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 ChilkatJws
jws.Initialize

'  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 ChilkatStringBuilder
sbJws.Initialize
Dim bLoaded As Boolean = sbJws.LoadFile("qa_data/message.jws", "utf-8")
If bLoaded <> True Then
    Log("Failed to load the JWS file.")
    Return
End If


'  Load the JWS from the StringBuilder.
success = jws.LoadJwsSb(sbJws)
If success = False Then
    Log(jws.LastErrorText)
    Return
End If


Dim base64Key As String = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
success = jws.SetMacKey(0, base64Key, "base64")
If success = False Then
    Log(jws.LastErrorText)
    Return
End If


Dim v As Int = jws.Validate(0)
If v < 0 Then
    Log(jws.LastErrorText)
    Return
End If

If v <> 1 Then
    Log("The signature is not valid.")
    Return
End If

Log("The signature is valid.")