From 260cee498e099a1abe7cedf7c4030eff00c37cb8 Mon Sep 17 00:00:00 2001
From: Simon Tatham <anakin@pobox.com>
Date: Sun, 20 Feb 2011 15:06:39 +0000
Subject: [PATCH] Fix bug in Karatsuba multiplication, which affected
 propagation of a carry by more than one word. Now the current set of test
 cases all pass again.

[originally from svn r9098]
---
 sshbn.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sshbn.c b/sshbn.c
index 20244e86..cae1bd9e 100644
--- a/sshbn.c
+++ b/sshbn.c
@@ -386,6 +386,7 @@ static void internal_mul(const BignumInt *a, const BignumInt *b,
             carry += c[j];
             c[j] = (BignumInt)carry;
             carry >>= BIGNUM_INT_BITS;
+            j--;
         }
 #ifdef KARA_DEBUG
         printf("ab = 0x");