SMB2: Added EncryptionCapabilities structure implementation

SMBLibrary/SMB2/Structures/EncryptionCapabilities.cs

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+/* Copyright (C) 2024 Tal Aloni <tal.aloni.il@gmail.com>. All rights reserved.
+ * 
+ * You can redistribute this program and/or modify it under the terms of
+ * the GNU Lesser Public License as published by the Free Software Foundation,
+ * either version 3 of the License, or (at your option) any later version.
+ */
+using System.Collections.Generic;
+using Utilities;
+
+namespace SMBLibrary.SMB2
+{
+    /// <summary>
+    /// [MS-SMB2] 2.2.3.1.2 SMB2_ENCRYPTION_CAPABILITIES
+    /// </summary>
+    public class EncryptionCapabilities
+    {
+        // ushort CipherCount;
+        public List<CipherAlgorithm> Ciphers = new List<CipherAlgorithm>();
+
+        public EncryptionCapabilities()
+        {
+        }
+
+        public EncryptionCapabilities(byte[] buffer, int offset)
+        {
+            ushort cipherCount = LittleEndianConverter.ToUInt16(buffer, offset);
+            for (int index = 0; index < cipherCount; index++)
+            {
+                Ciphers.Add((CipherAlgorithm)LittleEndianConverter.ToUInt16(buffer, offset + index * 2));
+            }
+        }
+
+        public byte[] GetBytes()
+        {
+            int length = 2 * Ciphers.Count * 2;
+            byte[] buffer = new byte[length];
+            LittleEndianWriter.WriteUInt16(buffer, 0, (ushort)Ciphers.Count);
+            for (int index = 0; index < Ciphers.Count; index++)
+            {
+                LittleEndianWriter.WriteUInt16(buffer, 2 + index * 2, (ushort)Ciphers[index]);
+            }
+
+            return buffer;
+        }
+    }
+}

SMBLibrary/SMB2/Structures/Enums/CipherAlgorithm.cs

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+namespace SMBLibrary.SMB2
+{
+    public enum CipherAlgorithm : ushort
+    {
+        Aes128Ccm = 0x0001,
+        Aes128Gcm = 0x0002,
+        Aes256Ccm = 0x0003,
+        Aes256Gcm = 0x0004,
+    }
+}