From 0b6a702f245b9bc44f5396d700f8fa150e9bd885 Mon Sep 17 00:00:00 2001
From: Gustav Simonsson <gustav.simonsson@gmail.com>
Date: Fri, 1 May 2015 08:12:42 +0200
Subject: [PATCH] Remove hashing of MAC key part of KDF derived key

---
 crypto/ecies/ecies.go | 6 ------
 1 file changed, 6 deletions(-)

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 {