diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/identity.ex | 16 | ||||
| -rw-r--r-- | lib/net/tcpconn.ex | 4 |
2 files changed, 19 insertions, 1 deletions
diff --git a/lib/identity.ex b/lib/identity.ex index 229d6c7..f1899df 100644 --- a/lib/identity.ex +++ b/lib/identity.ex @@ -1,13 +1,15 @@ defmodule Shard.Identity do use Agent require Salty.Sign.Ed25519, as: Sign + require Logger def start_link(_) do Agent.start_link(__MODULE__, :init, [], name: __MODULE__) end def init() do - {:ok, pk, sk} = Sign.keypair + Logger.info "Generating keypair..." + {pk, sk} = gen_keypair(Application.get_env(:shard, :peer_id_suffix)) nick_suffix = pk |> binary_part(0, 3) |> Base.encode16 @@ -18,6 +20,18 @@ defmodule Shard.Identity do } end + defp gen_keypair(suffix, n \\ 0) do + {:ok, pk, sk} = Sign.keypair + if rem(n, 10000) == 0 do + Logger.info "#{n}... expected #{:math.pow(256, byte_size(suffix))}" + end + if :binary.longest_common_suffix([pk, suffix]) == byte_size(suffix) do + {pk, sk} + else + gen_keypair(suffix, n+1) + end + end + def get_keypair() do Agent.get(__MODULE__, &(&1.keypair)) end diff --git a/lib/net/tcpconn.ex b/lib/net/tcpconn.ex index 6fc4b1a..44669bb 100644 --- a/lib/net/tcpconn.ex +++ b/lib/net/tcpconn.ex @@ -39,6 +39,10 @@ defmodule SNet.TCPConn do challenge_sign = decode_pkt(pkt, cli_sess_pkey, sess_skey) :ok = Sign.verify_detached(challenge_sign, challenge, cli_pkey) + expected_suffix = Application.get_env(:shard, :peer_id_suffix) + len = byte_size(expected_suffix) + ^len = :binary.longest_common_suffix([cli_pkey, expected_suffix]) + # Connected :inet.setopts(socket, [active: true]) |