Load and Validate a JWS from a String

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.LoadJws, which loads a JWS from its compact serialization string. The example then supplies the MAC key and validates the signature.

local chilkat = require("chilkat")

local jws = chilkat.Jws.new()

-- Load the JWS compact serialization.
local jwsCompact = "eyJhbGciOiJIUzI1NiJ9.VGhpcyBpcyB0aGUgY29udGVudCB0byBzaWduLg.<signature>"
local success = jws:load_jws(jwsCompact)
if not success then
    print(jws.last_error_text)
    return
end

-- Provide the HMAC key for signer 0, then validate the signature.  Validate returns 1 when the
-- signature is cryptographically valid, 0 when it is not, or a negative value on error.
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.")