DTLS: Fixed retransmission in response to re-receipt of an aggregated ChangeCipherSpec

- see https://github.com/bcgit/bc-java/pull/1491

1 files changed, 11 insertions, 2 deletions

diff --git a/crypto/src/tls/TlsUtilities.cs b/crypto/src/tls/TlsUtilities.cs
index 2887b0df1..67a49e5ef 100644
--- a/crypto/src/tls/TlsUtilities.cs
+++ b/crypto/src/tls/TlsUtilities.cs
@@ -770,11 +770,20 @@ namespace Org.BouncyCastle.Tls
 
         public static int ReadUint16(byte[] buf, int offset)
         {
-            int n = (buf[offset] & 0xff) << 8;
-            n |= (buf[++offset] & 0xff);
+            int n = buf[offset] << 8;
+            n |= buf[++offset];
             return n;
         }
 
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+        public static int ReadUint16(ReadOnlySpan<byte> buffer)
+        {
+            int n = buffer[0] << 8;
+            n |= buffer[1];
+            return n;
+        }
+#endif
+
         public static int ReadUint24(Stream input)
         {
             int i1 = input.ReadByte();