2019-05-17 11:58:09 +00:00
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/*
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*
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* (c) Copyright Ascensio System Limited 2010-2018
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*
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* This program is freeware. You can redistribute it and/or modify it under the terms of the GNU
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* General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html).
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* In accordance with Section 7(a) of the GNU GPL its Section 15 shall be amended to the effect that
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* Ascensio System SIA expressly excludes the warranty of non-infringement of any third-party rights.
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*
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* THIS PROGRAM IS DISTRIBUTED WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY OR
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* FITNESS FOR A PARTICULAR PURPOSE. For more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
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*
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* You can contact Ascensio System SIA by email at sales@onlyoffice.com
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*
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* The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display
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* Appropriate Legal Notices, as required under Section 5 of the GNU GPL version 3.
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*
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* Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains
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* relevant author attributions when distributing the software. If the display of the logo in its graphic
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* form is not reasonably feasible for technical reasons, you must include the words "Powered by ONLYOFFICE"
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* in every copy of the program you distribute.
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* Pursuant to Section 7 § 3(e) we decline to grant you any rights under trademark law for use of our trademarks.
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*
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*/
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namespace ASC.Security.Cryptography
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{
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2020-10-19 15:53:15 +00:00
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[Singletone]
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2019-10-09 15:04:46 +00:00
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public class InstanceCrypto
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2019-05-17 08:32:23 +00:00
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{
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2022-02-01 14:51:29 +00:00
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private readonly byte[] _eKey;
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2019-10-09 15:04:46 +00:00
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2022-02-01 14:51:29 +00:00
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public InstanceCrypto(MachinePseudoKeys machinePseudoKeys) =>
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_eKey = machinePseudoKeys.GetMachineConstant(32);
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2019-10-09 15:04:46 +00:00
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2022-02-01 14:51:29 +00:00
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public string Encrypt(string data) =>
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Convert.ToBase64String(Encrypt(Encoding.UTF8.GetBytes(data)));
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2019-05-17 11:58:09 +00:00
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2019-10-09 15:04:46 +00:00
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public byte[] Encrypt(byte[] data)
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2019-05-17 11:58:09 +00:00
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{
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2021-12-16 12:49:35 +00:00
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using var hasher = Aes.Create();
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2022-02-01 14:51:29 +00:00
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hasher.Key = _eKey;
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2019-05-17 11:58:09 +00:00
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hasher.IV = new byte[hasher.BlockSize >> 3];
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2021-11-24 19:34:39 +00:00
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2019-08-15 15:08:40 +00:00
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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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2021-11-24 19:34:39 +00:00
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using var plainTextStream = new MemoryStream(data);
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2022-02-01 14:51:29 +00:00
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2021-11-24 19:34:39 +00:00
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plainTextStream.CopyTo(ss);
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2021-11-26 10:53:06 +00:00
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ss.FlushFinalBlock();
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hasher.Clear();
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2022-02-01 14:51:29 +00:00
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2019-08-15 15:08:40 +00:00
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return ms.ToArray();
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2019-05-17 11:58:09 +00:00
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}
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2022-02-01 14:51:29 +00:00
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public string Decrypt(string data) => Decrypt(Convert.FromBase64String(data));
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2019-05-17 11:58:09 +00:00
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2021-08-25 15:26:13 +00:00
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public string Decrypt(byte[] data)
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2019-05-17 11:58:09 +00:00
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{
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2021-12-16 12:49:35 +00:00
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using var hasher = Aes.Create();
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2022-02-01 14:51:29 +00:00
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hasher.Key = _eKey;
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2019-05-17 11:58:09 +00:00
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hasher.IV = new byte[hasher.BlockSize >> 3];
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2021-12-16 12:49:35 +00:00
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using var msDecrypt = new MemoryStream(data);
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using var csDecrypt = new CryptoStream(msDecrypt, hasher.CreateDecryptor(), CryptoStreamMode.Read);
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using var srDecrypt = new StreamReader(csDecrypt);
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2021-08-25 15:26:13 +00:00
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2021-12-16 12:49:35 +00:00
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// Read the decrypted bytes from the decrypting stream
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// and place them in a string.
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return srDecrypt.ReadToEnd();
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2019-05-17 11:58:09 +00:00
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}
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}
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2019-05-15 14:56:09 +00:00
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}
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