initial version

.gitignore

@@ -0,0 +1,5 @@
+/target
+**/*.rs.bk
+Cargo.lock
+*~
+*.bak

Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "libhash"
+version = "0.1.0"
+authors = ["Maxim Zakharov <5158255+Maxime2@users.noreply.github.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+serde = { version = "1.0.97", features = ["derive"] }

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2019 Fantom Foundation
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -0,0 +1,33 @@
+libhash
+===========
+[![Build Status](https://travis-ci.org/Fantom-foundation/libhash.svg?branch=master)](https://travis-ci.org/Fantom-foundation/libhash)
+
+libhash in Rust.
+
+## RFCs
+
+https://github.com/Fantom-foundation/fantom-rfcs
+
+# Developer guide
+
+Install the latest version of [Rust](https://www.rust-lang.org). We tend to use nightly versions. [CLI tool for installing Rust](https://rustup.rs).
+
+We use [rust-clippy](https://github.com/rust-lang-nursery/rust-clippy) linters to improve code quality.
+
+There are plenty of [IDEs](https://areweideyet.com) and other [Rust development tools to consider](https://github.com/rust-unofficial/awesome-rust#development-tools).
+
+### Step-by-step guide
+```bash
+# Install Rust (nightly)
+$ curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain nightly
+# Install cargo-make (cross-platform feature-rich reimplementation of Make)
+$ cargo install --force cargo-make
+# Install rustfmt (Rust formatter)
+$ rustup component add rustfmt
+# Clone this repo
+$ git clone https://github.com/Fantom-foundation/libhash && cd libhash
+# Run tests
+$ cargo test
+# Format, build and test
+$ cargo make
+```

src/errors.rs

@@ -0,0 +1,7 @@
+/// Hashing errors.
+#[derive(Debug)]
+pub enum Error {
+    /// A serialization error in `compute_hash`.
+    //#[fail(display = "Serialization error: {}", _0)]
+    ComputeHashSerialize(String),
+}

src/lib.rs

@@ -0,0 +1,31 @@
+use crate::errors::Error;
+use serde::{Deserialize, Serialize};
+
+// Hash type used in
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Serialize, Deserialize)]
+pub struct Hash(pub [u8; 32]);
+
+pub trait Hashing {
+    fn hash<D: Serialize>(data: &D) -> Result<Hash, Error>;
+    fn new(digest: &[u8]) -> Hash {
+        let mut a: [u8; 32] = [0; 32];
+        a.copy_from_slice(&digest[0..32]);
+        Hash(a)
+    }
+}
+
+impl AsRef<[u8]> for Hash {
+    fn as_ref(&self) -> &[u8] {
+        self.0.as_ref()
+    }
+}
+
+pub mod errors;
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn it_works() {
+        assert_eq!(2 + 2, 4);
+    }
+}