49 lines
1.5 KiB
Rust
49 lines
1.5 KiB
Rust
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// Copyright (c) Facebook, Inc. and its affiliates.
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//
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// This source code is licensed under both the MIT license found in the
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// LICENSE-MIT file in the root directory of this source tree and the Apache
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// License, Version 2.0 found in the LICENSE-APACHE file in the root directory
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// of this source tree.
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//! Defines the CipherSuite trait to specify the underlying primitives for VOPRF
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use digest::core_api::BlockSizeUser;
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use digest::{Digest, OutputSizeUser};
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use elliptic_curve::VoprfParameters;
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use generic_array::typenum::{IsLess, IsLessOrEqual, U256};
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use crate::Group;
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/// Configures the underlying primitives used in VOPRF
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pub trait CipherSuite
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where
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<Self::Hash as OutputSizeUser>::OutputSize:
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IsLess<U256> + IsLessOrEqual<<Self::Hash as BlockSizeUser>::BlockSize>,
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{
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/// The ciphersuite identifier as dictated by
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/// <https://www.ietf.org/archive/id/draft-irtf-cfrg-voprf-08.html>
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const ID: u16;
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/// A finite cyclic group along with a point representation that allows some
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/// customization on how to hash an input to a curve point. See [`Group`].
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type Group: Group;
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/// The main hash function to use (for HKDF computations and hashing
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/// transcripts).
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type Hash: BlockSizeUser + Digest;
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}
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impl<T: VoprfParameters> CipherSuite for T
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where
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T: Group,
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T::Hash: BlockSizeUser + Digest,
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<T::Hash as OutputSizeUser>::OutputSize:
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IsLess<U256> + IsLessOrEqual<<T::Hash as BlockSizeUser>::BlockSize>,
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{
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const ID: u16 = T::ID;
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type Group = T;
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type Hash = T::Hash;
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}
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