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JWS Using HMAC SHA-256

See more JSON Web Signatures (JWS) Examples

Creates a JSON Web Signatures (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.

; First create the JWS Protected Header
$oJwsProtHdr = ObjCreate("Chilkat.JsonObject")
$oJwsProtHdr.AppendString("typ","JWT")
$oJwsProtHdr.AppendString("alg","HS256")
ConsoleWrite("JWS Protected Header: " & $oJwsProtHdr.Emit() & @CRLF)

; Output:
; JWS Protected Header: {"typ":"JWT","alg":"HS256"}

$oJws = ObjCreate("Chilkat.Jws")

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

; Set the protected header:
$oJws.SetProtectedHeader($iSignatureIndex,$oJwsProtHdr)

; Set the payload.
Local $bIncludeBom = False
Local $sPayloadStr = "In our village, folks say God crumbles up the old moon into stars."
$oJws.SetPayload($sPayloadStr,"utf-8",$bIncludeBom)

; Create the JWS
; By default, the compact serialization is used.
Local $sJwsCompact = $oJws.CreateJws()
If ($oJws.LastMethodSuccess = False) Then
    ConsoleWrite($oJws.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("JWS: " & $sJwsCompact & @CRLF)

; sample output:
; JWS: eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu.bsYsi8HJ0N6OqGI1hKQ9QQRNPxxA5qMpcHLtOvXatk8

; Now load the JWS, validate, and recover the original text.
$oJws2 = ObjCreate("Chilkat.Jws")

; Load the JWS.
$bSuccess = $oJws2.LoadJws($sJwsCompact)

; Set the MAC key used for validation.
$iSignatureIndex = 0
$oJws2.SetMacKey($iSignatureIndex,$sHmacKey,"base64url")

; Validate the 1st (and only) signature at index 0..
Local $iV = $oJws2.Validate($iSignatureIndex)
If ($iV < 0) Then
    ; Perhaps Chilkat was not unlocked or the trial expired..
    ConsoleWrite("Method call failed for some other reason." & @CRLF)
    ConsoleWrite($oJws2.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($oJws2.GetPayload("utf-8") & @CRLF)

; Examine the protected header:

$oJoseHeader = ObjCreate("Chilkat.JsonObject")
$bSuccess = $oJws2.GetProtectedH($iSignatureIndex,$oJoseHeader)
If ($bSuccess = False) Then
    ConsoleWrite($oJws2.LastErrorText & @CRLF)
    Exit
EndIf

$oJoseHeader.EmitCompact = False

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

; Output:

; 	Signature validated.
; 	In our village, folks say God crumbles up the old moon into stars.
; 	Protected (JOSE) header:
; 	{ 
; 	  "typ": "JWT",
; 	  "alg": "HS256"
; 	}