From 2b1577950ce6e9cfd3bdd1007260d0dd90ca2003 Mon Sep 17 00:00:00 2001
From: weidai <weidai@57ff6487-cd31-0410-9ec3-f628ee90f5f0>
Date: Tue, 3 Aug 2010 20:28:10 +0000
Subject: fix memcpy with same src and dest (Peter Klotz)

git-svn-id: svn://svn.code.sf.net/p/cryptopp/code/trunk/c5@514 57ff6487-cd31-0410-9ec3-f628ee90f5f0
---
 iterhash.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'iterhash.cpp')

diff --git a/iterhash.cpp b/iterhash.cpp
index 478950c..1e31e9f 100644
--- a/iterhash.cpp
+++ b/iterhash.cpp
@@ -66,7 +66,8 @@ template <class T, class BASE> void IteratedHashBase<T, BASE>::Update(const byte
 			} while (len >= blockSize);
 	}
 
-	memcpy(data, input, len);
+	if (len && data != input)
+		memcpy(data, input, len);
 }
 
 template <class T, class BASE> byte * IteratedHashBase<T, BASE>::CreateUpdateSpace(size_t &size)
-- 
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