// (c) Copyright Ascensio System SIA 2010-2022
//
// This program is a free software product.
// You can redistribute it and/or modify it under the terms
// of the GNU Affero General Public License (AGPL) version 3 as published by the Free Software
// Foundation. In accordance with Section 7(a) of the GNU AGPL 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 details, see
// the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
//
// You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia, EU, LV-1021.
//
// The  interactive user interfaces in modified source and object code versions of the Program must
// display Appropriate Legal Notices, as required under Section 5 of the GNU AGPL version 3.
//
// Pursuant to Section 7(b) of the License you must retain the original Product logo when
// distributing the program. Pursuant to Section 7(e) we decline to grant you any rights under
// trademark law for use of our trademarks.
//
// All the Product's GUI elements, including illustrations and icon sets, as well as technical writing
// content are licensed under the terms of the Creative Commons Attribution-ShareAlike 4.0
// International. See the License terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode

namespace ASC.FederatedLogin.Helpers;

public static class HashHelper
{
    public static int CombineHashCodes(int hash1, int hash2)
    {
        return hash2 == 0 ? hash1 : ((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);
    }
}