daxpeddaandKevin Lewi
d1dfee9a65
* Add `SlowHash` configuration * Use a reference * Changing generic argument to be CipherSuite instead of SlowHash Co-authored-by: Kevin Lewi <[email protected]>
49 lines
1.4 KiB
Rust
49 lines
1.4 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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//! Trait specifying a slow hashing function
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use crate::{errors::InternalError, hash::Hash};
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use alloc::vec::Vec;
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use digest::Digest;
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#[cfg(feature = "slow-hash")]
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use generic_array::typenum::Unsigned;
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use generic_array::GenericArray;
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/// Used for the slow hashing function in OPAQUE
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pub trait SlowHash<D: Hash>: Default {
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/// Computes the slow hashing function
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fn hash(
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&self,
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input: GenericArray<u8, <D as Digest>::OutputSize>,
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) -> Result<Vec<u8>, InternalError>;
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}
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/// A no-op hash which simply returns its input
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#[derive(Default)]
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pub struct NoOpHash;
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impl<D: Hash> SlowHash<D> for NoOpHash {
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fn hash(
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&self,
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input: GenericArray<u8, <D as Digest>::OutputSize>,
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) -> Result<Vec<u8>, InternalError> {
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Ok(input.to_vec())
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}
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}
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#[cfg(feature = "slow-hash")]
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impl<D: Hash> SlowHash<D> for argon2::Argon2<'_> {
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fn hash(
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&self,
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input: GenericArray<u8, <D as Digest>::OutputSize>,
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) -> Result<Vec<u8>, InternalError> {
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let mut output = alloc::vec![0u8; <D as Digest>::OutputSize::USIZE];
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self.hash_password_into(&input, &[0; argon2::MIN_SALT_LEN], &mut output)
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.map_err(|_| InternalError::SlowHashError)?;
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Ok(output)
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}
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}
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