cipher: add plain/none ciphers

CHANGES

@@ -1,3 +1,6 @@
+4.4.1.0 2022-02-08
+- Add plain/none ciphers
+
 4.4.0.0 2021-01-01
 - Security: remove infrastructure of stream ciphers (#3048)
 - Show warning message when importing from deprecated legacy ss:// links.

appveyor.yml

@@ -11,7 +11,7 @@
 
 # version format
 # Build version format is taken from UI if it is not set
-version: 4.4.0.{build}
+version: 4.4.1.{build}
 
 # # branches to build
 # branches:

shadowsocks-csharp/Controller/Service/UpdateChecker.cs

@@ -33,7 +33,7 @@ namespace Shadowsocks.Controller
 
         public event EventHandler CheckUpdateCompleted;
 
-        public const string Version = "4.4.0.0";
+        public const string Version = "4.4.1.0";
         private readonly Version _version;
 
         public UpdateChecker()

shadowsocks-csharp/Encryption/EncryptorFactory.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.Reflection;
 using System.Text;
 using Shadowsocks.Encryption.AEAD;
+using Shadowsocks.Encryption.Stream;
 
 namespace Shadowsocks.Encryption
 {
@@ -16,6 +17,8 @@ namespace Shadowsocks.Encryption
         {
             var AEADMbedTLSEncryptorSupportedCiphers = AEADMbedTLSEncryptor.SupportedCiphers();
             var AEADSodiumEncryptorSupportedCiphers = AEADSodiumEncryptor.SupportedCiphers();
+            var PlainEncryptorSupportedCiphers = PlainEncryptor.SupportedCiphers();
+
             if (Sodium.AES256GCMAvailable)
             {
                 // prefer to aes-256-gcm in libsodium
@@ -43,6 +46,12 @@ namespace Shadowsocks.Encryption
                 if (!_registeredEncryptors.ContainsKey(method))
                     _registeredEncryptors.Add(method, typeof(AEADMbedTLSEncryptor));
             }
+
+            foreach (string method in PlainEncryptorSupportedCiphers)
+            {
+                if (!_registeredEncryptors.ContainsKey(method))
+                    _registeredEncryptors.Add(method, typeof(PlainEncryptor));
+            }
         }
 
         public static IEncryptor GetEncryptor(string method, string password)

shadowsocks-csharp/Encryption/Stream/PlainEncryptor.cs

@@ -0,0 +1,98 @@
+using System;
+using System.Collections.Generic;
+
+namespace Shadowsocks.Encryption.Stream
+{
+    class PlainEncryptor
+        : EncryptorBase, IDisposable
+    {
+        const int CIPHER_NONE = 1;
+
+        private static Dictionary<string, EncryptorInfo> _ciphers = new Dictionary<string, EncryptorInfo> {
+            { "plain", new EncryptorInfo("PLAIN", 0, 0, CIPHER_NONE) },
+            { "none", new EncryptorInfo("PLAIN", 0, 0, CIPHER_NONE) }
+        };
+
+        public PlainEncryptor(string method, string password) : base(method, password)
+        {
+        }
+
+        public static List<string> SupportedCiphers()
+        {
+            return new List<string>(_ciphers.Keys);
+        }
+
+        protected Dictionary<string, EncryptorInfo> getCiphers()
+        {
+            return _ciphers;
+        }
+
+        #region TCP
+
+        public override void Encrypt(byte[] buf, int length, byte[] outbuf, out int outlength)
+        {
+            Buffer.BlockCopy(buf, 0, outbuf, 0, length);
+            outlength = length;
+        }
+
+        public override void Decrypt(byte[] buf, int length, byte[] outbuf, out int outlength)
+        {
+            Buffer.BlockCopy(buf, 0, outbuf, 0, length);
+            outlength = length;
+        }
+
+        #endregion
+
+        #region UDP
+
+        public override void EncryptUDP(byte[] buf, int length, byte[] outbuf, out int outlength)
+        {
+            Buffer.BlockCopy(buf, 0, outbuf, 0, length);
+            outlength = length;
+        }
+
+        public override void DecryptUDP(byte[] buf, int length, byte[] outbuf, out int outlength)
+        {
+            Buffer.BlockCopy(buf, 0, outbuf, 0, length);
+            outlength = length;
+        }
+
+        #endregion
+
+
+        #region IDisposable
+
+        private bool _disposed;
+
+        // instance based lock
+        private readonly object _lock = new object();
+
+        public override void Dispose()
+        {
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
+
+        ~PlainEncryptor()
+        {
+            Dispose(false);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            lock (_lock)
+            {
+                if (_disposed) return;
+                _disposed = true;
+            }
+
+            if (disposing)
+            {
+                // free managed objects
+            }
+        }
+
+        #endregion
+
+    }
+}

shadowsocks-csharp/View/ConfigForm.cs

@@ -27,6 +27,8 @@ namespace Shadowsocks.View
             // Edit here to add/delete encryption method displayed in UI
             private static string[] inuseMethod = new string[]
             {
+                "none",
+                "plain",
                 "aes-256-gcm",
                 "aes-192-gcm",
                 "aes-128-gcm",
@@ -611,5 +613,10 @@ namespace Shadowsocks.View
         {
             ShowHidePluginArgInput(NeedPluginArgCheckBox.Checked);
         }
+
+        private void EncryptionSelect_SelectedIndexChanged(object sender, EventArgs e)
+        {
+
+        }
     }
 }

shadowsocks-csharp/shadowsocks-csharp.csproj

@@ -240,6 +240,7 @@
     <Compile Include="Encryption\OpenSSL.cs" />
     <Compile Include="Encryption\RNG.cs" />
     <Compile Include="Encryption\Sodium.cs" />
+    <Compile Include="Encryption\Stream\PlainEncryptor.cs" />
     <Compile Include="Localization\LocalizationProvider.cs" />
     <Compile Include="Localization\Strings.Designer.cs">
       <AutoGen>True</AutoGen>