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Sealed trait to make (De|En)capsulationKeys more usable #81

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Sealed trait to make (De|En)capsulationKeys more usable #81

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15 changes: 10 additions & 5 deletions ml-kem/src/kem.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -18,12 +18,17 @@ pub use ::kem::{Decapsulate, Encapsulate};
/// A shared key resulting from an ML-KEM transaction
pub(crate) type SharedKey = B32;

/// Derived parameters relevant to ML-KEM
pub trait Params: KemParams {}

impl<K: KemParams> Params for K {}

/// A `DecapsulationKey` provides the ability to generate a new key pair, and decapsulate an
/// encapsulated shared key.
#[derive(Clone, Debug, PartialEq)]
pub struct DecapsulationKey<P>
where
P: KemParams,
P: Params,
{
dk_pke: DecryptionKey<P>,
ek: EncapsulationKey<P>,
Expand Down Expand Up @@ -147,7 +152,7 @@ where
#[derive(Clone, Debug, PartialEq)]
pub struct EncapsulationKey<P>
where
P: KemParams,
P: Params,
{
ek_pke: EncryptionKey<P>,
h: B32,
Expand Down Expand Up @@ -218,7 +223,7 @@ where
/// together all of the other related types and sizes.
pub struct Kem<P>
where
P: KemParams,
P: Params,
{
_phantom: PhantomData<P>,
}
Expand Down Expand Up @@ -258,7 +263,7 @@ mod test {

fn round_trip_test<P>()
where
P: KemParams,
P: Params,
{
let mut rng = rand::thread_rng();

Expand All @@ -279,7 +284,7 @@ mod test {

fn codec_test<P>()
where
P: KemParams,
P: Params,
{
let mut rng = rand::thread_rng();
let dk_original = DecapsulationKey::<P>::generate(&mut rng);
Expand Down