItem",L"1257.1429");
    xmlToSign.UpdateChildContent(L"DE|gTotSub|dSubExe",L"0.0000");
    xmlToSign.UpdateChildContent(L"DE|gTotSub|dSub5",L"26400.0000");
    xmlToSign.UpdateChildContent(L"DE|gTotSub|dSub10",L"0.0000");
    xmlToSign.UpdateChildContent(L"DE|gTotSub|dTotOpe",L"26400.0000");
    xmlToSign.UpdateChildContent(L"DE|gTotSub|dTotDesc",L"6600.0000");
    xmlToSign.UpdateChildContent(L"DE|gTotSub|dTotDescGlotem",L"0.0000");
    xmlToSign.UpdateChildContent(L"DE|gTotSub|dTotAntItem",L"0.0000");
    xmlToSign.UpdateChildContent(L"DE|gTotSub|dTotAnt",L"0.0000");
    xmlToSign.UpdateChildContent(L"DE|gTotSub|dPorcDescTotal",L"0.0000");
    xmlToSign.UpdateChildContent(L"DE|gTotSub|dDescTotal",L"6600.0000");
    xmlToSign.UpdateChildContent(L"DE|gTotSub|dAnticipo",L"0.0000");
    xmlToSign.UpdateChildContent(L"DE|gTotSub|dRedon",L"0.0000");
    xmlToSign.UpdateChildContent(L"DE|gTotSub|dTotGralOpe",L"26400.0000");
    xmlToSign.UpdateChildContent(L"DE|gTotSub|dIVA5",L"1257.1429");
    xmlToSign.UpdateChildContent(L"DE|gTotSub|dIVA10",L"0.0000");
    xmlToSign.UpdateChildContent(L"DE|gTotSub|dTotIVA",L"1257.1429");
    xmlToSign.UpdateChildContent(L"DE|gTotSub|dBaseGrav5",L"25142.8571");
    xmlToSign.UpdateChildContent(L"DE|gTotSub|dBaseGrav10",L"0.0000");
    xmlToSign.UpdateChildContent(L"DE|gTotSub|dTBasGraIVA",L"25142.8571");

    CkXmlDSigGenW gen;

    gen.put_SigLocation(L"rDE");
    gen.put_SigLocationMod(0);
    gen.put_SigNamespacePrefix(L"");
    gen.put_SigNamespaceUri(L"http://www.w3.org/2000/09/xmldsig#");
    gen.put_SignedInfoCanonAlg(L"C14N");
    gen.put_SignedInfoDigestMethod(L"sha256");

    // -------- Reference 1 --------
    CkXmlW xml1;
    xml1.put_Tag(L"Transforms");
    xml1.UpdateAttrAt(L"Transform",true,L"Algorithm",L"http://www.w3.org/2000/09/xmldsig#enveloped-signature");
    xml1.UpdateAttrAt(L"Transform[1]",true,L"Algorithm",L"http://www.w3.org/2001/10/xml-exc-c14n#");

    gen.AddSameDocRef2(L"01800228774059001001501012022091516941989060",L"sha256",xml1,L"");

    // Provide a certificate + private key. (PFX password is test123)
    CkCertW cert;
    success = cert.LoadPfxFile(L"qa_data/pfx/cert_test123.pfx",L"test123");
    if (success != true) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    gen.SetX509Cert(cert,true);

    gen.put_KeyInfoType(L"X509Data");
    gen.put_X509Type(L"Certificate");

    // Load XML to be signed...
    CkStringBuilderW sbXml;
    xmlToSign.GetXmlSb(sbXml);

    gen.put_Behaviors(L"IndentedSignature");

    // Sign the XML...
    success = gen.CreateXmlDSigSb(sbXml);
    if (success != true) {
        wprintf(L"%s\n",gen.lastErrorText());
        return;
    }

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

    // Save the signed XML to a file.
    success = sbXml.WriteFile(L"c:/temp/qa_output/signedXml.xml",L"utf-8",false);

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

    // ----------------------------------------
    // Verify the signatures we just produced...
    CkXmlDSigW verifier;
    success = verifier.LoadSignatureSb(sbXml);
    if (success != true) {
        wprintf(L"%s\n",verifier.lastErrorText());
        return;
    }

    int numSigs = verifier.get_NumSignatures();
    int verifyIdx = 0;
    while (verifyIdx < numSigs) {
        verifier.put_Selector(verifyIdx);
        bool verified = verifier.VerifySignature(true);
        if (verified != true) {
            wprintf(L"%s\n",verifier.lastErrorText());
            return;
        }

        verifyIdx = verifyIdx + 1;
    }

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