Get File Checksum : Checksum « Security « C# / C Sharp






Get File Checksum

 
///////////////////////////////////////////////////////////////////////////////////////////////
//
//    This File is Part of the CallButler Open Source PBX (http://www.codeplex.com/callbutler
//
//    Copyright (c) 2005-2008, Jim Heising
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///////////////////////////////////////////////////////////////////////////////////////////////

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

namespace WOSI.Utilities
{
  /// <summary>
  /// Summary description for CryptoUtils.
  /// </summary>
  public class CryptoUtils
  {
        public static byte[] GetFileBytes(string filename)
        {
           if (File.Exists(filename))
            {
                FileStream fs = File.Open(filename, FileMode.Open, FileAccess.Read);

                byte[] fileBytes = new byte[fs.Length];

                fs.Read(fileBytes, 0, (int)fs.Length);

                fs.Close();

                return fileBytes;
            }

            return null;
        }

        public static string GetByteChecksum(byte[] bytes)
        {
            MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();

            byte[] hashValue = md5.ComputeHash(bytes);

            return Convert.ToBase64String(hashValue); 
        }
        public static string GetFileChecksum(string filename)
        {
            if (File.Exists(filename))
            {
                MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();

                byte[] fileBytes = GetFileBytes(filename);
                return GetByteChecksum(fileBytes); 
            }

            return "";
        }
   }
}

   
  








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