From 94d351004688992f8aeac7d03da55d179ef50e8c Mon Sep 17 00:00:00 2001
From: Joey Hess <joeyh@joeyh.name>
Date: Sat, 6 Aug 2016 21:39:38 -0400
Subject: more cost calculation and refactored Tunables

---
 ExpensiveHash.hs | 45 ++++++++++++++++-----------------------------
 1 file changed, 16 insertions(+), 29 deletions(-)

(limited to 'ExpensiveHash.hs')

diff --git a/ExpensiveHash.hs b/ExpensiveHash.hs
index 8bfe004..ca357bc 100644
--- a/ExpensiveHash.hs
+++ b/ExpensiveHash.hs
@@ -3,6 +3,8 @@
 module ExpensiveHash where
 
 import Types
+import Cost
+import Tunables
 import qualified Data.ByteString as B
 import Raaz.Core.Encode
 import qualified Crypto.Argon2 as Argon2
@@ -14,41 +16,26 @@ import Control.DeepSeq
 -- This is a lynchpin of keysafe's security, because using this hash
 -- as an encryption key forces brute force attackers to generate
 -- hashes over and over again, taking a very long time.
-data ExpensiveHash = ExpensiveHash Cost B.ByteString
+data ExpensiveHash = ExpensiveHash (Cost CreationOp) B.ByteString
 	deriving (Show)
 
 data Salt t = Salt t
 
-expensiveHash :: Encodable t => RunMode -> Salt t -> Password -> ExpensiveHash
-expensiveHash runmode (Salt s) (Password password) = 
-	ExpensiveHash cost $ Argon2.hash o password (toByteString s)
-  where
-	HashParams o cost = hashParams runmode
+expensiveHash :: Encodable t => Tunables -> Salt t -> Password -> ExpensiveHash
+expensiveHash tunables (Salt s) (Password password) = 
+	ExpensiveHash (argonCost tunables) $
+		Argon2.hash (argonOptions tunables) password (toByteString s)
 
-data HashParams = HashParams Argon2.HashOptions Cost
-
-hashParams :: RunMode -> HashParams
-hashParams SecureMode = HashParams o cost
-  where
-	-- argon2 is GPU and ASIC resistent, so it uses CPU time.
-	-- The selected HashOptions were benchmarked at 661 seconds CPU time
-	-- on a 2 core Intel(R) Core(TM) i5-4210Y CPU @ 1.50GHz.
-	cost = CPUCost (Seconds 600)
-	o = Argon2.HashOptions
-		{ Argon2.hashIterations = 10000
-		, Argon2.hashMemory = 131072 -- 128 mebibtyes per thread
-		, Argon2.hashParallelism = 4 -- 4 threads
-		, Argon2.hashVariant = Argon2.Argon2i
-		}
-hashParams TestingMode =
-	HashParams Argon2.defaultHashOptions $ CPUCost (Seconds 0)
-
-benchmarkExpensiveHash :: IO (Benchmark Cost)
-benchmarkExpensiveHash = do
+benchmarkExpensiveHash :: Tunables -> IO (Benchmark (Cost CreationOp))
+benchmarkExpensiveHash tunables = do
 	start <- getCurrentTime
-	let ExpensiveHash expected b = expensiveHash SecureMode
+	let ExpensiveHash expected b = expensiveHash tunables
 		(Salt (KeyIdent gpgKey (Name ("benchmark" :: B.ByteString))))
 		(Password ("himom" :: B.ByteString))
 	end <- b `deepseq` getCurrentTime
-	let actual = (CPUCost $ Seconds $ end `diffUTCTime` start)
-	return $ Benchmark { expectedBenchmark = expected, actualBenchmark = actual }
+	let diff = floor $ end `diffUTCTime` start
+	let actual = CPUCost $ Seconds diff
+	return $ Benchmark
+		{ expectedBenchmark = expected
+		, actualBenchmark = actual
+		}
-- 
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