1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71
// Copyright 2018-2021 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. //! Provides type definitions and traits for the built-in cryptographic hashes. /// The output type of a built-in cryptographic hash function. pub trait HashOutput: private::Sealed { /// The output type of the crypto hash. /// /// This should be a byte array with some constant size such as `[u8; 32]`. type Type: Default; } /// Types that are usable as built-in cryptographic hashes. pub trait CryptoHash: HashOutput + private::Sealed { /// Hashes the given raw byte input and copies the result into `output`. fn hash(input: &[u8], output: &mut <Self as HashOutput>::Type); } /// The SHA2 crypto hash with 256-bit output. #[derive(Debug, Copy, Clone, PartialEq, Eq)] pub enum Sha2x256 {} /// The KECCAK crypto hash with 256-bit output. #[derive(Debug, Copy, Clone, PartialEq, Eq)] pub enum Keccak256 {} /// The BLAKE2 crypto hash with 256-bit output. #[derive(Debug, Copy, Clone, PartialEq, Eq)] pub enum Blake2x256 {} /// The BLAKE2 crypto hash with 128-bit output. #[derive(Debug, Copy, Clone, PartialEq, Eq)] pub enum Blake2x128 {} mod private { /// Seals the implementation of `CryptoHash` and `HashOutput`. pub trait Sealed {} } impl private::Sealed for Sha2x256 {} impl private::Sealed for Keccak256 {} impl private::Sealed for Blake2x256 {} impl private::Sealed for Blake2x128 {} impl HashOutput for Sha2x256 { type Type = [u8; 32]; } impl HashOutput for Keccak256 { type Type = [u8; 32]; } impl HashOutput for Blake2x256 { type Type = [u8; 32]; } impl HashOutput for Blake2x128 { type Type = [u8; 16]; }