From 395f75c6b7f66d313b4d44be4ed1317f9d7c7042 Mon Sep 17 00:00:00 2001
From: joe <joe@jerkface.net>
Date: Sun, 15 Dec 2013 22:06:29 -0500
Subject: Adapted to new ecc solutoin for OpenPGP-Haskell

---
 Data/OpenPGP/Util/Verify.hs | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

(limited to 'Data/OpenPGP/Util/Verify.hs')

diff --git a/Data/OpenPGP/Util/Verify.hs b/Data/OpenPGP/Util/Verify.hs
index 2367570..b42e664 100644
--- a/Data/OpenPGP/Util/Verify.hs
+++ b/Data/OpenPGP/Util/Verify.hs
@@ -1,5 +1,7 @@
+{-# LANGUAGE OverloadedStrings #-}
 module Data.OpenPGP.Util.Verify where
 
+import Debug.Trace
 import qualified Data.OpenPGP as OpenPGP
 import Data.Maybe
 import Data.Binary (encode)
@@ -9,6 +11,8 @@ import qualified Data.ByteString.Lazy as LZ
 
 import qualified Crypto.PubKey.DSA as Vincent.DSA
 import qualified Crypto.PubKey.RSA.PKCS15 as Vincent.RSA
+import qualified Crypto.PubKey.ECC.ECDSA as Vincent.ECDSA
+-- import Math.NumberTheory.Moduli
 
 import Data.OpenPGP.Util.Base
 
@@ -19,6 +23,14 @@ dsaKey k = Vincent.DSA.PublicKey
     (keyParam 'y' k)
 
 
+{-
+applyCurve :: Vincent.ECDSA.CurveCommon -> Integer -> Integer
+applyCurve curve x = x*x*x + x*a + b
+ where
+    a = Vincent.ECDSA.ecc_a curve
+    b = Vincent.ECDSA.ecc_b curve
+-}
+
 -- | Verify a message signature
 verify ::
     OpenPGP.Message          -- ^ Keys that may have made the signature
@@ -35,17 +47,28 @@ verifyOne keys sig over = fmap (const sig) $ maybeKey >>= verification >>= guard
     where
     verification = case OpenPGP.key_algorithm sig of
         OpenPGP.DSA -> dsaVerify
+        OpenPGP.ECDSA -> ecdsaVerify
         alg | alg `elem` [OpenPGP.RSA,OpenPGP.RSA_S] -> rsaVerify
             | otherwise -> const Nothing
     dsaVerify k = let k' = dsaKey k in 
         Just $ Vincent.DSA.verify (dsaTruncate k' . bhash) k' dsaSig over
+    ecdsaVerify k = let k' = ecdsaKey k
+                        r = Just $ Vincent.ECDSA.verify bhash k' ecdsaSig over
+                    in r -- trace ("ecdsaVerify: "++show r) r
     rsaVerify k = Just $ Vincent.RSA.verify desc (rsaKey k) over rsaSig
     [rsaSig] = map (toStrictBS . LZ.drop 2 . encode) (OpenPGP.signature sig)
     dsaSig = let [OpenPGP.MPI r, OpenPGP.MPI s] = OpenPGP.signature sig in
         Vincent.DSA.Signature r s
+    ecdsaSig = let [OpenPGP.MPI r, OpenPGP.MPI s] = OpenPGP.signature sig in
+        Vincent.ECDSA.Signature r s
     dsaTruncate (Vincent.DSA.PublicKey (Vincent.DSA.Params _ _ q) _) = BS.take (integerBytesize q)
+    {-
+    ecdsaTruncate (Vincent.ECDSA.PublicKey _ (Vincent.ECDSA.Point x y)) = BS.take (integerBytesize x
+                                                                                  + integerBytesize y )
+    -}
     bhash = hashBySymbol hash_algo . toLazyBS
     desc = hashAlgoDesc hash_algo
     hash_algo = OpenPGP.hash_algorithm sig
     maybeKey = OpenPGP.signature_issuer sig >>= find_key keys
+               -- in trace ("maybeKey="++show (fmap OpenPGP.key_algorithm r)) r
 
-- 
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