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implementing ecdh fpr P256 and P521.

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This commit is contained in:
Kazu Yamamoto 2016-11-15 15:41:00 +09:00
parent c29fa82417
commit 9a0ec9166a
1 changed files with 15 additions and 1 deletions
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16
Crypto/ECC.hs
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@ -25,6 +25,7 @@ import qualified Crypto.PubKey.ECC.Prim as H
import Crypto.Random
import Crypto.Internal.Imports
import Crypto.Internal.ByteArray (ByteArrayAccess, ScrubbedBytes)
import Crypto.Number.Serialize (i2ospOf_)
import Data.Function (on)
-- | An elliptic curve key pair composed of the private part (a scalar), and
@ -97,11 +98,17 @@ instance EllipticCurve Curve_P256R1 where
curveGenerateScalar = P256Scalar <$> P256.scalarGenerate
curveGenerateKeyPair = toKeyPair <$> P256.scalarGenerate
where toKeyPair scalar = KeyPair (P256Point $ P256.toPoint scalar) (P256Scalar scalar)
instance EllipticCurveArith Curve_P256R1 where
pointAdd a b = P256Point $ (P256.pointAdd `on` unP256Point) a b
pointSmul s p = P256Point $ P256.pointMul (unP256Scalar s) (unP256Point p)
instance EllipticCurveDH Curve_P256R1 where
ecdh s p = undefined
ecdh s p = shared
where
(x, _) = P256.pointToIntegers $ unP256Point $ pointSmul s p
len = (256 + 7) `div` 8
shared = SharedSecret $ i2ospOf_ len x
data Curve_P521R1 = Curve_P521R1
@ -115,7 +122,14 @@ instance EllipticCurve Curve_P521R1 where
curveGenerateScalar = P521Scalar <$> H.scalarGenerate (H.getCurveByName H.SEC_p521r1)
curveGenerateKeyPair = toKeyPair <$> H.scalarGenerate (H.getCurveByName H.SEC_p521r1)
where toKeyPair scalar = KeyPair (P521Point $ H.pointBaseMul (H.getCurveByName H.SEC_p521r1) scalar) (P521Scalar scalar)
instance EllipticCurveArith Curve_P521R1 where
pointAdd a b = P521Point $ (H.pointAdd (H.getCurveByName H.SEC_p521r1) `on` unP521Point) a b
pointSmul s p = P521Point (H.pointMul (H.getCurveByName H.SEC_p521r1) (unP521Scalar s) (unP521Point p))
instance EllipticCurveDH Curve_P521R1 where
ecdh s p = shared
where
H.Point x _ = unP521Point $ pointSmul s p
len = (521 + 7) `div` 8
shared = SharedSecret $ i2ospOf_ len x