DCP Hash Checker Using C#

using System;
using System.IO;
using System.Text;
using System.Security.Cryptography;

/**
 * This one is SHA1 Checker, the one I use to verify DCP PackingList
 * You can use it (or modify it) freely to meet your own needs.
 *
 * Usually tools like EasyDCP only load PKL_*.xml to search for main
 * mxf files, plus another XML starting with CPL_.
 *
 * Computing SHA1 for those mxf is the longest process, so it won't hurt
 * even if we compute all files refer to by the PKL.
 *
 * Unlike MD5, SHA1 required by DCP uses base64 encoding string,
 * so we must use the following call to convert the bytes returned by
 * SHA1::ComputeHash().
 *
 * On Linux you can use a simple command like the following without
 * the need for extra program like this one:
 *
 *    sha1sum [filename].mxf | xxd -r -p | base64
 *
 * But we can also use these codes with Mono and put a nice UI if you want.
 * :)
*/

class SHATest64
{
    static void Main(string[] args)
    {
        string appName = System.Diagnostics.Process.GetCurrentProcess().ProcessName;
        if (args.Length == 0)
        {
            Console.WriteLine(appName + " [filename]");
            return;
        }
        SHA1 sha = SHA1.Create();
        if (File.Exists(args[0]))
        {
            FileStream fs = File.OpenRead(args[0]);
            byte[] data = sha.ComputeHash(fs);
            string strBase64 =  System.Convert.ToBase64String(data);
            Console.Write("Base64 SHA1 Hash: ");
            ConsoleColor fg = Console.ForegroundColor;
            Console.ForegroundColor = ConsoleColor.Yellow;
            Console.Write(strBase64 + "\n");
            Console.ForegroundColor = fg;
        }
    }
}