1 files changed, 9 insertions, 8 deletions
diff --git a/plumbing/hash.go b/plumbing/hash.go
index afc602a..39bb73f 100644
--- a/plumbing/hash.go
+++ b/plumbing/hash.go
@@ -2,15 +2,15 @@ package plumbing
 
 import (
 	"bytes"
-	"crypto/sha1"
 	"encoding/hex"
-	"hash"
 	"sort"
 	"strconv"
+
+	"github.com/go-git/go-git/v5/plumbing/hash"
 )
 
 // Hash SHA1 hashed content
-type Hash [20]byte
+type Hash [hash.Size]byte
 
 // ZeroHash is Hash with value zero
 var ZeroHash Hash
@@ -46,7 +46,7 @@ type Hasher struct {
 }
 
 func NewHasher(t ObjectType, size int64) Hasher {
-	h := Hasher{sha1.New()}
+	h := Hasher{hash.New(hash.CryptoType)}
 	h.Write(t.Bytes())
 	h.Write([]byte(" "))
 	h.Write([]byte(strconv.FormatInt(size, 10)))
@@ -74,10 +74,11 @@ func (p HashSlice) Swap(i, j int)      { p[i], p[j] = p[j], p[i] }
 
 // IsHash returns true if the given string is a valid hash.
 func IsHash(s string) bool {
-	if len(s) != 40 {
+	switch len(s) {
+	case hash.HexSize:
+		_, err := hex.DecodeString(s)
+		return err == nil
+	default:
 		return false
 	}
-
-	_, err := hex.DecodeString(s)
-	return err == nil
 }