(PowerShell) 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 .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

# 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..
$sbXml = New-Object Chilkat.StringBuilder
$success = $sbXml.LoadFile("qa_data/xml_dsig_valid_samples/externalFile/test.pdf.XAdES","utf-8")
if ($success -eq $false) {
    $("Failed to load XAdES input file.")
    exit
}

$validator = New-Object 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 -eq $false) {
    $($validator.LastErrorText)
    exit
}

# Validate signatures as usual..
$i = 0
while ($i -lt $validator.NumSignatures) {
    $validator.Selector = $i

    $valid = $validator.VerifySignature($true)
    $("Signature " + $i + 1 + " and all reference digests OK = " + $valid)

    $i = $i + 1
}