37 lines
1.3 KiB
Haskell
37 lines
1.3 KiB
Haskell
-- |
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-- Module : Crypto.PubKey.ECIES
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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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-- IES with Elliptic curve <https://en.wikipedia.org/wiki/Integrated_Encryption_Scheme>
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--
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module Crypto.PubKey.ECIES
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( deriveEncrypt
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, deriveDecrypt
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) where
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import Crypto.ECC
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import Crypto.Random
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import Crypto.Internal.Proxy
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-- | Generate random a new Shared secret and the associated point
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-- to do a ECIES style encryption
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deriveEncrypt :: (MonadRandom randomly, EllipticCurveDH curve)
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=> proxy curve -- ^ representation of the curve
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-> Point curve -- ^ the public key of the receiver
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-> randomly (Point curve, SharedSecret)
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deriveEncrypt proxy pub = do
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(KeyPair rPoint rScalar) <- curveGenerateKeyPair proxy
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return (rPoint, ecdh proxy rScalar pub)
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-- | Derive the shared secret with the receiver key
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-- and the R point of the scheme.
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deriveDecrypt :: EllipticCurveDH curve
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=> proxy curve -- ^ representation of the curve
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-> Point curve -- ^ The received R (supposedly, randomly generated on the encrypt side)
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-> Scalar curve -- ^ The secret key of the receiver
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-> SharedSecret
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deriveDecrypt proxy point secret = ecdh proxy secret point
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