ml-kem/module-lattice: add traits for NTT operations#211
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Adds `MultiplyNtt` to `module-lattice`, and `Ntt` and `NttInverse` to `ml-kem`. Previously `module-lattice` defined the `Mul` impl on `NttPolynomial` in terms of Algorithm 45 from FIPS 204, and this is used by the `Mul` impls on `NttVector` and `NttMatrix` as well. For ML-KEM we instead need to plug in Algorithm 11 from FIPS 203 (MultiplyNTTs), so we need a trait that lets each crate define the `Mul` impl on `NttPolynomial`. This adds a `MultiplyNtt` trait to `module-lattice`, currently defined on a `Field` (perhaps not great but it's the generic parameter we have), which allows each construction to plug in their own NTT multiplication algorithm. The existing implementation of Algorithm 45 from FIPS 204 will need to move to the `ml-dsa` crate. Also, following the structure of the `ml-dsa` crate, this defines two same-shaped traits, `Ntt` and `NttInverse`, that can be impl'd on types from `module-lattice` to use the same method syntax that was being used previously before #210. Unfortunately we can't share traits with `ml-dsa`, because the only way we can impl these traits for types from `module-lattice` is if we define them. But they're small and there aren't that many of them.
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## Added - `Seed` support e.g. `DecapsulationKey::from_seed` (#133, #138) - PKCS#8 support (#135) - `KeyInit`, `KeySizeUser`, and `KeyExport` impls for decapsulation keys (#156, #228) - Parameter set modules: `ml_kem_512`, `mk_kem_768`, `mk_kem_1024` (#162) - `DecapsulationKey::from_expanded` deprecated compatibility support (#163) - `TryKeyInit` and `KeyExport` impls for encapsulation keys (#188) - Validations against Wycheproof test vectors (#213, #214, #215, #217) - Implement `kem::Kem` trait (#223) - Support for `kem::FromSeed` trait (#255) ## Changed - Edition changed to 2024 and MSRV bumped to 1.85 (#118) - Relax MSRV policy and allow MSRV bumps in patch releases - Upgrade `hybrid-array` dependency to 0.4 (#129) - Extract `module-lattice` crate (#199, #202, #204, #209, #210, #211, #212, #218, #219, #220) - Replace `EncodedSizeUser` with `ExpandedKeyEncoding` (#226) - Bump `getrandom` to v0.4 (#245) - Bump `rand_core` to v0.10 (#245) - Migrate from `subtle` to `ctutils` (#277) - Bump `sha3` dependency to v0.11 (#282) - Bump `kem` dependency to v0.3 (#283) - Bump `pkcs8` dependency to v0.11 (#291) ## Fixed - Validate encryption/encapsulation keys (#179) - Validate expanded decapsulation key hash (#207) ## Removed - `Kem` struct and `KemCore` trait - replaced by `kem::Kem` (#223)
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Adds
MultiplyNtttomodule-lattice, andNttandNttInversetoml-kem.Previously
module-latticedefined theMulimpl onNttPolynomialin terms of Algorithm 45 from FIPS 204, and this is used by theMulimpls onNttVectorandNttMatrixas well.For ML-KEM we instead need to plug in Algorithm 11 from FIPS 203 (MultiplyNTTs), so we need a trait that lets each crate define the
Mulimpl onNttPolynomial.This adds a
MultiplyNtttrait tomodule-lattice, currently defined on aField(perhaps not great but it's the generic parameter we have), which allows each construction to plug in their own NTT multiplication algorithm.The existing implementation of Algorithm 45 from FIPS 204 will need to move to the
ml-dsacrate.Also, following the structure of the
ml-dsacrate, this defines two same-shaped traits,NttandNttInverse, that can be impl'd on types frommodule-latticeto use the same method syntax that was being used previously before #210.Unfortunately we can't share traits with
ml-dsa, because the only way we can impl these traits for types frommodule-latticeis if we define them. But they're small and there aren't that many of them.