Load and Validate a JWS from a String

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.LoadJws, which loads a JWS from its compact serialization string. The example then supplies the MAC key and validates the signature.

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

success = 0

set jws = CreateObject("Chilkat.Jws")

'  Load the JWS compact serialization.
jwsCompact = "eyJhbGciOiJIUzI1NiJ9.VGhpcyBpcyB0aGUgY29udGVudCB0byBzaWduLg.<signature>"
success = jws.LoadJws(jwsCompact)
If (success = 0) Then
    outFile.WriteLine(jws.LastErrorText)
    WScript.Quit
End If

'  Provide the HMAC key for signer 0, then validate the signature.  Validate returns 1 when the
'  signature is cryptographically valid, 0 when it is not, or a negative value on error.
base64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
success = jws.SetMacKey(0,base64Key,"base64")
If (success = 0) Then
    outFile.WriteLine(jws.LastErrorText)
    WScript.Quit
End If

v = jws.Validate(0)
If (v < 0) Then
    outFile.WriteLine(jws.LastErrorText)
    WScript.Quit
End If

If (v <> 1) Then
    outFile.WriteLine("The signature is not valid.")
    WScript.Quit
End If

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

outFile.Close