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Verify JWT with EdDSA / Ed25519 Signature

See more JSON Web Token (JWT) Examples

Note: This example requires Chilkat v9.5.0.84 or greater.

Demonstrates how to verify a JWT that was signed using an Ed25519 private key.

This example verifies the EdDSA 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 data.

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Local $bSuccess = False

; Demonstrates how to verify a JWT with an EdDSA/Ed25519 Signature
; *** Requires Chilkat v9.5.0.84 or greater.

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

; Use this Ed25519 public key for verification

Local $sJsonPubKey = "{""kty"": ""OKP"",""alg"": ""EdDSA"",""crv"": ""Ed25519"",""x"": ""11qYAYKxCrfVS_7TyWQHOg7hcvPapiMlrwIaaPcHURo""}"

$oPubKey = ObjCreate("Chilkat.PublicKey")
$bSuccess = $oPubKey.LoadFromString($sJsonPubKey)
If ($bSuccess = False) Then
    ConsoleWrite($oPubKey.LastErrorText & @CRLF)
    Exit
EndIf

$oJwt = ObjCreate("Chilkat.Jwt")
Local $sToken = "eyJhbGciOiJFZERTQSJ9.RXhhbXBsZSBvZiBFZDI1NTE5IHNpZ25pbmc.hgyY0il_MGCjP0JzlnLWG1PPOt7-09PGcvMg3AIbQR6dWbhijcNR4ki4iylGjg5BhVsPt9g7sVvpAr_MuM0KAg"

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

If ($bSigVerified = False) Then
    ConsoleWrite($oJwt.LastErrorText & @CRLF)
    Exit
EndIf

; 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)

; Recover the original data (the payload).
Local $sPayload = $oJwt.GetPayload($sToken)
ConsoleWrite($sPayload & @CRLF)

; Recover the original JOSE header in the same way:
Local $sJoseHeader = $oJwt.GetHeader($sToken)
ConsoleWrite($sJoseHeader & @CRLF)