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Create a JWS

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.CreateJws, which creates and returns a JWS from the current payload, headers, and signing key.

Background. JWS (JSON Web Signature) integrity-protects a payload with a signature or MAC. The header alg names the algorithm; this example uses HMAC-SHA256 (HS256) with a symmetric MAC key.

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Local $bSuccess = False

$oJws = ObjCreate("Chilkat.Jws")

;  Set the protected header for signer 0, specifying the signature algorithm (alg).
$oHeader = ObjCreate("Chilkat.JsonObject")
$oHeader.UpdateString("alg","HS256")
$bSuccess = $oJws.SetProtectedHeader(0,$oHeader)
If ($bSuccess = False) Then
    ConsoleWrite($oJws.LastErrorText & @CRLF)
    Exit
EndIf

;  Set the payload to be signed.
Local $bIncludeBom = False
$bSuccess = $oJws.SetPayload("This is the content to sign.","utf-8",$bIncludeBom)
If ($bSuccess = False) Then
    ConsoleWrite($oJws.LastErrorText & @CRLF)
    Exit
EndIf

;  Provide the HMAC key (base64) for signer 0.  In production, obtain the key from a secure source
;  rather than hard-coding it.
Local $sBase64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
$bSuccess = $oJws.SetMacKey(0,$sBase64Key,"base64")
If ($bSuccess = False) Then
    ConsoleWrite($oJws.LastErrorText & @CRLF)
    Exit
EndIf

;  Create the JWS from the current payload, headers, and signing key.  The returned string is the
;  JWS (compact serialization by default).
Local $sJwsCompact = $oJws.CreateJws()
If ($oJws.LastMethodSuccess = False) Then
    ConsoleWrite($oJws.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite($sJwsCompact & @CRLF)