Native Lua/LuaJIT RC4 stream cipher library
| Version | Module Dependencies | Remark |
|---|---|---|
| Lua 5.2 | bit32 |
|
| Lua 5.3 | bit32 |
bit32 has been deprecated |
| LuaJIT 2.0/2.1 | ffi, bit |
ffi C struct optimized |
local rc4 = require("rc4")
local key = "my_secret"
-- generate keystream
local rc4_ks_server = rc4(key)
local rc4_ks_client = rc4(key)
-- server encrypts messages
local msg_from_server_1 = "Hello"
local msg_from_server_2 = "This is SERVER"
local encrypted_msg_1 = rc4_ks_server(msg_from_server_1)
local encrypted_msg_2 = rc4_ks_server(msg_from_server_2)
-- client decrypts messages one after another
local decrypted_msg_1 = rc4_ks_client(encrypted_msg_1)
assert(msg_from_server_1 == decrypted_msg_1)
local decrypted_msg_2 = rc4_ks_client(encrypted_msg_2)
assert(msg_from_server_2 == decrypted_msg_2)# Lua 5.2.4
$ lua52 rc4.lua
RC4 keygen test 10.250 sec (100000 times, #key 8)
RC4 crypt test 68.980 sec (100000 times, #key 8, #input 512)
# Lua 5.3.1
$ lua53 rc4.lua
RC4 keygen test 10.280 sec (100000 times, #key 8)
RC4 crypt test 72.310 sec (100000 times, #key 8, #input 512)
# LuaJIT 2.0.4
$ luajit-2.0.4 rc4.lua
RC4 keygen test 0.310 sec (100000 times, #key 8)
RC4 crypt test 0.800 sec (100000 times, #key 8, #input 512)
# LuaJIT 2.1.0 beta1
$ luajit-2.1.0-beta1 rc4.lua
RC4 keygen test 0.280 sec (100000 times, #key 8)
RC4 crypt test 0.740 sec (100000 times, #key 8, #input 512)Copyright (c) 2015 Cheyi Lin. MIT licensed. See LICENSE for details.