Catel - Part 4 of n: Unit testing with Catel

// --------------------------------------------------------------------------------------------------------------------
// <copyright file="CryptHelper.cs" company="Catel development team">
//   Copyright (c) 2008 - 2011 Catel development team. All rights reserved.
// </copyright>
// <summary>
//   Cryptography class which handles most encryptions easily.
// </summary>
// --------------------------------------------------------------------------------------------------------------------

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

namespace Catel.Security.Cryptography
{
    /// <summary>
    /// Cryptography class which handles most encryptions easily.
    /// </summary>
    public static class CryptHelper
    {
        #region Methods
        /// <summary>
        /// Calculates the MD5 hash of a file.
        /// </summary>
        /// <param name="fileName">Path of the file to hash.</param>
        /// <returns>Hash of the file.</returns>
        public static string CalculateMD5FileHash(string fileName)
        {
            string result;
            string hashData;
            MD5CryptoServiceProvider md5Hasher = new MD5CryptoServiceProvider();

            try
            {
                using (FileStream fileStream = GetFileStream(fileName))
                {
					byte[] arrbytHashValue = md5Hasher.ComputeHash(fileStream);

					hashData = BitConverter.ToString(arrbytHashValue);
					hashData = hashData.Replace("-", string.Empty);
					result = hashData;	
                }
            }
            catch (Exception)
            {
                return string.Empty;
            }

            return result;
        }

        /// <summary>
        /// Calculates the MD5 hash of content.
        /// </summary>
        /// <param name="content">Content to hash.</param>
        /// <returns>Hash of the content.</returns>
        public static string CalculateMD5ContentHash(string content)
        {
            string result;
            string hashData;
        	MD5CryptoServiceProvider md5Hasher = new MD5CryptoServiceProvider();

            try
            {
                byte[] arrbytHashValue = md5Hasher.ComputeHash(ASCIIEncoding.UTF8.GetBytes(content));
                hashData = BitConverter.ToString(arrbytHashValue);
                hashData = hashData.Replace("-", string.Empty);
                result = hashData;
            }
            catch (Exception)
            {
                return string.Empty;
            }

            return result;
        }

        /// <summary>
        /// Reads the contents of a file so it can easily be hashes.
        /// </summary>
        /// <param name="pathName">Path of the file to hash.</param>
        /// <returns>Filestream of the file.</returns>
        private static FileStream GetFileStream(string pathName)
        {
        	return IO.File.OpenRead(pathName);
        }
        #endregion
    }
}