Lua Requires Chilkat v9.5.0.95+

AES-CMAC

See more Encryption Examples

Demonstrates using the AES-CMAC algorithm, which is a keyed hash function similar to HMAC and Poly1305. 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 the MAC algorithm to AES-CMAC
crypt.mac_algorithm = "aes-cmac"

-- AES-CMAC always uses a 16-byte (128-bit) MAC key.
local keyHex = "2b7e151628aed2a6abf7158809cf4f3c"
local success = crypt:set_mac_key_encoded(keyHex, "hex")

-- Let's compute the AES-CMAC for the test vector at https://www.rfc-editor.org/rfc/rfc4493#appendix-A
-- Here we have 64 bytes in hex representation.
local messageBytes = "6bc1bee22e409f96e93d7e117393172aae2d8a571e03ac9c9eb76fac45af8e5130c81c46a35ce411e5fbc1191a0a52eff69f2445df4f9b17ad2b417be66c3710"

local bd = chilkat.BinData.new()
bd:append_encoded(messageBytes, "hex")

-- Compute the AES-CMAC for the bytes contained in bd and return the AES-CMAC in hex representation.
crypt.encoding_mode = "hex_lower"
local cmac = crypt:mac_bd_enc(bd)
print(cmac)
-- Output should be: 51f0bebf7e3b9d92fc49741779363cfe

-- Now do the same for a string:
local plainText = "'Twas brillig, and the slithy toves\nDid gyre and gimble in the wabe:\nAll mimsy were the borogoves,\nAnd the mome raths outgrabe."
local encTag = crypt:mac_string_enc(plainText)
print(encTag)

-- Output should be: 4fca1fcbd265048d247f99ab57fa3ceb