From 289e9c809f62b7c77b947c501e6278359753444c Mon Sep 17 00:00:00 2001
From: orignal <i2porignal@yandex.ru>
Date: Thu, 16 Mar 2017 16:30:32 -0400
Subject: [PATCH] correct padding for GOST 34.11

---
 Gost.cpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/Gost.cpp b/Gost.cpp
index d3c56eb2..41f52b7c 100644
--- a/Gost.cpp
+++ b/Gost.cpp
@@ -407,9 +407,15 @@ namespace crypto
 			s = m + s;
 			len -= 64;
 		}
-		memset (m.buf, 0, 64);
-		memcpy (m.buf + 64, buf, l);	
 		// stage 3
+		size_t padding = 64 - l;
+		if (padding)
+		{
+			memset (m.buf, 0, padding - 1);
+			m.buf[padding - 1] = 1;
+		}
+		memcpy (m.buf + padding, buf, l);
+
 		h = gN (N, h, m);
 		N.Add (l*8);	
 		s = m + s;