--[[
implementation of the RC5 cipher in Lua

03/11/2022
Sean Smith
sean@spacealien.xyz

w=word size in bits
r=number of rounds 
b=key size in bytes
K=secret key
u=w/8 (the length of a word in bytes)
K[] is the key as an array of bytes
c=length of key in words

]]

local insert
local concat
local tostring
local modf

local w=64
local r=24
local b=16
local K="globglogabgalab1"
local u=8
--local c=2 (with globglogabgalab1 as the key c should =2)

--magic constants for 64bit word size (hex)
local P = 0xb7e151628aed2a6b
local Q = 0x9e3779b97f4a7c15

--break K into words
--u = w / 8
c = math.ceil(math.max(b, 1) / u)
print(c)