Lua

Load a Private Key from BinData (Any Format)

Demonstrates the Chilkat PrivateKey.LoadAnyFormat method, which loads a private key by inspecting the bytes in a BinData. The first argument is the BinData and the second is the password (used if the detected key is encrypted).

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own key file.

Background: When you have key bytes in memory but do not know their exact format — downloaded, decrypted, or pulled from a database — this figures it out for you, recognizing PKCS #1/#8 DER, encrypted PKCS #8, PEM, JWK, Chilkat XML, Microsoft formats, and more. It removes the guesswork of choosing a specific loader, at the small cost of the detection step. Supply the password so it can decrypt an encrypted key without a second call.

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Lua

local chilkat = require("chilkat")

-- Demonstrates the PrivateKey.LoadAnyFormat method, which loads a private key by inspecting the
-- bytes in a BinData.  The 1st argument is the BinData and the 2nd is the password (used if the
-- detected key is encrypted).

local bd = chilkat.BinData.new()
local success = bd:load_file("qa_data/some_private_key")
if not success then
    print(bd.last_error_text)
    return
end

local privKey = chilkat.PrivateKey.new()

-- 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"

-- Chilkat auto-detects the representation: PKCS #1/#8 DER, encrypted PKCS #8, PEM, JWK,
-- Chilkat XML, Microsoft formats, and more.
success = privKey:load_any_format(bd, password)
if not success then
    print(privKey.last_error_text)
    return
end

print("Loaded a " .. privKey.key_type .. " private key.")