Xojo Plugin

Get a JWS Protected Header

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.GetProtectedH, which copies the decoded protected header of a signature into a JsonObject.

Background. The protected header is integrity-protected by the signature. Inspecting it (for example the alg value) is useful before deciding how to validate.

Chilkat Xojo Plugin Downloads

Download Chilkat for Xojo Plugin

Xojo Plugin

Dim success As Boolean
success = False

Dim jws As New Chilkat.Jws

//  Load the JWS compact serialization.
Dim jwsCompact As String
jwsCompact = "eyJhbGciOiJIUzI1NiJ9.VGhpcyBpcyB0aGUgY29udGVudCB0byBzaWduLg.<signature>"
success = jws.LoadJws(jwsCompact)
If (success = False) Then
    System.DebugLog(jws.LastErrorText)
    Return
End If

//  Copy the decoded protected header of signature 0 into a JsonObject.
Dim json As New Chilkat.JsonObject
success = jws.GetProtectedH(0,json)
If (success = False) Then
    System.DebugLog(jws.LastErrorText)
    Return
End If

json.EmitCompact = False
System.DebugLog(json.Emit())