Add witness update functionality

CHANGELOG.md

@@ -5,14 +5,21 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.5.5.4]
+
+### Added
+
+- Functions to update Sapling witnesses.
+- Functions to update Orchard witnesses.
+
 ## [0.5.5.3]
 
 ### Added
 
-- Added unction to generate an ExchangeAddress in Human Readable Format Using a TransparentAddress in HRF
+- Added function to generate an `ExchangeAddress` in Human Readable Format Using a `TransparentAddress` in HRF
-  `encodeExchangeAddress` a function to create a ExchangeAddress in HRF 
+- `encodeExchangeAddress` a function to create a `ExchangeAddress` in HRF 
-  `decodeExchangeAddress` a function to obtaina a TransparentAddress object from an ExchangeAddress in HRF
+- `decodeExchangeAddress` a function to obtain a `TransparentAddress` object from an `ExchangeAddress` in HRF
-- Added new type ExchangeAddress 
+- Added new type `ExchangeAddress` 
 
 ### Fixed
 

librustzcash-wrapper/src/lib.rs

@@ -1251,6 +1251,40 @@ pub extern "C" fn rust_wrapper_read_sapling_position(
     return u64::from(pos);
 }
 
+#[no_mangle]
+pub extern "C" fn rust_wrapper_update_sapling_witness(
+    wit: *const u8,
+    wit_len: usize,
+    cmus: *const u8,
+    cmus_len: usize,
+    out: *mut u8,
+    out_len: &mut usize
+    ) {
+    let wit_in: Vec<u8> = marshall_from_haskell_var(wit, wit_len, RW);
+    let wit_reader = Cursor::new(wit_in);
+    let mut iw: IncrementalWitness<Node, SAPLING_DEPTH> = read_incremental_witness(wit_reader).unwrap();
+    let cmu: Vec<Vec<u8>> = marshall_from_haskell_var(cmus, cmus_len, RW);
+    for c in cmu {
+        let sap_note_comm = SaplingNoteCommitment::from_bytes(&to_array(c));
+        if sap_note_comm.is_some().into() {
+            let n = Node::from_cmu(&sap_note_comm.unwrap());
+            iw.append(n);
+        }
+    }
+    let mut out_bytes: Vec<u8> = Vec::new();
+    let result = write_incremental_witness(&iw, &mut out_bytes);
+    match result {
+        Ok(()) => {
+            let h = Hhex { bytes: out_bytes};
+            marshall_to_haskell_var(&h, out, out_len, RW);
+        },
+        Err(_e) => {
+            let h0 = Hhex { bytes: vec![0]};
+            marshall_to_haskell_var(&h0, out, out_len, RW);
+        }
+    }
+}
+
 #[no_mangle]
 pub extern "C" fn rust_wrapper_read_orchard_commitment_tree(
     tree: *const u8,
@@ -1340,6 +1374,40 @@ pub extern "C" fn rust_wrapper_read_orchard_position(
     }
 }
 
+#[no_mangle]
+pub extern "C" fn rust_wrapper_update_orchard_witness(
+    wit: *const u8,
+    wit_len: usize,
+    cm: *const u8,
+    cm_len: usize,
+    out: *mut u8,
+    out_len: &mut usize
+    ) {
+    let wit_in: Vec<u8> = marshall_from_haskell_var(wit, wit_len, RW);
+    let wit_reader = Cursor::new(wit_in);
+    let mut iw: IncrementalWitness<MerkleHashOrchard, 32> = read_incremental_witness(wit_reader).unwrap();
+    let cmu: Vec<Vec<u8>> = marshall_from_haskell_var(cm, cm_len, RW);
+    for c in cmu {
+            let orchard_note_comm = ExtractedNoteCommitment::from_bytes(&to_array(c));
+            if orchard_note_comm.is_some().into() {
+                let n = MerkleHashOrchard::from_cmx(&orchard_note_comm.unwrap());
+                iw.append(n);
+            }
+            let mut out_bytes: Vec<u8> = Vec::new();
+            let result = write_incremental_witness(&iw, &mut out_bytes);
+            match result {
+                Ok(()) => {
+                    let h = Hhex { bytes: out_bytes};
+                    marshall_to_haskell_var(&h, out, out_len, RW);
+                },
+                Err(_e) => {
+                    let h0 = Hhex { bytes: vec![0]};
+                    marshall_to_haskell_var(&h0, out, out_len, RW);
+                }
+            }
+    }
+}
+
 #[no_mangle]
 pub extern "C" fn rust_wrapper_decode_sapling_address(
     sapling: *const u8,

src/C/Zcash.chs

@@ -259,3 +259,19 @@ import ZcashHaskell.Types
      }
   -> `Word64'
 #}
+
+{# fun unsafe rust_wrapper_update_sapling_witness as rustWrapperUpdateSaplingWitness
+     { toBorshVar* `BS.ByteString'&
+     , toBorshVar* `[BS.ByteString]'&
+     , getVarBuffer `Buffer HexString'&
+     }
+  -> `()'
+#}
+
+{# fun unsafe rust_wrapper_update_orchard_witness as rustWrapperUpdateOrchardWitness
+     { toBorshVar* `BS.ByteString'&
+     , toBorshVar* `[BS.ByteString]'&
+     , getVarBuffer `Buffer HexString'&
+     }
+  -> `()'
+#}

src/ZcashHaskell/Orchard.hs

@@ -28,6 +28,7 @@ import C.Zcash
   , rustWrapperReadOrchardWitness
   , rustWrapperUADecode
   , rustWrapperUfvkDecode
+  , rustWrapperUpdateOrchardWitness
   )
 import qualified Data.ByteString as BS
 import qualified Data.ByteString.Char8 as C
@@ -219,3 +220,9 @@ getOrchardWitness tree =
 getOrchardNotePosition :: OrchardWitness -> Integer
 getOrchardNotePosition =
   fromIntegral . rustWrapperReadOrchardPosition . hexBytes . orchWit
+
+updateOrchardWitness :: OrchardWitness -> [HexString] -> OrchardWitness
+updateOrchardWitness wit cmus =
+  OrchardWitness $
+  withPureBorshVarBuffer $
+  rustWrapperUpdateOrchardWitness (toBytes $ orchWit wit) (map toBytes cmus)

src/ZcashHaskell/Sapling.hs

@@ -18,11 +18,11 @@
 module ZcashHaskell.Sapling where
 
 import C.Zcash
-  ( rustWrapperIsShielded
+  ( rustWrapperDecodeSaplingAddress
+  , rustWrapperIsShielded
   , rustWrapperReadSaplingCommitmentTree
   , rustWrapperReadSaplingPosition
   , rustWrapperReadSaplingWitness
-  , rustWrapperDecodeSaplingAddress
   , rustWrapperSaplingCheck
   , rustWrapperSaplingChgPaymentAddress
   , rustWrapperSaplingDecodeEsk
@@ -31,12 +31,13 @@ import C.Zcash
   , rustWrapperSaplingSpendingkey
   , rustWrapperSaplingVkDecode
   , rustWrapperTxParse
+  , rustWrapperUpdateSaplingWitness
   )
 import Data.Aeson
 import qualified Data.ByteString as BS
 import qualified Data.ByteString.Char8 as C
-import qualified Data.Text as T
 import Data.HexString (HexString(..), fromText, hexString, toBytes, toText)
+import qualified Data.Text as T
 import Data.Word
 import Foreign.Rust.Marshall.Variable
   ( withPureBorshVarBuffer
@@ -192,17 +193,22 @@ getSaplingNotePosition :: SaplingWitness -> Integer
 getSaplingNotePosition =
   fromIntegral . rustWrapperReadSaplingPosition . hexBytes . sapWit
 
+updateSaplingWitness :: SaplingWitness -> [HexString] -> SaplingWitness
+updateSaplingWitness wit cmus =
+  SaplingWitness $
+  withPureBorshVarBuffer $
+  rustWrapperUpdateSaplingWitness (toBytes $ sapWit wit) (map toBytes cmus)
+
 -- | Encode a SaplingReceiver into HRF text
 encodeSaplingAddress :: ZcashNet -> SaplingReceiver -> Maybe T.Text
 encodeSaplingAddress net sr = do
   case net of
-    MainNet ->
+    MainNet -> Just $ encodeBech32 (C.pack sapPaymentAddressHrp) (getBytes sr)
-      Just $ encodeBech32 (C.pack sapPaymentAddressHrp) (getBytes sr)
     TestNet ->
       Just $ encodeBech32 (C.pack sapTestPaymentAddressHrp) (getBytes sr)
 
 -- | Helper to get de Nework Id from FFI response
-getNetId:: [Word8] -> ZcashNet
+getNetId :: [Word8] -> ZcashNet
 getNetId [x] = do
   case x of
     1 -> MainNet
@@ -214,10 +220,10 @@ decodeSaplingAddress sapling_address = do
   if BS.length sa > 1
     then do
       let sa0 = BS.unpack sa
-      Just $ SaplingAddress  (getNetId (take 1 sa0)) 
+      Just $
-           $ SaplingReceiver (BS.pack (drop 1 sa0))
+        SaplingAddress (getNetId (take 1 sa0)) $
+        SaplingReceiver (BS.pack (drop 1 sa0))
     else Nothing
   where
     sa =
-      withPureBorshVarBuffer $
+      withPureBorshVarBuffer $ rustWrapperDecodeSaplingAddress sapling_address
-      rustWrapperDecodeSaplingAddress sapling_address

zcash-haskell.cabal

@@ -5,7 +5,7 @@ cabal-version: 3.0
 -- see: https://github.com/sol/hpack
 
 name:           zcash-haskell
-version:        0.5.5.3
+version:        0.5.5.4
 synopsis:       Utilities to interact with the Zcash blockchain
 description:    Please see the README on the repo at <https://git.vergara.tech/Vergara_Tech/zcash-haskell#readme>
 category:       Blockchain