HashExtensions.cs

// Copyright (c) Brock Allen & Dominick Baier. All rights reserved.
// Licensed under the Apache License, Version 2.0. See LICENSE in the project root for license information.


using IdentityServer4.Extensions;
using System;
using System.Security.Cryptography;
using System.Text;

namespace IdentityServer4.Models
{
    /// <summary>
    /// Extension methods for hashing strings
    /// </summary>
    public static class HashExtensions
    {
        /// <summary>
        /// Creates a SHA256 hash of the specified input.
        /// </summary>
        /// <param name="input">The input.</param>
        /// <returns>A hash</returns>
        public static string Sha256(this string input)
        {
            if (input.IsMissing()) return string.Empty;

            using (var sha = SHA256.Create())
            {
                var bytes = Encoding.UTF8.GetBytes(input);
                var hash = sha.ComputeHash(bytes);

                return Convert.ToBase64String(hash);
            }
        }

        /// <summary>
        /// Creates a SHA256 hash of the specified input.
        /// </summary>
        /// <param name="input">The input.</param>
        /// <returns>A hash.</returns>
        public static byte[] Sha256(this byte[] input)
        {
            if (input == null)
            {
                return null;
            }

            using (var sha = SHA256.Create())
            {
                return sha.ComputeHash(input);
            }
        }

        /// <summary>
        /// Creates a SHA512 hash of the specified input.
        /// </summary>
        /// <param name="input">The input.</param>
        /// <returns>A hash</returns>
        public static string Sha512(this string input)
        {
            if (input.IsMissing()) return string.Empty;

            using (var sha = SHA512.Create())
            {
                var bytes = Encoding.UTF8.GetBytes(input);
                var hash = sha.ComputeHash(bytes);

                return Convert.ToBase64String(hash);
            }
        }
    }
}