95 lines
3.5 KiB
C#
95 lines
3.5 KiB
C#
/*
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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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using System;
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using System.IO;
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using System.Security.Cryptography;
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using System.Text;
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using ASC.Common;
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namespace ASC.Security.Cryptography
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{
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[Singletone]
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public class InstanceCrypto
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{
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private MachinePseudoKeys MachinePseudoKeys { get; }
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public InstanceCrypto(MachinePseudoKeys machinePseudoKeys)
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{
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MachinePseudoKeys = machinePseudoKeys;
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}
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public string Encrypt(string data)
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{
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return Convert.ToBase64String(Encrypt(Encoding.UTF8.GetBytes(data)));
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}
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public byte[] Encrypt(byte[] data)
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{
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var hasher = Aes.Create();
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hasher.Key = EKey();
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hasher.IV = new byte[hasher.BlockSize >> 3];
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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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ss.Write(data, 0, data.Length);
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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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public string Decrypt(string data)
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{
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return Decrypt(Convert.FromBase64String(data));
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}
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public string Decrypt(byte[] data)
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{
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var hasher = Aes.Create();
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hasher.Key = EKey();
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hasher.IV = new byte[hasher.BlockSize >> 3];
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using (MemoryStream msDecrypt = new MemoryStream(data))
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{
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using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, hasher.CreateDecryptor(), CryptoStreamMode.Read))
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{
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using (StreamReader srDecrypt = new StreamReader(csDecrypt))
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{
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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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}
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}
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}
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}
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private byte[] EKey()
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{
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return MachinePseudoKeys.GetMachineConstant(32);
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}
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}
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} |