From 1142ec19d44e2f135a072bfe613716d8e4668d64 Mon Sep 17 00:00:00 2001
From: Gregor Pintar <grpintar@gmail.com>
Date: Mon, 14 Oct 2013 14:12:24 +0200
Subject: [PATCH] skein256 hash simplification

---
 lib/hash/skein256.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/lib/hash/skein256.c b/lib/hash/skein256.c
index 68cf8ca..f82171f 100644
--- a/lib/hash/skein256.c
+++ b/lib/hash/skein256.c
@@ -149,11 +149,7 @@ static void skein256_finish(kripto_hash *s)
 	}
 
 	memset(s->buf + s->i, 0, 32 - s->i);
-
-	if(s->tweak[15] == 0x70) /* if still first */
-		s->tweak[15] = 0xF0; /* type MSG, first, final */
-	else s->tweak[15] = 0xB0; /* type MSG, final */
-
+	s->tweak[15] ^= 0x80; /* add final */
 	skein256_process(s);
 
 	memset(s->buf, 0, 32);
-- 
2.11.4.GIT