Lua

Encrypt Binary Content to a JWE

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.EncryptBd, which encrypts binary content held in a BinData and writes the resulting JWE into a StringBuilder.

Background. JWE (JSON Web Encryption) protects content with a content-encryption algorithm (the header enc value) while the content-encryption key is managed by the key-management algorithm (the header alg value). This example uses AES key wrapping with a symmetric wrapping key.

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Lua

local chilkat = require("chilkat")

local jwe = chilkat.Jwe.new()

-- Set the JWE protected header, specifying the key-management algorithm (alg) and the content-
-- encryption algorithm (enc).
local header = chilkat.JsonObject.new()
header:update_string("alg", "A256KW")
header:update_string("enc", "A256GCM")
local success = jwe:set_protected_header(header)
if not success then
    print(jwe.last_error_text)
    return
end

-- The 256-bit key-wrapping key (base64) for recipient index 0.  In production, obtain the key
-- from a secure source rather than hard-coding it.
local base64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
success = jwe:set_wrapping_key(0, base64Key, "base64")
if not success then
    print(jwe.last_error_text)
    return
end

-- Encrypt binary content held in a BinData, writing the resulting JWE into a StringBuilder.
local bdContent = chilkat.BinData.new()
bdContent:append_string("Binary content to encrypt.", "utf-8")

local sbJwe = chilkat.StringBuilder.new()
success = jwe:encrypt_bd(bdContent, sbJwe)
if not success then
    print(jwe.last_error_text)
    return
end

print(sbJwe:get_as_string())