C# .NET: Security functions

Security.cs

// --------------------------------------------------------------------------------------------------------------------
// <copyright file="Security.cs" company="">
//   
// </copyright>
// <summary>
//   Class to manage security functions, such as Base64 encode/decode, SHA encryption, etc.
//   Requires the Random String Generator class.
// </summary>
// --------------------------------------------------------------------------------------------------------------------

namespace Domain.Library
{
    using System;
    using System.Security.Cryptography;
    using System.Text;

    /// <summary>
    /// The Security class itself
    /// </summary>
    public static class Security
    {
        #region Public Methods

        /// <summary>
        /// Decode Base64 string to normal
        /// </summary>
        /// <param name="toDecode">
        /// String to decode
        /// </param>
        /// <returns>
        /// Decoded string
        /// </returns>
        public static string Base64Decode(string toDecode)
        {
            byte[] encodedDataAsBytes = Convert.FromBase64String(toDecode);
            return Encoding.ASCII.GetString(encodedDataAsBytes);
        }

        /// <summary>
        /// Encode to Base64 string
        /// </summary>
        /// <param name="toEncode">
        /// String to encode
        /// </param>
        /// <returns>
        /// Encoded string
        /// </returns>
        public static string Base64Encode(string toEncode)
        {
            byte[] toEncodeAsBytes = Encoding.ASCII.GetBytes(toEncode);
            return Convert.ToBase64String(toEncodeAsBytes);
        }

        /// <summary>
        /// Use the Random String Generator to create a password
        /// </summary>
        /// <returns>
        /// The generate password.
        /// </returns>
        public static string GeneratePassword()
        {
            return RandomStringGenerator.Generate(10);
        }

        /// <summary>
        /// Generates salt based on timestamp.
        /// </summary>
        /// <returns>
        /// Base64 encoded salt
        /// </returns>
        public static string GenerateSalt()
        {
            return Base64Encode(Sha512Hash(DateTime.Now.ToString()));
        }

        /// <summary>
        /// Generate SHA512 hashed string by provided salt
        /// </summary>
        /// <param name="password">
        /// Password to be hashed
        /// </param>
        /// <param name="salt">
        /// Salt to be added to password
        /// </param>
        /// <returns>
        /// SHA512 hashed password
        /// </returns>
        public static string HashPassword(string password, string salt)
        {
            return Sha512Hash(salt + password);
        }

        /// <summary>
        /// Generate a SHA512 hashed string
        /// </summary>
        /// <param name="toHash">
        /// String to hash
        /// </param>
        /// <returns>
        /// SHA512 hashed string
        /// </returns>
        public static string Sha512Hash(string toHash)
        {
            var encoding = new UTF8Encoding();
            byte[] data = encoding.GetBytes(toHash);
            var cryptoServiceProvider = new SHA512CryptoServiceProvider();
            return BitConverter.ToString(cryptoServiceProvider.ComputeHash(data));
        }

        #endregion
    }
}