111 lines
4.2 KiB
C#
111 lines
4.2 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.Core;
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public static class Crypto
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{
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private static byte[] GetSK1(bool rewrite)
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{
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return GetSK(rewrite.GetType().Name.Length);
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}
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private static byte[] GetSK2(bool rewrite)
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{
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return GetSK(rewrite.GetType().Name.Length * 2);
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}
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private static byte[] GetSK(int seed)
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{
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var random = new AscRandom(seed);
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var randomKey = new byte[32];
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for (var i = 0; i < randomKey.Length; i++)
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{
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randomKey[i] = (byte)random.Next(byte.MaxValue);
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}
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return randomKey;
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}
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public static string GetV(string data, int keyno, bool reverse)
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{
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var hasher = Aes.Create();
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hasher.Key = keyno == 1 ? GetSK1(false) : GetSK2(false);
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hasher.IV = new byte[hasher.BlockSize >> 3];
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if (reverse)
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{
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using var ms = new MemoryStream();
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using var ss = new CryptoStream(ms, hasher.CreateEncryptor(), CryptoStreamMode.Write);
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using var plainTextStream = new MemoryStream(Encoding.Unicode.GetBytes(data));
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plainTextStream.CopyTo(ss);
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ss.FlushFinalBlock();
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hasher.Clear();
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return Convert.ToBase64String(ms.ToArray());
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}
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else
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{
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using var ms = new MemoryStream(Convert.FromBase64String(data));
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using var ss = new CryptoStream(ms, hasher.CreateDecryptor(), CryptoStreamMode.Read);
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using var plainTextStream = new MemoryStream();
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ss.CopyTo(plainTextStream);
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hasher.Clear();
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return Encoding.Unicode.GetString(plainTextStream.ToArray());
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}
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}
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internal static byte[] GetV(byte[] data, int keyno, bool reverse)
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{
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var hasher = Aes.Create();
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hasher.Key = keyno == 1 ? GetSK1(false) : GetSK2(false);
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hasher.IV = new byte[hasher.BlockSize >> 3];
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if (reverse)
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{
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using var ms = new MemoryStream();
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using var ss = new CryptoStream(ms, hasher.CreateEncryptor(), CryptoStreamMode.Write);
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using var plainTextStream = new MemoryStream(data);
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plainTextStream.CopyTo(ss);
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ss.FlushFinalBlock();
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hasher.Clear();
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return ms.ToArray();
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}
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else
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{
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using var ms = new MemoryStream(data);
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using var ss = new CryptoStream(ms, hasher.CreateDecryptor(), CryptoStreamMode.Read);
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using var plainTextStream = new MemoryStream();
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ss.CopyTo(plainTextStream);
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hasher.Clear();
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return plainTextStream.ToArray();
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}
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}
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}
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