Lua-openssl - all openssl submodules are nil - lua

Question

I'm trying to follow the instructions from the readme file here: https://github.com/zhaozg/lua-openssl
This is a basic program I'm running:
openssl = require 'openssl'
inspect = require 'inspect'
print(inspect(openssl.cipher))
Only 'nil' gets printed to the terminal.
If I try to inspect the "openssl" object, I get the following output:
{
NO_IDEA = true,
NO_MD2 = true,
NO_MDC2 = true,
NO_RC5 = true,
NO_SCTP = true,
SHLIB_VERSION_HISTORY = "",
SHLIB_VERSION_NUMBER = "1.1",
SSLEAY_BUILT_ON = 2,
SSLEAY_CFLAGS = 1,
SSLEAY_DIR = 4,
SSLEAY_PLATFORM = 3,
SSLEAY_VERSION = 0,
SSLEAY_VERSION_NUMBER = 269484159,
VERSION_NUMBER = 269484159,
VERSION_TEXT = "OpenSSL 1.1.0g 2 Nov 2017",
version = <function 1>
}
Any ideas? What am I doing wrong?

Answer 1

The version that comes with your system may not have yet the cipher module, or may be another binding for openssl.
Check the modules that your version has in the folder where lua openssl is located, in my system is in /usr/local/share/lua/5.1/openssl/, there is also a file outside the folder /usr/local/share/lua/5.1/openssl.lua and the shared object in /usr/local/lib/lua/5.1/_openssl.so but in yours it may vary.
Backup those files to another place just to make sure. Remove them and install the latest version with luarocks.
luarocks install openssl
Luarocks will probably install the new shared object in /usr/local/lib/lua/5.1/. If the name of the module installed has the version in the name like openssl_0_7_7_0-openssl.so rename it to openssl.so.