Module hash

Implementation code for pre-hashing our inputs.

We do this because we don’t actually want to record the entirety of each encrypted introduction request.

We aren’t terribly concerned about collision resistance: accidental collision don’t matter, since we are okay with a false-positive rate. Intentional collisions are also okay, since the only impact of generating one would be that you could make an introduce2 message of your own get rejected.

The impact of preimages is also not so bad. If somebody can reconstruct the original message, they still get an encrypted object, and need the KP_hss_ntor key to do anything with it. A second preimage attack just gives another message we won’t accept.

Functions

hash 🔒

Compute a hash from a given bytestring.