module Crypto.Secp256k1.Internal where
import Control.Monad
import Data.Binary (Binary, get, put)
import Data.Binary.Get (runGet)
import Data.Binary.Put (runPut)
import Data.ByteString (ByteString, packCStringLen)
import Data.ByteString.Lazy (fromStrict, toStrict)
import Data.ByteString.Unsafe (unsafePackCStringLen,
unsafeUseAsCStringLen)
import Data.LargeWord (LargeKey (LargeKey), Word256)
import Foreign
import Foreign.C
import System.Entropy
import System.IO.Unsafe
data Ctx = Ctx
newtype PubKey64 = PubKey64 { getPubKey64 :: ByteString }
deriving (Read, Show, Eq, Ord)
newtype Msg32 = Msg32 { getMsg32 :: ByteString }
deriving (Read, Show, Eq, Ord)
newtype Sig64 = Sig64 { getSig64 :: ByteString }
deriving (Read, Show, Eq, Ord)
data CompactSig =
CompactSig
{ getCompactSigR :: Word256
, getCompactSigS :: Word256
}
deriving (Show, Eq, Ord)
newtype Seed32 = Seed32 { getSeed32 :: ByteString }
deriving (Read, Show, Eq, Ord)
newtype SecKey32 = SecKey32 { getSecKey32 :: ByteString }
deriving (Read, Show, Eq, Ord)
newtype Tweak32 = Tweak32 { getTweak32 :: ByteString }
deriving (Read, Show, Eq, Ord)
newtype Nonce32 = Nonce32 { getNonce32 :: ByteString }
deriving (Read, Show, Eq, Ord)
newtype Algo16 = Algo16 { getAlgo16 :: ByteString }
deriving (Read, Show, Eq, Ord)
newtype CtxFlags = CtxFlags { getCtxFlags :: CUInt }
deriving (Read, Show, Eq, Ord)
newtype SerFlags = SerFlags { getSerFlags :: CUInt }
deriving (Read, Show, Eq, Ord)
newtype Ret = Ret { getRet :: CInt }
deriving (Read, Show, Eq, Ord)
type NonceFunction a
= Ptr Nonce32
-> Ptr Msg32
-> Ptr SecKey32
-> Ptr Algo16
-> Ptr a
-> CUInt
-> Ret
verify :: CtxFlags
verify = CtxFlags 1
sign :: CtxFlags
sign = CtxFlags 2
signVerify :: CtxFlags
signVerify = CtxFlags 3
compressed :: SerFlags
compressed = SerFlags 1
uncompressed :: SerFlags
uncompressed = SerFlags 0
useByteString :: ByteString -> ((Ptr CUChar, CSize) -> IO a) -> IO a
useByteString bs f =
unsafeUseAsCStringLen bs $ \(b, l) -> f (castPtr b, fromIntegral l)
packByteString :: (Ptr CUChar, CSize) -> IO ByteString
packByteString (b, l) = packCStringLen (castPtr b, fromIntegral l)
instance Storable PubKey64 where
sizeOf _ = 64
alignment _ = 1
peek p = PubKey64 <$> packByteString (castPtr p, 64)
poke p (PubKey64 k) = useByteString k $
\(b, _) -> copyArray (castPtr p) b 64
instance Storable Sig64 where
sizeOf _ = 64
alignment _ = 1
peek p = Sig64 <$> packByteString (castPtr p, 64)
poke p (Sig64 k) = useByteString k $
\(b, _) -> copyArray (castPtr p) b 64
instance Storable CompactSig where
sizeOf _ = 64
alignment _ = 1
peek p = (runGet get . fromStrict) <$> unsafePackCStringLen (castPtr p, 64)
poke p cs = useByteString bs $ \(b, _) -> copyArray (castPtr p) b 64 where
bs = toStrict $ runPut $ put cs
instance Binary CompactSig where
get = do
LargeKey r s <- get
return $ CompactSig r s
put (CompactSig r s) = put (LargeKey r s)
instance Storable Msg32 where
sizeOf _ = 32
alignment _ = 1
peek p = Msg32 <$> packByteString (castPtr p, 32)
poke p (Msg32 k) = useByteString k $
\(b, _) -> copyArray (castPtr p) b 32
instance Storable Seed32 where
sizeOf _ = 32
alignment _ = 1
peek p = Seed32 <$> packByteString (castPtr p, 32)
poke p (Seed32 k) = useByteString k $
\(b, _) -> copyArray (castPtr p) b 32
instance Storable SecKey32 where
sizeOf _ = 32
alignment _ = 1
peek p = SecKey32 <$> packByteString (castPtr p, 32)
poke p (SecKey32 k) = useByteString k $
\(b, _) -> copyArray (castPtr p) b 32
instance Storable Tweak32 where
sizeOf _ = 32
alignment _ = 1
peek p = Tweak32 <$> packByteString (castPtr p, 32)
poke p (Tweak32 k) = useByteString k $
\(b, _) -> copyArray (castPtr p) b 32
instance Storable Nonce32 where
sizeOf _ = 32
alignment _ = 1
peek p = Nonce32 <$> packByteString (castPtr p, 32)
poke p (Nonce32 k) = useByteString k $
\(b, _) -> copyArray (castPtr p) b 32
instance Storable Algo16 where
sizeOf _ = 16
alignment _ = 1
peek p = Algo16 <$> packByteString (castPtr p, 16)
poke p (Algo16 k) = useByteString k $
\(b, _) -> copyArray (castPtr p) b 16
isSuccess :: Ret -> Bool
isSuccess (Ret 0) = False
isSuccess (Ret 1) = True
isSuccess _ = undefined
ctx :: Ptr Ctx
ctx = unsafePerformIO $ do
x <- contextCreate signVerify
e <- getEntropy 32
ret <- alloca $ \s -> poke s (Seed32 e) >> contextRandomize x s
unless (isSuccess ret) $ error "failed to randomize context"
return x
foreign import ccall
"secp256k1.h secp256k1_context_create"
contextCreate
:: CtxFlags
-> IO (Ptr Ctx)
foreign import ccall
"secp256k1.h secp256k1_context_clone"
contextClone
:: Ptr Ctx
-> IO (Ptr Ctx)
foreign import ccall
"secp256k1.h &secp256k1_context_destroy"
contextDestroy
:: FunPtr (Ptr Ctx -> IO ())
foreign import ccall
"secp256k1.h secp256k1_context_set_illegal_callback"
setIllegalCallback
:: Ptr Ctx
-> FunPtr (CString -> Ptr a -> IO ())
-> Ptr a
-> IO ()
foreign import ccall
"secp256k1.h secp256k1_context_set_error_callback"
setErrorCallback
:: Ptr Ctx
-> FunPtr (CString -> Ptr a -> IO ())
-> Ptr a
-> IO ()
foreign import ccall
"secp256k1.h secp256k1_ec_pubkey_parse"
ecPubKeyParse
:: Ptr Ctx
-> Ptr PubKey64
-> Ptr CUChar
-> CSize
-> IO Ret
foreign import ccall
"secp256k1.h secp256k1_ec_pubkey_serialize"
ecPubKeySerialize
:: Ptr Ctx
-> Ptr CUChar
-> Ptr CSize
-> Ptr PubKey64
-> SerFlags
-> IO Ret
foreign import ccall
"secp256k1.h secp256k1_ecdsa_signature_parse_compact"
ecdsaSignatureParseCompact
:: Ptr Ctx
-> Ptr Sig64
-> Ptr CompactSig
-> IO Ret
foreign import ccall
"secp256k1.h secp256k1_ecdsa_signature_parse_der"
ecdsaSignatureParseDer
:: Ptr Ctx
-> Ptr Sig64
-> Ptr CUChar
-> CSize
-> IO Ret
foreign import ccall
"secp256k1.h secp256k1_ecdsa_signature_serialize_der"
ecdsaSignatureSerializeDer
:: Ptr Ctx
-> Ptr CUChar
-> Ptr CSize
-> Ptr Sig64
-> IO Ret
foreign import ccall
"secp256k1.h secp256k1_ecdsa_signature_serialize_compact"
ecdsaSignatureSerializeCompact
:: Ptr Ctx
-> Ptr CompactSig
-> Ptr Sig64
-> IO Ret
foreign import ccall
"secp256k1.h secp256k1_ecdsa_verify"
ecdsaVerify
:: Ptr Ctx
-> Ptr Sig64
-> Ptr Msg32
-> Ptr PubKey64
-> IO Ret
foreign import ccall
"secp256k1.h secp256k1_ecdsa_signature_normalize"
ecdsaSignatureNormalize
:: Ptr Ctx
-> Ptr Sig64
-> Ptr Sig64
-> IO Ret
foreign import ccall
"lax_der.h lax_der_parse"
laxDerParse
:: Ptr Ctx
-> Ptr Sig64
-> Ptr CUChar
-> CSize
-> IO Ret
foreign import ccall
"secp256k1.h secp256k1_ecdsa_sign"
ecdsaSign
:: Ptr Ctx
-> Ptr Sig64
-> Ptr Msg32
-> Ptr SecKey32
-> FunPtr (NonceFunction a)
-> Ptr a
-> IO Ret
foreign import ccall
"secp256k1.h secp256k1_ec_seckey_verify"
ecSecKeyVerify
:: Ptr Ctx
-> Ptr SecKey32
-> IO Ret
foreign import ccall
"secp256k1.h secp256k1_ec_pubkey_create"
ecPubKeyCreate
:: Ptr Ctx
-> Ptr PubKey64
-> Ptr SecKey32
-> IO Ret
foreign import ccall
"secp256k1.h secp256k1_ec_privkey_export"
ecSecKeyExport
:: Ptr Ctx
-> Ptr CUChar
-> Ptr CSize
-> Ptr SecKey32
-> SerFlags
-> IO Ret
foreign import ccall
"secp256k1.h secp256k1_ec_privkey_import"
ecSecKeyImport
:: Ptr Ctx
-> Ptr SecKey32
-> Ptr CUChar
-> CSize
-> IO Ret
foreign import ccall
"secp256k1.h secp256k1_ec_privkey_tweak_add"
ecSecKeyTweakAdd
:: Ptr Ctx
-> Ptr SecKey32
-> Ptr Tweak32
-> IO Ret
foreign import ccall
"secp256k1.h secp256k1_ec_pubkey_tweak_add"
ecPubKeyTweakAdd
:: Ptr Ctx
-> Ptr PubKey64
-> Ptr Tweak32
-> IO Ret
foreign import ccall
"secp256k1.h secp256k1_ec_privkey_tweak_mul"
ecSecKeyTweakMul
:: Ptr Ctx
-> Ptr SecKey32
-> Ptr Tweak32
-> IO Ret
foreign import ccall
"secp256k1.h secp256k1_ec_pubkey_tweak_mul"
ecPubKeyTweakMul
:: Ptr Ctx
-> Ptr PubKey64
-> Ptr Tweak32
-> IO Ret
foreign import ccall
"secp256k1.h secp256k1_context_randomize"
contextRandomize
:: Ptr Ctx
-> Ptr Seed32
-> IO Ret
foreign import ccall
"secp256k1.h secp256k1_ec_pubkey_combine"
ecPubKeyCombine
:: Ptr Ctx
-> Ptr PubKey64
-> Ptr (Ptr PubKey64)
-> CInt
-> IO Ret