fix(hash): updated sha1 with sha256 for file hash (#515)

* fix(hash): updated sha1 with sha256 for file hash

Author: cnlangzi

.github/workflows/benchmark.yml

@@ -1,4 +1,4 @@
-name: Benchmark tests
+name: Benchmark
 
 concurrency:
   group: "benchmark-${{ github.ref }}"

code/go/0chain.net/blobbercore/filestore/fs_store.go

@@ -3,7 +3,7 @@ package filestore
 import (
 	"bytes"
 	"context"
-	"crypto/sha1"
+	"crypto/sha256"
 	"encoding/hex"
 	"encoding/json"
 	"fmt"
@@ -475,7 +475,7 @@ func (fs *FileFSStore) WriteFile(allocationID string, fileData *FileInputData,
 
 	fileRef := &FileOutputData{}
 
-	h := sha1.New()
+	h := sha256.New()
 	bytesBuffer := bytes.NewBuffer(nil)
 	multiHashWriter := io.MultiWriter(h, bytesBuffer)
 	tReader := io.TeeReader(infile, multiHashWriter)
@@ -548,7 +548,7 @@ func (fs *FileFSStore) WriteChunk(allocationID string, fileData *FileInputData,
 		fileRef.ChunkUploaded = true
 	}
 
-	h := sha1.New()
+	h := sha256.New()
 	size, err := dest.WriteChunk(context.TODO(), fileData.UploadOffset, io.TeeReader(infile, h))
 
 	if err != nil {
@@ -576,7 +576,7 @@ func (fs *FileFSStore) IterateObjects(allocationID string, handler FileObjectHan
 				return nil
 			}
 			defer f.Close()
-			h := sha1.New()
+			h := sha256.New()
 			if _, err := io.Copy(h, f); err != nil {
 				return nil
 			}

code/go/0chain.net/blobbercore/filestore/mock_store.go

@@ -1,7 +1,7 @@
 package filestore
 
 import (
-	"crypto/sha1"
+	"crypto/sha256"
 	"encoding/hex"
 	"encoding/json"
 	"io"
@@ -31,7 +31,7 @@ func (ms *MockStore) WriteFile(allocationID string, fileData *FileInputData, inf
 
 	fileRef.ChunkUploaded = true
 
-	h := sha1.New()
+	h := sha256.New()
 	reader := io.TeeReader(infile, h)
 	fileSize := int64(0)
 	for {