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.

local chilkat = require("chilkat")

local jws = chilkat.Jws.new()

-- 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.
local sbJws = chilkat.StringBuilder.new()
local bLoaded = sbJws:load_file("qa_data/message.jws", "utf-8")
if not bLoaded then
    print("Failed to load the JWS file.")
    return
end

-- Load the JWS from the StringBuilder.
local success = jws:load_jws_sb(sbJws)
if not success then
    print(jws.last_error_text)
    return
end

local base64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
success = jws:set_mac_key(0, base64Key, "base64")
if not success then
    print(jws.last_error_text)
    return
end

local v = jws:validate(0)
if v < 0 then
    print(jws.last_error_text)
    return
end

if v ~= 1 then
    print("The signature is not valid.")
    return
end

print("The signature is valid.")