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efficient and practical cryptohashing in haskell

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README.md

CryptoHash

hs-cryptohash provides lots of different secure digest algorithms, also called cryptohashes. It exposes every common hashes, but also some more exotic hashes, provides an extensive list of hashes available with a consistant API.

The general performance are comparable to the most optimised hashes available.

The complete list of supported hashes:

  • MD2, MD4, MD5
  • RIPEMD160
  • SHA1
  • SHA-2 family: 224, 256, 384, 512 and the newer 512t
  • Skein: 256, 512
  • Tiger

You can easily import any hash with the following:

import qualified Crypto.Hash.<HASH> as <Hash>

suggestion: it's easier to import qualified since there's a collision with the init symbol, but for only importing the hash or hashlazy function there's no such need.

Every hashes, exposes a very similar API.

Incremental API

it's based on 3 different functions, similar to the lowlevel operations of a typical hash:

  • init: create a new hash context
  • update: update non-destructively a new hash context with a strict bytestring
  • finalize: finalize the context and returns a digest bytestring.

all those operations are completely pure, and instead of changing the context as usual in others language, it create a new context each time.

One Pass API

The one pass API use the incremental API under the hood, but expose common operations to create digests out of a bytestring and lazy bytestring.

  • hash: create a digest (init+update+finalize) from a strict bytestring
  • hashlazy: create a digest (init+update+finalize) from a lazy bytestring

Integration with crypto-api

cryptohash is fully integrated with crypto-api and you can use the related function in crypto-api to use any cryptohash modules.

Performance

Cryptohash uses C implementations to provides maximum performance. see the cbits directory for more information

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