librustzcash-wrapper/src/lib.rs

@@ -612,9 +612,14 @@ pub extern "C" fn rust_wrapper_recover_seed(
 pub extern "C" fn rust_wrapper_sapling_spendingkey(
     input: *const u8,
     input_len: usize,
+    coin: u32,
+    acc_id: u32,
     out: *mut u8,
     out_len: &mut usize
     ){
+    let seed: Vec<u8> = marshall_from_haskell_var(input, input_len, RW);
+    let fake_response = "It's working";
+    marshall_to_haskell_var(&fake_response.as_bytes().to_vec(), out, out_len, RW);
     // - Retrieve parameters 
 
 //    let extsk  = sapling::spending_key(&seed[0..32], 

src/C/Zcash.chs

@@ -128,8 +128,8 @@ import ZcashHaskell.Types
 
 {# fun unsafe rust_wrapper_sapling_spendingkey as rustWrapperSaplingSpendingkey
      { toBorshVar* `BS.ByteString'&
-     , toBorshFixed Int
+     , `Int'
-     , toBorshFixed Int
+     , `Int'
      , getVarBuffer `Buffer (BS.ByteString)'&
      }
   -> `()'

src/ZcashHaskell/Sapling.hs

@@ -21,14 +21,15 @@ import C.Zcash
   ( rustWrapperIsShielded
   , rustWrapperSaplingCheck
   , rustWrapperSaplingNoteDecode
+  , rustWrapperSaplingSpendingkey
   , rustWrapperSaplingVkDecode
   , rustWrapperTxParse
-  , rustWrapperSaplingSpendingkey
   )
 import Data.Aeson
 import qualified Data.ByteString as BS
-import Data.ByteString.Lazy      as BL
+import Data.ByteString.Lazy as BL
 import Data.HexString (HexString(..), toBytes)
+import Data.Word
 import Foreign.Rust.Marshall.Variable
   ( withPureBorshVarBuffer
   , withPureBorshVarBuffer
@@ -37,12 +38,11 @@ import ZcashHaskell.Types
   ( DecodedNote(..)
   , RawData(..)
   , RawTxResponse(..)
+  , SaplingSKeyParams(..)
   , ShieldedOutput(..)
   , decodeHexText
-  , SaplingSKeyParams(..)
   )
 import ZcashHaskell.Utils
-import Data.Word
 
 -- | Check if given bytesting is a valid encoded shielded address
 isValidShieldedAddress :: BS.ByteString -> Bool
@@ -90,12 +90,12 @@ instance FromJSON RawTxResponse where
           pure $ RawTxResponse i h (getShieldedOutputs h) a ht c b
 
 -- | Attempts to obtain a sapling SpendinKey using a HDSeed, a Coin Type and an Account ID
-genSaplingSpendingKey ::
+genSaplingSpendingKey :: BS.ByteString -> Int -> Int -> Maybe BS.ByteString
-      BS.ByteString -> Word32 -> Word32 -> Maybe BS.ByteString
 genSaplingSpendingKey seed coin_type account_id = do
   if BS.length res > 0
     then Just res
     else Nothing
   where
-    res = (withPureBorshVarBuffer . rustWrapperSaplingSpendingkey) seed coin_type account_id 
+    res =
-
+      withPureBorshVarBuffer
+        (rustWrapperSaplingSpendingkey seed coin_type account_id)