cryptohash-sha256: Fast, pure and practical SHA-256 implementation

[ bsd3, cryptography, data, library ] [ Propose Tags ]

A practical incremental and one-pass, pure API to the SHA-256 cryptographic hash algorithm according to FIPS 180-4 with performance close to the fastest implementations available in other languages.

The core SHA-256 algorithm is implemented in C and is thus expected to be as fast as the standard sha256sum(1) tool; for instance, on an Intel Core i7-3770 at 3.40GHz this implementation can compute a SHA-256 hash over 230 MiB of data in under one second. (If, instead, you require a pure Haskell implementation and performance is secondary, please refer to the SHA package.)

Additionally, this package provides support for

conforming to RFC6234, RFC4231, RFC5869, et al..

Relationship to the cryptohash package and its API

This package has been originally a fork of cryptohash-0.11.7 because the cryptohash package had been deprecated and so this package continues to satisfy the need for a lightweight package providing the SHA-256 hash algorithm without any dependencies on packages other than base and bytestring. The API exposed by cryptohash-sha256-0.11.*'s Crypto.Hash.SHA256 module is guaranteed to remain a compatible superset of the API provided by the cryptohash-0.11.7's module of the same name.

Consequently, this package is designed to be used as a drop-in replacement for cryptohash-0.11.7's Crypto.Hash.SHA256 module, though with a clearly smaller footprint by almost 3 orders of magnitude.

Change log
Dependencies base (>=4.5 && <4.12), bytestring (>=0.9.2 && <0.11) [details]
License BSD-3-Clause
Copyright Vincent Hanquez, Herbert Valerio Riedel
Maintainer Herbert Valerio Riedel <>
Revised Revision 1 made by HerbertValerioRiedel at Fri Mar 9 22:01:45 UTC 2018
Category Data, Cryptography
Home page
Bug tracker
Source repo head: git clone
Uploaded by HerbertValerioRiedel at Mon Nov 13 08:17:55 UTC 2017
Distributions Arch:, Fedora:, LTSHaskell:, NixOS:, Stackage:, openSUSE:
Executables sha256sum
Downloads 23925 total (195 in the last 30 days)
Rating 2.0 (votes: 1) [estimated by rule of succession]
Your Rating
  • λ
  • λ
  • λ
Status Docs available [build log]
Last success reported on 2017-11-13 [all 1 reports]
Hackage Matrix CI





Enable building sha256sum executable


Use -f <flag> to enable a flag, or -f -<flag> to disable that flag. More info


Note: This package has metadata revisions in the cabal description newer than included in the tarball. To unpack the package including the revisions, use 'cabal get'.

Maintainer's Corner

For package maintainers and hackage trustees