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
- SHA-2 family: 224, 256, 384, 512 and the newer 512t
- Skein: 256, 512
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.
Cryptohash uses C implementations to provides maximum performance. see the cbits directory for more information