From fcbb6956ca47b38549143f289d017485217c7a36 Mon Sep 17 00:00:00 2001
From: Peter Dettman <peter.dettman@bouncycastle.org>
Date: Sat, 25 Jan 2014 20:44:18 +0700
Subject: Add 0 guard in ModInverse

---
 crypto/src/math/ec/LongArray.cs | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'crypto/src')

diff --git a/crypto/src/math/ec/LongArray.cs b/crypto/src/math/ec/LongArray.cs
index d694f0cf0..a863c0a61 100644
--- a/crypto/src/math/ec/LongArray.cs
+++ b/crypto/src/math/ec/LongArray.cs
@@ -1879,6 +1879,10 @@ namespace Org.BouncyCastle.Math.EC
              * Output: a(z)^(-1) mod f(z)
              */
             int uzDegree = Degree();
+            if (uzDegree == 0)
+            {
+                throw new InvalidOperationException();
+            }
             if (uzDegree == 1)
             {
                 return this;
-- 
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