bitcoin_hashes 0.20.0

Hash functions used by the rust-bitcoin eccosystem
Documentation 
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# Bitcoin Hashes Library

This is a simple, no-dependency library which implements the hash functions
needed by Bitcoin. These are SHA1, SHA256, SHA256d, SHA512, and RIPEMD160. As an
ancillary thing, it exposes hexadecimal serialization and deserialization,
since these are needed to display hashes anyway.

[Documentation](https://docs.rs/bitcoin_hashes/)

## Contributions

Contributions are welcome, including additional hash function implementations.

### Githooks

To assist devs in catching errors _before_ running CI we provide some githooks. If you do not
already have locally configured githooks you can use the ones in this repository by running, in the
root directory of the repository:

```bash
git config --local core.hooksPath githooks/
```

Alternatively add symlinks in your `.git/hooks` directory to any of the githooks we provide.

### Running Benchmarks

We use a custom Rust compiler configuration conditional to guard the benchmark code. To run the
benchmarks use: `RUSTFLAGS='--cfg=bench' cargo +nightly bench`.