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| author | Jason A. Donenfeld <Jason@zx2c4.com> | 2016-07-11 03:15:00 +0200 |
|---|---|---|
| committer | Jason A. Donenfeld <Jason@zx2c4.com> | 2016-07-22 15:17:15 +0200 |
| commit | 82831962b88b03ac4ced09e62e2822dfe482bb5b (patch) | |
| tree | 978f695812a24860f4206893ecad1e6e0cafc24e | |
| parent | 8ac1ced115caea70719a29bb9fb2f6f04b324b76 (diff) | |
cookie: do not expose csprng directly
It may not be wise to directly publish the output of the CSPRNG, so we
run the output through a round of Blake2s first.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
| -rw-r--r-- | src/cookie.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/cookie.c b/src/cookie.c index f02a7e8..0409b56 100644 --- a/src/cookie.c +++ b/src/cookie.c @@ -164,6 +164,7 @@ void cookie_message_create(struct message_handshake_cookie *dst, struct sk_buff dst->header.type = MESSAGE_HANDSHAKE_COOKIE; dst->receiver_index = index; get_random_bytes(dst->salt, COOKIE_SALT_LEN); + blake2s(dst->salt, dst->salt, NULL, COOKIE_SALT_LEN, COOKIE_SALT_LEN, 0); /* Avoid directly transmitting RNG output. */ down_read(&checker->device->static_identity.lock); if (unlikely(!checker->device->static_identity.has_identity)) { |