hashing.rs 1.97 KB
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// Copyright 2019-2020 Parity Technologies (UK) Ltd.
//
// 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.

//! Implementations of supported cryptographic hash functions.

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/// Helper routine implementing variable size BLAKE2b hash computation.
fn blake2b_var(size: usize, input: &[u8], output: &mut [u8]) {
    use blake2::digest::VariableOutput as _;
    use std::io::Write as _;
    let mut blake2 = blake2::VarBlake2b::new_keyed(&[], size);
    blake2
        .write_all(input)
        .expect("failed to compute BLAKE2b hash of input");
    output.copy_from_slice(blake2.vec_result().as_slice());
}

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/// Conduct the BLAKE2 256-bit hash and place the result into `output`.
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pub fn blake2b_256(input: &[u8], output: &mut [u8; 32]) {
    blake2b_var(32, input, output)
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}

/// Conduct the BLAKE2 128-bit hash and place the result into `output`.
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pub fn blake2b_128(input: &[u8], output: &mut [u8; 16]) {
    blake2b_var(16, input, output)
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}

/// Conduct the KECCAK 256-bit hash and place the result into `output`.
pub fn keccak_256(input: &[u8], output: &mut [u8; 32]) {
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    use ::sha2::Digest as _;
    let mut hasher = ::sha3::Keccak256::new();
    hasher.input(input);
    output.copy_from_slice(hasher.result().as_slice());
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}

/// Conduct the SHA2 256-bit hash and place the result into `output`.
pub fn sha2_256(input: &[u8], output: &mut [u8; 32]) {
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    use ::sha2::Digest as _;
    let mut hasher = ::sha2::Sha256::new();
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    hasher.input(input);
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    output.copy_from_slice(hasher.result().as_slice());
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}