5 files changed, 15 insertions, 14 deletions
diff --git a/plumbing/format/commitgraph/encoder.go b/plumbing/format/commitgraph/encoder.go
index d34076f..bcf7d03 100644
--- a/plumbing/format/commitgraph/encoder.go
+++ b/plumbing/format/commitgraph/encoder.go
@@ -1,11 +1,11 @@
 package commitgraph
 
 import (
-	"crypto/sha1"
-	"hash"
+	"crypto"
 	"io"
 
 	"github.com/go-git/go-git/v5/plumbing"
+	"github.com/go-git/go-git/v5/plumbing/hash"
 	"github.com/go-git/go-git/v5/utils/binary"
 )
 
@@ -17,7 +17,7 @@ type Encoder struct {
 
 // NewEncoder returns a new stream encoder that writes to w.
 func NewEncoder(w io.Writer) *Encoder {
-	h := sha1.New()
+	h := hash.New(crypto.SHA1)
 	mw := io.MultiWriter(w, h)
 	return &Encoder{mw, h}
 }
diff --git a/plumbing/format/idxfile/encoder.go b/plumbing/format/idxfile/encoder.go
index 26b2e4d..6ac445f 100644
--- a/plumbing/format/idxfile/encoder.go
+++ b/plumbing/format/idxfile/encoder.go
@@ -1,10 +1,10 @@
 package idxfile
 
 import (
-	"crypto/sha1"
-	"hash"
+	"crypto"
 	"io"
 
+	"github.com/go-git/go-git/v5/plumbing/hash"
 	"github.com/go-git/go-git/v5/utils/binary"
 )
 
@@ -16,7 +16,7 @@ type Encoder struct {
 
 // NewEncoder returns a new stream encoder that writes to w.
 func NewEncoder(w io.Writer) *Encoder {
-	h := sha1.New()
+	h := hash.New(crypto.SHA1)
 	mw := io.MultiWriter(w, h)
 	return &Encoder{mw, h}
 }
diff --git a/plumbing/format/index/decoder.go b/plumbing/format/index/decoder.go
index 036b636..c4da20c 100644
--- a/plumbing/format/index/decoder.go
+++ b/plumbing/format/index/decoder.go
@@ -3,15 +3,15 @@ package index
 import (
 	"bufio"
 	"bytes"
-	"crypto/sha1"
+	"crypto"
 	"errors"
-	"hash"
 	"io"
 	"io/ioutil"
 	"strconv"
 	"time"
 
 	"github.com/go-git/go-git/v5/plumbing"
+	"github.com/go-git/go-git/v5/plumbing/hash"
 	"github.com/go-git/go-git/v5/utils/binary"
 )
 
@@ -49,7 +49,7 @@ type Decoder struct {
 
 // NewDecoder returns a new decoder that reads from r.
 func NewDecoder(r io.Reader) *Decoder {
-	h := sha1.New()
+	h := hash.New(crypto.SHA1)
 	return &Decoder{
 		r:         io.TeeReader(r, h),
 		hash:      h,
diff --git a/plumbing/format/index/encoder.go b/plumbing/format/index/encoder.go
index 2c94d93..a915378 100644
--- a/plumbing/format/index/encoder.go
+++ b/plumbing/format/index/encoder.go
@@ -2,13 +2,13 @@ package index
 
 import (
 	"bytes"
-	"crypto/sha1"
+	"crypto"
 	"errors"
-	"hash"
 	"io"
 	"sort"
 	"time"
 
+	"github.com/go-git/go-git/v5/plumbing/hash"
 	"github.com/go-git/go-git/v5/utils/binary"
 )
 
@@ -29,7 +29,7 @@ type Encoder struct {
 
 // NewEncoder returns a new encoder that writes to w.
 func NewEncoder(w io.Writer) *Encoder {
-	h := sha1.New()
+	h := hash.New(crypto.SHA1)
 	mw := io.MultiWriter(w, h)
 	return &Encoder{mw, h}
 }
diff --git a/plumbing/format/packfile/encoder.go b/plumbing/format/packfile/encoder.go
index 5501f88..a8a7e96 100644
--- a/plumbing/format/packfile/encoder.go
+++ b/plumbing/format/packfile/encoder.go
@@ -2,11 +2,12 @@ package packfile
 
 import (
 	"compress/zlib"
-	"crypto/sha1"
+	"crypto"
 	"fmt"
 	"io"
 
 	"github.com/go-git/go-git/v5/plumbing"
+	"github.com/go-git/go-git/v5/plumbing/hash"
 	"github.com/go-git/go-git/v5/plumbing/storer"
 	"github.com/go-git/go-git/v5/utils/binary"
 	"github.com/go-git/go-git/v5/utils/ioutil"
@@ -28,7 +29,7 @@ type Encoder struct {
 // OFSDeltaObject. To use Reference deltas, set useRefDeltas to true.
 func NewEncoder(w io.Writer, s storer.EncodedObjectStorer, useRefDeltas bool) *Encoder {
 	h := plumbing.Hasher{
-		Hash: sha1.New(),
+		Hash: hash.New(crypto.SHA1),
 	}
 	mw := io.MultiWriter(w, h)
 	ow := newOffsetWriter(mw)