mirror of
https://github.com/osmarks/random-stuff
synced 2024-11-08 13:39:53 +00:00
38 lines
1.1 KiB
Lua
38 lines
1.1 KiB
Lua
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local modem = peripheral.find("modem", function(_, o)
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return o.maxPacketSize ~= nil
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end)
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local sha256 = require "/sha256"
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local psk = settings.get "psk"
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local function tohex(t)
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local out = {}
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for _, val in pairs(t) do
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table.insert(out, ("%02x"):format(val))
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end
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return table.concat(out)
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end
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modem.open(46111)
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while true do
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local input = read()
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local target = ""
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local nonce = {}
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for i = 1, 16 do
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table.insert(nonce, math.random(0, 255))
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end
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nonce = tohex(nonce)
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modem.transmit(46110, 46110, input, tohex(sha256.digest(input .. psk .. target .. nonce)), target, nonce)
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local ev = {os.pullEvent "modem_message"}
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if #ev == 8 then
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local response, signature, device, nonce = ev[5], ev[6], ev[7], ev[8]
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if tohex(sha256.digest(response .. psk .. device .. nonce)) == signature then
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local ok, err = unpack(textutils.unserialise(response))
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if ok then
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print(err)
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else
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printError(err)
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end
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print(device)
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end
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end
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end
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