224 lines
8.2 KiB
Haskell
224 lines
8.2 KiB
Haskell
-- |
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-- Module : Crypto.PubKey.ECC.P256
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-- License : BSD-style
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-- Maintainer : Vincent Hanquez <vincent@snarc.org>
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-- Stability : experimental
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-- Portability : unknown
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--
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-- P256 support
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--
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{-# LANGUAGE GeneralizedNewtypeDeriving #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE BangPatterns #-}
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{-# LANGUAGE EmptyDataDecls #-}
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{-# OPTIONS_GHC -fno-warn-unused-binds #-}
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{-# OPTIONS_GHC -fno-warn-unused-matches #-}
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{-# OPTIONS_GHC -fno-warn-unused-imports #-}
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module Crypto.PubKey.ECC.P256
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( Scalar
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, Point
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) where
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import Data.Word
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import Foreign.Ptr
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import Foreign.C.Types
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import Crypto.Internal.Compat
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import Crypto.Internal.Imports
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--import Crypto.Internal.Memory
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import Crypto.Internal.ByteArray
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import qualified Crypto.Internal.ByteArray as B
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import Crypto.Error
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-- | A P256 scalar
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newtype Scalar = Scalar ScrubbedBytes
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deriving (Eq,ByteArrayAccess)
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-- | A P256 point
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data Point = Point !Bytes !Bytes
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deriving (Show,Eq)
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scalarSize :: Int
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scalarSize = 32
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type P256Digit = Word32
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data P256Scalar
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data P256Y
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data P256X
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------------------------------------------------------------------------
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-- Point methods
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------------------------------------------------------------------------
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-- | Lift to curve a scalar
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--
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-- Using the curve generator as base point compute:
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--
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-- > scalar * G
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--
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toPoint :: Scalar -> Point
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toPoint s = withNewPoint $ \px py -> withScalar s $ \p ->
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ccryptonite_p256_basepoint_mul p px py
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-- | Add a point to another point
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pointAdd :: Point -> Point -> Point
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pointAdd a b = withNewPoint $ \dx dy ->
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withPoint a $ \ax ay -> withPoint b $ \bx by ->
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ccryptonite_p256e_point_add ax ay bx by dx dy
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-- | Multiply a point by a scalar
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pointMul :: Scalar -> Point -> Point
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pointMul scalar p = withNewPoint $ \dx dy ->
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withScalar scalar $ \n -> withPoint p $ \px py ->
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ccryptonite_p256_point_mul n dx dy px py
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-- | multiply the point @p with @n2 and add a lifted to curve value @n1
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--
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-- > n1 * G + n2 * p
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pointsMulVarTime :: Scalar -> Scalar -> Point -> Point
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pointsMulVarTime n1 n2 p = withNewPoint $ \dx dy ->
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withScalar n1 $ \pn1 -> withScalar n2 $ \pn2 -> withPoint p $ \px py ->
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ccryptonite_p256_points_mul_vartime pn1 pn2 px py dx dy
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-- | Check if a 'Point' is valid
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pointIsValid :: Point -> Bool
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pointIsValid p = unsafeDoIO $ withPoint p $ \px py -> do
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r <- ccryptonite_p256_is_valid_point px py
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return (r /= 0)
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------------------------------------------------------------------------
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-- Scalar methods
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------------------------------------------------------------------------
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scalarZero :: Scalar
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scalarZero = withNewScalarFreeze $ \d -> ccryptonite_p256_init d
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-- | Perform addition between two scalars
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--
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-- > a + b
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scalarAdd :: Scalar -> Scalar -> Scalar
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scalarAdd a b =
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withNewScalarFreeze $ \d -> withScalar a $ \pa -> withScalar b $ \pb -> do
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void $ ccryptonite_p256_add pa pb d
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ccryptonite_p256_mod ccryptonite_SECP256r1_n d d
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-- | Perform subtraction between two scalars
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--
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-- > a - b
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scalarSub :: Scalar -> Scalar -> Scalar
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scalarSub a b =
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withNewScalarFreeze $ \d -> withScalar a $ \pa -> withScalar b $ \pb -> do
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void $ ccryptonite_p256_sub pa pb d
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ccryptonite_p256_mod ccryptonite_SECP256r1_n d d
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-- | Give the inverse of the scalar
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--
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-- > 1 / a
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scalarInv :: Scalar -> Scalar
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scalarInv a =
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withNewScalarFreeze $ \b -> withScalar a $ \pa ->
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ccryptonite_p256_modinv ccryptonite_SECP256r1_n pa b
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-- | similar to 'scalarInv' but instead of
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-- trying to be constant time, do it as fast as possible
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scalarInvVarTime :: Scalar -> Scalar
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scalarInvVarTime a =
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withNewScalarFreeze $ \b -> withScalar a $ \pa ->
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ccryptonite_p256_modinv_vartime ccryptonite_SECP256r1_n pa b
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scalarCmp :: Scalar -> Scalar -> Ordering
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scalarCmp a b = unsafeDoIO $
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withScalar a $ \pa -> withScalar b $ \pb -> do
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v <- ccryptonite_p256_cmp pa pb
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return $ compare v 0
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scalarFromBinary :: ByteArrayAccess ba => ba -> CryptoFailable Scalar
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scalarFromBinary ba
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| B.length ba /= scalarSize = CryptoFailed $ CryptoError_SecretKeySizeInvalid
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| otherwise =
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CryptoPassed $ withNewScalarFreeze $ \p -> B.withByteArray ba $ \b ->
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ccryptonite_p256_from_bin b p
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scalarToBinary :: ByteArray ba => Scalar -> ba
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scalarToBinary s = B.allocAndFreeze scalarSize $ \b -> withScalar s $ \p ->
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ccryptonite_p256_to_bin p b
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------------------------------------------------------------------------
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-- Memory Helpers
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------------------------------------------------------------------------
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withNewPoint :: (Ptr P256X -> Ptr P256Y -> IO ()) -> Point
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withNewPoint f = unsafeDoIO $ do
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(x,y) <- B.allocRet pointCoordSize $ \py -> B.alloc pointCoordSize $ \px -> f px py
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return $! Point x y
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where pointCoordSize = 32
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{-# NOINLINE withNewPoint #-}
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withPoint :: Point -> (Ptr P256X -> Ptr P256Y -> IO a) -> IO a
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withPoint (Point x y) f = B.withByteArray x $ \px -> B.withByteArray y $ \py -> f px py
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withNewScalarFreeze :: (Ptr P256Scalar -> IO ()) -> Scalar
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withNewScalarFreeze f = Scalar $ B.allocAndFreeze scalarSize f
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{-# NOINLINE withNewScalarFreeze #-}
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withScalar :: Scalar -> (Ptr P256Scalar -> IO a) -> IO a
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withScalar (Scalar d) f = B.withByteArray d f
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------------------------------------------------------------------------
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-- Foreign bindings
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------------------------------------------------------------------------
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foreign import ccall "&cryptonite_SECP256r1_n"
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ccryptonite_SECP256r1_n :: Ptr P256Scalar
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foreign import ccall "&cryptonite_SECP256r1_p"
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ccryptonite_SECP256r1_p :: Ptr P256Scalar
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foreign import ccall "&cryptonite_SECP256r1_b"
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ccryptonite_SECP256r1_b :: Ptr P256Scalar
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foreign import ccall "cryptonite_p256_init"
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ccryptonite_p256_init :: Ptr P256Scalar -> IO ()
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foreign import ccall "cryptonite_p256_clear"
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ccryptonite_p256_clear :: Ptr P256Scalar -> IO ()
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foreign import ccall "cryptonite_p256_add"
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ccryptonite_p256_add :: Ptr P256Scalar -> Ptr P256Scalar -> Ptr P256Scalar -> IO CInt
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foreign import ccall "cryptonite_p256_sub"
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ccryptonite_p256_sub :: Ptr P256Scalar -> Ptr P256Scalar -> Ptr P256Scalar -> IO CInt
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foreign import ccall "cryptonite_p256_cmp"
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ccryptonite_p256_cmp :: Ptr P256Scalar -> Ptr P256Scalar -> IO CInt
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foreign import ccall "cryptonite_p256_mod"
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ccryptonite_p256_mod :: Ptr P256Scalar -> Ptr P256Scalar -> Ptr P256Scalar -> IO ()
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foreign import ccall "cryptonite_p256_modmul"
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ccryptonite_p256_modmul :: Ptr P256Scalar -> Ptr P256Scalar -> P256Digit -> Ptr P256Scalar -> Ptr P256Scalar -> IO ()
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foreign import ccall "cryptonite_p256_modinv"
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ccryptonite_p256_modinv :: Ptr P256Scalar -> Ptr P256Scalar -> Ptr P256Scalar -> IO ()
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foreign import ccall "cryptonite_p256_modinv_vartime"
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ccryptonite_p256_modinv_vartime :: Ptr P256Scalar -> Ptr P256Scalar -> Ptr P256Scalar -> IO ()
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foreign import ccall "cryptonite_p256_base_point_mul"
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ccryptonite_p256_basepoint_mul :: Ptr P256Scalar
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-> Ptr P256X -> Ptr P256Y
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-> IO ()
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foreign import ccall "cryptonite_p256e_point_add"
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ccryptonite_p256e_point_add :: Ptr P256X -> Ptr P256Y
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-> Ptr P256X -> Ptr P256Y
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-> Ptr P256X -> Ptr P256Y
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-> IO ()
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foreign import ccall "cryptonite_p256_point_mul"
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ccryptonite_p256_point_mul :: Ptr P256Scalar
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-> Ptr P256X -> Ptr P256Y
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-> Ptr P256X -> Ptr P256Y
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-> IO ()
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foreign import ccall "cryptonite_p256_points_mul_vartime"
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ccryptonite_p256_points_mul_vartime :: Ptr P256Scalar -> Ptr P256Scalar
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-> Ptr P256X -> Ptr P256Y
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-> Ptr P256X -> Ptr P256Y
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-> IO ()
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foreign import ccall "cryptonite_p256_is_valid_point"
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ccryptonite_p256_is_valid_point :: Ptr P256X -> Ptr P256Y -> IO CInt
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foreign import ccall "cryptonite_p256_to_bin"
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ccryptonite_p256_to_bin :: Ptr P256Scalar -> Ptr Word8 -> IO ()
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foreign import ccall "cryptonite_p256_from_bin"
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ccryptonite_p256_from_bin :: Ptr Word8 -> Ptr P256Scalar -> IO ()
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