CalculateHash.cs

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

namespace Hashbrown
{
    internal static class CalculateHash
    {
        internal static string CalculateMD5(string filename)
        {
            using (var md5 = MD5.Create())
            {
                using (var stream = File.OpenRead(filename))
                {
                    var hash = md5.ComputeHash(stream);
                    return BitConverter.ToString(hash).Replace("-", "").ToLowerInvariant();
                }
            }
        }
        internal static string CalculateSHA1(string filename)
        {
            using (var sha1 = SHA1.Create())
            {
                using (var stream = File.OpenRead(filename))
                {
                    var hash = sha1.ComputeHash(stream);
                    return BitConverter.ToString(hash).Replace("-", "").ToLowerInvariant();
                }
            }
        }
        internal static string CalculateSHA256(string filename)
        {
            using (var sha256 = SHA256.Create())
            {
                using (var stream = File.OpenRead(filename))
                {
                    var hash = sha256.ComputeHash(stream);
                    return BitConverter.ToString(hash).Replace("-", "").ToLowerInvariant();
                }
            }
        }
        internal static string CalculateSHA512(string filename)
        {
            using (var sha512 = SHA512.Create())
            {
                using (var stream = File.OpenRead(filename))
                {
                    var hash = sha512.ComputeHash(stream);
                    return BitConverter.ToString(hash).Replace("-", "").ToLowerInvariant();
                }
            }
        }
        internal static string CalculateCRC32(string filename)
        {
            var crc32 = new Crc32();

            using (var stream = File.OpenRead(filename))
            {
                var hash = crc32.ComputeHash(stream);
                return BitConverter.ToString(hash).Replace("-", "").ToLowerInvariant();
            }
        }
    }
}