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As a way to roll back the genericity, implement an extension trait of group for password-to-curve hashing,

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This supersedes #18.

Co-authored-by: KevinLewi <[email protected]>
This commit is contained in:
François Garillot
2020-07-03 21:05:18 -04:00
co-authored by KevinLewi
parent 41cd80ccb5
commit 9d40aa7659
9 changed files with 46 additions and 70 deletions
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src/ciphersuite.rs
+7 -9
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@@ -7,24 +7,22 @@
use crate::{
errors::InternalPakeError,
group::Group,
keypair::{Key, KeyPair},
oprf::HkdfDigest,
map_to_curve::GroupWithMapToCurve,
slow_hash::SlowHash,
};
use digest::FixedOutput;
use generic_array::typenum::{U32};
use rand_core::{CryptoRng, RngCore};
/// Configures the underlying primitives used in OPAQUE
/// * `Digest`: a digest suitable for use in an Hkdf, with an output length equal
/// to the input of the hash-to-curve function of the `Group` parameter.
/// * `Group`: a finite cyclic group along with a point representation
/// * `Group`: a finite cyclic group along with a point representation, along
/// with an extension trait PasswordToCurve that allows some customization on
/// how to hash a password to a curve point. See `group::Group` and
/// `map_to_curve::GroupWithMapToCurve`.
/// * `KeyFormat`: a keypair type composed of public and private components
/// * `SlowHash`: a slow hashing function, typically used for password hashing
pub trait CipherSuite {
type Digest: HkdfDigest;
type Group: Group<ScalarLen = U32, UniformBytesLen = <Self::Digest as FixedOutput>::OutputSize>;
type Group: GroupWithMapToCurve;
type KeyFormat: KeyPair<Repr = Key> + PartialEq;
type SlowHash: SlowHash;