diff --git a/crypto/ecies/ecies.go b/crypto/ecies/ecies.go
index 5fff2fa91c..ebdc4e2635 100644
--- a/crypto/ecies/ecies.go
+++ b/crypto/ecies/ecies.go
@@ -243,9 +243,6 @@ func Encrypt(rand io.Reader, pub *PublicKey, m, s1, s2 []byte) (ct []byte, err e
 	}
 	Ke := K[:params.KeyLen]
 	Km := K[params.KeyLen:]
-	hash.Write(Km)
-	Km = hash.Sum(nil)
-	hash.Reset()
 
 	em, err := symEncrypt(rand, params, Ke, m)
 	if err != nil {
@@ -323,9 +320,6 @@ func (prv *PrivateKey) Decrypt(rand io.Reader, c, s1, s2 []byte) (m []byte, err
 
 	Ke := K[:params.KeyLen]
 	Km := K[params.KeyLen:]
-	hash.Write(Km)
-	Km = hash.Sum(nil)
-	hash.Reset()
 
 	d := messageTag(params.Hash, Km, c[mStart:mEnd], s2)
 	if subtle.ConstantTimeCompare(c[mEnd:], d) != 1 {