44 lines
1.3 KiB
Rust
44 lines
1.3 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::InternalPakeError;
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use crate::hash::Hash;
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use digest::Digest;
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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> {
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/// Computes the slow hashing function
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fn hash(
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input: GenericArray<u8, <D as Digest>::OutputSize>,
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) -> Result<Vec<u8>, InternalPakeError>;
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}
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/// A no-op hash which simply returns its input
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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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input: GenericArray<u8, <D as Digest>::OutputSize>,
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) -> Result<Vec<u8>, InternalPakeError> {
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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 scrypt::ScryptParams {
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fn hash(
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input: GenericArray<u8, <D as Digest>::OutputSize>,
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) -> Result<Vec<u8>, InternalPakeError> {
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let params = scrypt::ScryptParams::new(15, 8, 1).unwrap();
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let mut output = [0u8; <D as Digest>::OutputSize::to_usize()];
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scrypt::scrypt(&input, &[], ¶ms, &mut output)
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.map_err(|_| InternalPakeError::SlowHashError)?;
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Ok(output.to_vec())
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}
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}
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