Load and Validate a JWS from a StringBuilder

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.LoadJwsSb, which loads a JWS from a StringBuilder (here read from a file). The example then supplies the MAC key and validates the signature.

The file path is relative to the application's current working directory. An absolute path may also be used. Supply the path appropriate to your own environment.

Dim success As Boolean = False

Dim jws As New Chilkat.Jws

'  The file path is relative to the application's current working directory.  An absolute path may
'  also be used.  Supply the path appropriate to your own environment.

'  Load the JWS text from a file into a StringBuilder.
Dim sbJws As New Chilkat.StringBuilder
Dim bLoaded As Boolean = sbJws.LoadFile("qa_data/message.jws","utf-8")
If (bLoaded <> True) Then
    Debug.WriteLine("Failed to load the JWS file.")
    Exit Sub
End If


'  Load the JWS from the StringBuilder.
success = jws.LoadJwsSb(sbJws)
If (success = False) Then
    Debug.WriteLine(jws.LastErrorText)
    Exit Sub
End If


Dim base64Key As String = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
success = jws.SetMacKey(0,base64Key,"base64")
If (success = False) Then
    Debug.WriteLine(jws.LastErrorText)
    Exit Sub
End If


Dim v As Integer = jws.Validate(0)
If (v < 0) Then
    Debug.WriteLine(jws.LastErrorText)
    Exit Sub
End If

If (v <> 1) Then
    Debug.WriteLine("The signature is not valid.")
    Exit Sub
End If

Debug.WriteLine("The signature is valid.")