Classic ASP Requires Chilkat v11.0.0+
ABN AMRO Create Signed JSON Web Token

Demonstrates how to create a signed JWT to be used for authenticating requests to the ABN AMRO REST API's.
Chilkat Classic ASP Downloads

Classic ASP
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<%
success = 0

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

'  Create public/private key pair (RSA)
set rsa = Server.CreateObject("Chilkat.Rsa")

'  Generate a 2048-bit key.
set privkey = Server.CreateObject("Chilkat.PrivateKey")
success = rsa.GenKey(2048,privkey)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( rsa.LastErrorText) & "</pre>"
    Response.End
End If

'  Export the key to PEM files.
'  Write one PEM file for the private key, and one for the public key.
success = privkey.SavePemFile("qa_data/pem/abnAmroPrivateKey.pem")

set pubkey = Server.CreateObject("Chilkat.PublicKey")
success = privkey.ToPublicKey(pubkey)
success = pubkey.SavePemFile(1,"qa_data/pem/abnAmroPublicKey.pem")
'  Note: Please share your public key along with your app name and developer email id at api.support@nl.abnamro.com. 
'  Token generation will not work unless public key is associated with your app.

'  Create the JWT.
set jwt = Server.CreateObject("Chilkat.Jwt")

'  Create the header:
'  {
'      "typ": "JWT",
'      "alg": "RS256"
'  }
set jsonHeader = Server.CreateObject("Chilkat.JsonObject")
success = jsonHeader.UpdateString("typ","JWT")
success = jsonHeader.UpdateString("alg","RS256")

'  Create the payload:
'  {
'      "nbf": 1499947668,
'      "exp": 1499948668,
'      "iss": "me",
'      "sub": "anApiKey",
'      "aud": "https://auth-sandbox.abnamro.com/oauth/token"
'  }
set jsonPayload = Server.CreateObject("Chilkat.JsonObject")

curDateTime = jwt.GenNumericDate(0)

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

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

success = jsonPayload.UpdateString("iss","me")
success = jsonPayload.UpdateString("sub","anApiKey")
success = jsonPayload.UpdateString("aud","https://auth-sandbox.abnamro.com/oauth/token")

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

jwtStr = jwt.CreateJwtPk(jsonHeader.Emit(),jsonPayload.Emit(),privkey)
If (jwt.LastMethodSuccess = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( jwt.LastErrorText) & "</pre>"
    Response.End
End If

'  Here is the JWT:
Response.Write "<pre>" & Server.HTMLEncode( jwtStr) & "</pre>"

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