ghc-cryptohash-sha256

Fast, pure and practical SHA-256 implementation

A practical incremental and one-pass, pure API to the [SHA-256 cryptographic hash algorithm](<a href="https://en.wikipedia.org/wiki/SHA-2">https://en.wikipedia.org/wiki/SHA-2</a> ) according to [FIPS 180-4](<a href="http://dx.doi.org/10.6028/NIST.FIPS.180-4">http://dx.doi.org/10.6028/NIST.FIPS.180-4</a> ) 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](<a href="https://linux.die.net/man/1/sha256sum);">https://linux.die.net/man/1/sha256sum);</a> 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](<a href="https://hackage.haskell.org/package/SHA">https://hackage.haskell.org/package/SHA</a> ).) Additionally, this package provides support for - HMAC-SHA-256: SHA-256-based [Hashed Message Authentication Codes](<a href="https://en.wikipedia.org/wiki/HMAC">https://en.wikipedia.org/wiki/HMAC</a> ) (HMAC) - HKDF-SHA-256: [HMAC-SHA-256-based Key Derivation Function](<a href="https://en.wikipedia.org/wiki/HKDF">https://en.wikipedia.org/wiki/HKDF</a> ) (HKDF) conforming to [RFC6234](<a href="https://tools.ietf.org/html/rfc6234">https://tools.ietf.org/html/rfc6234</a> ), [RFC4231](<a href="https://tools.ietf.org/html/rfc4231">https://tools.ietf.org/html/rfc4231</a> ), [RFC5869](<a href="https://tools.ietf.org/html/rfc5869">https://tools.ietf.org/html/rfc5869</a> ), et al.. === Packages in the 'cryptohash-*' family - <<a href="https://hackage.haskell.org/package/cryptohash-md5">https://hackage.haskell.org/package/cryptohash-md5</a> cryptohash-md5> - <<a href="https://hackage.haskell.org/package/cryptohash-sha1">https://hackage.haskell.org/package/cryptohash-sha1</a> cryptohash-sha1> - <<a href="https://hackage.haskell.org/package/cryptohash-sha256">https://hackage.haskell.org/package/cryptohash-sha256</a> cryptohash-sha256> - <<a href="https://hackage.haskell.org/package/cryptohash-sha512">https://hackage.haskell.org/package/cryptohash-sha512</a> cryptohash-sha512> === 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](<a href="https://www.reddit.com/r/haskell/comments/5lxv75/psa_please_use_unique_module_names_when_uploading/dbzegx3/">https://www.reddit.com/r/haskell/comments/5lxv75/psa_please_use_unique_module_names_when_uploading/dbzegx3/</a> ).