Lua

Create JWT using a Brainpool EC Key

See more JSON Web Token (JWT) Examples

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

Lua

local chilkat = require("chilkat")

-- 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.

local privKey = chilkat.PrivateKey.new()

-- Load a brainpool EC key.
local success = privKey:load_pem_file("c:/qa_data/pem/ec_brainpool_privKey.pem")
if not success then
    print(privKey.last_error_text)
    return
end

-- You can examine the curve name of the key you just loaded by getting the private in XML format:
-- <ECCKeyValue curve="CURVE_NAME">...</ECCKeyValue>
print(privKey:get_xml())

local jwt = chilkat.Jwt.new()

-- Build the JOSE header
local jose = chilkat.JsonObject.new()
-- Use the brainpool curve name matching the private key you just loaded.
-- Use "BP256R1", or "BP384R1", etc.
success = jose:append_string("alg", "BP256R1")
success = jose:append_string("typ", "JWT")

-- Now build the JWT claims (also known as the payload)
local claims = chilkat.JsonObject.new()
success = claims:append_string("iss", "http://example.org")
success = claims:append_string("sub", "John")
success = claims:append_string("aud", "http://example.com")

-- Set the timestamp of when the JWT was created to now.
local curDateTime = jwt:gen_numeric_date(0)
success = claims:add_int_at(-1, "iat", curDateTime)

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

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

-- Produce the smallest possible JWT:
jwt.auto_compact = true

-- Create the JWT token.  This is where the ECC signature is created.
local token = jwt:create_jwt_pk(jose:emit(), claims:emit(), privKey)

print(token)