From 41c5c5a483b2627c3f280fa1429cbfc1a6ed8e56 Mon Sep 17 00:00:00 2001
From: clowwindy <clowwindy42@gmail.com>
Date: Thu, 6 Nov 2014 00:57:49 +0800
Subject: [PATCH] add polarssl

---
 polarssl/polarssl.dll                         | Bin 0 -> 40677 bytes
 .../Encrypt/EncryptorFactory.cs               |   2 +-
 shadowsocks-csharp/Encrypt/PolarSSL.cs        |  44 ++++
 .../Encrypt/PolarSSLEncryptor.cs              | 219 ++++++++++++++++++
 shadowsocks-csharp/shadowsocks-csharp.csproj  |   2 +
 5 files changed, 266 insertions(+), 1 deletion(-)
 create mode 100755 polarssl/polarssl.dll
 create mode 100755 shadowsocks-csharp/Encrypt/PolarSSL.cs
 create mode 100755 shadowsocks-csharp/Encrypt/PolarSSLEncryptor.cs

diff --git a/polarssl/polarssl.dll b/polarssl/polarssl.dll
new file mode 100755
index 0000000000000000000000000000000000000000..d64fa6dca4725e4610c98e4d17c65c69bd04d177
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/shadowsocks-csharp/Encrypt/EncryptorFactory.cs b/shadowsocks-csharp/Encrypt/EncryptorFactory.cs
index df3a975c..58d77715 100644
--- a/shadowsocks-csharp/Encrypt/EncryptorFactory.cs
+++ b/shadowsocks-csharp/Encrypt/EncryptorFactory.cs
@@ -10,7 +10,7 @@ namespace shadowsocks_csharp.Encrypt
                 return new TableEncryptor(method, password);
             }
 
-            return new OpensslEncryptor(method, password);
+            return new PolarSSLEncryptor(method, password);
         }
     }
 }
diff --git a/shadowsocks-csharp/Encrypt/PolarSSL.cs b/shadowsocks-csharp/Encrypt/PolarSSL.cs
new file mode 100755
index 00000000..b20117b5
--- /dev/null
+++ b/shadowsocks-csharp/Encrypt/PolarSSL.cs
@@ -0,0 +1,44 @@
+using System;
+using System.Collections.Generic;
+using System.Runtime.InteropServices;
+using System.Text;
+
+namespace shadowsocks_csharp.Encrypt
+{
+    public class PolarSSL
+    {
+        const string DLLNAME = "polarssl";
+
+        public const int AES_CTX_SIZE = 8 + 4 * 68;
+        public const int AES_ENCRYPT = 1;
+        public const int AES_DECRYPT = 0;
+
+        [DllImport(DLLNAME, CallingConvention = CallingConvention.Cdecl)]
+        public extern static void aes_init(byte[] ctx);
+
+        [DllImport(DLLNAME, CallingConvention = CallingConvention.Cdecl)]
+        public extern static void aes_free(byte[] ctx);
+
+        [DllImport(DLLNAME, CallingConvention = CallingConvention.Cdecl)]
+        public extern static int aes_setkey_enc(byte[] ctx, byte[] key, int keysize);
+
+        [DllImport(DLLNAME, CallingConvention = CallingConvention.Cdecl)]
+        public extern static int aes_crypt_cfb128(byte[] ctx, int mode, int length, ref int iv_off, byte[] iv, byte[] input, byte[] output);
+
+
+        public const int ARC4_CTX_SIZE = 264;
+
+        [DllImport(DLLNAME, CallingConvention = CallingConvention.Cdecl)]
+        public extern static void arc4_init(byte[] ctx);
+
+        [DllImport(DLLNAME, CallingConvention = CallingConvention.Cdecl)]
+        public extern static void arc4_free(byte[] ctx);
+
+        [DllImport(DLLNAME, CallingConvention = CallingConvention.Cdecl)]
+        public extern static void arc4_setup(byte[] ctx, byte[] key, int keysize);
+
+        [DllImport(DLLNAME, CallingConvention = CallingConvention.Cdecl)]
+        public extern static int arc4_crypt(byte[] ctx, int length, byte[] input, byte[] output);
+
+    }
+}
diff --git a/shadowsocks-csharp/Encrypt/PolarSSLEncryptor.cs b/shadowsocks-csharp/Encrypt/PolarSSLEncryptor.cs
new file mode 100755
index 00000000..d1a3a78f
--- /dev/null
+++ b/shadowsocks-csharp/Encrypt/PolarSSLEncryptor.cs
@@ -0,0 +1,219 @@
+using System;
+using System.Collections.Generic;
+using System.Runtime.InteropServices;
+using System.Security.Cryptography;
+using System.Text;
+
+namespace shadowsocks_csharp.Encrypt
+{
+    public class PolarSSLEncryptor
+        : EncryptorBase, IDisposable
+    {
+        const int CIPHER_AES = 1;
+        const int CIPHER_RC4 = 2;
+        const int CIPHER_BF = 3;
+
+        static Dictionary<string, int[]> ciphers = new Dictionary<string, int[]> {
+            {"aes-128-cfb", new int[]{16, 16, CIPHER_AES, PolarSSL.AES_CTX_SIZE}},
+            {"aes-192-cfb", new int[]{24, 16, CIPHER_AES, PolarSSL.AES_CTX_SIZE}},
+            {"aes-256-cfb", new int[]{32, 16, CIPHER_AES, PolarSSL.AES_CTX_SIZE}},
+            //{"bf-cfb", new int[]{16, 8, CIPHER_BF, PolarSSL.BF_CTX_SIZE}},
+            {"rc4", new int[]{16, 0, CIPHER_RC4, PolarSSL.ARC4_CTX_SIZE}},
+            {"rc4-md5", new int[]{16, 16, CIPHER_RC4, PolarSSL.ARC4_CTX_SIZE}},
+        };
+
+        private static readonly Dictionary<string, byte[]> CachedKeys = new Dictionary<string, byte[]>();
+        private int _cipher;
+        private int[] _cipherInfo;
+        private byte[] _key;
+        private byte[] _encryptCtx;
+        private byte[] _decryptCtx;
+        private byte[] _encryptIV;
+        private byte[] _decryptIV;
+        private int _encryptIVOffset;
+        private int _decryptIVOffset;
+        private string _method;
+        private int keyLen;
+        private int ivLen;
+
+        public PolarSSLEncryptor(string method, string password)
+            : base(method, password)
+        {
+            InitKey(method, password);
+        }
+
+        private static void randBytes(byte[] buf, int length)
+        {
+            byte[] temp = new byte[length];
+            new Random().NextBytes(temp);
+            temp.CopyTo(buf, 0);
+        }
+
+        private void bytesToKey(byte[] password, byte[] key)
+        {
+            byte[] result = new byte[password.Length + 16];
+            int i = 0;
+            byte[] md5sum = null;
+            while (i < key.Length)
+            {
+                MD5 md5 = MD5.Create();
+                if (i == 0)
+                {
+                    md5sum = md5.ComputeHash(password);
+                }
+                else
+                {
+                    md5sum.CopyTo(result, 0);
+                    password.CopyTo(result, md5sum.Length);
+                    md5sum = md5.ComputeHash(result);
+                }
+                md5sum.CopyTo(key, i);
+                i += md5sum.Length;
+            }
+        }
+
+        private void InitKey(string method, string password)
+        {
+            method = method.ToLower();
+            _method = method;
+            string k = method + ":" + password;
+            _cipherInfo = ciphers[_method];
+            _cipher = _cipherInfo[2];
+            if (_cipher == 0)
+            {
+                throw new Exception("method not found");
+            }
+            keyLen = ciphers[_method][0];
+            ivLen = ciphers[_method][1];
+            if (CachedKeys.ContainsKey(k))
+            {
+                _key = CachedKeys[k];
+            }
+            else
+            {
+                byte[] passbuf = Encoding.UTF8.GetBytes(password);
+                _key = new byte[32];
+                byte[] iv = new byte[16];
+                bytesToKey(passbuf, _key);
+                CachedKeys[k] = _key;
+            }
+        }
+
+        private void InitCipher(ref byte[] ctx, byte[] iv, bool isCipher)
+        {
+            ctx = new byte[_cipherInfo[3]];
+            byte[] realkey;
+            if (_method == "rc4-md5")
+            {
+                byte[] temp = new byte[keyLen + ivLen];
+                realkey = new byte[keyLen];
+                Array.Copy(_key, 0, temp, 0, keyLen);
+                Array.Copy(iv, 0, temp, keyLen, ivLen);
+                realkey = MD5.Create().ComputeHash(temp);
+            }
+            else
+            {
+                realkey = _key;
+            }
+            if (_cipher == CIPHER_AES)
+            {
+                PolarSSL.aes_init(ctx);
+                if (isCipher)
+                {
+                    // PolarSSL takes key length by bit
+                    PolarSSL.aes_setkey_enc(ctx, realkey, keyLen * 8);
+                    _encryptIV = new byte[ivLen];
+                    Array.Copy(iv, _encryptIV, ivLen);
+                }
+                else
+                {
+                    // PolarSSL takes key length by bit
+                    // since we'll use CFB mode, here we also do enc, not dec
+                    PolarSSL.aes_setkey_enc(ctx, realkey, keyLen * 8);
+                    _decryptIV = new byte[ivLen];
+                    Array.Copy(iv, _decryptIV, ivLen);
+                }
+            }
+            else if (_cipher == CIPHER_RC4)
+            {
+                PolarSSL.arc4_init(ctx);
+                PolarSSL.arc4_setup(ctx, realkey, keyLen);
+            }
+        }
+
+
+
+        static byte[] tempbuf = new byte[32768];
+
+        public override void Encrypt(byte[] buf, int length, byte[] outbuf, out int outlength)
+        {
+            if (_encryptCtx == null)
+            {
+                randBytes(outbuf, ivLen);
+                InitCipher(ref _encryptCtx, outbuf, true);
+                outlength = length + ivLen;
+                switch (_cipher)
+                {
+                    case CIPHER_AES:
+                        PolarSSL.aes_crypt_cfb128(_encryptCtx, PolarSSL.AES_ENCRYPT, length, ref _encryptIVOffset, _encryptIV, buf, tempbuf);
+                        break;
+                    case CIPHER_RC4:
+                        PolarSSL.arc4_crypt(_encryptCtx, length, buf, tempbuf);
+                        break;
+                }
+                outlength = length + ivLen;
+                Buffer.BlockCopy(tempbuf, 0, outbuf, ivLen, outlength);
+            }
+            else
+            {
+                outlength = length;
+                switch (_cipher)
+                {
+                    case CIPHER_AES:
+                        PolarSSL.aes_crypt_cfb128(_encryptCtx, PolarSSL.AES_ENCRYPT, length, ref _encryptIVOffset, _encryptIV, buf, outbuf);
+                        break;
+                    case CIPHER_RC4:
+                        PolarSSL.arc4_crypt(_encryptCtx, length, buf, outbuf);
+                        break;
+                }
+            }
+        }
+
+        public override void Decrypt(byte[] buf, int length, byte[] outbuf, out int outlength)
+        {
+            if (_decryptCtx == null)
+            {
+                InitCipher(ref _decryptCtx, buf, false);
+                outlength = length - ivLen;
+                Buffer.BlockCopy(buf, ivLen, tempbuf, 0, length - ivLen);
+                switch (_cipher)
+                {
+                    case CIPHER_AES:
+                        PolarSSL.aes_crypt_cfb128(_decryptCtx, PolarSSL.AES_DECRYPT, length - ivLen, ref _decryptIVOffset, _decryptIV, tempbuf, outbuf);
+                        break;
+                    case CIPHER_RC4:
+                        PolarSSL.arc4_crypt(_decryptCtx, length - ivLen, tempbuf, outbuf);
+                        break;
+                }
+            }
+            else
+            {
+                outlength = length;
+                switch (_cipher)
+                {
+                    case CIPHER_AES:
+                        PolarSSL.aes_crypt_cfb128(_decryptCtx, PolarSSL.AES_DECRYPT, length, ref _decryptIVOffset, _decryptIV, buf, outbuf);
+                        break;
+                    case CIPHER_RC4:
+                        PolarSSL.arc4_crypt(_decryptCtx, length, buf, outbuf);
+                        break;
+                }
+            }
+        }
+
+
+        public override void Dispose()
+        {
+        }
+    }
+}
diff --git a/shadowsocks-csharp/shadowsocks-csharp.csproj b/shadowsocks-csharp/shadowsocks-csharp.csproj
index 169d0ef3..28aba093 100755
--- a/shadowsocks-csharp/shadowsocks-csharp.csproj
+++ b/shadowsocks-csharp/shadowsocks-csharp.csproj
@@ -85,6 +85,8 @@
     <Compile Include="Encrypt\EncryptorFactory.cs" />
     <Compile Include="Encrypt\OpenSSL.cs" />
     <Compile Include="Encrypt\OpensslEncryptor.cs" />
+    <Compile Include="Encrypt\PolarSSL.cs" />
+    <Compile Include="Encrypt\PolarSSLEncryptor.cs" />
     <Compile Include="Encrypt\TableEncryptor.cs" />
     <Compile Include="Encrypt\IEncryptor.cs" />
     <Compile Include="PACServer.cs" />