Added RC4 encryption implementation

SMBLibrary/Authentication/NTLM/Helpers/RC4.cs

@@ -0,0 +1,72 @@
+/* Copyright (C) 2017 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.
+ * 
+ * Based on: https://bitlush.com/blog/rc4-encryption-in-c-sharp
+ */
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace System.Security.Cryptography
+{
+    public class RC4
+    {
+        public static byte[] Encrypt(byte[] key, byte[] data)
+        {
+            return EncryptOutput(key, data);
+        }
+
+        public static byte[] Decrypt(byte[] key, byte[] data)
+        {
+            return EncryptOutput(key, data);
+        }
+
+        private static byte[] EncryptInitalize(byte[] key)
+        {
+            byte[] s = new byte[256];
+            for (int index = 0; index < 256; index++)
+            {
+                s[index] = (byte)index;
+            }
+
+            for (int i = 0, j = 0; i < 256; i++)
+            {
+                j = (j + key[i % key.Length] + s[i]) & 255;
+
+                Swap(s, i, j);
+            }
+
+            return s;
+        }
+
+        private static byte[] EncryptOutput(byte[] key, byte[] data)
+        {
+            byte[] s = EncryptInitalize(key);
+
+            int i = 0;
+            int j = 0;
+
+            byte[] output = new byte[data.Length];
+            for (int index = 0; index < data.Length; index++)
+            {
+                i = (i + 1) & 255;
+                j = (j + s[i]) & 255;
+
+                Swap(s, i, j);
+                output[index] = (byte)(data[index] ^ s[(s[i] + s[j]) & 255]);
+            }
+            return output;
+        }
+
+        private static void Swap(byte[] s, int i, int j)
+        {
+            byte c = s[i];
+
+            s[i] = s[j];
+            s[j] = c;
+        }
+    }
+}

SMBLibrary/SMBLibrary.csproj

@@ -42,6 +42,7 @@
     <Compile Include="Authentication\NTLM\Helpers\AVPairUtils.cs" />
     <Compile Include="Authentication\NTLM\Helpers\MD4.cs" />
     <Compile Include="Authentication\NTLM\Helpers\NTLMCryptography.cs" />
+    <Compile Include="Authentication\NTLM\Helpers\RC4.cs" />
     <Compile Include="Authentication\NTLM\IndependentNTLMAuthenticationProvider.cs" />
     <Compile Include="Authentication\NTLM\NTLMAuthenticationProviderBase.cs" />
     <Compile Include="Authentication\NTLM\Structures\AuthenticateMessage.cs" />
@@ -531,6 +532,7 @@
     <Compile Include="SMB2\Structures\NegotiateContext.cs" />
     <Compile Include="Tests\AuthenticationTests.cs" />
     <Compile Include="Tests\NetBiosTests.cs" />
+    <Compile Include="Tests\RC4Tests.cs" />
     <Compile Include="Tests\RPCTests.cs" />
     <Compile Include="Utilities\LogEntry.cs" />
     <Compile Include="Utilities\PrefetchedStream.cs" />

SMBLibrary/Tests/RC4Tests.cs

@@ -0,0 +1,124 @@
+/* Copyright (C) 2017 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;
+using System.Collections.Generic;
+using System.Security.Cryptography;
+using Utilities;
+
+namespace SMBLibrary
+{
+    /// <summary>
+    /// https://tools.ietf.org/id/draft-kaukonen-cipher-arcfour-03.txt
+    /// Test Vectors from Appendix A
+    /// </summary>
+    public class RC4Tests
+    {
+        public static bool Test1()
+        {
+            byte[] key = new byte[] { 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF };
+            byte[] text = new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+            byte[] expectedCipher = new byte[] { 0x74, 0x94, 0xC2, 0xE7, 0x10, 0x4B, 0x08, 0x79 };
+            byte[] cipher = RC4.Encrypt(key, text);
+            return ByteUtils.AreByteArraysEqual(cipher, expectedCipher);
+        }
+
+        public static bool Test2()
+        {
+            byte[] key = new byte[] { 0x61, 0x8A, 0x63, 0xD2, 0xFB };
+            byte[] text = new byte[] { 0xDC, 0xEE, 0x4C, 0xF9, 0x2C };
+            byte[] expectedCipher = new byte[] { 0xF1, 0x38, 0x29, 0xC9, 0xDE };
+            byte[] cipher = RC4.Encrypt(key, text);
+            return ByteUtils.AreByteArraysEqual(cipher, expectedCipher);
+        }
+
+        public static bool Test3()
+        {
+            byte[] key = new byte[] { 0x29, 0x04, 0x19, 0x72, 0xFB, 0x42, 0xBA, 0x5F,
+                                      0xC7, 0x12, 0x77, 0x12, 0xF1, 0x38, 0x29, 0xC9};
+            byte[] text = new byte[] { 0x52, 0x75, 0x69, 0x73, 0x6c, 0x69, 0x6e, 0x6e,
+                                       0x75, 0x6e, 0x20, 0x6c, 0x61, 0x75, 0x6c, 0x75,
+                                       0x20, 0x6b, 0x6f, 0x72, 0x76, 0x69, 0x73, 0x73,
+                                       0x73, 0x61, 0x6e, 0x69, 0x2c, 0x20, 0x74, 0xe4,
+                                       0x68, 0x6b, 0xe4, 0x70, 0xe4, 0x69, 0x64, 0x65,
+                                       0x6e, 0x20, 0x70, 0xe4, 0xe4, 0x6c, 0x6c, 0xe4,
+                                       0x20, 0x74, 0xe4, 0x79, 0x73, 0x69, 0x6b, 0x75,
+                                       0x75, 0x2e, 0x20, 0x4b, 0x65, 0x73, 0xe4, 0x79,
+                                       0xf6, 0x6e, 0x20, 0x6f, 0x6e, 0x20, 0x6f, 0x6e,
+                                       0x6e, 0x69, 0x20, 0x6f, 0x6d, 0x61, 0x6e, 0x61,
+                                       0x6e, 0x69, 0x2c, 0x20, 0x6b, 0x61, 0x73, 0x6b,
+                                       0x69, 0x73, 0x61, 0x76, 0x75, 0x75, 0x6e, 0x20,
+                                       0x6c, 0x61, 0x61, 0x6b, 0x73, 0x6f, 0x74, 0x20,
+                                       0x76, 0x65, 0x72, 0x68, 0x6f, 0x75, 0x75, 0x2e,
+                                       0x20, 0x45, 0x6e, 0x20, 0x6d, 0x61, 0x20, 0x69,
+                                       0x6c, 0x6f, 0x69, 0x74, 0x73, 0x65, 0x2c, 0x20,
+                                       0x73, 0x75, 0x72, 0x65, 0x20, 0x68, 0x75, 0x6f,
+                                       0x6b, 0x61, 0x61, 0x2c, 0x20, 0x6d, 0x75, 0x74,
+                                       0x74, 0x61, 0x20, 0x6d, 0x65, 0x74, 0x73, 0xe4,
+                                       0x6e, 0x20, 0x74, 0x75, 0x6d, 0x6d, 0x75, 0x75,
+                                       0x73, 0x20, 0x6d, 0x75, 0x6c, 0x6c, 0x65, 0x20,
+                                       0x74, 0x75, 0x6f, 0x6b, 0x61, 0x61, 0x2e, 0x20,
+                                       0x50, 0x75, 0x75, 0x6e, 0x74, 0x6f, 0x20, 0x70,
+                                       0x69, 0x6c, 0x76, 0x65, 0x6e, 0x2c, 0x20, 0x6d,
+                                       0x69, 0x20, 0x68, 0x75, 0x6b, 0x6b, 0x75, 0x75,
+                                       0x2c, 0x20, 0x73, 0x69, 0x69, 0x6e, 0x74, 0x6f,
+                                       0x20, 0x76, 0x61, 0x72, 0x61, 0x6e, 0x20, 0x74,
+                                       0x75, 0x75, 0x6c, 0x69, 0x73, 0x65, 0x6e, 0x2c,
+                                       0x20, 0x6d, 0x69, 0x20, 0x6e, 0x75, 0x6b, 0x6b,
+                                       0x75, 0x75, 0x2e, 0x20, 0x54, 0x75, 0x6f, 0x6b,
+                                       0x73, 0x75, 0x74, 0x20, 0x76, 0x61, 0x6e, 0x61,
+                                       0x6d, 0x6f, 0x6e, 0x20, 0x6a, 0x61, 0x20, 0x76,
+                                       0x61, 0x72, 0x6a, 0x6f, 0x74, 0x20, 0x76, 0x65,
+                                       0x65, 0x6e, 0x2c, 0x20, 0x6e, 0x69, 0x69, 0x73,
+                                       0x74, 0xe4, 0x20, 0x73, 0x79, 0x64, 0xe4, 0x6d,
+                                       0x65, 0x6e, 0x69, 0x20, 0x6c, 0x61, 0x75, 0x6c,
+                                       0x75, 0x6e, 0x20, 0x74, 0x65, 0x65, 0x6e, 0x2e,
+                                       0x20, 0x2d, 0x20, 0x45, 0x69, 0x6e, 0x6f, 0x20,
+                                       0x4c, 0x65, 0x69, 0x6e, 0x6f};
+            byte[] expectedCipher = new byte[] { 0x35, 0x81, 0x86, 0x99, 0x90, 0x01, 0xe6, 0xb5,
+                                                 0xda, 0xf0, 0x5e, 0xce, 0xeb, 0x7e, 0xee, 0x21,
+                                                 0xe0, 0x68, 0x9c, 0x1f, 0x00, 0xee, 0xa8, 0x1f,
+                                                 0x7d, 0xd2, 0xca, 0xae, 0xe1, 0xd2, 0x76, 0x3e,
+                                                 0x68, 0xaf, 0x0e, 0xad, 0x33, 0xd6, 0x6c, 0x26,
+                                                 0x8b, 0xc9, 0x46, 0xc4, 0x84, 0xfb, 0xe9, 0x4c,
+                                                 0x5f, 0x5e, 0x0b, 0x86, 0xa5, 0x92, 0x79, 0xe4,
+                                                 0xf8, 0x24, 0xe7, 0xa6, 0x40, 0xbd, 0x22, 0x32,
+                                                 0x10, 0xb0, 0xa6, 0x11, 0x60, 0xb7, 0xbc, 0xe9,
+                                                 0x86, 0xea, 0x65, 0x68, 0x80, 0x03, 0x59, 0x6b,
+                                                 0x63, 0x0a, 0x6b, 0x90, 0xf8, 0xe0, 0xca, 0xf6,
+                                                 0x91, 0x2a, 0x98, 0xeb, 0x87, 0x21, 0x76, 0xe8,
+                                                 0x3c, 0x20, 0x2c, 0xaa, 0x64, 0x16, 0x6d, 0x2c,
+                                                 0xce, 0x57, 0xff, 0x1b, 0xca, 0x57, 0xb2, 0x13,
+                                                 0xf0, 0xed, 0x1a, 0xa7, 0x2f, 0xb8, 0xea, 0x52,
+                                                 0xb0, 0xbe, 0x01, 0xcd, 0x1e, 0x41, 0x28, 0x67,
+                                                 0x72, 0x0b, 0x32, 0x6e, 0xb3, 0x89, 0xd0, 0x11,
+                                                 0xbd, 0x70, 0xd8, 0xaf, 0x03, 0x5f, 0xb0, 0xd8,
+                                                 0x58, 0x9d, 0xbc, 0xe3, 0xc6, 0x66, 0xf5, 0xea,
+                                                 0x8d, 0x4c, 0x79, 0x54, 0xc5, 0x0c, 0x3f, 0x34,
+                                                 0x0b, 0x04, 0x67, 0xf8, 0x1b, 0x42, 0x59, 0x61,
+                                                 0xc1, 0x18, 0x43, 0x07, 0x4d, 0xf6, 0x20, 0xf2,
+                                                 0x08, 0x40, 0x4b, 0x39, 0x4c, 0xf9, 0xd3, 0x7f,
+                                                 0xf5, 0x4b, 0x5f, 0x1a, 0xd8, 0xf6, 0xea, 0x7d,
+                                                 0xa3, 0xc5, 0x61, 0xdf, 0xa7, 0x28, 0x1f, 0x96,
+                                                 0x44, 0x63, 0xd2, 0xcc, 0x35, 0xa4, 0xd1, 0xb0,
+                                                 0x34, 0x90, 0xde, 0xc5, 0x1b, 0x07, 0x11, 0xfb,
+                                                 0xd6, 0xf5, 0x5f, 0x79, 0x23, 0x4d, 0x5b, 0x7c,
+                                                 0x76, 0x66, 0x22, 0xa6, 0x6d, 0xe9, 0x2b, 0xe9,
+                                                 0x96, 0x46, 0x1d, 0x5e, 0x4d, 0xc8, 0x78, 0xef,
+                                                 0x9b, 0xca, 0x03, 0x05, 0x21, 0xe8, 0x35, 0x1e,
+                                                 0x4b, 0xae, 0xd2, 0xfd, 0x04, 0xf9, 0x46, 0x73,
+                                                 0x68, 0xc4, 0xad, 0x6a, 0xc1, 0x86, 0xd0, 0x82,
+                                                 0x45, 0xb2, 0x63, 0xa2, 0x66, 0x6d, 0x1f, 0x6c,
+                                                 0x54, 0x20, 0xf1, 0x59, 0x9d, 0xfd, 0x9f, 0x43,
+                                                 0x89, 0x21, 0xc2, 0xf5, 0xa4, 0x63, 0x93, 0x8c,
+                                                 0xe0, 0x98, 0x22, 0x65, 0xee, 0xf7, 0x01, 0x79,
+                                                 0xbc, 0x55, 0x3f, 0x33, 0x9e, 0xb1, 0xa4, 0xc1,
+                                                 0xaf, 0x5f, 0x6a, 0x54, 0x7f};
+            byte[] cipher = RC4.Encrypt(key, text);
+            return ByteUtils.AreByteArraysEqual(cipher, expectedCipher);
+        }
+    }
+}