Converted from Python

// converted from Python: http://pastebin.com/w9QNLreT

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

public class glfsr
{
    int polynom;
    int mask;
    int data;

    public glfsr(int polynom, int initial_value)
    {
        int tmp;

        this.polynom = polynom | 1;
        this.data = initial_value;
        tmp = polynom;

        this.mask = 1;

        while(tmp != 0) {
            if((tmp & this.mask) != 0)
            {
                tmp = tmp ^ this.mask;
            }

            if(tmp == 0)
            {
                break;
            }

            this.mask = this.mask << 1;
        }
    }

    public int next_state()
    {
        this.data = this.data << 1;

        int retval = 0;

        if((this.data & this.mask) != 0)
        {
            retval = 1;
            this.data = this.data ^ this.polynom;
        }

        return retval;
    }
}

public class sprng
{
    glfsr glfsr_d;
    glfsr glfsr_c;

    public sprng(int polynom_d, int init_value_d, int polynom_c, int init_value_c)
    {
        this.glfsr_d = new glfsr(polynom_d, init_value_d);
        this.glfsr_c = new glfsr(polynom_c, init_value_c);
    }

    public int next_byte()
    {
        int byte_ = 0;
        int bitpos = 7;

        while(1 == 1)
        {
            int bit_d = this.glfsr_d.next_state();
            int bit_c = this.glfsr_c.next_state();

            if(bit_c != 0)
            {
                int bit_r = bit_d;
                byte_ = byte_ | (bit_r << bitpos);

                bitpos = bitpos - 1;

                if(bitpos < 0)
                {
                    break;
                }
            }
        }

        return byte_;
    }
}

//# ----------------------------------------------------------------------------
//# Crypto4o functions end here
//# ----------------------------------------------------------------------------

class test
{
    static void Main(String[] args)
    {
        String s;
        char random_ch;
        char input_ch;

        sprng prng = new sprng(
                    Convert.ToInt32(args[3], 16),
                    Convert.ToInt32(args[4], 16),
                    Convert.ToInt32(args[5], 16),
                    Convert.ToInt32(args[6], 16)
                    );

        s = String.Format("GLFSR D0: using polynom 0x%X, initial value: 0x%X.", Convert.ToInt32(args[3], 16), Convert.ToInt32(args[4], 16));
        Console.WriteLine(s);

        s = String.Format("GLFSR C0: using polynom 0x%X, initial value: 0x%X.", Convert.ToInt32(args[5], 16), Convert.ToInt32(args[6], 16));
        Console.Write(s);

        StreamReader f = new StreamReader(args[1]);
        StreamWriter g = new StreamWriter(args[2]);

        while(!f.EndOfStream)
        {
            input_ch = (char)f.Read();

            random_ch = (char)(prng.next_byte() & 0xff);
            g.Write((char)((int)input_ch ^ random_ch));
        }
    }
}