34 lines
1.2 KiB
Rust
34 lines
1.2 KiB
Rust
// Copyright (c) Facebook, Inc. and its affiliates.
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//
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// This source code is licensed under the MIT license found in the
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// LICENSE file in the root directory of this source tree.
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//! Defines the GroupWithMapToCurve trait to specify how to map a password to a
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//! curve point
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use crate::group::Group;
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use curve25519_dalek::{edwards::EdwardsPoint, ristretto::RistrettoPoint};
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use hkdf::Hkdf;
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use sha2::{Sha256, Sha512};
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/// A subtrait of Group specifying how to hash a password into a point
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pub trait GroupWithMapToCurve: Group {
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/// transforms a password and optional pepper into a curve point
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fn map_to_curve(password: &[u8], pepper: Option<&[u8]>) -> Self;
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}
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impl GroupWithMapToCurve for RistrettoPoint {
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fn map_to_curve(password: &[u8], pepper: Option<&[u8]>) -> Self {
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let (hashed_input, _) = Hkdf::<Sha512>::extract(pepper, password);
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<Self as Group>::hash_to_curve(&hashed_input)
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}
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}
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impl GroupWithMapToCurve for EdwardsPoint {
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fn map_to_curve(password: &[u8], pepper: Option<&[u8]>) -> Self {
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let (hashed_input, _) = Hkdf::<Sha256>::extract(pepper, password);
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<Self as Group>::hash_to_curve(&hashed_input)
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}
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}
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