From a61642e7462cdc6ef66374297020421437fa5abb Mon Sep 17 00:00:00 2001
From: Peter Dettman <peter.dettman@bouncycastle.org>
Date: Thu, 2 Feb 2023 11:05:18 +0700
Subject: Support null 'otherInfo'

---
 crypto/src/crypto/agreement/kdf/ConcatenationKdfGenerator.cs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/crypto/src/crypto/agreement/kdf/ConcatenationKdfGenerator.cs b/crypto/src/crypto/agreement/kdf/ConcatenationKdfGenerator.cs
index 207c795da..8467460b4 100644
--- a/crypto/src/crypto/agreement/kdf/ConcatenationKdfGenerator.cs
+++ b/crypto/src/crypto/agreement/kdf/ConcatenationKdfGenerator.cs
@@ -29,9 +29,12 @@ namespace Org.BouncyCastle.Crypto.Agreement.Kdf
             byte[] sharedSecret = kdfParameters.GetSharedSecret();
             byte[] otherInfo = kdfParameters.GetIV();
 
-            m_buffer = new byte[4 + sharedSecret.Length + otherInfo.Length + m_hLen];
+            m_buffer = new byte[4 + sharedSecret.Length + (otherInfo == null ? 0 : otherInfo.Length) + m_hLen];
             sharedSecret.CopyTo(m_buffer, 4);
-            otherInfo.CopyTo(m_buffer, 4 + sharedSecret.Length);
+            if (otherInfo != null)
+            {
+                otherInfo.CopyTo(m_buffer, 4 + sharedSecret.Length);
+            }
         }
 
         /// <summary>the underlying digest.</summary>
-- 
cgit 1.4.1