Lua

Export an Encrypted PKCS #8 Private Key as Encoded Text

Demonstrates the Chilkat PrivateKey.GetPkcs8EncryptedENC method, which exports the key as password-protected PKCS #8 DER and encodes the encrypted DER as text. The first argument names the binary encoding and the second is the password. The cipher is selected by Pkcs8EncryptAlg.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: This combines encryption with text encoding: the key is protected by a passphrase and returned as a string, ideal for storing an encrypted key in a text-only medium such as JSON or an environment variable. It is the encrypted counterpart to GetPkcs8ENC. Source the password securely.

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Lua

local chilkat = require("chilkat")

-- Load a private key to export.
local privKey = chilkat.PrivateKey.new()
local success = privKey:load_pem_file("qa_data/private.pem")
if not success then
    print(privKey.last_error_text)
    return
end

-- The key password is not hard-coded in a real application; obtain it from an interactive
-- prompt, environment variable, or a secrets vault.
local password = "myKeyPassword"

-- Export as password-protected PKCS #8 DER, then encode the encrypted DER as text.  The 1st
-- argument names the binary encoding and the 2nd is the password.  The cipher is selected by the
-- Pkcs8EncryptAlg property.
local encoded = privKey:get_pkcs8_encrypted_enc("base64", password)
if not privKey.last_method_success then
    print(privKey.last_error_text)
    return
end

print(encoded)