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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