module EVM.Sign where
import Data.ByteString qualified as BS
import Data.Maybe (fromMaybe)
import Data.Word
import Crypto.Hash qualified as Crypto
import Crypto.PubKey.ECC.ECDSA (signDigestWith, PrivateKey(..), Signature(..))
import Crypto.PubKey.ECC.Types (getCurveByName, CurveName(..), Point(..))
import Crypto.PubKey.ECC.Generate (generateQ)
import Witch (unsafeInto)
import EVM.ABI (encodeAbiValue, AbiValue(..))
import EVM.Types
import EVM.Expr (exprToAddr)
import EVM.Precompiled
deriveAddr :: Integer -> Maybe Addr
deriveAddr :: Integer -> Maybe Addr
deriveAddr Integer
sk =
case Point
pubPoint of
Point
PointO -> Maybe Addr
forall a. Maybe a
Nothing
Point Integer
x Integer
y ->
let pub :: ByteString
pub = [ByteString] -> ByteString
BS.concat [ Integer -> ByteString
encodeInt Integer
x, Integer -> ByteString
encodeInt Integer
y ]
addr :: Expr 'EWord
addr = W256 -> Expr 'EWord
Lit (W256 -> Expr 'EWord)
-> (ByteString -> W256) -> ByteString -> Expr 'EWord
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Word256 -> W256
W256 (Word256 -> W256) -> (ByteString -> Word256) -> ByteString -> W256
forall b c a. (b -> c) -> (a -> b) -> a -> c
. ByteString -> Word256
word256 (ByteString -> Word256)
-> (ByteString -> ByteString) -> ByteString -> Word256
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Int -> ByteString -> ByteString
BS.drop Int
12 (ByteString -> ByteString)
-> (ByteString -> ByteString) -> ByteString -> ByteString
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Int -> ByteString -> ByteString
BS.take Int
32 (ByteString -> ByteString)
-> (ByteString -> ByteString) -> ByteString -> ByteString
forall b c a. (b -> c) -> (a -> b) -> a -> c
. ByteString -> ByteString
keccakBytes (ByteString -> Expr 'EWord) -> ByteString -> Expr 'EWord
forall a b. (a -> b) -> a -> b
$ ByteString
pub
in Expr 'EWord -> Maybe Addr
exprToAddr Expr 'EWord
addr
where
curve :: Curve
curve = CurveName -> Curve
getCurveByName CurveName
SEC_p256k1
pubPoint :: Point
pubPoint = Curve -> Integer -> Point
generateQ Curve
curve Integer
sk
encodeInt :: Integer -> ByteString
encodeInt = AbiValue -> ByteString
encodeAbiValue (AbiValue -> ByteString)
-> (Integer -> AbiValue) -> Integer -> ByteString
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Int -> Word256 -> AbiValue
AbiUInt Int
256 (Word256 -> AbiValue)
-> (Integer -> Word256) -> Integer -> AbiValue
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Integer -> Word256
forall a. Num a => Integer -> a
fromInteger
sign :: W256 -> Integer -> (Word8, W256, W256)
sign :: W256 -> Integer -> (Word8, W256, W256)
sign W256
hash Integer
sk = (Word8
v, W256
r, W256
s)
where
curve :: Curve
curve = CurveName -> Curve
getCurveByName CurveName
SEC_p256k1
priv :: PrivateKey
priv = Curve -> Integer -> PrivateKey
PrivateKey Curve
curve Integer
sk
digest :: Digest Keccak_256
digest = Digest Keccak_256 -> Maybe (Digest Keccak_256) -> Digest Keccak_256
forall a. a -> Maybe a -> a
fromMaybe
([Char] -> Digest Keccak_256
forall a. HasCallStack => [Char] -> a
internalError ([Char] -> Digest Keccak_256) -> [Char] -> Digest Keccak_256
forall a b. (a -> b) -> a -> b
$ [Char]
"could produce a digest from " [Char] -> [Char] -> [Char]
forall a. Semigroup a => a -> a -> a
<> W256 -> [Char]
forall a. Show a => a -> [Char]
show W256
hash)
(ByteString -> Maybe (Digest Keccak_256)
forall a ba.
(HashAlgorithm a, ByteArrayAccess ba) =>
ba -> Maybe (Digest a)
Crypto.digestFromByteString (W256 -> ByteString
word256Bytes W256
hash))
sig :: Signature
sig = PrivateKey -> Digest Keccak_256 -> Signature
ethsign PrivateKey
priv Digest Keccak_256
digest
r :: W256
r = Integer -> W256
forall target source.
(HasCallStack, TryFrom source target, Show source, Typeable source,
Typeable target) =>
source -> target
unsafeInto (Integer -> W256) -> Integer -> W256
forall a b. (a -> b) -> a -> b
$ Signature -> Integer
sign_r Signature
sig
s :: W256
s = Integer -> W256
forall target source.
(HasCallStack, TryFrom source target, Show source, Typeable source,
Typeable target) =>
source -> target
unsafeInto Integer
lowS
v :: Word8
v = if W256 -> W256 -> W256 -> W256 -> Maybe Addr
ecrec W256
28 W256
r W256
s W256
hash Maybe Addr -> Maybe Addr -> Bool
forall a. Eq a => a -> a -> Bool
== Integer -> Maybe Addr
deriveAddr Integer
sk
then Word8
28
else Word8
27
secpOrder :: Integer
secpOrder = Integer
0xfffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141 :: Integer
lowS :: Integer
lowS = if Signature -> Integer
sign_s Signature
sig Integer -> Integer -> Bool
forall a. Ord a => a -> a -> Bool
> Integer
secpOrder Integer -> Integer -> Integer
forall a. Integral a => a -> a -> a
`div` Integer
2
then Integer
secpOrder Integer -> Integer -> Integer
forall a. Num a => a -> a -> a
- Signature -> Integer
sign_s Signature
sig
else Signature -> Integer
sign_s Signature
sig
ethsign :: PrivateKey -> Crypto.Digest Crypto.Keccak_256 -> Signature
ethsign :: PrivateKey -> Digest Keccak_256 -> Signature
ethsign PrivateKey
sk Digest Keccak_256
digest = Integer -> Signature
go Integer
420
where
go :: Integer -> Signature
go Integer
k = case Integer -> PrivateKey -> Digest Keccak_256 -> Maybe Signature
forall hash.
HashAlgorithm hash =>
Integer -> PrivateKey -> Digest hash -> Maybe Signature
signDigestWith Integer
k PrivateKey
sk Digest Keccak_256
digest of
Maybe Signature
Nothing -> Integer -> Signature
go (Integer
k Integer -> Integer -> Integer
forall a. Num a => a -> a -> a
+ Integer
1)
Just Signature
sig -> Signature
sig
ecrec :: W256 -> W256 -> W256 -> W256 -> Maybe Addr
ecrec :: W256 -> W256 -> W256 -> W256 -> Maybe Addr
ecrec W256
v W256
r W256
s W256
e = W256 -> Addr
forall target source.
(HasCallStack, TryFrom source target, Show source, Typeable source,
Typeable target) =>
source -> target
unsafeInto (W256 -> Addr) -> (ByteString -> W256) -> ByteString -> Addr
forall b c a. (b -> c) -> (a -> b) -> a -> c
. ByteString -> W256
word (ByteString -> Addr) -> Maybe ByteString -> Maybe Addr
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Int -> ByteString -> Int -> Maybe ByteString
EVM.Precompiled.execute Int
1 ByteString
input Int
32
where input :: ByteString
input = [ByteString] -> ByteString
BS.concat (W256 -> ByteString
word256Bytes (W256 -> ByteString) -> [W256] -> [ByteString]
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> [W256
e, W256
v, W256
r, W256
s])