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digest_hasher.rs
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digest_hasher.rs
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// Copyright 2023 The Turbo Cache Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use blake3::Hasher as Blake3Hasher;
use sha2::{Digest, Sha256};
use common::DigestInfo;
/// Supported digest hash functions.
pub enum DigestHasherFunc {
Sha256,
Blake3,
}
impl From<DigestHasherFunc> for DigestHasher {
fn from(value: DigestHasherFunc) -> Self {
match value {
DigestHasherFunc::Sha256 => DigestHasher::Sha256(Sha256::new()),
DigestHasherFunc::Blake3 => DigestHasher::Blake3(Box::new(Blake3Hasher::new())),
}
}
}
/// The individual implementation of the hash function.
pub enum DigestHasher {
Sha256(Sha256),
Blake3(Box<Blake3Hasher>),
}
impl DigestHasher {
/// Update the hasher with some additional data.
#[inline]
pub fn update(&mut self, input: &[u8]) {
match self {
DigestHasher::Sha256(h) => sha2::digest::Update::update(h, input),
DigestHasher::Blake3(h) => {
Blake3Hasher::update(h, input);
}
}
}
/// Finalize the hash function and collect the results into a digest.
#[inline]
pub fn finalize_digest(&mut self, size: impl Into<i64>) -> DigestInfo {
let hash = match self {
DigestHasher::Sha256(h) => h.finalize_reset().into(),
DigestHasher::Blake3(h) => h.finalize().into(),
};
DigestInfo::new(hash, size.into())
}
}