haskell/cryptonite
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Compatibility with older version

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This commit is contained in:
Vincent Hanquez 2017-02-14 15:59:56 +00:00
parent 343b7593b5
commit c342d28436
1 changed files with 12 additions and 1 deletions
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13
Crypto/Internal/Nat.hs
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@ -1,3 +1,4 @@
{-# LANGUAGE CPP #-}
{-# LANGUAGE ForeignFunctionInterface #-}
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE KindSignatures #-}
@ -11,10 +12,11 @@ module Crypto.Internal.Nat
( type IsDivisibleBy8
) where
import GHC.TypeLits (Nat, KnownNat, natVal, type (+), type (-), TypeError, ErrorMessage(..))
import GHC.TypeLits
type family IsDiv8 (bitLen :: Nat) (n :: Nat) where
IsDiv8 bitLen 0 = 'True
#if MIN_VERSION_base(4,9,0)
IsDiv8 bitLen 1 = TypeError ('Text "bitLen " ':<>: 'ShowType bitLen ':<>: 'Text " is not divisible by 8")
IsDiv8 bitLen 2 = TypeError ('Text "bitLen " ':<>: 'ShowType bitLen ':<>: 'Text " is not divisible by 8")
IsDiv8 bitLen 3 = TypeError ('Text "bitLen " ':<>: 'ShowType bitLen ':<>: 'Text " is not divisible by 8")
@ -22,6 +24,15 @@ type family IsDiv8 (bitLen :: Nat) (n :: Nat) where
IsDiv8 bitLen 5 = TypeError ('Text "bitLen " ':<>: 'ShowType bitLen ':<>: 'Text " is not divisible by 8")
IsDiv8 bitLen 6 = TypeError ('Text "bitLen " ':<>: 'ShowType bitLen ':<>: 'Text " is not divisible by 8")
IsDiv8 bitLen 7 = TypeError ('Text "bitLen " ':<>: 'ShowType bitLen ':<>: 'Text " is not divisible by 8")
#else
IsDiv8 bitLen 1 = 'False
IsDiv8 bitLen 2 = 'False
IsDiv8 bitLen 3 = 'False
IsDiv8 bitLen 4 = 'False
IsDiv8 bitLen 5 = 'False
IsDiv8 bitLen 6 = 'False
IsDiv8 bitLen 7 = 'False
#endif
IsDiv8 bitLen n = IsDiv8 n (Mod8 n)
type family Mod8 (n :: Nat) where