#{mode := client, host := Host, port := Port, keys := KeyFile} ->

        #{mode := client, host := Host, port := Port, keys := KeyFile, server_pk := ServerPK} ->

            {server_pk, ServerPK} = read_server_public(KeyFile),

            ServerPK = hex_binary(ServerPK),

    {ClientSK, ClientPK} = enoise_crypto:dh_keypair(dh25519),
    % Generate server keypair
    {ServerSK, ServerPK} = enoise_crypto:dh_keypair(dh25519),

    {kp, dh25519, Secret, Public} = enoise_keypair:new(dh25519),

    ClientSKHex = bin_to_hex(ClientSK),
    ClientPKHex = bin_to_hex(ClientPK),
    ServerSKHex = bin_to_hex(ServerSK),
    ServerPKHex = bin_to_hex(ServerPK),

    SKHex = bin_to_hex(Secret),
    PKHex = bin_to_hex(Public),

        "%% Client keypair~n"

        "}}.~n"
        "~n"
        "%% Server's public key (for client verification)~n"
        "{server_pk, \"~s\"}.~n"
        "~n"
        "%% Server keypair (server side)~n"
        "{server_keys, #{~n"
        "    priv => \"~s\",~n"
        "    pub => \"~s\"~n"

        [ClientSKHex, ClientPKHex, ServerPKHex, ServerSKHex, ServerPKHex]

       [SKHex, PKHex]

bin_to_hex(Bin) ->
    lists:flatten([io_lib:format("~2.16.0B", [X]) || X <- binary_to_list(Bin)]).

    end.
read_server_public(File) ->
    case file:consult(File) of
        {ok, Terms} ->
            case lists:keyfind(server_pk, 1, Terms) of
                {server_pk, SPK} -> {server_pk, hex(SPK)};
                false -> error(no_server_pk)
            end;
        {error, _} = Err -> Err

bin_to_hex(Bin) ->
    lists:flatten([io_lib:format("~2.16.0B", [X]) || X <- binary_to_list(Bin)]).

parse_args(["-mode", "keygen" | Rest], Acc) ->
    parse_args(Rest, Acc#{mode => keygen});

parse_args(["-server-pk", PubKey | Rest], Acc) ->
    parse_args(Rest, Acc#{server_pk => PubKey});

    io:format("  -mode client|server~n"),

    io:format("  -mode keygen|client|server~n"),

    io:format("  rebar3 run -- -mode client -host localhost -port 7891 -keys keys.txt~n").

    io:format("  rebar3 run -- -mode client -host localhost -port 7891 -keys keys.txt -sever-pk hexstring~n").