(Go) Extract XML from FatturaPA .p7m

Demonstrates how to verify the signature and extract the XML from a FatturaPA .p7m file.

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

    bd := chilkat.NewBinData()
    success := bd.LoadFile("qa_data/p7m/IT01879020517_abc.xml.p7m")
    if success != true {
        fmt.Println("Failed to load the .p7m file")
        bd.DisposeBinData()
        return
    }

    crypt := chilkat.NewCrypt2()

    // Verify and extrct the payload contained within the .p7m.
    // In this case, the payload is the FatturaPA XML.
    // If successful, the resulting bd will contain only the XML.
    bVerified := crypt.OpaqueVerifyBd(bd)
    if bVerified != true {
        fmt.Println(crypt.LastErrorText())
        fmt.Println("Failed to extract and verify.")
        bd.DisposeBinData()
        crypt.DisposeCrypt2()
        return
    }

    // Save the XML to a file.
    bd.WriteFile("qa_output/zIT01879020517_abc.xml")

    // Alternatively, load into an XML object and emit.
    xml := chilkat.NewXml()
    xml.LoadXml(*bd.GetString("utf-8"))

    fmt.Println(*xml.GetXml())

    bd.DisposeBinData()
    crypt.DisposeCrypt2()
    xml.DisposeXml()