:: a typeCtrl KGHC 9.10.3 · lts/ghc-9.10.x · 248f8f0 · 2026-10-05
Modulecryptohash-md5-0.11.101.0Haskell2010
A module containing MD5 bindings
This API is based on 4 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
updates: same as update, except that it takes a list of strict bytestrings
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 re-allocates a new context each time.
Example:
import qualified Data.ByteString
import qualified Crypto.Hash.MD5 as MD5
main = print digest
where
digest = MD5.finalize ctx
ctx = foldl MD5.update ctx0 (map Data.ByteString.pack [ [1,2,3], [4,5,6] ])
ctx0 = MD5.initMD5 Context
The context data is exactly 88 bytes long, however the data in the context is stored in host-endianness.
The context data is made up of
a Word64 representing the number of bytes already feed to hash algorithm so far,
a 64-element Word8 buffer holding partial input-chunks, and finally
a 4-element Word32 array holding the current work-in-progress digest-value.
Consequently, a MD5 digest as produced by hash, hashlazy, or finalize is 16 bytes long.
create a new hash context
update a context with a bytestring
updates a context with multiple bytestrings
finalize the context into a digest bytestring (16 bytes)
Variant of finalize also returning length of hashed content
hash a strict bytestring into a Ctx
hash a lazy bytestring into a Ctx
This API use the incremental API under the hood to provide the common all-in-one 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
hashlazyAndLength: create a digest (init + update + finalizeAndLength) from a lazy ByteString
Example:
import qualified Data.ByteString
import qualified Crypto.Hash.MD5 as MD5
main = print $ MD5.hash (Data.ByteString.pack [0..255])NOTE: The returned digest is a binary ByteString. For converting to a base16/hex encoded digest the base16-bytestring package is recommended.
hash a strict bytestring into a digest bytestring (16 bytes)
hash a lazy bytestring into a digest bytestring (16 bytes)
Variant of hashlazy which simultaneously computes the hash and length of a lazy bytestring.
Compute 16-byte RFC2104-compatible HMAC-Md5 digest for a strict bytestring message
Compute 16-byte RFC2104-compatible HMAC-MD5 digest for a lazy bytestring message
hmaclazyAndLength :: ByteStringsecret
-> ByteStringmessage
-> (ByteString, Word64)digest (32 bytes) and length of message
Variant of hmaclazy which also returns length of message