From 68c795fe81277f73aeb90d8ad4c6f4305f32c906 Mon Sep 17 00:00:00 2001
From: Peter Dettman <peter.dettman@bouncycastle.org>
Date: Mon, 12 Jul 2021 15:15:36 +0700
Subject: Port of new TLS API from bc-java

---
 crypto/src/tls/ServerNameList.cs | 87 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 crypto/src/tls/ServerNameList.cs

(limited to 'crypto/src/tls/ServerNameList.cs')

diff --git a/crypto/src/tls/ServerNameList.cs b/crypto/src/tls/ServerNameList.cs
new file mode 100644
index 000000000..915e94390
--- /dev/null
+++ b/crypto/src/tls/ServerNameList.cs
@@ -0,0 +1,87 @@
+using System;
+using System.Collections;
+using System.IO;
+
+using Org.BouncyCastle.Utilities;
+using Org.BouncyCastle.Utilities.IO;
+
+namespace Org.BouncyCastle.Tls
+{
+    public sealed class ServerNameList
+    {
+        private readonly IList m_serverNameList;
+
+        /// <param name="serverNameList">an <see cref="IList"/> of <see cref="ServerName"/>.</param>
+        public ServerNameList(IList serverNameList)
+        {
+            if (null == serverNameList)
+                throw new ArgumentNullException("serverNameList");
+
+            this.m_serverNameList = serverNameList;
+        }
+
+        /// <returns>an <see cref="IList"/> of <see cref="ServerName"/>.</returns>
+        public IList ServerNames
+        {
+            get { return m_serverNameList; }
+        }
+
+        /// <summary>Encode this <see cref="ServerNameList"/> to a <see cref="Stream"/>.</summary>
+        /// <param name="output">the <see cref="Stream"/> to encode to .</param>
+        /// <exception cref="IOException"/>
+        public void Encode(Stream output)
+        {
+            MemoryStream buf = new MemoryStream();
+
+            short[] nameTypesSeen = TlsUtilities.EmptyShorts;
+            foreach (ServerName entry in ServerNames)
+            {
+                nameTypesSeen = CheckNameType(nameTypesSeen, entry.NameType);
+                if (null == nameTypesSeen)
+                    throw new TlsFatalAlert(AlertDescription.internal_error);
+
+                entry.Encode(buf);
+            }
+
+            int length = (int)buf.Length;
+            TlsUtilities.CheckUint16(length);
+            TlsUtilities.WriteUint16(length, output);
+            Streams.WriteBufTo(buf, output);
+        }
+
+        /// <summary>Parse a <see cref="ServerNameList"/> from a <see cref="Stream"/>.</summary>
+        /// <param name="input">the <see cref="Stream"/> to parse from.</param>
+        /// <returns>a <see cref="ServerNameList"/> object.</returns>
+        /// <exception cref="IOException"/>
+        public static ServerNameList Parse(Stream input)
+        {
+            byte[] data = TlsUtilities.ReadOpaque16(input, 1);
+
+            MemoryStream buf = new MemoryStream(data, false);
+
+            short[] nameTypesSeen = TlsUtilities.EmptyShorts;
+            IList server_name_list = Platform.CreateArrayList();
+            while (buf.Position < buf.Length)
+            {
+                ServerName entry = ServerName.Parse(buf);
+
+                nameTypesSeen = CheckNameType(nameTypesSeen, entry.NameType);
+                if (null == nameTypesSeen)
+                    throw new TlsFatalAlert(AlertDescription.illegal_parameter);
+
+                server_name_list.Add(entry);
+            }
+
+            return new ServerNameList(server_name_list);
+        }
+
+        private static short[] CheckNameType(short[] nameTypesSeen, short nameType)
+        {
+             // RFC 6066 3. The ServerNameList MUST NOT contain more than one name of the same NameType.
+            if (Arrays.Contains(nameTypesSeen, nameType))
+                return null;
+
+            return Arrays.Append(nameTypesSeen, nameType);
+        }
+    }
+}
-- 
cgit 1.4.1