Classic ASP

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.

Background. Validate returns 1 when the signature or MAC is cryptographically valid, 0 when it is not, or a negative value on error.

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Classic ASP

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
success = 0

set jws = Server.CreateObject("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.
set sbJws = Server.CreateObject("Chilkat.StringBuilder")
bLoaded = sbJws.LoadFile("qa_data/message.jws","utf-8")
If (bLoaded <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( "Failed to load the JWS file.") & "</pre>"
    Response.End
End If

'  Load the JWS from the StringBuilder.
success = jws.LoadJwsSb(sbJws)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( jws.LastErrorText) & "</pre>"
    Response.End
End If

base64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
success = jws.SetMacKey(0,base64Key,"base64")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( jws.LastErrorText) & "</pre>"
    Response.End
End If

v = jws.Validate(0)
If (v < 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( jws.LastErrorText) & "</pre>"
    Response.End
End If

If (v <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( "The signature is not valid.") & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( "The signature is valid.") & "</pre>"

%>
</body>
</html>