Hash.cs

using System;
using System.Text;

namespace Utility.Encryption
{
    public class Hash
    {
        /// <summary>
        /// Keeping this as an example and for backwards compatibility with another app
        /// </summary>
        /// <param name="input">Date you want hashed</param>
        /// <returns></returns>
        public static string CalculateMD5Hash(string input)
        {
            using (System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create())
            {
                return GetHash(md5, input);
            }
        }

        public static string GetHash(System.Security.Cryptography.HashAlgorithm hashAlgorithm, string input)
        {

            // Convert the input string to a byte array and compute the hash.
            byte[] data = hashAlgorithm.ComputeHash(Encoding.UTF8.GetBytes(input));

            // Create a new Stringbuilder to collect the bytes
            // and create a string.
            var sBuilder = new StringBuilder();

            // Loop through each byte of the hashed data
            // and format each one as a hexadecimal string.
            for (int i = 0; i < data.Length; i++)
            {
                sBuilder.Append(data[i].ToString("x2"));
            }

            // Return the hexadecimal string.
            return sBuilder.ToString();
        }

        // Verify a hash against a string.
        public static bool VerifyHash(System.Security.Cryptography.HashAlgorithm hashAlgorithm, string input, string hash)
        {
            // Hash the input.
            var hashOfInput = GetHash(hashAlgorithm, input);

            // Create a StringComparer an compare the hashes.
            StringComparer comparer = StringComparer.OrdinalIgnoreCase;

            return comparer.Compare(hashOfInput, hash) == 0;
        }

    }
}