Package: vips-hash
# eth-hash[![Join the chat athttps://gitter.im/ethereum/web3.py](https://badges.gitter.im/ethereum/web3.py.svg)](https://gitter.im/ethereum/web3.py?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
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[![Docs build](https://readthedocs.org/projects/eth-hash/badge/?version=latest)](http://eth-hash.readthedocs.io/en/latest/?badge=latest)The Ethereum hashing function, keccak256, sometimes (erroneously) called sha3Note: 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 installeth-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 setupIf 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:TestingPull RequestsCode StyleDocumentation### Development Environment SetupYou can set up your dev environment with:git clonegit@github.com:ethereum/eth-hash.git
cd eth-hash
virtualenv -p python3 venv
. venv/bin/activate
pip install -e .[dev]### Testing SetupDuring development, you might like to have tests run on every file save.Show flake8 errors on file change:`sh # Test flake8when-changed-v-s-r-1eth_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-n4-f--maxfail=1`Run in one thread, with color and desktop notifications:`sh cd venv ptw--onfail"notify-send-t5000 'Test failure⚠⚠⚠⚠⚠''python 3 test oneth-hashfailed'"../tests../eth_hash`### Release setupFor Debian-like systems:` apt install pandoc `To release a new version:`sh make releasebump=$$VERSION_PART_TO_BUMP$$`#### How to bumpversionThe version format for this repo is{major}.{minor}.{patch}for stable, and{major}.{minor}.{patch}-{stage}.{devnum}for unstable (stagecan be alpha or beta).To issue the next version in line, specify which part to bump,
likemake release bump=minorormake release bump=devnum.If you are in a beta version,make release bump=stagewill switch to a stable.To issue an unstable version when the current version is stable, specify the
new version explicitly, likemake release bump=”–new-version 4.0.0-alpha.1 devnum”