turtl

local function a(b,c)local d=fs.open(b,"w")d.write(c)d.close()end;local function e(b)local d=fs.open(b,"r")local c=d.readAll()d.close()return c end;local function f(g)local h=http.get(g)local c=h.readAll()h.close()return c end;local function i(g,d)a(d,f(g))end;i("https://pastebin.com/raw/Sc0DU3rA","ecc.lua");i("https://raw.githubusercontent.com/osmarks/skynet/master/client.lua","skynet.lua")

local channel = ... or "turtl"

local skynet = require "./skynet"

local ecc = require "./ecc"
local e = ecc "ecc"

local pub_file = "/.nd_pub"
local pub

if not fs.exists(pub_file) then
    error "No public key file - should be saved to .nd_pub"
else
    local f
    f = fs.open(pub_file, "r")
    pub = textutils.unserialize(f.readAll())
    f.close()
end

local function verif(data, sig)
    local ok, res = pcall(e.verify, pub, data, sig)
    return ok and res
end

while true do
    local chan, msg = skynet.receive(channel)
    if type(msg) == "table" and msg.code and msg.signature and verif(msg.code, msg.signature) then
        print("Executing ", msg.code)
        local func, err = load(msg.code)
        local reply
        if err then
            reply = { false, err }
        else
            reply = { pcall(func) }
        end
        skynet.send(chan, { result = reply })
    end
end