Classic ASP

Create JWT using a Brainpool EC Key

Demonstrates how to create a JWT using an EC private key. This is for JOSE headers having an "alg" member with any of the following values:

BP160R1
BP192R1
BP224R1
BP256R1
BP320R1
BP384R1
BP512R1

This example also demonstrates how to include time constraints:

nbf: Not Before Time
exp: Expiration Time
iat: Issue At Time

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Classic ASP

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

' Demonstrates how to create a JWT using a brainpool EC private key.

' This example requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

set privKey = Server.CreateObject("Chilkat.PrivateKey")

' Load a brainpool EC key.
success = privKey.LoadPemFile("c:/qa_data/pem/ec_brainpool_privKey.pem")
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( privKey.LastErrorText) & "</pre>"
    Response.End
End If

' You can examine the curve name of the key you just loaded by getting the private in XML format:
' <ECCKeyValue curve="CURVE_NAME">...</ECCKeyValue>
Response.Write "<pre>" & Server.HTMLEncode( privKey.GetXml()) & "</pre>"

set jwt = Server.CreateObject("Chilkat.Jwt")

' Build the JOSE header
set jose = Server.CreateObject("Chilkat.JsonObject")
' Use the brainpool curve name matching the private key you just loaded.
' Use "BP256R1", or "BP384R1", etc.   
success = jose.AppendString("alg","BP256R1")
success = jose.AppendString("typ","JWT")

' Now build the JWT claims (also known as the payload)
set claims = Server.CreateObject("Chilkat.JsonObject")
success = claims.AppendString("iss","http://example.org")
success = claims.AppendString("sub","John")
success = claims.AppendString("aud","http://example.com")

' Set the timestamp of when the JWT was created to now.
curDateTime = jwt.GenNumericDate(0)
success = claims.AddIntAt(-1,"iat",curDateTime)

' Set the "not process before" timestamp to now.
success = claims.AddIntAt(-1,"nbf",curDateTime)

' Set the timestamp defining an expiration time (end time) for the token
' to be now + 1 hour (3600 seconds)
success = claims.AddIntAt(-1,"exp",curDateTime + 3600)

' Produce the smallest possible JWT:
jwt.AutoCompact = 1

' Create the JWT token.  This is where the ECC signature is created.
token = jwt.CreateJwtPk(jose.Emit(),claims.Emit(),privKey)

Response.Write "<pre>" & Server.HTMLEncode( token) & "</pre>"

%>
</body>
</html>