Validate a JWS with a Public Key

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.SetPublicKey, which sets the public key used to validate a signature of a loaded JWS.

The file path is relative to the application's current working directory. An absolute path may also be used. Supply the path appropriate to your own environment.

Local $bSuccess = False

$oJws = ObjCreate("Chilkat.Jws")

;  Load the JWS compact serialization.
Local $sJwsCompact = "eyJhbGciOiJIUzI1NiJ9.VGhpcyBpcyB0aGUgY29udGVudCB0byBzaWduLg.<signature>"
$bSuccess = $oJws.LoadJws($sJwsCompact)
If ($bSuccess = False) Then
    ConsoleWrite($oJws.LastErrorText & @CRLF)
    Exit
EndIf

;  The file path is relative to the application's current working directory.  An absolute path
;  may also be used.  Supply the path appropriate to your own environment.
;  Load the signer's public key and set it for validating signature 0.
$oPubKey = ObjCreate("Chilkat.PublicKey")
$bSuccess = $oPubKey.LoadFromFile("qa_data/signer_pubkey.pem")
If ($bSuccess = False) Then
    ConsoleWrite($oPubKey.LastErrorText & @CRLF)
    Exit
EndIf

$bSuccess = $oJws.SetPublicKey(0,$oPubKey)
If ($bSuccess = False) Then
    ConsoleWrite($oJws.LastErrorText & @CRLF)
    Exit
EndIf

;  Validate the signature.  Validate returns 1 when valid, 0 when not, or a negative value on error.
Local $iV = $oJws.Validate(0)
If ($iV < 0) Then
    ConsoleWrite($oJws.LastErrorText & @CRLF)
    Exit
EndIf

If ($iV <> 1) Then
    ConsoleWrite("The signature is not valid." & @CRLF)
    Exit
EndIf

ConsoleWrite("The signature is valid." & @CRLF)