├── .github └── workflows │ ├── release.yml │ └── test-suite.yml ├── .gitignore ├── Cargo.toml ├── LICENSE ├── README.md └── src ├── lib.rs └── sha2_impl.rs /.github/workflows/release.yml: -------------------------------------------------------------------------------- 1 | name: release 2 | on: 3 | push: 4 | tags: 5 | - v* 6 | jobs: 7 | check-version: 8 | runs-on: ubuntu-latest 9 | steps: 10 | - uses: actions/checkout@v3 11 | - name: Check version 12 | run: | 13 | TAG_VERSION=$(echo ${GITHUB_REF#refs/tags/v}) 14 | CRATE_VERSION=$(cargo metadata --no-deps --format-version 1 | jq -r '.packages[0].version') 15 | test "$TAG_VERSION" = "$CRATE_VERSION" 16 | publish: 17 | runs-on: ubuntu-latest 18 | needs: check-version 19 | env: 20 | CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }} 21 | steps: 22 | - uses: actions/checkout@v3 23 | - name: Publish 24 | run: cargo publish 25 | -------------------------------------------------------------------------------- /.github/workflows/test-suite.yml: -------------------------------------------------------------------------------- 1 | name: test-suite 2 | 3 | on: 4 | push: 5 | branches: 6 | - main 7 | - 'pr/*' 8 | pull_request: 9 | env: 10 | # Deny warnings in CI 11 | RUSTFLAGS: "-D warnings" 12 | jobs: 13 | cargo-fmt: 14 | name: cargo-fmt 15 | runs-on: ubuntu-latest 16 | steps: 17 | - uses: actions/checkout@v3 18 | - name: Get latest version of stable Rust 19 | run: rustup update stable 20 | - name: Check formatting with cargo fmt 21 | run: cargo fmt --all -- --check 22 | test: 23 | strategy: 24 | matrix: 25 | os: [ubuntu-latest, macos-latest, windows-latest] 26 | runs-on: ${{ matrix.os }} 27 | name: test-${{ matrix.os }} 28 | steps: 29 | - uses: actions/checkout@v3 30 | - name: Get latest version of stable Rust 31 | run: rustup update stable 32 | - name: Run tests 33 | run: cargo test --release 34 | coverage: 35 | runs-on: ubuntu-latest 36 | name: cargo-tarpaulin 37 | steps: 38 | - uses: actions/checkout@v3 39 | - name: Get latest version of stable Rust 40 | run: rustup update stable 41 | - name: Install cargo-tarpaulin 42 | uses: taiki-e/install-action@cargo-tarpaulin 43 | - name: Check code coverage with cargo-tarpaulin 44 | run: cargo-tarpaulin --workspace --all-features --out xml 45 | - name: Upload to codecov.io 46 | uses: codecov/codecov-action@v3 47 | with: 48 | fail_ci_if_error: true 49 | token: ${{ secrets.CODECOV_TOKEN }} 50 | informational: true 51 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | Cargo.lock 2 | /target 3 | -------------------------------------------------------------------------------- /Cargo.toml: -------------------------------------------------------------------------------- 1 | [package] 2 | name = "ethereum_hashing" 3 | version = "0.7.0" 4 | edition = "2021" 5 | license = "Apache-2.0" 6 | readme = "README.md" 7 | description = "Hashing primitives used in Ethereum" 8 | repository = "https://github.com/sigp/ethereum_hashing" 9 | documentation = "https://docs.rs/ethereum_hashing" 10 | keywords = ["ethereum"] 11 | categories = ["cryptography::cryptocurrencies"] 12 | rust-version = "1.80.0" 13 | 14 | [dependencies] 15 | ring = "0.17" 16 | 17 | [target.'cfg(target_arch = "x86_64")'.dependencies] 18 | cpufeatures = "0.2" 19 | sha2 = "0.10" 20 | 21 | [dev-dependencies] 22 | rustc-hex = "2" 23 | 24 | [target.'cfg(target_arch = "wasm32")'.dev-dependencies] 25 | wasm-bindgen-test = "0.3.33" 26 | 27 | [features] 28 | default = ["zero_hash_cache"] 29 | zero_hash_cache = [] 30 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright 2022 Sigma Prime Pty Ltd 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | `ethereum_hashing` 2 | ================ 3 | [![codecov](https://codecov.io/gh/sigp/ethereum_hashing/graph/badge.svg?token=HWAAKXSPIP)](https://codecov.io/gh/sigp/ethereum_hashing) 4 | 5 | This package contains optimized implementations of hashing functions for Ethereum. 6 | 7 | It is maintained by Sigma Prime for use in Lighthouse, with an eye to being useful in the Rust 8 | Ethereum ecosystem more broadly. We welcome new contributors! 9 | 10 | Please see the [docs](https://docs.rs/ethereum_hashing) for more information. 11 | -------------------------------------------------------------------------------- /src/lib.rs: -------------------------------------------------------------------------------- 1 | //! Optimized SHA256 for use in Ethereum. 2 | //! 3 | //! The initial purpose of this crate was to provide an abstraction over the hash function used in 4 | //! the beacon chain. The hash function changed during the specification process, so defining it 5 | //! once in this crate made it easy to replace. 6 | //! 7 | //! Now this crate serves primarily as a wrapper over two SHA256 crates: `sha2` and `ring` – which 8 | //! it switches between at runtime based on the availability of SHA intrinsics. 9 | 10 | mod sha2_impl; 11 | 12 | pub use self::DynamicContext as Context; 13 | 14 | #[cfg(target_arch = "x86_64")] 15 | use sha2_impl::Sha2CrateImpl; 16 | 17 | #[cfg(feature = "zero_hash_cache")] 18 | use std::sync::LazyLock; 19 | 20 | /// Length of a SHA256 hash in bytes. 21 | pub const HASH_LEN: usize = 32; 22 | 23 | /// Returns the digest of `input` using the best available implementation. 24 | pub fn hash(input: &[u8]) -> Vec { 25 | DynamicImpl::best().hash(input) 26 | } 27 | 28 | /// Hash function returning a fixed-size array (to save on allocations). 29 | /// 30 | /// Uses the best available implementation based on CPU features. 31 | pub fn hash_fixed(input: &[u8]) -> [u8; HASH_LEN] { 32 | DynamicImpl::best().hash_fixed(input) 33 | } 34 | 35 | /// Compute the hash of two slices concatenated. 36 | pub fn hash32_concat(h1: &[u8], h2: &[u8]) -> [u8; 32] { 37 | let mut ctxt = DynamicContext::new(); 38 | ctxt.update(h1); 39 | ctxt.update(h2); 40 | ctxt.finalize() 41 | } 42 | 43 | /// Context trait for abstracting over implementation contexts. 44 | pub trait Sha256Context { 45 | fn new() -> Self; 46 | 47 | fn update(&mut self, bytes: &[u8]); 48 | 49 | fn finalize(self) -> [u8; HASH_LEN]; 50 | } 51 | 52 | /// Top-level trait implemented by both `sha2` and `ring` implementations. 53 | pub trait Sha256 { 54 | type Context: Sha256Context; 55 | 56 | fn hash(&self, input: &[u8]) -> Vec; 57 | 58 | fn hash_fixed(&self, input: &[u8]) -> [u8; HASH_LEN]; 59 | } 60 | 61 | /// Implementation of SHA256 using the `ring` crate (fastest on CPUs without SHA extensions). 62 | pub struct RingImpl; 63 | 64 | impl Sha256Context for ring::digest::Context { 65 | fn new() -> Self { 66 | Self::new(&ring::digest::SHA256) 67 | } 68 | 69 | fn update(&mut self, bytes: &[u8]) { 70 | self.update(bytes) 71 | } 72 | 73 | fn finalize(self) -> [u8; HASH_LEN] { 74 | let mut output = [0; HASH_LEN]; 75 | output.copy_from_slice(self.finish().as_ref()); 76 | output 77 | } 78 | } 79 | 80 | impl Sha256 for RingImpl { 81 | type Context = ring::digest::Context; 82 | 83 | fn hash(&self, input: &[u8]) -> Vec { 84 | ring::digest::digest(&ring::digest::SHA256, input) 85 | .as_ref() 86 | .into() 87 | } 88 | 89 | fn hash_fixed(&self, input: &[u8]) -> [u8; HASH_LEN] { 90 | let mut ctxt = Self::Context::new(&ring::digest::SHA256); 91 | ctxt.update(input); 92 | ctxt.finalize() 93 | } 94 | } 95 | 96 | /// Default dynamic implementation that switches between available implementations. 97 | pub enum DynamicImpl { 98 | #[cfg(target_arch = "x86_64")] 99 | Sha2, 100 | Ring, 101 | } 102 | 103 | // Runtime latch for detecting the availability of SHA extensions on x86_64. 104 | // 105 | // Inspired by the runtime switch within the `sha2` crate itself. 106 | #[cfg(target_arch = "x86_64")] 107 | cpufeatures::new!(x86_sha_extensions, "sha", "sse2", "ssse3", "sse4.1"); 108 | 109 | #[inline(always)] 110 | pub fn have_sha_extensions() -> bool { 111 | #[cfg(target_arch = "x86_64")] 112 | return x86_sha_extensions::get(); 113 | 114 | #[cfg(not(target_arch = "x86_64"))] 115 | return false; 116 | } 117 | 118 | impl DynamicImpl { 119 | /// Choose the best available implementation based on the currently executing CPU. 120 | #[inline(always)] 121 | pub fn best() -> Self { 122 | #[cfg(target_arch = "x86_64")] 123 | if have_sha_extensions() { 124 | Self::Sha2 125 | } else { 126 | Self::Ring 127 | } 128 | 129 | #[cfg(not(target_arch = "x86_64"))] 130 | Self::Ring 131 | } 132 | } 133 | 134 | impl Sha256 for DynamicImpl { 135 | type Context = DynamicContext; 136 | 137 | #[inline(always)] 138 | fn hash(&self, input: &[u8]) -> Vec { 139 | match self { 140 | #[cfg(target_arch = "x86_64")] 141 | Self::Sha2 => Sha2CrateImpl.hash(input), 142 | Self::Ring => RingImpl.hash(input), 143 | } 144 | } 145 | 146 | #[inline(always)] 147 | fn hash_fixed(&self, input: &[u8]) -> [u8; HASH_LEN] { 148 | match self { 149 | #[cfg(target_arch = "x86_64")] 150 | Self::Sha2 => Sha2CrateImpl.hash_fixed(input), 151 | Self::Ring => RingImpl.hash_fixed(input), 152 | } 153 | } 154 | } 155 | 156 | /// Context encapsulating all implemenation contexts. 157 | /// 158 | /// This enum ends up being 8 bytes larger than the largest inner context. 159 | pub enum DynamicContext { 160 | #[cfg(target_arch = "x86_64")] 161 | Sha2(sha2::Sha256), 162 | Ring(ring::digest::Context), 163 | } 164 | 165 | impl Sha256Context for DynamicContext { 166 | fn new() -> Self { 167 | match DynamicImpl::best() { 168 | #[cfg(target_arch = "x86_64")] 169 | DynamicImpl::Sha2 => Self::Sha2(Sha256Context::new()), 170 | DynamicImpl::Ring => Self::Ring(Sha256Context::new()), 171 | } 172 | } 173 | 174 | fn update(&mut self, bytes: &[u8]) { 175 | match self { 176 | #[cfg(target_arch = "x86_64")] 177 | Self::Sha2(ctxt) => Sha256Context::update(ctxt, bytes), 178 | Self::Ring(ctxt) => Sha256Context::update(ctxt, bytes), 179 | } 180 | } 181 | 182 | fn finalize(self) -> [u8; HASH_LEN] { 183 | match self { 184 | #[cfg(target_arch = "x86_64")] 185 | Self::Sha2(ctxt) => Sha256Context::finalize(ctxt), 186 | Self::Ring(ctxt) => Sha256Context::finalize(ctxt), 187 | } 188 | } 189 | } 190 | 191 | /// The max index that can be used with `ZERO_HASHES`. 192 | #[cfg(feature = "zero_hash_cache")] 193 | pub const ZERO_HASHES_MAX_INDEX: usize = 48; 194 | 195 | #[cfg(feature = "zero_hash_cache")] 196 | /// Cached zero hashes where `ZERO_HASHES[i]` is the hash of a Merkle tree with 2^i zero leaves. 197 | pub static ZERO_HASHES: LazyLock> = LazyLock::new(|| { 198 | let mut hashes = vec![[0; HASH_LEN]; ZERO_HASHES_MAX_INDEX + 1]; 199 | 200 | for i in 0..ZERO_HASHES_MAX_INDEX { 201 | hashes[i + 1] = hash32_concat(&hashes[i], &hashes[i]); 202 | } 203 | 204 | hashes 205 | }); 206 | 207 | #[cfg(test)] 208 | mod tests { 209 | use super::*; 210 | use rustc_hex::FromHex; 211 | 212 | #[cfg(target_arch = "wasm32")] 213 | use wasm_bindgen_test::*; 214 | 215 | #[cfg_attr(not(target_arch = "wasm32"), test)] 216 | #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)] 217 | fn test_hashing() { 218 | let input: Vec = b"hello world".as_ref().into(); 219 | 220 | let output = hash(input.as_ref()); 221 | let expected_hex = "b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9"; 222 | let expected: Vec = expected_hex.from_hex().unwrap(); 223 | assert_eq!(expected, output); 224 | } 225 | 226 | #[cfg(feature = "zero_hash_cache")] 227 | mod zero_hash { 228 | use super::*; 229 | 230 | #[test] 231 | fn zero_hash_zero() { 232 | assert_eq!(ZERO_HASHES[0], [0; 32]); 233 | } 234 | } 235 | } 236 | -------------------------------------------------------------------------------- /src/sha2_impl.rs: -------------------------------------------------------------------------------- 1 | // This implementation should only be compiled on x86_64 due to its dependency on the `sha2` and 2 | // `cpufeatures` crates which do not compile on some architectures like RISC-V. 3 | #![cfg(target_arch = "x86_64")] 4 | 5 | use crate::{Sha256, Sha256Context, HASH_LEN}; 6 | use sha2::Digest; 7 | 8 | /// Implementation of SHA256 using the `sha2` crate (fastest on x86_64 CPUs with SHA extensions). 9 | pub struct Sha2CrateImpl; 10 | 11 | impl Sha256Context for sha2::Sha256 { 12 | fn new() -> Self { 13 | sha2::Digest::new() 14 | } 15 | 16 | fn update(&mut self, bytes: &[u8]) { 17 | sha2::Digest::update(self, bytes) 18 | } 19 | 20 | fn finalize(self) -> [u8; HASH_LEN] { 21 | sha2::Digest::finalize(self).into() 22 | } 23 | } 24 | 25 | impl Sha256 for Sha2CrateImpl { 26 | type Context = sha2::Sha256; 27 | 28 | fn hash(&self, input: &[u8]) -> Vec { 29 | Self::Context::digest(input).into_iter().collect() 30 | } 31 | 32 | fn hash_fixed(&self, input: &[u8]) -> [u8; HASH_LEN] { 33 | Self::Context::digest(input).into() 34 | } 35 | } 36 | --------------------------------------------------------------------------------