2019-05-15 14:56:09 +00:00
|
|
|
/*
|
|
|
|
*
|
|
|
|
* (c) Copyright Ascensio System Limited 2010-2018
|
|
|
|
*
|
|
|
|
* This program is freeware. You can redistribute it and/or modify it under the terms of the GNU
|
|
|
|
* General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html).
|
|
|
|
* In accordance with Section 7(a) of the GNU GPL 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 more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
|
|
|
|
*
|
|
|
|
* You can contact Ascensio System SIA by email at sales@onlyoffice.com
|
|
|
|
*
|
|
|
|
* The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display
|
|
|
|
* Appropriate Legal Notices, as required under Section 5 of the GNU GPL version 3.
|
|
|
|
*
|
|
|
|
* Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains
|
|
|
|
* relevant author attributions when distributing the software. If the display of the logo in its graphic
|
|
|
|
* form is not reasonably feasible for technical reasons, you must include the words "Powered by ONLYOFFICE"
|
|
|
|
* in every copy of the program you distribute.
|
|
|
|
* Pursuant to Section 7 § 3(e) we decline to grant you any rights under trademark law for use of our trademarks.
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
|
|
using System;
|
|
|
|
using System.IO;
|
|
|
|
using System.Security.Cryptography;
|
2019-08-15 12:04:42 +00:00
|
|
|
using System.Text;
|
2020-08-27 14:01:37 +00:00
|
|
|
|
2019-05-15 14:56:09 +00:00
|
|
|
using ASC.Common.Security;
|
|
|
|
|
|
|
|
namespace ASC.Core
|
|
|
|
{
|
|
|
|
public class Crypto
|
|
|
|
{
|
|
|
|
private static byte[] GetSK1(bool rewrite)
|
|
|
|
{
|
|
|
|
return GetSK(rewrite.GetType().Name.Length);
|
|
|
|
}
|
|
|
|
|
|
|
|
private static byte[] GetSK2(bool rewrite)
|
|
|
|
{
|
|
|
|
return GetSK(rewrite.GetType().Name.Length * 2);
|
|
|
|
}
|
|
|
|
|
|
|
|
private static byte[] GetSK(int seed)
|
|
|
|
{
|
|
|
|
var random = new AscRandom(seed);
|
|
|
|
var randomKey = new byte[32];
|
|
|
|
for (var i = 0; i < randomKey.Length; i++)
|
|
|
|
{
|
|
|
|
randomKey[i] = (byte)random.Next(byte.MaxValue);
|
|
|
|
}
|
|
|
|
return randomKey;
|
|
|
|
}
|
|
|
|
|
|
|
|
public static string GetV(string data, int keyno, bool reverse)
|
|
|
|
{
|
|
|
|
var hasher = Rijndael.Create();
|
|
|
|
hasher.Key = keyno == 1 ? GetSK1(false) : GetSK2(false);
|
|
|
|
hasher.IV = new byte[hasher.BlockSize >> 3];
|
|
|
|
|
|
|
|
string result;
|
|
|
|
if (reverse)
|
|
|
|
{
|
2019-08-15 15:08:40 +00:00
|
|
|
using var ms = new MemoryStream();
|
|
|
|
using var ss = new CryptoStream(ms, hasher.CreateEncryptor(), CryptoStreamMode.Write);
|
|
|
|
var buffer = Encoding.Unicode.GetBytes(data);
|
|
|
|
ss.Write(buffer, 0, buffer.Length);
|
|
|
|
ss.FlushFinalBlock();
|
|
|
|
hasher.Clear();
|
|
|
|
result = Convert.ToBase64String(ms.ToArray());
|
2019-05-15 14:56:09 +00:00
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
var bytes = Convert.FromBase64String(data);
|
2019-08-15 15:08:40 +00:00
|
|
|
using var ms = new MemoryStream(bytes);
|
|
|
|
using var ss = new CryptoStream(ms, hasher.CreateDecryptor(), CryptoStreamMode.Read);
|
|
|
|
var buffer = new byte[bytes.Length];
|
|
|
|
var size = ss.Read(buffer, 0, buffer.Length);
|
|
|
|
hasher.Clear();
|
|
|
|
var newBuffer = new byte[size];
|
|
|
|
Array.Copy(buffer, newBuffer, size);
|
|
|
|
result = Encoding.Unicode.GetString(newBuffer);
|
2019-05-15 14:56:09 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
return result;
|
|
|
|
}
|
|
|
|
|
|
|
|
internal static byte[] GetV(byte[] data, int keyno, bool reverse)
|
|
|
|
{
|
|
|
|
var hasher = Rijndael.Create();
|
|
|
|
hasher.Key = keyno == 1 ? GetSK1(false) : GetSK2(false);
|
|
|
|
hasher.IV = new byte[hasher.BlockSize >> 3];
|
|
|
|
|
|
|
|
byte[] result;
|
|
|
|
if (reverse)
|
|
|
|
{
|
2019-08-15 15:08:40 +00:00
|
|
|
using var ms = new MemoryStream();
|
|
|
|
using var ss = new CryptoStream(ms, hasher.CreateEncryptor(), CryptoStreamMode.Write);
|
|
|
|
var buffer = data;
|
|
|
|
ss.Write(buffer, 0, buffer.Length);
|
|
|
|
ss.FlushFinalBlock();
|
|
|
|
hasher.Clear();
|
|
|
|
result = ms.ToArray();
|
2019-05-15 14:56:09 +00:00
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
var bytes = data;
|
2019-08-15 15:08:40 +00:00
|
|
|
using var ms = new MemoryStream(bytes);
|
|
|
|
using var ss = new CryptoStream(ms, hasher.CreateDecryptor(), CryptoStreamMode.Read);
|
|
|
|
var buffer = new byte[bytes.Length];
|
|
|
|
var size = ss.Read(buffer, 0, buffer.Length);
|
|
|
|
hasher.Clear();
|
|
|
|
var newBuffer = new byte[size];
|
|
|
|
Array.Copy(buffer, newBuffer, size);
|
|
|
|
result = newBuffer;
|
2019-05-15 14:56:09 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
return result;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|