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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| {-# LANGUAGE DataKinds #-} | ||
| {-# LANGUAGE DerivingStrategies #-} | ||
| {-# LANGUAGE ImportQualifiedPost #-} | ||
| {-# LANGUAGE OverloadedStrings #-} | ||
| {-# LANGUAGE RankNTypes #-} | ||
| {-# LANGUAGE ScopedTypeVariables #-} | ||
| {-# LANGUAGE TypeApplications #-} | ||
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| -- | Implementation of the `keccack256` pact native. | ||
| -- | ||
| -- `keccak256` takes as input a Pact object representing a | ||
| -- 'HyperlaneMessage', and returns a base16-encoded hash of the abi-encoding | ||
| -- of the input. | ||
| module Crypto.Hash.Keccak256Native (keccak256) where | ||
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| import Control.Exception (Exception(..), SomeException(..), try) | ||
| import Control.Lens ((^.)) | ||
| import Control.Monad (forM_) | ||
| import Control.Monad.Catch (throwM) | ||
| import Data.ByteString.Base64 qualified as Base64 | ||
| import Data.ByteString.Short qualified as BSS | ||
| import Data.Hash.Class.Mutable (initialize, finalize, updateByteString) | ||
| import Data.Hash.Internal.OpenSSL (OpenSslException(..)) | ||
| import Data.Hash.Keccak (Keccak256(..)) | ||
| import Data.Text (Text) | ||
| import Data.Text.Encoding qualified as Text | ||
| import Data.Vector (Vector) | ||
| import Pact.Types.Term (Term, Name, _TLitString) | ||
| import System.IO.Unsafe (unsafePerformIO) | ||
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||
| keccak256 :: Vector (Term Name) -> Text | ||
| keccak256 strings = unsafePerformIO $ do | ||
| e <- try @SomeException @_ $ do | ||
| ctx <- initialize @Keccak256 | ||
| forM_ strings $ \string -> do | ||
| let s = string ^. _TLitString | ||
| case Base64.decode (Text.encodeUtf8 s) of | ||
| Left b64Err -> do | ||
| throwM (Base64Exception b64Err) | ||
| Right bytes -> do | ||
| updateByteString @Keccak256 ctx bytes | ||
| Keccak256 hash <- finalize ctx | ||
| pure (BSS.fromShort hash) | ||
| case e of | ||
| Left err | ||
| | Just (OpenSslException _) <- fromException err -> error "keccak256 failed" | ||
| | Just (Base64Exception _) <- fromException err -> error "keccak256 failed: invalid base64 input" | ||
| | otherwise -> error "keccak256 failed" | ||
| Right hash -> pure (Text.decodeUtf8 (Base64.encode hash)) | ||
| {-# noinline keccak256 #-} | ||
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| newtype Base64Exception = Base64Exception String | ||
| deriving stock (Show) | ||
|
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| instance Exception Base64Exception where | ||
| displayException (Base64Exception err) = | ||
| "base64 decode exception: " ++ err |
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