Lua

HMAC Hex String

See more Encryption Examples

Demonstrates how to compute an HMAC using a hexidecimal key and data. 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 HMAC
crypt.mac_algorithm = "hmac"

-- Our HMAC key will be the bytes represented in the following hex string.
-- In other words, the HMAC key is composed of the bytes 0x41, 0xC2, 0x1C, ...
-- (It is not composed of the us-ascii string '4', '1', 'C', ...)
local keyHex = "41C21CB9D7A02FC5D4FADB9E4755B9DE"
local success = crypt:set_mac_key_encoded(keyHex, "hex")

-- Our desire is to HMAC the bytes represented in the following string:
local dataHex = "C22078065B01460001000000010062043BF5B18228C8E02D17BCFE4E00561FA6DEC216EA97195CEB579942E275C21932258E3CD391E507FF4E7FD4C787A8447DA111C54A9C1795E7FF4C0BAA2EDA"

-- We'll need to decode the hex to binary:
local bd = chilkat.BinData.new()
bd:append_encoded(dataHex, "hex")

-- Do the HMAC-SHA256 hash and return as a hex string:
crypt.encoding_mode = "hex"
crypt.hash_algorithm = "sha-256"
local macHex = crypt:mac_bd_enc(bd)
print(macHex)