lua-openssl toolkit - A free, MIT-licensed OpenSSL binding for Lua.
#Index
I needed a full OpenSSL binding for Lua, after googled, I couldn't find a version to fit my needs. I found the PHP openssl binding is a good implementation, and it inspired me. So I decided to write this OpenSSL toolkit for Lua.
The goal is to fully support the listed items.Below you can find the development progress of lua-openssl.
- Symmetrical encrypt/decrypt. (Finished)
- Message digest. (Finished)
- Asymmetrical encrypt/decrypt/sign/verify/seal/open. (Finished)
- X509 certificate. (Finished)
- PKCS7/CMS. (Developing)
- SSL/TLS. (Finished)
Most of the lua-openssl functions require a key or certificate as argument; to make things easy to use OpenSSL, This rule allow you to specify certificates or keys in the following ways:
- As an openssl.x509 object returned from openssl.x509.read
- As an openssl.evp_pkey object return from openssl.pkey.read or openssl.pkey.new
Similarly, you can also specify a public key as a key object returned from x509:get_public().
digest,cipher, x509, cms and so on, be write as modules.
local digest = require'openssl'.digest
local cipher = require'openssl'.cipher
local crypto = require'crypto'
local ssl = require'ssl'digest() equals with digest.digest(), same cipher() equals with cipher.cipher().
Document please see here
crypto is a compat module with LuaCrypto, document should to reference
ssl is a compat module with luasec, document should to refrence. NYI list: conn:settimeout,...
The following are some important lua-openssl object types:
openssl.bio,
openssl.x509,
openssl.stack_of_x509,
openssl.x509_req,
openssl.evp_pkey,
openssl.evp_digest,
openssl.evp_cipher,
openssl.engine,
openssl.pkcs7,
openssl.cms,
openssl.evp_cipher_ctx,
openssl.evp_digest_ctx
...
They are shortened as bio, x509, sk_x509, csr, pkey, digest, cipher, engine, cipher_ctx, and digest_ctx.
- openssl.bn come from http://www.tecgraf.puc-rio.br/~lhf/ftp/lua/,thanks.
openssl.bn is a big-number library for Lua 5.1. It handles only integers and is suitable for number-theoretical and cryptographic applications. It is based on the bn subsystem of OpenSSL cryptographic library: http://www.openssl.org/docs/crypto/bn.html If you're running Unix, you probably already have OpenSSL installed.
To try the library, just edit Makefile to reflect your installation of Lua and then run make. This will build the library and run a simple test. For detailed installation instructions, see http://www.tecgraf.puc-rio.br/~lhf/ftp/lua/install.html
There is no manual but the library is simple and intuitive; see the summary below.
bn library:
__add(x,y) compare(x,y) pow(x,y)
__div(x,y) div(x,y) powmod(x,y,m)
__eq(x,y) divmod(x,y) random(bits)
__lt(x,y) gcd(x,y) rmod(x,y)
__mod(x,y) invmod(x) sqr(x)
__mul(x,y) isneg(x) sqrmod(x)
__pow(x,y) isodd(x) sqrtmod(x)
__sub(x,y) isone(x) sub(x,y)
__tostring(x) isprime(x,[checks]) submod(x,y,m)
__unm(x) iszero(x) text(t)
abs(x) mod(x,y) tohex(x)
add(x,y) mul(x,y) tonumber(x)
addmod(x,y,m) mulmod(x,y,m) tostring(x)
aprime(bits) neg(x) totext(x)
bits(x) number(x) version
This lua-openssl toolkit works with Lua 5.1 or 5.2, and OpenSSL (0.9.8 or above 1.0.0). It is recommended to use the most up-to-date OpenSSL version because of the recent security fixes.
If you want to get the lua-openssl and OpenSSL versions from a Lua script, here is how:
openssl = require "openssl"
lua_openssl_version, lua_version, openssl_version = openssl.version()Lua-Openssl is heavily updated, if you find bug, please report to here
#A. Howto
make
make install
make clean
Before building, please change the setting in the config.win file. Works with Lua5.1 (should support Lua5.2 by updating the config.win file).
nmake -f makefile.win
nmake -f makefile.win install
nmake -f makefile.win clean
make
make install
make clean
luarocks install openssl --server=https://rocks.moonscript.org/dev
Most lua-openssl function or methods return nil or false when error or failed, followed by string type error reason and number type error code, code can pass to openssl.error() to get more error information.
All SSL object IO operation methods return nil or false when fail or error. When nil returned, it followed by 'ssl' or 'syscall', means SSL layer or system layer error. When false returned, it followed by number 0, 'want_read', 'want_write','want_x509_lookup','want_connect','want_accept'. Numnber 0 means SSL connection closed, others means you should do some SSL operation.
Please remeber that when lua-openssl function or methods failed without error code, you can get last error by openssl.error(), and repeat call openssl.error() will walk through error stacks of current threads. openssl.error(true) will also clear error stacks after get last error code, this is very useful to free memory when lua-openssl repeat calls or run long times.
#B. Example usage
local evp_cipher = openssl.cipher.get('des')
m = 'abcdefghick'
key = m
cdata = evp_cipher:encrypt(m,key)
m1 = evp_cipher:decrypt(cdata,key)
assert(m==m1)md = openssl.digest.get('md5')
m = 'abcd'
aa = md:digest(m)
mdc=md:new()
mdc:update(m)
bb = mdc:final()
assert(openssl.hex(aa,true)==bb)n = #sk
for i=1, n do
x = sk:get(i)
endlocal openssl = require('openssl')
function dump(t,i)
for k,v in pairs(t) do
if(type(v)=='table') then
print( string.rep('\t',i),k..'={')
dump(v,i+1)
print( string.rep('\t',i),k..'=}')
else
print( string.rep('\t',i),k..'='..tostring(v))
end
end
end
function test_x509()
local x = openssl.x509.read(certasstring)
print(x)
t = x:parse()
dump(t,0)
print(t)
end
test_x509()###Example 5: bio network handle(TCP)
- server
local openssl = require'openssl'
local bio = openssl.bio
host = host or "127.0.0.1"; --only ip
port = port or "8383";
local srv = assert(bio.accept(host..':'..port))
print('listen at:'..port)
local cli = assert(srv:accept())
while 1 do
cli = assert(srv:accept())
print('CLI:',cli)
while cli do
local s = assert(cli:read())
print(s)
assert(cli:write(s))
end
print(openssl.error(true))
end- client
local openssl = require'openssl'
local bio = openssl.bio
io.read()
host = host or "127.0.0.1"; --only ip
port = port or "8383";
local cli = assert(bio.connect(host..':'..port,true))
while cli do
s = io.read()
if(#s>0) then
print(cli:write(s))
ss = cli:read()
assert(#s==#ss)
end
end
print(openssl.error(true))For more examples, please see test lua script file.
lua-openssl License
Copyright (c) 2011 - 2014 zhaozg, zhaozg(at)gmail.com
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
This product includes PHP software, freely available from http://www.php.net/software/