Lua

HMAC SHA-1 Matching FIPS Examples

See more Encryption Examples

Provides an example of computing an HMAC-SHA1 digest to duplicate the FIPS examples at http://csrc.nist.gov/publications/fips/fips198/fips-198a.pdf 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()

local strToSign = "Sample #1"

-- 64-byte key
local key = "000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f"

-- The expected result:
-- (from Appendix A.1 at http://csrc.nist.gov/publications/fips/fips198/fips-198a.pdf )
local expectedResult = "4f4ca3d5d68ba7cc0a1208c9c61e9c5da0403c0a"

-- Here is the code to duplicate the results:
crypt.hash_algorithm = "sha-1"
crypt.encoding_mode = "hex"
crypt.mac_algorithm = "hmac"

crypt:set_mac_key_encoded(key, "hex")

local mac = crypt:mac_string_enc(strToSign)

print("Computed: " .. mac)
print("Expected: " .. expectedResult)