(Xojo Plugin) Extract XML string from a .p7m byte array (e.g. FATTURA ELETTRONICA, ITALY)

Xojo Plugin example to extract the original XML from a .p7m (Signed-Data PKCS7 Format) provided as a byte array.

One use for this example is to extract the original XML from a Fattura Elettronica .p7m signature.

Chilkat Xojo Plugin Download Xojo Plugin for Windows, Linux, Mac OS X, and ARM, ARM64

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

Dim fac As New Chilkat.FileAccess
Dim p7mBytes As MemoryBlock
p7mBytes = fac.ReadEntireFile("testData/p7m/fattura_signature.p7m")
If (fac.LastMethodSuccess <> True) Then
    System.DebugLog(fac.LastErrorText)
    Return
End If

Dim crypt As New Chilkat.Crypt2

Dim originalXml As String
originalXml = crypt.OpaqueVerifyString(p7mBytes)
If (crypt.LastMethodSuccess <> True) Then
    System.DebugLog(fac.LastErrorText)
    Return
End If

System.DebugLog("Original XML:")
System.DebugLog(originalXml)

System.DebugLog("Success!")