some basic data types and expensive hashing

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+{-# LANGUAGE OverloadedStrings #-}
+
+module Types where
+
+import qualified Data.ByteString as B
+import qualified Data.ByteString.Char8 as B8
+import Raaz.Core.Encode
+import Data.Monoid
+import Data.Word
+import Data.Time.Clock
+import Text.Read
+
+-- | A password used to encrypt a key stored in keysafe.
+newtype Password = Password B.ByteString
+
+-- | A name associated with a key stored in keysafe.
+newtype Name = Name B.ByteString
+	deriving (Show)
+
+-- | The type of the key that is stored in keysafe.
+newtype KeyType = KeyType B.ByteString
+	deriving (Show)
+
+gpgKey :: KeyType
+gpgKey = KeyType "gpg"
+
+-- | Enough information to uniquely identify a key stored in keysafe.
+data KeyIdent = KeyIdent KeyType Name
+	deriving (Show)
+
+-- | A KeyIdent is serialized in the form "keytype name".
+-- For example "gpg Joey Hess"
+instance Encodable KeyIdent where
+	toByteString (KeyIdent (KeyType t) (Name n)) =
+		t <> B.singleton identSepChar <> n
+	fromByteString b = case B.break (== identSepChar) b of
+		(t, n)
+			| B.null n -> Nothing
+			| otherwise -> Just $
+				KeyIdent (KeyType t) (Name (B.drop 1 n))
+
+identSepChar :: Word8
+identSepChar = 32
+
+newtype ShardNum = ShardNum Int
+	deriving (Show)
+
+-- | Enough information to uniquely identify an object stored on a keysafe
+-- server for a key.
+data ObjectIdent = ObjectIdent ShardNum KeyIdent
+	deriving (Show)
+
+-- | An ObjectIdent is serialied in the form "shardnum keytype name"
+-- For example "1 gpg Joey Hess"
+instance Encodable ObjectIdent where
+	toByteString (ObjectIdent (ShardNum n) keyident) =
+		B8.pack (show n) <> B.singleton identSepChar <> toByteString keyident
+	fromByteString b = case B.break (== identSepChar) b of
+		(ns, rest)
+			| B.null ns -> Nothing
+			| otherwise -> do
+				keyident <- fromByteString (B.drop 1 rest)
+				n <- readMaybe (B8.unpack ns)
+				return $ ObjectIdent (ShardNum n) keyident
+
+-- | An estimated cost to perform an operation.
+data Cost = CPUCost Seconds | GPUCost Seconds
+	deriving (Show)
+
+newtype Seconds = Seconds NominalDiffTime
+	deriving (Show)
+
+data Benchmark t = Benchmark { expectedBenchmark :: t, actualBenchmark :: t }
+	deriving (Show)
+
+-- | In testing mode, the cryptographic difficulty is dialed back.
+data RunMode = SecureMode | TestingMode
+	deriving (Show)