function string_padding_dword(s)
	local l = 4 - string.len(s) % 4
	return s .. string.rep(string.char(l), l)
end

function string_unpadding_dword(s)
	return string.sub(s, 0, string.len(s) - string.byte(s, string.len(s)))
end

local buffer = "sampletext"
local CryptResult = encodeString('tea', string_padding_dword(buffer), { key = 'your_key_here' })
local DecryptResult = string_unpadding_dword( decodeString('tea', CryptResult, { key = 'your_key_here' }) )