Sindbad~EG File Manager

--[[
O2switch wrapper/interface for some hashing function
--]]

local _M = {}

local str = require "resty.string"
local tostring = tostring
local type = type 

local resty_sha256 = require "resty.sha256"
local sha256 = resty_sha256:new()
local resty_sha1 = require "resty.sha1"
local sha1 = resty_sha1:new()
local md5 = ngx.md5 -- We use the Nginx md5, probably more performant

-- Return a SHA256 hash. Value are cast to string
-- @return data|nil, errorMsg|nil
function _M.sha256(s)
    if(type(s) ~= 'string') then
        s = tostring(s)
    end
    sha256:reset()
    if sha256:update(s) then
        local digest = sha256:final()
        return str.to_hex(digest), nil
    end
    return nil, "sha256: Error, cant retrieve a hash"
end

-- Return a md5 hash. Value are cast to string
-- @return data|nil, errorMsg|nil
function _M.md5(s)
    if(type(s) ~= 'string') then
        s = tostring(s)
    end
    return md5(s), nil
end

-- Return a sha1 hash. Value are cast to string
-- @return data|nil, errorMsg|nil
function _M.sha1(s)
    if(type(s) ~= 'string') then
        s = tostring(s)
    end
    sha1:reset()
    if sha1:update(s) then
        local digest = sha1:final()
        return str.to_hex(digest), nil
    end
    return nil, "sha1: Error, cant retrieve a hash"
end

return _M