Hello! I'm pleased to announce the first release of crypto-conduit [1]! The crypto-api [2] package provides APIs for many cryptographic operations, such as cryptographic hashes and block ciphers. This new crypto-conduit package allows you to use many of these operations with conduits [3], giving you safe I/O using constant memory and no leaks. As an example, here's how you could get the SHA1 hash a file: import Crypto.Conduit -- from crypto-conduit import Crypto.Hash.SHA1 (SHA1) -- from cryptohash import Data.Conduit -- from conduit import Data.Conduit.Binary (sourceFile) -- from conduit main = do hash <- runResourceT $ sourceFile "my-file" $$ sinkHash print (hash :: SHA1) The code snippet above, despite having only "sourceFile ... $$ sinkHash" on its core, guarantees that the file handle is not kept open and uses a constant amount of memory. Sweet! Please break this package! Although it comes with a test suite, it has just seen the light of the day. Cheers, =) [1] http://hackage.haskell.org/package/crypto-conduit [2] http://hackage.haskell.org/package/crypto-api [3] http://hackage.haskell.org/package/conduit -- Felipe.