(Xojo Plugin) Verify XAdES with External File Reference

Demonstrates how to validate an XML digital signature that contains a reference to an external file. (This is one way of doing it..)

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.

// Load the XAdES file to be validated..
Dim sbXml As New Chilkat.StringBuilder
Dim success As Boolean
success = sbXml.LoadFile("qa_data/xml_dsig_valid_samples/externalFile/test.pdf.XAdES","utf-8")
If (success = False) Then
    System.DebugLog("Failed to load XAdES input file.")
    Return
End If

Dim validator As New Chilkat.XmlDSig

// Specify a set of absolute or relative directory paths to be searched for any external file references.
// Directory paths are separated by semicolon chars.
validator.ExternalRefDirs = "qa_data/externalFiles;qa_data/xml_dsig_valid_samples/externalFile;c:/someOtherDir"

success = validator.LoadSignatureSb(sbXml)
If (success = False) Then
    System.DebugLog(validator.LastErrorText)
    Return
End If

// Validate signatures as usual..
Dim i As Int32
i = 0
While i < validator.NumSignatures
    validator.Selector = i

    Dim valid As Boolean
    valid = validator.VerifySignature(True)
    System.DebugLog("Signature " + Str(i + 1) + " and all reference digests OK = " + Str(valid))

    i = i + 1
Wend