Browse Source

remove duplicated RC4

tags/2.3
clowwindy 10 years ago
parent
commit
fe7bc5fbaf
2 changed files with 2 additions and 71 deletions
  1. +0
    -70
      shadowsocks-csharp/RC4.cs
  2. +2
    -1
      shadowsocks-csharp/shadowsocks-csharp.csproj

+ 0
- 70
shadowsocks-csharp/RC4.cs View File

@@ -1,70 +0,0 @@
using System;
using System.Collections.Generic;
using System.Text;

namespace shadowsocks_csharp
{
public class RC4
{
class Context
{
public int index1 = 0;
public int index2 = 0;
}

private Context enc_ctx = new Context();
private Context dec_ctx = new Context();

public void Encrypt(byte[] table, byte[] data, int length)
{
EncryptOutput(enc_ctx, table, data, length);
}

public void Decrypt(byte[] table, byte[] data, int length)
{
EncryptOutput(dec_ctx, table, data, length);
}

public byte[] EncryptInitalize(byte[] key)
{
byte[] s = new byte[256];

for (int i = 0; i < 256; i++)
{
s[i] = (byte)i;
}

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 void EncryptOutput(Context ctx, byte[] s, byte[] data, int length)
{
for (int n = 0; n < length; n++)
{
byte b = data[n];

ctx.index1 = (ctx.index1 + 1) & 255;
ctx.index2 = (ctx.index2 + s[ctx.index1]) & 255;

Swap(s, ctx.index1, ctx.index2);

data[n] = (byte)(b ^ s[(s[ctx.index1] + s[ctx.index2]) & 255]);
}
}

private static void Swap(byte[] s, int i, int j)
{
byte c = s[i];

s[i] = s[j];
s[j] = c;
}
}
}

+ 2
- 1
shadowsocks-csharp/shadowsocks-csharp.csproj View File

@@ -88,7 +88,6 @@
<Compile Include="Encrypt\TableEncryptor.cs" />
<Compile Include="Encrypt\IEncryptor.cs" />
<Compile Include="PACServer.cs" />
<Compile Include="RC4.cs" />
<Compile Include="Config.cs" />
<Compile Include="Form1.cs">
<SubType>Form</SubType>
@@ -126,6 +125,8 @@
<Compile Include="simple-json\src\SimpleJson\SimpleJson.cs" />
</ItemGroup>
<ItemGroup>
<None Include="polipo.exe" />
<None Include="config.txt" />
<Content Include="icon144.ico" />
<None Include="proxy.pac.txt" />
</ItemGroup>


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