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Showing content from https://github.com/bungle/lua-resty-scrypt below:

bungle/lua-resty-scrypt: LuaJIT FFI-based scrypt library for OpenResty.

lua-resty-scrypt is a scrypt (password) hashing library for OpenResty.

local scrypt = require "resty.scrypt"
local hash   = scrypt.crypt "My Secret"         -- returns a hash that can be stored in db
local valid  = scrypt.check("My Secret", hash)  -- valid holds true
local valid  = scrypt.check("My Guess",  hash)  -- valid holds false

local n,r,p  = scrypt.calibrate()               -- returns n,r,p calibration values

Just place scrypt.lua somewhere in your package.path, preferably under resty directory. If you are using OpenResty, the default location would be /usr/local/openresty/lualib/resty.

These are just rudimentary notes. Better installation instructions will follow:

1. First download Scrypt from here: https://github.com/bungle/lua-scrypt
2. Run make
3. Place scrypt.so|scrypt.dylib|scrypt.dll somewhere in the default search path for dynamic libraries of your operating system (or modify scrypt.lua and point ffi_load("scrypt") with full path to scrypt.so|scrypt.dylib|scrypt.dll, e.g. local scrypt = ffi_load("/usr/local/lib/lua/5.1/scrypt.so")).

If you are using LuaRocks >= 2.2:

$ luarocks install lua-resty-scrypt

If you are using LuaRocks < 2.2:

$ luarocks install --server=http://rocks.moonscript.org moonrocks
$ moonrocks install lua-resty-scrypt

MoonRocks repository for lua-resty-scrypt is located here: https://rocks.moonscript.org/modules/bungle/lua-resty-scrypt.

Uses scrypt algorithm to generate hash from the input. Input parameter opts can either be string (a secret) or a table. If it is a table you may pass in some configuration parameters as well. Available table options (defaults are as follows):

local opts = {
    secret   = "",
    keysize  = 32,
    n        = 32768,
    r        = 8,
    p        = 1,
    salt     = "random (saltsize) bytes generated with OpenSSL",
    saltsize = 8
}

If you pass opts anything other than a table, it will be tostringified and used as a secret. keysize can be between 16 and 512, saltsize can be between 8 and 32.

This function returns string that looks like this:

All parts present a hex dump of their values.

local h1 = scrypt.crypt "My Secret"
local h2 = scrypt.crypt{
    secret  = "My Secret",
    keysize = 512 
}

With this function you can check if the secret really matches with the hash that was generated with scrypt.crypt from the same secret. The hash contains also the configuration parameters like n, r, p and salt.

local b1 = scrypt.check("My Secret", scrypt.crypt "My Secret") -- returns true
local b2 = scrypt.check("My Secret", scrypt.crypt "No Secret") -- returns false

This function can be used to count n, r, and p configuration values from maxmem, maxmemfrac and maxtime parameters. These are the defaults for those:

maxmem     = 1048576
maxmemfrac = 0.5
maxtime    = 0.2

The results may change depending on your computer's processing power.

local n,r,p = scrypt.calibrate()
local hash  = scrypt.crypt{
    secret  = "My Secret",
    n = n,
    r = r,
    p = p
}

Counts the memory use of scrypt-algorigth with the provided n, r, and p arguments.

local memoryuse = scrypt.memoryuse(scrypt.calibrate())

Default parameters for n, r, and p are:

lua-resty-scrypt uses two clause BSD license.

Copyright (c) 2014, Aapo Talvensaari
All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice, this
  list of conditions and the following disclaimer.

* Redistributions in binary form must reproduce the above copyright notice, this
  list of conditions and the following disclaimer in the documentation and/or
  other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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