(Go) Create CAdES-BES .p7m using Smart Card or USB Token

Demonstrates how to create a CAdES BES invoice.xml.p7m using a certificate stored on a smart card or USB token.

Note: This example requires Chilkat v9.5.0.77 and at the time of this writing is restricted to the Windows operating system.

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    // Note: Requires Chilkat v9.5.0.77 or greater.

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

    crypt := chilkat.NewCrypt2()

    // Use a certificate on a smartcard or USB token.
    cert := chilkat.NewCert()
    // Load the certificate on the smartcard currently in the reader (or on the USB token).
    // Pass an empty string to allow Chilkat to automatically choose the CSP (Cryptographi Service Provider).
    // See Load Certificate on Smartcard for information about explicitly selecting a particular CSP.
    success := cert.LoadFromSmartcard("")
    if success != true {
        fmt.Println(cert.LastErrorText())
        crypt.DisposeCrypt2()
        cert.DisposeCert()
        return
    }

    // Provide the smartcard PIN.
    // If the PIN is not explicitly provided here, the Windows OS should
    // display a dialog for the PIN.
    cert.SetSmartCardPin("000000")

    // Provide the certificate for signing.
    success = crypt.SetSigningCert(cert)
    if success != true {
        fmt.Println(crypt.LastErrorText())
        crypt.DisposeCrypt2()
        cert.DisposeCert()
        return
    }

    // Indicate that SHA-256 should be used.
    crypt.SetHashAlgorithm("sha256")

    // Specify the signed attributes to be included.
    // (This is what makes it CAdES-BES compliant.)
    jsonSignedAttrs := chilkat.NewJsonObject()
    jsonSignedAttrs.UpdateInt("contentType",1)
    jsonSignedAttrs.UpdateInt("signingTime",1)
    jsonSignedAttrs.UpdateInt("messageDigest",1)
    jsonSignedAttrs.UpdateInt("signingCertificateV2",1)
    crypt.SetSigningAttributes(*jsonSignedAttrs.Emit())

    inFile := "qa_data/xml/IT01234567890_11002.xml"
    sigFile := "qa_output/IT01234567890_11002.xml.p7m"

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

    fmt.Println("Success.")

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