add wallet ffi auth-transfer private method

integration_tests/tests/wallet_ffi.rs

@@ -117,6 +117,14 @@ unsafe extern "C" {
         out_result: *mut FfiTransferResult,
     ) -> error::WalletFfiError;
 
+    fn wallet_ffi_transfer_private(
+        handle: *mut WalletHandle,
+        from: *const FfiBytes32,
+        to_keys: *const FfiPrivateAccountKeys,
+        amount: *const [u8; 16],
+        out_result: *mut FfiTransferResult,
+    ) -> error::WalletFfiError;
+
     fn wallet_ffi_free_transfer_result(result: *mut FfiTransferResult);
 
     fn wallet_ffi_register_public_account(
@@ -839,7 +847,7 @@ fn test_wallet_ffi_transfer_shielded() -> Result<()> {
     let ctx = BlockingTestContext::new().unwrap();
     let home = tempfile::tempdir().unwrap();
     let wallet_ffi_handle = new_wallet_ffi_with_test_context_config(&ctx, home.path());
-    let from: FfiBytes32 = (&ACC_SENDER.parse::<AccountId>().unwrap()).into();
+    let from: FfiBytes32 = (&ctx.ctx().existing_public_accounts()[0]).into();
     let (to, to_keys) = unsafe {
         let mut out_account_id = FfiBytes32::default();
         let mut out_keys = FfiPrivateAccountKeys::default();
@@ -915,7 +923,7 @@ fn test_wallet_ffi_transfer_deshielded() -> Result<()> {
     let ctx = BlockingTestContext::new().unwrap();
     let home = tempfile::tempdir().unwrap();
     let wallet_ffi_handle = new_wallet_ffi_with_test_context_config(&ctx, home.path());
-    let from: FfiBytes32 = (&ACC_SENDER_PRIVATE.parse::<AccountId>().unwrap()).into();
+    let from: FfiBytes32 = (&ctx.ctx().existing_private_accounts()[0]).into();
     let to = FfiBytes32::from_bytes([37; 32]);
     let amount: [u8; 16] = 100u128.to_le_bytes();
 
@@ -972,3 +980,81 @@ fn test_wallet_ffi_transfer_deshielded() -> Result<()> {
 
     Ok(())
 }
+
+#[test]
+fn test_wallet_ffi_transfer_private() -> Result<()> {
+    let ctx = BlockingTestContext::new().unwrap();
+    let home = tempfile::tempdir().unwrap();
+    let wallet_ffi_handle = new_wallet_ffi_with_test_context_config(&ctx, home.path());
+
+    let from: FfiBytes32 = (&ctx.ctx().existing_private_accounts()[0]).into();
+    let (to, to_keys) = unsafe {
+        let mut out_account_id = FfiBytes32::default();
+        let mut out_keys = FfiPrivateAccountKeys::default();
+        wallet_ffi_create_account_private(
+            wallet_ffi_handle,
+            (&mut out_account_id) as *mut FfiBytes32,
+        );
+        wallet_ffi_get_private_account_keys(
+            wallet_ffi_handle,
+            (&out_account_id) as *const FfiBytes32,
+            (&mut out_keys) as *mut FfiPrivateAccountKeys,
+        );
+        (out_account_id, out_keys)
+    };
+
+    let amount: [u8; 16] = 100u128.to_le_bytes();
+
+    let mut transfer_result = FfiTransferResult::default();
+    unsafe {
+        wallet_ffi_transfer_private(
+            wallet_ffi_handle,
+            (&from) as *const FfiBytes32,
+            (&to_keys) as *const FfiPrivateAccountKeys,
+            (&amount) as *const [u8; 16],
+            (&mut transfer_result) as *mut FfiTransferResult,
+        );
+    }
+
+    info!("Waiting for next block creation");
+    std::thread::sleep(Duration::from_secs(TIME_TO_WAIT_FOR_BLOCK_SECONDS));
+
+    // Sync private account local storage with onchain encrypted state
+    unsafe {
+        let mut current_height = 0;
+        wallet_ffi_get_current_block_height(wallet_ffi_handle, (&mut current_height) as *mut u64);
+        wallet_ffi_sync_to_block(wallet_ffi_handle, current_height);
+    };
+
+    let from_balance = unsafe {
+        let mut out_balance: [u8; 16] = [0; 16];
+        let _result = wallet_ffi_get_balance(
+            wallet_ffi_handle,
+            (&from) as *const FfiBytes32,
+            false,
+            (&mut out_balance) as *mut [u8; 16],
+        );
+        u128::from_le_bytes(out_balance)
+    };
+
+    let to_balance = unsafe {
+        let mut out_balance: [u8; 16] = [0; 16];
+        let _result = wallet_ffi_get_balance(
+            wallet_ffi_handle,
+            (&to) as *const FfiBytes32,
+            false,
+            (&mut out_balance) as *mut [u8; 16],
+        );
+        u128::from_le_bytes(out_balance)
+    };
+
+    assert_eq!(from_balance, 9900);
+    assert_eq!(to_balance, 100);
+
+    unsafe {
+        wallet_ffi_free_transfer_result((&mut transfer_result) as *mut FfiTransferResult);
+        wallet_ffi_destroy(wallet_ffi_handle);
+    }
+
+    Ok(())
+}

wallet-ffi/src/transfer.rs

@@ -104,7 +104,7 @@ pub unsafe extern "C" fn wallet_ffi_transfer_public(
 
 /// Send a shielded token transfer.
 ///
-/// Transfers tokens from one private account to another on the network.
+/// Transfers tokens from a public account to a private account.
 ///
 /// # Parameters
 /// - `handle`: Valid wallet handle
@@ -201,7 +201,7 @@ pub unsafe extern "C" fn wallet_ffi_transfer_shielded(
 
 /// Send a deshielded token transfer.
 ///
-/// Transfers tokens from one private account to another on the network.
+/// Transfers tokens from a private account to a public account.
 ///
 /// # Parameters
 /// - `handle`: Valid wallet handle
@@ -287,6 +287,102 @@ pub unsafe extern "C" fn wallet_ffi_transfer_deshielded(
     }
 }
 
+/// Send a private token transfer.
+///
+/// Transfers tokens from a private account to another private account.
+///
+/// # Parameters
+/// - `handle`: Valid wallet handle
+/// - `from`: Source account ID (must be owned by this wallet)
+/// - `to_keys`: Destination account keys
+/// - `amount`: Amount to transfer as little-endian [u8; 16]
+/// - `out_result`: Output pointer for transfer result
+///
+/// # Returns
+/// - `Success` if the transfer was submitted successfully
+/// - `InsufficientFunds` if the source account doesn't have enough balance
+/// - `KeyNotFound` if the source account's signing key is not in this wallet
+/// - Error code on other failures
+///
+/// # Memory
+/// The result must be freed with `wallet_ffi_free_transfer_result()`.
+///
+/// # Safety
+/// - `handle` must be a valid wallet handle from `wallet_ffi_create_new` or `wallet_ffi_open`
+/// - `from` must be a valid pointer to a `FfiBytes32` struct
+/// - `to_keys` must be a valid pointer to a `FfiPrivateAccountKeys` struct
+/// - `amount` must be a valid pointer to a `[u8; 16]` array
+/// - `out_result` must be a valid pointer to a `FfiTransferResult` struct
+#[no_mangle]
+pub unsafe extern "C" fn wallet_ffi_transfer_private(
+    handle: *mut WalletHandle,
+    from: *const FfiBytes32,
+    to_keys: *const FfiPrivateAccountKeys,
+    amount: *const [u8; 16],
+    out_result: *mut FfiTransferResult,
+) -> WalletFfiError {
+    let wrapper = match get_wallet(handle) {
+        Ok(w) => w,
+        Err(e) => return e,
+    };
+
+    if from.is_null() || to_keys.is_null() || amount.is_null() || out_result.is_null() {
+        print_error("Null pointer argument");
+        return WalletFfiError::NullPointer;
+    }
+
+    let wallet = match wrapper.core.lock() {
+        Ok(w) => w,
+        Err(e) => {
+            print_error(format!("Failed to lock wallet: {}", e));
+            return WalletFfiError::InternalError;
+        }
+    };
+
+    let from_id = AccountId::new(unsafe { (*from).data });
+    let to_npk = (*to_keys).npk();
+    let to_ipk = match (*to_keys).ivk() {
+        Ok(ipk) => ipk,
+        Err(e) => {
+            print_error("Invalid viewing key");
+            return e;
+        }
+    };
+    let amount = u128::from_le_bytes(unsafe { *amount });
+
+    let transfer = NativeTokenTransfer(&wallet);
+
+    match block_on(transfer.send_private_transfer_to_outer_account(from_id, to_npk, to_ipk, amount))
+    {
+        Ok(Ok((response, _shared_key))) => {
+            let tx_hash = CString::new(response.tx_hash)
+                .map(|s| s.into_raw())
+                .unwrap_or(ptr::null_mut());
+
+            unsafe {
+                (*out_result).tx_hash = tx_hash;
+                (*out_result).success = true;
+            }
+            WalletFfiError::Success
+        }
+        Ok(Err(e)) => {
+            print_error(format!("Transfer failed: {:?}", e));
+            unsafe {
+                (*out_result).tx_hash = ptr::null_mut();
+                (*out_result).success = false;
+            }
+            match e {
+                ExecutionFailureKind::InsufficientFundsError => WalletFfiError::InsufficientFunds,
+                ExecutionFailureKind::KeyNotFoundError => WalletFfiError::KeyNotFound,
+                ExecutionFailureKind::SequencerError => WalletFfiError::NetworkError,
+                ExecutionFailureKind::SequencerClientError(_) => WalletFfiError::NetworkError,
+                _ => WalletFfiError::InternalError,
+            }
+        }
+        Err(e) => e,
+    }
+}
+
 /// Register a public account on the network.
 ///
 /// This initializes a public account on the blockchain. The account must be