(C#) 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.

Chilkat.BinData bd = new Chilkat.BinData();
bool success = bd.LoadFile("qa_data/p7m/IT01879020517_abc.xml.p7m");
if (success != true) {
    Debug.WriteLine("Failed to load the .p7m file");
    return;
}

Chilkat.Crypt2 crypt = new Chilkat.Crypt2();

// 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.
bool bVerified = crypt.OpaqueVerifyBd(bd);
if (bVerified != true) {
    Debug.WriteLine(crypt.LastErrorText);
    Debug.WriteLine("Failed to extract and verify.");
    return;
}

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

// Alternatively, load into an XML object and emit.
Chilkat.Xml xml = new Chilkat.Xml();
xml.LoadXml(bd.GetString("utf-8"));

Debug.WriteLine(xml.GetXml());