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jamilbk/wg_genkey.ex

Last active June 23, 2022 04:42
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Generate WireGuard-compatible private key in Elixir
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wg_genkey.ex
defmodule Wg do
# Clamp random bytes for generating Curve25519 private key
# See https://github.com/tonarino/innernet/blob/main/wireguard-control/src/key.rs#L40
# or
# https://github.com/WireGuard/wireguard-tools/blob/master/src/curve25519.h#L18
def genkey do
bytes = :crypto.strong_rand_bytes(32)
<<head>> = binary_part(bytes, 0, 1)
<<tail>> = binary_part(bytes, 31, 1)
clamped_head = head &&& 248
clamped_tail = (tail &&& 127) ||| 64
<<clamped_head>> <> binary_part(bytes, 1, 30) <> <<clamped_tail>>
end
end
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