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Added RC4 encryption implementation

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Tal Aloni 2017-02-27 18:59:37 +02:00
parent 18979ae15f
commit de6458ca5f
3 changed files with 198 additions and 0 deletions
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72
SMBLibrary/Authentication/NTLM/Helpers/RC4.cs Normal file
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/* 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;
}
}
}

2
SMBLibrary/SMBLibrary.csproj
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@ -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" />

124
SMBLibrary/Tests/RC4Tests.cs Normal file
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/* 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);
}
}
}