The audit recommends checking failure cases for from_bytes,
from_bytes_unechecked, and from_repr. This isn't feasible.
from_bytes is allowed to have non-canonical values. [0xff; 32] may accordingly
be a valid point for non-SEC1-encoded curves.
from_bytes_unchecked doesn't have a defined failure mode, and by name,
unchecked, shouldn't necessarily fail. The audit acknowledges the tests should
test for whatever result is 'appropriate', yet any result which isn't a failure
on a valid element is appropriate.
from_repr must be canonical, yet for a binary field of 2^n where n % 8 == 0, a
[0xff; n / 8] repr would be valid.
* Add dkg crate
* Remove F_len and G_len
They're generally no longer used.
* Replace hash_to_vec with a provided method around associated type H: Digest
Part of trying to minimize this trait so it can be moved elsewhere. Vec,
which isn't std, may have been a blocker.
* Encrypt secret shares within the FROST library
Reduces requirements on callers in order to be correct.
* Update usage of Zeroize within FROST
* Inline functions in key_gen
There was no reason to have them separated as they were. sign probably
has the same statement available, yet that isn't the focus right now.
* Add a ciphersuite package which provides hash_to_F
* Set the Ciphersuite version to something valid
* Have ed448 export Scalar/FieldElement/Point at the top level
* Move FROST over to Ciphersuite
* Correct usage of ff in ciphersuite
* Correct documentation handling
* Move Schnorr signatures to their own crate
* Remove unused feature from schnorr
* Fix Schnorr tests
* Split DKG into a separate crate
* Add serialize to Commitments and SecretShare
Helper for buf = vec![]; .write(buf).unwrap(); buf
* Move FROST over to the new dkg crate
* Update Monero lib to latest FROST
* Correct ethereum's usage of features
* Add serialize to GeneratorProof
* Add serialize helper function to FROST
* Rename AddendumSerialize to WriteAddendum
* Update processor
* Slight fix to processor
* Label the version as an alpha
* Add versions to Cargo.tomls
* Update to Zeroize 1.5
* Drop patch versions from monero-serai Cargo.toml
* Add a repository field
* Move generators to OUT_DIR
IIRC, I didn't do this originally as it constantly re-generated them.
Unfortunately, since cargo is complaining about .generators, we have to.
* Remove Timelock::fee_weight
Transaction::fee_weight's has a comment, "Assumes Timelock::None since
this library won't let you create a TX with a timelock". Accordingly,
this is dead code.
While Group::random shouldn't be used instead of a hash to curve, anyone
who did would've previously been insecure and now isn't.
Could've done a recover_x and a raw Point construction, followed by a
cofactor mul, to avoid the serialization, yet the serialization ensures
full validity under the standard from_bytes function. THis also doesn't
need to be micro-optimized.
* Theoretical ed448 impl
* Fixes
* Basic tests
* More efficient scalarmul
Precomputes a table to minimize additions required.
* Add a torsion test
* Split into a constant and variable time backend
The variable time one is still far too slow, at 53s for the tests (~5s a
scalarmul). It should be usable as a PoC though.
* Rename unsafe Ed448
It's not only unworthy of the Serai branding and deserves more clarity
in the name.
* Add wide reduction to ed448
* Add Zeroize to Ed448
* Rename Ed448 group.rs to point.rs
* Minor lint to FROST
* Ed448 ciphersuite with 8032 test vector
* Macro out the backend fields
* Slight efficiency improvement to point decompression
* Disable the multiexp test in FROST for Ed448
* fmt + clippy ed448
* Fix an infinite loop in the constant time ed448 backend
* Add b"chal" to the 8032 context string for Ed448
Successfully tests against proposed vectors for the FROST IETF draft.
* Fix fmt and clippy
* Use a tabled pow algorithm in ed448's const backend
* Slight tweaks to variable time backend
Stop from_repr(MODULUS) from passing.
* Use extended points
Almost two orders of magnitude faster.
* Efficient ed448 doubling
* Remove the variable time backend
With the recent performance improvements, the constant time backend is
now 4x faster than the variable time backend was. While the variable
time backend remains much faster, and the constant time backend is still
slow compared to other libraries, it's sufficiently performant now.
The FROST test, which runs a series of multiexps over the curve, does
take 218.26s while Ristretto takes 1 and secp256k1 takes 4.57s.
While 50x slower than secp256k1 is horrible, it's ~1.5 orders of
magntiude, which is close enough to the desire stated in
https://github.com/serai-dex/serai/issues/108 to meet it.
Largely makes this library safe to use.
* Correct constants in ed448
* Rename unsafe-ed448 to minimal-ed448
Enables all FROST tests against it.
* No longer require the hazmat feature to use ed448
* Remove extraneous as_refs
