SHA256 hash with luup

Developer's Corner General Dev Discussions
1

Is there any way to create a sha256 hash inside my luup code? I need this to call a webservice that requires an SHA256 authentication string.

2

Maybe borrow this code: lua-users wiki: Secure Hash Algorithm

3

You can also use OpenSSL on the Vera:

 function Hash(hsh)
   local res
   local f = io.popen("echo -n '" .. hsh .. "'  | openssl dgst -binary | openssl base64")
   if (f) then
      res = f:lines()()
      f:close()
   end
   return res
end

You may have to adjust the openssl arguments to get the hash function you want …

4

Or this [url=http://rosettacode.org/wiki/SHA-256#Lua]http://rosettacode.org/wiki/SHA-256#Lua[/url] ?

5

I do not thing Vera has the crypto LUA modules available.

6

My mistake… I do all my plugin development and daily use on non-Vera hardware (running openLuup) which makes it much easier to plug in this sort of thing.

7

The openssl seems like a smart move. I will give that a try.Thanks.

8

I thought the luasec library (https://github.com/brunoos/luasec/wiki) which seems to be included with Vera was a wrapper for OpenSSL?

You should be able to use this simply with

local ssl = require "ssl"

How, or whether, you can select SHA256, I don’t know.