vips-hash 0.2.0

# eth-hash

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The Ethereum hashing function, keccak256, sometimes (erroneously) called sha3

Note: the similarly named [pyethash](https://github.com/ethereum/ethash) has a completely different use: it generates proofs of work.

This is a low-level library, intended to be used internally by other Ethereum tools. If you’re looking for a convenient hashing tool, check out [eth_utils.keccak()](https://github.com/ethereum/eth-utils#crypto-utils) which will be a little friendlier, and provide access to other helpful utilities.

Read more in the [documentation on ReadTheDocs](http://eth-hash.readthedocs.io/). [View the change log](http://eth-hash.readthedocs.io/en/latest/releases.html).

## Quickstart

`sh pip install eth-hash[pycryptodomex] `

`py >>> from eth_hash.auto import keccak >>> keccak(b'') b"\xc5\xd2F\x01\x86\xf7#<\x92~}\xb2\xdc\xc7\x03\xc0\xe5\x00\xb6S\xca\x82';{\xfa\xd8\x04]\x85\xa4p" `

See the [docs](http://eth-hash.readthedocs.io/en/latest/quickstart.html#quickstart) for more about choosing and installing backends.

## Developer setup

If you would like to hack on eth-hash, please check out the [Ethereum Development Tactical Manual](https://github.com/pipermerriam/ethereum-dev-tactical-manual) for information on how we do:

• Testing

• Pull Requests

• Code Style

• Documentation

### Development Environment Setup

You can set up your dev environment with:

git clone git@github.com:ethereum/eth-hash.git cd eth-hash virtualenv -p python3 venv . venv/bin/activate pip install -e .[dev]

### Testing Setup

During development, you might like to have tests run on every file save.

Show flake8 errors on file change:

`sh # Test flake8 when-changed -v -s -r -1 eth_hash/ tests/ -c "clear; flake8 eth_hash tests && echo 'flake8 success' || echo 'error'" `

Run multi-process tests in one command, but without color:

`sh # in the project root: pytest --numprocesses=4 --looponfail --maxfail=1 # the same thing, succinctly: pytest -n 4 -f --maxfail=1 `

Run in one thread, with color and desktop notifications:

`sh cd venv ptw --onfail "notify-send -t 5000 'Test failure ⚠⚠⚠⚠⚠' 'python 3 test on eth-hash failed'" ../tests ../eth_hash `

### Release setup

For Debian-like systems: ` apt install pandoc `

To release a new version:

`sh make release bump=$$VERSION_PART_TO_BUMP$$ `

#### How to bumpversion

The version format for this repo is {major}.{minor}.{patch} for stable, and {major}.{minor}.{patch}-{stage}.{devnum} for unstable (stage can be alpha or beta).

To issue the next version in line, specify which part to bump, like make release bump=minor or make release bump=devnum.

If you are in a beta version, make release bump=stage will switch to a stable.

To issue an unstable version when the current version is stable, specify the new version explicitly, like make release bump=”–new-version 4.0.0-alpha.1 devnum”