Rot13 in Lua

Published on 28 April 2022 (Updated: 18 September 2022)

Rot13 in Lua

Welcome to the Rot13 in Lua page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

local function ascii_base(s)
  return s:lower() == s and ('a'):byte() or ('A'):byte()
end

function caesar_cipher(str, key)
  return (str:gsub('%a', function(s)
    local base = ascii_base(s)
    return string.char(((s:byte() - base + key) % 26) + base)
  end))
end

if (#arg < 1 or arg[1] == "")
then
    print('Usage: please provide a string to encrypt')
else
    io.write(caesar_cipher(arg[1], 13))
end

io.write("\n")

Rot13 in Lua was written by:

If you see anything you'd like to change or update, please consider contributing.

Note: The solution shown above is the current solution in the Sample Programs repository as of Oct 15 2020 19:22:39. The solution was first committed on Oct 18 2019 23:31:32. As a result, documentation below may be outdated.

How to Implement the Solution

No 'How to Implement the Solution' section available. Please consider contributing.

How to Run the Solution

No 'How to Run the Solution' section available. Please consider contributing.