From 3a7f6701d8e44585798faa6daeef2bcc7c3bcf6e Mon Sep 17 00:00:00 2001
From: Leonard Lyubich <leonard@nspcc.ru>
Date: Mon, 11 Jan 2021 16:50:49 +0300
Subject: [PATCH] [#290] object/rangehash: Apply salt to data before hashing

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
---
 pkg/services/object/get/get.go  | 3 ++-
 pkg/services/object/get/util.go | 4 ++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/pkg/services/object/get/get.go b/pkg/services/object/get/get.go
index 1e0ae0110..43e7d50b6 100644
--- a/pkg/services/object/get/get.go
+++ b/pkg/services/object/get/get.go
@@ -4,6 +4,7 @@ import (
 	"context"
 
 	objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
+	"github.com/nspcc-dev/neofs-node/pkg/util"
 	"go.uber.org/zap"
 )
 
@@ -33,7 +34,7 @@ func (s *Service) GetRangeHash(ctx context.Context, prm RangeHashPrm) (*RangeHas
 
 		rngPrm.SetRange(rng)
 		rngPrm.SetChunkWriter(&hasherWrapper{
-			hash: h,
+			hash: util.NewSaltingWriter(h, prm.salt),
 		})
 
 		if err := s.GetRange(ctx, rngPrm); err != nil {
diff --git a/pkg/services/object/get/util.go b/pkg/services/object/get/util.go
index 82a20ec1b..4c6a63593 100644
--- a/pkg/services/object/get/util.go
+++ b/pkg/services/object/get/util.go
@@ -2,7 +2,7 @@ package getsvc
 
 import (
 	"crypto/ecdsa"
-	"hash"
+	"io"
 
 	"github.com/nspcc-dev/neofs-api-go/pkg/client"
 	objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
@@ -40,7 +40,7 @@ type partWriter struct {
 }
 
 type hasherWrapper struct {
-	hash hash.Hash
+	hash io.Writer
 }
 
 func NewSimpleObjectWriter() *SimpleObjectWriter {