133 lines
3.9 KiB
C#
133 lines
3.9 KiB
C#
// (c) Copyright Ascensio System SIA 2010-2022
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//
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// This program is a free software product.
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// You can redistribute it and/or modify it under the terms
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// of the GNU Affero General Public License (AGPL) version 3 as published by the Free Software
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// Foundation. In accordance with Section 7(a) of the GNU AGPL its Section 15 shall be amended
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// to the effect that Ascensio System SIA expressly excludes the warranty of non-infringement of
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// any third-party rights.
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//
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// This program is distributed WITHOUT ANY WARRANTY, without even the implied warranty
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// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For details, see
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// the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
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//
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// You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia, EU, LV-1021.
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//
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// The interactive user interfaces in modified source and object code versions of the Program must
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// display Appropriate Legal Notices, as required under Section 5 of the GNU AGPL version 3.
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//
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// Pursuant to Section 7(b) of the License you must retain the original Product logo when
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// distributing the program. Pursuant to Section 7(e) we decline to grant you any rights under
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// trademark law for use of our trademarks.
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//
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// All the Product's GUI elements, including illustrations and icon sets, as well as technical writing
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// content are licensed under the terms of the Creative Commons Attribution-ShareAlike 4.0
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// International. See the License terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
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namespace ASC.Common.Security;
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public class AscRandom : Random
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{
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private const int Mbig = int.MaxValue;
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private const int Mseed = 161803398;
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private const int Mz = 0;
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private int _inext;
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private int _inextp;
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private readonly int[] _seeds;
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public AscRandom() : this(Environment.TickCount) { }
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public AscRandom(int seed)
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{
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_seeds = new int[56];
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var num4 = (seed == int.MinValue) ? int.MaxValue : Math.Abs(seed);
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var num2 = 161803398 - num4;
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_seeds[^1] = num2;
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var num3 = 1;
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for (var i = 1; i < _seeds.Length - 1; i++)
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{
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var index = 21 * i % (_seeds.Length - 1);
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_seeds[index] = num3;
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num3 = num2 - num3;
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if (num3 < 0)
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{
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num3 += int.MaxValue;
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}
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num2 = _seeds[index];
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}
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for (var j = 1; j < 5; j++)
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{
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for (var k = 1; k < _seeds.Length; k++)
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{
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_seeds[k] -= _seeds[1 + ((k + 30) % (_seeds.Length - 1))];
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if (_seeds[k] < 0)
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{
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_seeds[k] += int.MaxValue;
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}
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}
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}
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_inext = 0;
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_inextp = 21;
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}
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public override int Next(int maxValue)
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{
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if (maxValue < 0)
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{
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throw new ArgumentOutOfRangeException(nameof(maxValue));
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}
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return (int)(InternalSample() * 4.6566128752457969E-10 * maxValue);
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}
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public override void NextBytes(byte[] buffer)
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{
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ArgumentNullException.ThrowIfNull(buffer);
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for (var i = 0; i < buffer.Length; i++)
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{
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buffer[i] = (byte)(InternalSample() % (byte.MaxValue + 1));
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}
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}
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private int InternalSample()
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{
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var inext = _inext;
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var inextp = _inextp;
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if (++inext >= _seeds.Length - 1)
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{
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inext = 1;
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}
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if (++inextp >= _seeds.Length - 1)
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{
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inextp = 1;
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}
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var num = _seeds[inext] - _seeds[inextp];
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if (num == int.MaxValue)
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{
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num--;
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}
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if (num < 0)
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{
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num += int.MaxValue;
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}
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_seeds[inext] = num;
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_inext = inext;
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_inextp = inextp;
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return num;
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}
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} |