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Verify JWT Using an RSA Public Key (RS256, RS384, RS512)

Demonstrates how to verify a JWT that was signed using an RSA private key.

This example verifies the RSA signature. It also does the following:

Checks to see if the time constraints ("nbf" and "exp") are valid.
Recovers the original JOSE header.
Recovers the original claims JSON.

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Local $bSuccess = False

; Demonstrates how to verify an JWT using an RSA public key.

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

$oPubKey = ObjCreate("Chilkat.PublicKey")
$bSuccess = $oPubKey.LoadFromFile("qa_data/pem/rsa_public.pem")

$oJwt = ObjCreate("Chilkat.Jwt")

Local $sToken = "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJodHRwOi8vZXhhbXBsZS5vcmciLCJzdWIiOiJKb2huIiwiYXVkIjoiaHR0cDovL2V4YW1wbGUuY29tIiwiaWF0IjoxNDYzNDQ1MjM4LCJuYmYiOjE0NjM0NDUyMzgsImV4cCI6MTQ2MzQ0ODgzOH0.XRtqed6nuJ9lrp0wbNdDX3fCkSh_d9cHAniPbNcqm7G-5N3mtI5ntQvZBDP3pHtECVqufuDwW7XgUtzAi0ZXhyiRm1iZ3wMSN5lHWv52OQJmMHPA7VPd8Q1hDG-tx-QswzJKd75OEUHP7wIXq2Mg_YVElfDvJI6TGjGyS1y-RLHlz-ldlGsEwIBkO0PtzIYTVov97x8p9KCsPNhS4lZUIqKOYoTZUV5LpuAWARl-636DfMEB_A5_IEaw_W8leh2suP2ULVZxwE-Tk1kBC9tsSGrBrPTtg7sziaV4Lbb0JRANmh98uTRu5f8ji9CVOnpbMiAzjsJSy56kz_olweXSuA"

; First verify the signature.
Local $bSigVerified = $oJwt.VerifyJwtPk($sToken,$oPubKey)
ConsoleWrite("verified: " & $bSigVerified & @CRLF)

; Let's see if the time constraints, if any, are valid.
; The above JWT was created on the afternoon of 16-May-2016, with an expiration of 1 hour.
; If the current system time is before the "nbf" time, or after the "exp" time,
; then IsTimeValid will return false/0.
; Also, we'll allow a leeway of 60 seconds to account for any clock skew.
; Note: If the token has no "nbf" or "exp" claim fields, then IsTimeValid is always true.
Local $iLeeway = 60
Local $bTimeValid = $oJwt.IsTimeValid($sToken,$iLeeway)
ConsoleWrite("time constraints valid: " & $bTimeValid & @CRLF)

; Now let's recover the original claims JSON (the payload).
Local $sPayload = $oJwt.GetPayload($sToken)
; The payload will likely be in compact form:
ConsoleWrite($sPayload & @CRLF)

; We can format for human viewing by loading it into Chilkat's JSON object
; and emit.
$oJson = ObjCreate("Chilkat.JsonObject")
$bSuccess = $oJson.Load($sPayload)
$oJson.EmitCompact = False
ConsoleWrite($oJson.Emit() & @CRLF)

; We can recover the original JOSE header in the same way:
Local $sJoseHeader = $oJwt.GetHeader($sToken)
; The payload will likely be in compact form:
ConsoleWrite($sJoseHeader & @CRLF)

; We can format for human viewing by loading it into Chilkat's JSON object
; and emit.
$bSuccess = $oJson.Load($sJoseHeader)
$oJson.EmitCompact = False
ConsoleWrite($oJson.Emit() & @CRLF)