Validate a JWS Signature

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.Validate, which validates exactly one signature, identified by a zero-based index, using the key configured at that same index.

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

$success = $false

$jws = New-Object Chilkat.Jws

#  Load the JWS compact serialization.
$jwsCompact = "eyJhbGciOiJIUzI1NiJ9.VGhpcyBpcyB0aGUgY29udGVudCB0byBzaWduLg.<signature>"
$success = $jws.LoadJws($jwsCompact)
if ($success -eq $false) {
    $($jws.LastErrorText)
    exit
}

#  Provide the key for signature 0 (here an HMAC key).
$base64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
$success = $jws.SetMacKey(0,$base64Key,"base64")
if ($success -eq $false) {
    $($jws.LastErrorText)
    exit
}

#  Validate the signature identified by the zero-based index, using the key configured at that index.
#  Validate returns 1 when the signature or MAC is cryptographically valid, 0 when it is not, or a
#  negative value on error.
$v = $jws.Validate(0)
if ($v -lt 0) {
    $($jws.LastErrorText)
    exit
}

if ($v -ne 1) {
    $("The signature is not valid.")
    exit
}

$("The signature is valid.")