SHA256 64 位加密

　　　　　/// <summary>
        /// SHA256 64位加密
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static string GetSHA256hash(string input)
        {
            using (SHA256 sha256 = new SHA256Managed())
            {
                byte[] clearBytes = Encoding.UTF8.GetBytes(input);
                var hs = sha256.ComputeHash(clearBytes);
                return BitConverter.ToString(hs).Replace("-", "").ToLower();
            }
        }