Lua

Load a JWE from a String

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.LoadJwe, which loads a JWE from its compact serialization string so it can be decrypted.

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()

-- Load a JWE from its compact serialization string.
local jweCompact = "eyJhbGciOiJBMjU2S1ciLCJlbmMiOiJBMjU2R0NNIn0.<...>.<iv>.<ciphertext>.<tag>"
local success = jwe:load_jwe(jweCompact)
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

-- The loaded JWE can now be decrypted.
local content = jwe:decrypt(0, "utf-8")
if not jwe.last_method_success then
    print(jwe.last_error_text)
    return
end

print(content)