public override void Write(byte[] buffer, int offset, int count)
{
byte[] dst = new byte[count];
Buffer.BlockCopy(buffer, offset, dst, 0, count);
RC4ex.RC4(ref dst, this.RC4Key);
this.stream.Write(dst, 0, count);
}
private byte[] RC4HMACDecrypt(byte[] key, int keyLen, byte[] data, int dataLen, int Idk)
{
HMACMD5 hmacmd = new HMACMD5(key);
byte[] bytes = BitConverter.GetBytes(Idk);
byte[] buffer2 = hmacmd.ComputeHash(bytes, 0, 4);
byte[] destinationArray = new byte[0x10];
Array.Copy(data, destinationArray, 0x10);
byte[] buffer4 = new byte[data.Length - 0x10];
Array.Copy(data, 0x10, buffer4, 0, data.Length - 0x10);
hmacmd.Key = buffer2;
byte[] buffer5 = hmacmd.ComputeHash(destinationArray);
RC4ex.RC4(ref buffer4, buffer5);
return(buffer4);
}
public override int Read(byte[] buffer, int offset, int count)
{
byte[] buffer2 = new byte[count];
int num = this.stream.Read(buffer2, 0, count);
while (num != count)
{
int num2 = this.stream.Read(buffer2, num, count - num);
if (num2 <= 0)
{
break;
}
num += num2;
}
RC4ex.RC4(ref buffer2, this.RC4Key);
Buffer.BlockCopy(buffer2, 0, buffer, offset, num);
return(num);
}
private byte[] RC4HMACEncrypt(byte[] key, int keyLen, byte[] data, int dataLen, int Idk)
{
HMACMD5 hmacmd = new HMACMD5(key);
byte[] bytes = BitConverter.GetBytes(Idk);
byte[] buffer2 = hmacmd.ComputeHash(bytes, 0, 4);
byte[] sourceArray = Conversion.HexStringToBytes("9b6bfacb5c488190");
byte[] destinationArray = new byte[data.Length + 8];
Array.Copy(sourceArray, destinationArray, 8);
Array.Copy(data, 0, destinationArray, 8, data.Length);
hmacmd.Key = buffer2;
byte[] buffer = hmacmd.ComputeHash(destinationArray);
byte[] buffer6 = hmacmd.ComputeHash(buffer);
RC4ex.RC4(ref destinationArray, buffer6);
byte[] buffer7 = new byte[dataLen + 0x18];
Array.Copy(buffer, 0, buffer7, 0, 0x10);
Array.Copy(destinationArray, 0, buffer7, 0x10, destinationArray.Length);
return(buffer7);
}