Comment about not having Show instance for HMAC

Closes #232.
2018-04-21 07:55:25 +02:00 · 2018-04-21 07:55:25 +02:00 · 9d961e92e9
commit 9d961e92e9
parent a2a2372412
1 changed files with 2 additions and 1 deletions
--- a/Crypto/MAC/HMAC.hs
+++ b/Crypto/MAC/HMAC.hs
@ -32,7 +32,8 @@ import           Crypto.Internal.Imports

 -- | Represent an HMAC that is a phantom type with the hash used to produce the mac.
 --
-- The Eq instance is constant time.
+-- The Eq instance is constant time.  No Show instance is provided, to avoid
+-- printing by mistake.
 newtype HMAC a = HMAC { hmacGetDigest :: Digest a }
    deriving (ByteArrayAccess)