(PowerShell) Verify XML Digital Signature

Verifies XML signatures in an XML file.

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.

$sbXml = New-Object Chilkat.StringBuilder
$success = $sbXml.LoadFile("qa_data/xml_dsig_verify/csioz_sample.xml","utf-8")
if ($success -ne $true) {
    $("Failed to load XML file.")
    exit
}

$dsig = New-Object Chilkat.XmlDSig

# First load the XML containing the signatures to be verified.
$success = $dsig.LoadSignatureSb($sbXml)
if ($success -ne $true) {
    $($dsig.LastErrorText)
    exit
}

# It's possible that an XML document can contain multiple signatures.
# Each can be verified as follows:
$i = 0
while ($i -lt $dsig.NumSignatures) {
    # Select the Nth signature by setting the Selector property.
    $dsig.Selector = $i

    # The bVerifyReferenceDigests argument determines if we want
    # to also verify each reference digest.  If set to $false,
    # then only the SignedInfo part of the Signature is verified.
    $bVerifyReferenceDigests = $true
    $bVerified = $dsig.VerifySignature($bVerifyReferenceDigests)
    $("Signature " + $i + 1 + " verified = " + $bVerified)

    $i = $i + 1
}