AutoIt

Validate JWS Using HMAC SHA-256

See more JSON Web Signatures (JWS) Examples

Validates a JSON Web Signature (JWS) using HMAC SHA-256. AutoIt

Local $bSuccess = False

; This requires the Chilkat API to have been previously unlocked.
; See Global Unlock Sample for sample code.

; This example takes a JSON signature in compact serialization format,
; and uses a MAC key to validate and recover the protected header and payload.

$oJws = ObjCreate("Chilkat.Jws")

; Set the HMAC key:
Local $sHmacKey = "AyM1SysPpbyDfgZld3umj1qzKObwVMkoqQ-EstJQLr_T-1qS0gZH75aKtMN3Yj0iPS4hcgUuTwjAzZr1Z9CAow"
Local $iSignatureIndex = 0
$oJws.SetMacKey($iSignatureIndex,$sHmacKey,"base64url")

; Load the JWS.
Local $sJwsCompact = "eyJ0eXAiOiJKV1QiLA0KICJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJqb2UiLA0KICJleHAiOjEzMDA4MTkzODAsDQogImh0dHA6Ly9leGFtcGxlLmNvbS9pc19yb290Ijp0cnVlfQ.dBjftJeZ4CVP-mB92K27uhbUJU1p1r_wW1gFWFOEjXk"
$bSuccess = $oJws.LoadJws($sJwsCompact)

; Validate the 1st (and only) signature at index 0..
Local $iV = $oJws.Validate($iSignatureIndex)
If ($iV < 0) Then
    ; Perhaps Chilkat was not unlocked or the trial expired..
    ConsoleWrite("Method call failed for some other reason." & @CRLF)
    ConsoleWrite($oJws.LastErrorText & @CRLF)
    Exit
EndIf

If ($iV = 0) Then
    ConsoleWrite("Invalid signature.  The MAC key was incorrect, the JWS was invalid, or both." & @CRLF)
    Exit
EndIf

; If we get here, the signature was validated..
ConsoleWrite("Signature validated." & @CRLF)

; Recover the original content:
ConsoleWrite("Recovered content:" & @CRLF)
ConsoleWrite($oJws.GetPayload("utf-8") & @CRLF)

; Examine the protected header:

$oJoseHeader = ObjCreate("Chilkat.JsonObject")
$bSuccess = $oJws.GetProtectedH($iSignatureIndex,$oJoseHeader)
If ($bSuccess = False) Then
    ConsoleWrite($oJws.LastErrorText & @CRLF)
    Exit
EndIf

$oJoseHeader.EmitCompact = False

ConsoleWrite("Protected (JOSE) header:" & @CRLF)
ConsoleWrite($oJoseHeader.Emit() & @CRLF)

; Output:

; 	Signature validated.
; 	Recovered content:
; 	{"iss":"joe",
; 	 "exp":1300819380,
; 	 "http://example.com/is_root":true}
; 	Protected (JOSE) header:
; 	{ 
; 	  "typ": "JWT",
; 	  "alg": "HS256"
; 	}