Lua

AES Encrypt String (utf-8 byte representation) and return Base64

See more Encryption Examples

Demonstrates how to AES encrypt the utf-8 byte representation of a string and return in base64 format. Lua

local chilkat = require("chilkat")

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

local crypt = chilkat.Crypt2.new()

crypt.crypt_algorithm = "aes"
crypt.cipher_mode = "cbc"
crypt.key_length = 256
crypt.charset = "utf-8"
crypt.encoding_mode = "base64"

local ivHex = "000102030405060708090A0B0C0D0E0F"
crypt:set_encoded_iv(ivHex, "hex")
local keyHex = "000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F"
crypt:set_encoded_key(keyHex, "hex")

local encryptedStr = crypt:encrypt_string_enc("This is the original string")
print(encryptedStr)

-- Let's say we want to URL encode the base64 string..
crypt.crypt_algorithm = "none"
crypt.encoding_mode = "url"
local urlEncoded = crypt:encrypt_string_enc(encryptedStr)
print(urlEncoded)

-- Sample output:

--  q3fmgEqjqa9o//ZS6aPuh4Wtbrrxx/WOIQSKeVnesZg=
--  q3fmgEqjqa9o%2F%2FZS6aPuh4Wtbrrxx%2FWOIQSKeVnesZg%3D

-- -------------------------------------------------------------------
-- Now let's do the reverse...
--

-- We start with a string that is the binary encrypted data, base64 encoded, and then URL encoded.
local encBase64Url = "q3fmgEqjqa9o%2F%2FZS6aPuh4Wtbrrxx%2FWOIQSKeVnesZg%3D"

-- We'll use the same crypt object.  If using a new instance of the crypt object,
-- make sure *all* settings are identical:  the algorithm, cipher mode, key length, charset, encoding mode, IV, and secret key.

-- Decode from URL...
crypt.crypt_algorithm = "none"
crypt.encoding_mode = "url"
local encBase64 = crypt:decrypt_string_enc(urlEncoded)
print(encBase64)

-- Now decrypt...
crypt.crypt_algorithm = "aes"
crypt.encoding_mode = "base64"
local originalStr = crypt:decrypt_string_enc(encBase64)
print(originalStr)