(Go) 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.

Chilkat Go Downloads Go Package for Windows, MacOS, Linux, Alpine Linux, Solaris

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

    crypt := chilkat.NewCrypt2()
    crypt.SetVerboseLogging(true)

    cert := chilkat.NewCert()
    // Use your smart card user PIN for signing.
    cert.SetSmartCardPin("0000")

    success := cert.LoadFromSmartcard("")
    if success == false {
        fmt.Println(cert.LastErrorText())
        crypt.DisposeCrypt2()
        cert.DisposeCert()
        return
    }

    success = crypt.SetSigningCert(cert)
    if success == false {
        fmt.Println(crypt.LastErrorText())
        crypt.DisposeCrypt2()
        cert.DisposeCert()
        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.SetCadesEnabled(true)

    crypt.SetHashAlgorithm("sha256")

    signedAttrs := chilkat.NewJsonObject()
    signedAttrs.UpdateInt("contentType",1)
    signedAttrs.UpdateInt("signingTime",1)
    signedAttrs.UpdateInt("messageDigest",1)
    signedAttrs.UpdateInt("signingCertificateV2",1)
    crypt.SetSigningAttributes(*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>

    inputXmlPath := "c:/someDir/e-Invoice.xml"
    outputP7mPath := "c:/someDir/signed.p7m"

    // Create the CAdES-BES attached signature, which contains the original data.
    success = crypt.CreateP7M(inputXmlPath,outputP7mPath)
    if success == false {
        fmt.Println(crypt.LastErrorText())
        crypt.DisposeCrypt2()
        cert.DisposeCert()
        signedAttrs.DisposeJsonObject()
        return
    }

    fmt.Println("Success.")

    crypt.DisposeCrypt2()
    cert.DisposeCert()
    signedAttrs.DisposeJsonObject()