(C++) Italian FatturaPA (e-Invoice) Signed XML (CADES-BES P7M) using USB SmartCard Reader

Demonstrates Italian e-Invoice (FatturaPA) signing by using a private key stored on a USB smartcard reader.

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#include <CkCrypt2.h>
#include <CkCert.h>
#include <CkJsonObject.h>

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

    CkCrypt2 crypt;
    crypt.put_VerboseLogging(true);

    CkCert cert;
    // Use your smart card user PIN for signing.
    cert.put_SmartCardPin("0000");

    bool success = cert.LoadFromSmartcard("");
    if (success == false) {
        std::cout << cert.lastErrorText() << "\r\n";
        return;
    }

    success = crypt.SetSigningCert(cert);
    if (success == false) {
        std::cout << crypt.lastErrorText() << "\r\n";
        return;
    }

    // The CadesEnabled property applies to all methods that create PKCS7 signatures. 
    // To create a CAdES-BES signature, set this property equal to true.
    crypt.put_CadesEnabled(true);

    crypt.put_HashAlgorithm("sha256");

    CkJsonObject signedAttrs;
    signedAttrs.UpdateInt("contentType",1);
    signedAttrs.UpdateInt("signingTime",1);
    signedAttrs.UpdateInt("messageDigest",1);
    signedAttrs.UpdateInt("signingCertificateV2",1);
    crypt.put_SigningAttributes(signedAttrs.emit());

    // Load XML such as the following:
    //  <p:FatturaElettronica xmlns:p="http://ivaservizi.agenziaentrate.gov.it/docs/xsd/fatture/v1.2" versione="FPR12">
    //     <FatturaElettronicaHeader>
    //        <DatiTrasmissione>
    // 	...
    //        </DatiTrasmissione>
    //        <CedentePrestatore>
    // 	...
    //        </CedentePrestatore>
    //        <CessionarioCommittente>
    // 	...
    //        </CessionarioCommittente>
    //     </FatturaElettronicaHeader>
    //     <FatturaElettronicaBody>
    //        <DatiGenerali>
    //           <DatiGeneraliDocumento>
    // 		...
    //           </DatiGeneraliDocumento>
    //        </DatiGenerali>
    //        <DatiBeniServizi>
    // 	...
    //        </DatiBeniServizi>
    //     </FatturaElettronicaBody>
    //  </p:FatturaElettronica>

    const char *inputXmlPath = "c:/someDir/e-Invoice.xml";
    const char *outputP7mPath = "c:/someDir/signed.p7m";

    // Create the CAdES-BES attached signature, which contains the original data.
    success = crypt.CreateP7M(inputXmlPath,outputP7mPath);
    if (success == false) {
        std::cout << crypt.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "Success." << "\r\n";
    }