From 73f71ddda7ebd2b57281c7c546138408c8a289ee Mon Sep 17 00:00:00 2001
From: Peter Dettman <peter.dettman@bouncycastle.org>
Date: Sun, 17 Sep 2017 11:23:40 +0700
Subject: Check final padding character in Base64 data.

---
 crypto/src/util/encoders/Base64Encoder.cs | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'crypto/src/util/encoders/Base64Encoder.cs')

diff --git a/crypto/src/util/encoders/Base64Encoder.cs b/crypto/src/util/encoders/Base64Encoder.cs
index 7b53df25a..07294c9a6 100644
--- a/crypto/src/util/encoders/Base64Encoder.cs
+++ b/crypto/src/util/encoders/Base64Encoder.cs
@@ -269,6 +269,9 @@ namespace Org.BouncyCastle.Utilities.Encoders
         {
             if (c3 == padding)
             {
+                if (c4 != padding)
+                    throw new IOException("invalid characters encountered at end of base64 data");
+
                 byte b1 = decodingTable[c1];
                 byte b2 = decodingTable[c2];
 
-- 
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