Lua Requires Chilkat v9.5.0.66+

Get ECC Public Key in JWK Format (JSON Web Key)

See more ECC Examples

Demonstrates how to get an ECC public key in JWK (JSON Web Key) format. Lua

local chilkat = require("chilkat")

-- Load a PEM file into memory.
local sbPem = chilkat.StringBuilder.new()
local success = sbPem:load_file("qa_data/pem/ecc_public.pem", "utf-8")
if not success then
    print("Failed to load PEM file.")
    return
end

-- Load the PEM into a public key object.
local pubKey = chilkat.PublicKey.new()
success = pubKey:load_from_string(sbPem:get_as_string())
if not success then
    print(pubKey.last_error_text)
    return
end

-- Get the public key in JWK format:
local jwk = pubKey:get_jwk()

-- The GetJwk method will return the JWK in the most compact JSON format possible,
-- as a single line with no extra whitespace.  To get a more human-readable JWK (for this example),
-- load into a Chilkat JSON object and emit non-compact:

local json = chilkat.JsonObject.new()
json:load(jwk)
json.emit_compact = false
print("ECC Public Key in JWK format:")
print(json:emit())

-- Sample output:
-- {
--   "kty": "EC",
--   "crv": "P-256",
--   "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
--   "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU"
-- }
--
-- Additional information can be added like this:
json:append_string("use", "enc")
json:append_string("kid", "123ABC")

-- Now examine the JSON:
print(json:emit())

-- {
--   "kty": "EC",
--   "crv": "P-256",
--   "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
--   "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU",
--   "use": "enc",
--   "kid": "123ABC"
-- }