Lua

PBES2 Password-Based Encryption

See more Encryption Examples

Demonstrates PBES2 encryption Lua

local chilkat = require("chilkat")

-- This example assumes the Chilkat API to have been previously unlocked.
-- See Global Unlock Sample for sample code.

local crypt = chilkat.Crypt2.new()

-- Set properties for PBES2 encryption:

-- When the encryption algorithm is set to "pbes2",
-- Chilkat will automatically derive the actual secret key using PBKDF2 and
-- the specified paramters: password, salt, iteration count, hash function, and desired key length.

crypt.crypt_algorithm = "pbes2"
crypt.pbes_password = "mySecretPassword"

-- Set the underlying PBE algorithm (and key length):
crypt.pbes_algorithm = "aes"
crypt.key_length = 256

crypt:set_encoded_iv("000102030405060708090A0B0C0D0E0F", "hex")

-- Give it some salt:
crypt:set_encoded_salt("0102030405060708", "hex")

-- A higher iteration count makes the algorithm more
-- computationally expensive and therefore exhaustive
-- searches (for breaking the encryption) is more difficult:
crypt.iteration_count = 1024

-- A hash algorithm needs to be set for PBES2:
crypt.hash_algorithm = "sha256"

-- Indicate that the encrypted bytes should be returned
-- as a hex string:
crypt.encoding_mode = "hex"

local plainText = "To be encrypted."

local encryptedText = crypt:encrypt_string_enc(plainText)

print(encryptedText)

-- Now decrypt:
local decryptedText = crypt:decrypt_string_enc(encryptedText)

print(decryptedText)