Load and Validate a JWS from a String

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.LoadJws, which loads a JWS from its compact serialization string. The example then supplies the MAC key and validates the signature.

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 HMAC key for signer 0, then validate the signature.  Validate returns 1 when the
#  signature is cryptographically valid, 0 when it is not, or a negative value on error.
$base64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
$success = $jws.SetMacKey(0,$base64Key,"base64")
if ($success -eq $false) {
    $($jws.LastErrorText)
    exit
}

$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.")