From 04443c312ab6c592449d77d7fb5753bd0cf3324d Mon Sep 17 00:00:00 2001
From: Peter Dettman <peter.dettman@bouncycastle.org>
Date: Sun, 5 Apr 2020 18:41:24 +0700
Subject: added argument check for bit block size

---
 crypto/src/crypto/modes/CfbBlockCipher.cs | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'crypto/src')

diff --git a/crypto/src/crypto/modes/CfbBlockCipher.cs b/crypto/src/crypto/modes/CfbBlockCipher.cs
index 433716535..ed0be407a 100644
--- a/crypto/src/crypto/modes/CfbBlockCipher.cs
+++ b/crypto/src/crypto/modes/CfbBlockCipher.cs
@@ -29,6 +29,9 @@ namespace Org.BouncyCastle.Crypto.Modes
             IBlockCipher cipher,
             int          bitBlockSize)
         {
+            if (bitBlockSize < 8 || (bitBlockSize & 7) != 0)
+                throw new ArgumentException("CFB" + bitBlockSize + " not supported", "bitBlockSize");
+
             this.cipher = cipher;
             this.blockSize = bitBlockSize / 8;
             this.IV = new byte[cipher.GetBlockSize()];
-- 
cgit 1.4.1