{-# LANGUAGE MultiParamTypeClasses, FlexibleInstances #-}
module Crypto.Nettle.ChaChaPoly1305 (
chaChaPoly1305Encrypt
, chaChaPoly1305Decrypt
) where
import qualified Data.ByteString as B
import qualified Data.ByteString.Internal as B
import Data.SecureMem
import Crypto.Nettle.Ciphers.ForeignImports
import Nettle.Utils
chaChaPoly1305Encrypt
:: B.ByteString
-> B.ByteString
-> B.ByteString
-> B.ByteString
-> (B.ByteString, B.ByteString)
chaChaPoly1305Encrypt :: ByteString
-> ByteString
-> ByteString
-> ByteString
-> (ByteString, ByteString)
chaChaPoly1305Encrypt key :: ByteString
key nonce :: ByteString
nonce aad :: ByteString
aad plain :: ByteString
plain = IO (ByteString, ByteString) -> (ByteString, ByteString)
forall a. IO a -> a
unsafeDupablePerformIO (IO (ByteString, ByteString) -> (ByteString, ByteString))
-> IO (ByteString, ByteString) -> (ByteString, ByteString)
forall a b. (a -> b) -> a -> b
$ do
SecureMem
ctx <- Int -> IO SecureMem
allocateSecureMem Int
c_chacha_poly1305_ctx_size
ByteString
tag <- Int -> (Ptr Word8 -> IO ()) -> IO ByteString
B.create 16 (\_ -> () -> IO ()
forall (m :: * -> *) a. Monad m => a -> m a
return ())
ByteString
cipher <- Int -> (Ptr Word8 -> IO ()) -> IO ByteString
B.create (ByteString -> Int
B.length ByteString
plain) (\_ -> () -> IO ()
forall (m :: * -> *) a. Monad m => a -> m a
return ())
ByteString -> (Word -> Ptr Word8 -> IO ()) -> IO ()
forall a. ByteString -> (Word -> Ptr Word8 -> IO a) -> IO a
withByteStringPtr ByteString
plain ((Word -> Ptr Word8 -> IO ()) -> IO ())
-> (Word -> Ptr Word8 -> IO ()) -> IO ()
forall a b. (a -> b) -> a -> b
$ \psize :: Word
psize pptr :: Ptr Word8
pptr ->
ByteString -> (Word -> Ptr Word8 -> IO ()) -> IO ()
forall a. ByteString -> (Word -> Ptr Word8 -> IO a) -> IO a
withByteStringPtr ByteString
aad ((Word -> Ptr Word8 -> IO ()) -> IO ())
-> (Word -> Ptr Word8 -> IO ()) -> IO ()
forall a b. (a -> b) -> a -> b
$ \aadsize :: Word
aadsize aadptr :: Ptr Word8
aadptr ->
ByteString -> (Word -> Ptr Word8 -> IO ()) -> IO ()
forall a. ByteString -> (Word -> Ptr Word8 -> IO a) -> IO a
withByteStringPtr ByteString
cipher ((Word -> Ptr Word8 -> IO ()) -> IO ())
-> (Word -> Ptr Word8 -> IO ()) -> IO ()
forall a b. (a -> b) -> a -> b
$ \_ cipherptr :: Ptr Word8
cipherptr ->
ByteString -> (Word -> Ptr Word8 -> IO ()) -> IO ()
forall a. ByteString -> (Word -> Ptr Word8 -> IO a) -> IO a
withByteStringPtr ByteString
tag ((Word -> Ptr Word8 -> IO ()) -> IO ())
-> (Word -> Ptr Word8 -> IO ()) -> IO ()
forall a b. (a -> b) -> a -> b
$ \_ tagptr :: Ptr Word8
tagptr ->
SecureMem -> (Ptr Word8 -> IO ()) -> IO ()
forall b. SecureMem -> (Ptr Word8 -> IO b) -> IO b
withSecureMemPtr SecureMem
ctx ((Ptr Word8 -> IO ()) -> IO ()) -> (Ptr Word8 -> IO ()) -> IO ()
forall a b. (a -> b) -> a -> b
$ \ctxptr :: Ptr Word8
ctxptr ->
SecureMem -> (Int -> Ptr Word8 -> IO ()) -> IO ()
forall b. SecureMem -> (Int -> Ptr Word8 -> IO b) -> IO b
withSecureMemPtrSz (ByteString -> SecureMem
forall a. ToSecureMem a => a -> SecureMem
toSecureMem ByteString
key) ((Int -> Ptr Word8 -> IO ()) -> IO ())
-> (Int -> Ptr Word8 -> IO ()) -> IO ()
forall a b. (a -> b) -> a -> b
$ \ksize :: Int
ksize kptr :: Ptr Word8
kptr -> if Int
ksize Int -> Int -> Bool
forall a. Eq a => a -> a -> Bool
/= 32 then [Char] -> IO ()
forall a. HasCallStack => [Char] -> a
error "Invalid key length" else
SecureMem -> (Int -> Ptr Word8 -> IO ()) -> IO ()
forall b. SecureMem -> (Int -> Ptr Word8 -> IO b) -> IO b
withSecureMemPtrSz (ByteString -> SecureMem
forall a. ToSecureMem a => a -> SecureMem
toSecureMem ByteString
nonce) ((Int -> Ptr Word8 -> IO ()) -> IO ())
-> (Int -> Ptr Word8 -> IO ()) -> IO ()
forall a b. (a -> b) -> a -> b
$ \nsize :: Int
nsize nptr :: Ptr Word8
nptr -> if Int
nsize Int -> Int -> Bool
forall a. Eq a => a -> a -> Bool
/= 12 then [Char] -> IO ()
forall a. HasCallStack => [Char] -> a
error "Invalid nonce length" else do
Ptr Word8 -> Ptr Word8 -> IO ()
c_chacha_poly1305_set_key Ptr Word8
ctxptr Ptr Word8
kptr
Ptr Word8 -> Ptr Word8 -> IO ()
c_chacha_poly1305_set_nonce Ptr Word8
ctxptr Ptr Word8
nptr
Ptr Word8 -> Word -> Ptr Word8 -> IO ()
c_chacha_poly1305_update Ptr Word8
ctxptr Word
aadsize Ptr Word8
aadptr
NettleCryptFunc
c_chacha_poly1305_encrypt Ptr Word8
ctxptr Word
psize Ptr Word8
cipherptr Ptr Word8
pptr
Ptr Word8 -> Word -> Ptr Word8 -> IO ()
c_chacha_poly1305_digest Ptr Word8
ctxptr 16 Ptr Word8
tagptr
(ByteString, ByteString) -> IO (ByteString, ByteString)
forall (m :: * -> *) a. Monad m => a -> m a
return (ByteString
cipher, ByteString
tag)
chaChaPoly1305Decrypt :: B.ByteString -> B.ByteString -> B.ByteString -> B.ByteString -> B.ByteString -> Maybe B.ByteString
chaChaPoly1305Decrypt :: ByteString
-> ByteString
-> ByteString
-> ByteString
-> ByteString
-> Maybe ByteString
chaChaPoly1305Decrypt key :: ByteString
key nonce :: ByteString
nonce aad :: ByteString
aad cipher :: ByteString
cipher verifytag :: ByteString
verifytag = IO (Maybe ByteString) -> Maybe ByteString
forall a. IO a -> a
unsafeDupablePerformIO (IO (Maybe ByteString) -> Maybe ByteString)
-> IO (Maybe ByteString) -> Maybe ByteString
forall a b. (a -> b) -> a -> b
$ do
SecureMem
ctx <- Int -> IO SecureMem
allocateSecureMem Int
c_chacha_poly1305_ctx_size
ByteString
tag <- Int -> (Ptr Word8 -> IO ()) -> IO ByteString
B.create 16 (\_ -> () -> IO ()
forall (m :: * -> *) a. Monad m => a -> m a
return ())
ByteString
plain <- Int -> (Ptr Word8 -> IO ()) -> IO ByteString
B.create (ByteString -> Int
B.length ByteString
cipher) (\_ -> () -> IO ()
forall (m :: * -> *) a. Monad m => a -> m a
return ())
ByteString -> (Word -> Ptr Word8 -> IO ()) -> IO ()
forall a. ByteString -> (Word -> Ptr Word8 -> IO a) -> IO a
withByteStringPtr ByteString
cipher ((Word -> Ptr Word8 -> IO ()) -> IO ())
-> (Word -> Ptr Word8 -> IO ()) -> IO ()
forall a b. (a -> b) -> a -> b
$ \psize :: Word
psize pptr :: Ptr Word8
pptr ->
ByteString -> (Word -> Ptr Word8 -> IO ()) -> IO ()
forall a. ByteString -> (Word -> Ptr Word8 -> IO a) -> IO a
withByteStringPtr ByteString
aad ((Word -> Ptr Word8 -> IO ()) -> IO ())
-> (Word -> Ptr Word8 -> IO ()) -> IO ()
forall a b. (a -> b) -> a -> b
$ \aadsize :: Word
aadsize aadptr :: Ptr Word8
aadptr ->
ByteString -> (Word -> Ptr Word8 -> IO ()) -> IO ()
forall a. ByteString -> (Word -> Ptr Word8 -> IO a) -> IO a
withByteStringPtr ByteString
plain ((Word -> Ptr Word8 -> IO ()) -> IO ())
-> (Word -> Ptr Word8 -> IO ()) -> IO ()
forall a b. (a -> b) -> a -> b
$ \_ plainptr :: Ptr Word8
plainptr ->
ByteString -> (Word -> Ptr Word8 -> IO ()) -> IO ()
forall a. ByteString -> (Word -> Ptr Word8 -> IO a) -> IO a
withByteStringPtr ByteString
tag ((Word -> Ptr Word8 -> IO ()) -> IO ())
-> (Word -> Ptr Word8 -> IO ()) -> IO ()
forall a b. (a -> b) -> a -> b
$ \_ tagptr :: Ptr Word8
tagptr ->
SecureMem -> (Ptr Word8 -> IO ()) -> IO ()
forall b. SecureMem -> (Ptr Word8 -> IO b) -> IO b
withSecureMemPtr SecureMem
ctx ((Ptr Word8 -> IO ()) -> IO ()) -> (Ptr Word8 -> IO ()) -> IO ()
forall a b. (a -> b) -> a -> b
$ \ctxptr :: Ptr Word8
ctxptr ->
SecureMem -> (Int -> Ptr Word8 -> IO ()) -> IO ()
forall b. SecureMem -> (Int -> Ptr Word8 -> IO b) -> IO b
withSecureMemPtrSz (ByteString -> SecureMem
forall a. ToSecureMem a => a -> SecureMem
toSecureMem ByteString
key) ((Int -> Ptr Word8 -> IO ()) -> IO ())
-> (Int -> Ptr Word8 -> IO ()) -> IO ()
forall a b. (a -> b) -> a -> b
$ \ksize :: Int
ksize kptr :: Ptr Word8
kptr -> if Int
ksize Int -> Int -> Bool
forall a. Eq a => a -> a -> Bool
/= 32 then [Char] -> IO ()
forall a. HasCallStack => [Char] -> a
error "Invalid key length" else
SecureMem -> (Int -> Ptr Word8 -> IO ()) -> IO ()
forall b. SecureMem -> (Int -> Ptr Word8 -> IO b) -> IO b
withSecureMemPtrSz (ByteString -> SecureMem
forall a. ToSecureMem a => a -> SecureMem
toSecureMem ByteString
nonce) ((Int -> Ptr Word8 -> IO ()) -> IO ())
-> (Int -> Ptr Word8 -> IO ()) -> IO ()
forall a b. (a -> b) -> a -> b
$ \nsize :: Int
nsize nptr :: Ptr Word8
nptr -> if Int
nsize Int -> Int -> Bool
forall a. Eq a => a -> a -> Bool
/= 12 then [Char] -> IO ()
forall a. HasCallStack => [Char] -> a
error "Invalid nonce length" else do
Ptr Word8 -> Ptr Word8 -> IO ()
c_chacha_poly1305_set_key Ptr Word8
ctxptr Ptr Word8
kptr
Ptr Word8 -> Ptr Word8 -> IO ()
c_chacha_poly1305_set_nonce Ptr Word8
ctxptr Ptr Word8
nptr
Ptr Word8 -> Word -> Ptr Word8 -> IO ()
c_chacha_poly1305_update Ptr Word8
ctxptr Word
aadsize Ptr Word8
aadptr
NettleCryptFunc
c_chacha_poly1305_decrypt Ptr Word8
ctxptr Word
psize Ptr Word8
plainptr Ptr Word8
pptr
Ptr Word8 -> Word -> Ptr Word8 -> IO ()
c_chacha_poly1305_digest Ptr Word8
ctxptr 16 Ptr Word8
tagptr
if Int -> ByteString -> ByteString
B.take (ByteString -> Int
B.length ByteString
verifytag) ByteString
tag ByteString -> ByteString -> Bool
forall a. Eq a => a -> a -> Bool
== ByteString
verifytag then Maybe ByteString -> IO (Maybe ByteString)
forall (m :: * -> *) a. Monad m => a -> m a
return (Maybe ByteString -> IO (Maybe ByteString))
-> Maybe ByteString -> IO (Maybe ByteString)
forall a b. (a -> b) -> a -> b
$ ByteString -> Maybe ByteString
forall a. a -> Maybe a
Just ByteString
plain else Maybe ByteString -> IO (Maybe ByteString)
forall (m :: * -> *) a. Monad m => a -> m a
return Maybe ByteString
forall a. Maybe a
Nothing