/*
 *
 * (c) Copyright Ascensio System Limited 2010-2018
 *
 * This program is freeware. You can redistribute it and/or modify it under the terms of the GNU 
 * General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html). 
 * In accordance with Section 7(a) of the GNU GPL its Section 15 shall be amended to the effect that 
 * Ascensio System SIA expressly excludes the warranty of non-infringement of any third-party rights.
 *
 * THIS PROGRAM IS DISTRIBUTED WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY OR
 * FITNESS FOR A PARTICULAR PURPOSE. For more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
 *
 * You can contact Ascensio System SIA by email at sales@onlyoffice.com
 *
 * The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display 
 * Appropriate Legal Notices, as required under Section 5 of the GNU GPL version 3.
 *
 * Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains 
 * relevant author attributions when distributing the software. If the display of the logo in its graphic 
 * form is not reasonably feasible for technical reasons, you must include the words "Powered by ONLYOFFICE" 
 * in every copy of the program you distribute. 
 * Pursuant to Section 7 § 3(e) we decline to grant you any rights under trademark law for use of our trademarks.
 *
*/


using System.Text;

namespace ASC.FederatedLogin.Helpers
{
    public class HashHelper
    {
        public static int CombineHashCodes(int hash1, int hash2)
        {
            if (hash2 == 0)
                return hash1;
            return (((hash1 << 5) + hash1) ^ hash2);
        }

        //Use this luke!!!
        public static int StringHash(string text)
        {
            return text.GetHashCode();
        }

        public static string MD5(string text)
        {
            return MD5(text, Encoding.Default);
        }

        public static string MD5(string text, Encoding encoding)
        {
            return MD5String(encoding.GetBytes(text));
        }

        public static string MD5String(byte[] data)
        {
            var hash = MD5(data);
            var sb = new StringBuilder();
            for (var i = 0; i < hash.Length; i++)
            {
                sb.Append(hash[i].ToString("X2"));
            }
            return sb.ToString();
        }

        public static byte[] MD5(byte[] data)
        {
            using var md5 = System.Security.Cryptography.MD5.Create();
            return md5.ComputeHash(data);
        }
    }
}