From: Hristo Georgiev <hristo.metal@gmail.com>
To: wireguard@lists.zx2c4.com
Subject: Nonce in out-of-order messages
Date: Wed, 24 Jul 2019 13:05:58 +0300 [thread overview]
Message-ID: <E6BE60A6-0A9F-4A45-9FCE-155410ECDC6F@gmail.com> (raw)
Hello
I’m working on file transfer protocol inspired by Noise and Wireguard over UDP with static keys so the handshake pattern is going to be Noise_IK_25519_ChaChaPoly_BLAKE2s or KK. In general i’m trying to follow NoiseSocket spec but adapted to UDP and i was wondering where to place the ‘nonce’ into packet to extend the protocol as described into p.11.4 in NoiseProtocol spec http://www.noiseprotocol.org/noise.html#out-of-order-transport-messages . So I had a look into WireGuard implementation (which I use a lot in multiple sites, mostly on EdgeRouters)
so what i found in noise.c line 445 message_decrypt:
chacha20poly1305_decrypt(dst_plaintext, src_ciphertext, src_len,
hash, NOISE_HASH_LEN,
0 /* Always zero for Noise_IK */, key))
Correct me if I’m mistaken, I’m not C programer nor cryptographer, I think this zero here is the Nonce. If that’s the case what security sacrifices and the chance for replay attacks are?
Would it be Ok if I also hardcode the Nonce to 0 in my implementation?
Thank you,
Hristo
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next reply other threads:[~2019-08-25 15:37 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-24 10:05 Hristo Georgiev [this message]
2019-08-25 15:56 ` Nonce in out-of-order messages Jason A. Donenfeld
2019-09-01 8:10 ` Hristo Georgiev
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