From 8c95db1b5a45df7823ea80a22d6eb7c692e90a6f Mon Sep 17 00:00:00 2001
From: lloyd <lloyd@randombit.net>
Date: Tue, 14 Jul 2009 13:10:13 +0000
Subject: Avoid a crash in Skein_512::add_data if it is called with a
 zero-length input vector.

---
 src/hash/skein/skein_512.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/hash/skein/skein_512.cpp b/src/hash/skein/skein_512.cpp
index eaef641ed..51eef262c 100644
--- a/src/hash/skein/skein_512.cpp
+++ b/src/hash/skein/skein_512.cpp
@@ -193,6 +193,9 @@ void Skein_512::clear() throw()
 
 void Skein_512::add_data(const byte input[], u32bit length)
    {
+   if(length == 0)
+      return;
+
    if(buf_pos)
       {
       buffer.copy(buf_pos, input, length);
-- 
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