// Decompiled with JetBrains decompiler
// Type: Rei.Fs.EncryptFs
// Assembly: Rei.Fs, Version=1.13.2.8796, Culture=neutral, PublicKeyToken=null
// MVID: D8B08A8B-697C-4439-9CFF-1BE4EE46F7B0
// Assembly location: F:\Eigene Dateien\Dropbox\portable Collection\Progs\CarotDAV\Rei.Fs.dll

using Microsoft.VisualBasic.CompilerServices;
using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using System.Security.Cryptography;
using System.Text;

namespace Rei.Fs
{
  public class EncryptFs : FsBase
  {
    private static string pVersionName = "1";
    private static byte[] pSalt;
    private static string pName;
    private FsBase basefs;
    private string EscapeString;
    private string EncryptKey;
    private bool HideUnencryptedFile;
    private bool HideUnencryptedDirectory;
    private Rijndael crypto_none;
    private Rijndael crypto_zero;
    private const string FormatName = "CarotDAV Encryption 1.0 ";

    static EncryptFs()
    {
      Assembly executingAssembly = Assembly.GetExecutingAssembly();
      EncryptFs.pName = ((AssemblyProductAttribute) executingAssembly.GetCustomAttributes(typeof (AssemblyProductAttribute), false)[0]).Product + executingAssembly.GetName().Version.ToString(3);
    }

    public EncryptFs(FsBase @base, string key, string escape, bool hidefile, bool hidedir)
      : base(@base.ConnectionSetting)
    {
      this.basefs = @base;
      this.EncryptKey = key;
      this.EscapeString = escape;
      this.HideUnencryptedFile = hidefile;
      this.HideUnencryptedDirectory = hidedir;
      this.crypto_none = Rijndael.Create();
      this.crypto_none.Mode = CipherMode.CBC;
      this.crypto_none.Padding = PaddingMode.None;
      this.crypto_none.BlockSize = 128;
      this.crypto_none.KeySize = 256;
      this.crypto_zero = Rijndael.Create();
      this.crypto_zero.Mode = CipherMode.CBC;
      this.crypto_zero.Padding = PaddingMode.Zeros;
      this.crypto_zero.BlockSize = 128;
      this.crypto_zero.KeySize = 256;
      Rfc2898DeriveBytes rfc2898DeriveBytes = new Rfc2898DeriveBytes(this.EncryptKey, Encoding.UTF8.GetBytes("CarotDAV Encryption 1.0 "), 1024);
      this.crypto_none.Key = rfc2898DeriveBytes.GetBytes(checked ((int) Math.Round(unchecked ((double) this.crypto_none.KeySize / 8.0))));
      this.crypto_none.IV = rfc2898DeriveBytes.GetBytes(checked ((int) Math.Round(unchecked ((double) this.crypto_none.BlockSize / 8.0))));
      this.crypto_zero.Key = this.crypto_none.Key;
      this.crypto_zero.IV = this.crypto_none.IV;
      this.basefs.LogMessage += new EventHandler<LogMessageEventArgs>(this.InnerOnLogMessage);
    }

    private void InnerOnLogMessage(object sender, LogMessageEventArgs e)
    {
      this.OnLogMessage(e.Message);
    }

    public override SecureType LastSecureType
    {
      get
      {
        return this.basefs.LastSecureType;
      }
    }

    public override string ClientName
    {
      get
      {
        return this.basefs.ClientName;
      }
      set
      {
        this.basefs.ClientName = value;
      }
    }

    public override string GroupName
    {
      get
      {
        return this.basefs.GroupName;
      }
      set
      {
        this.basefs.GroupName = value;
      }
    }

    public override string UserName
    {
      get
      {
        return this.basefs.UserName;
      }
    }

    public override string Password
    {
      get
      {
        return this.basefs.Password;
      }
    }

    public override FsAbility Ability
    {
      get
      {
        return this.basefs.Ability & ~(FsAbility.PartialRead | FsAbility.PartialWrite);
      }
    }

    public override void ResetConnection()
    {
      this.basefs.ResetConnection();
      base.ResetConnection();
    }

    public override ResourceInfo GetInfo(Uri targeturi)
    {
      string[] segments1 = this.BaseUri.Segments;
      string[] segments2 = targeturi.Segments;
      List<ResourceInfo> resourceInfoList = new List<ResourceInfo>();
      Uri uri1 = new Uri(this.BaseUri.GetComponents(UriComponents.SchemeAndServer, UriFormat.UriEscaped) + "/");
      Uri uri2 = uri1;
      bool encrypted = false;
      int index1 = 1;
      while (index1 < segments1.Length && index1 < segments2.Length && UriUtil.IsSameSegmentString(segments1[index1], segments2[index1]))
      {
        uri2 = UriUtil.CombineSegment(uri2, segments2[index1]);
        uri1 = UriUtil.CombineSegment(uri1, segments2[index1]);
        encrypted = false;
        checked { ++index1; }
      }
      int index2 = index1;
      while (index1 < segments2.Length)
      {
        string name = Uri.UnescapeDataString(segments2[index1]).Replace("/", "");
        uri2 = UriUtil.CombineName(uri2, this.EncryptName(name));
        encrypted = true;
        checked { ++index1; }
      }
      try
      {
        ResourceInfo info = this.basefs.GetInfo(uri2);
        this.CreateInfo2(targeturi, info, encrypted);
        return info;
      }
      catch (RemoteResourceNotFoundException ex)
      {
        ProjectData.SetProjectError((Exception) ex);
        ProjectData.ClearProjectError();
      }
      catch (Exception ex)
      {
        ProjectData.SetProjectError(ex);
        throw;
      }
      if (this.HideUnencryptedDirectory)
        throw new RemoteResourceNotFoundException(targeturi);
      ResourceInfo[] infoAndEntries = this.basefs.GetInfoAndEntries(uri1);
      this.CreateInfo2(uri1, infoAndEntries[0], false);
      int num1 = 1;
      int num2 = checked (infoAndEntries.Length - 1);
      int index3 = num1;
      while (index3 <= num2)
      {
        if (this.CreateInfo(infoAndEntries[0].Id.Uri, infoAndEntries[index3]))
          resourceInfoList.Add(infoAndEntries[index3]);
        checked { ++index3; }
      }
label_16:
      string Right = Uri.UnescapeDataString(segments2[index2]);
      int num3 = 0;
      int num4 = checked (resourceInfoList.Count - 1);
      int index4 = num3;
      while (index4 <= num4)
      {
        string lastName = UriUtil.GetLastName(resourceInfoList[index4].Id.Uri);
        if (Operators.CompareString(lastName, Right, false) == 0 || Operators.CompareString(lastName + "/", Right, false) == 0 || Operators.CompareString(lastName, Right + "/", false) == 0)
        {
          checked { ++index2; }
          ResourceInfo resourceInfo = resourceInfoList[index4];
          if (index2 == segments2.Length)
            return resourceInfo;
          if (!resourceInfo.IsCollection)
            throw new RemoteResourceNotFoundException(targeturi);
          resourceInfoList.Clear();
          resourceInfoList.AddRange((IEnumerable<ResourceInfo>) this.GetEntries(resourceInfo.Id));
          Uri.UnescapeDataString(segments2[index2]);
          goto label_16;
        }
        else
          checked { ++index4; }
      }
      throw new RemoteResourceNotFoundException(targeturi);
    }

    public override ResourceInfo GetInfo(ResourceId id)
    {
      EncryptFs.EncryptId encryptId = (EncryptFs.EncryptId) id;
      ResourceInfo info = this.basefs.GetInfo(encryptId.BaseId);
      if (this.CreateInfo(UriUtil.GetParent(encryptId.Uri), info))
        return info;
      throw new RemoteResourceNotFoundException(id.Uri);
    }

    public override ResourceInfo GetInfo(ResourceId parentid, string name)
    {
      EncryptFs.EncryptId encryptId = (EncryptFs.EncryptId) parentid;
      string name1 = this.EncryptName(name);
      try
      {
        ResourceInfo info = this.basefs.GetInfo(encryptId.BaseId, name1);
        if (this.CreateInfo(encryptId.Uri, info))
          return info;
      }
      catch (RemoteResourceNotFoundException ex)
      {
        ProjectData.SetProjectError((Exception) ex);
        ProjectData.ClearProjectError();
      }
      catch (Exception ex)
      {
        ProjectData.SetProjectError(ex);
        throw;
      }
      ResourceInfo info1 = this.basefs.GetInfo(encryptId.BaseId, name);
      this.CreateInfo2(UriUtil.CombineName(encryptId.Uri, name), info1, false);
      return info1;
    }

    public override ResourceInfo GetParentInfo(ResourceId id)
    {
      EncryptFs.EncryptId encryptId = (EncryptFs.EncryptId) id;
      ResourceInfo parentInfo = this.basefs.GetParentInfo(encryptId.BaseId);
      if (this.CreateInfo(UriUtil.GetParent(UriUtil.GetParent(encryptId.Uri)), parentInfo))
        return parentInfo;
      throw new RemoteResourceNotFoundException(id.Uri);
    }

    public override ResourceInfo[] GetEntries(ResourceId id)
    {
      EncryptFs.EncryptId encryptId = (EncryptFs.EncryptId) id;
      ResourceInfo[] entries = this.basefs.GetEntries(encryptId.BaseId);
      List<ResourceInfo> resourceInfoList = new List<ResourceInfo>();
      int num1 = 0;
      int num2 = checked (entries.Length - 1);
      int index = num1;
      while (index <= num2)
      {
        if (this.CreateInfo(encryptId.Uri, entries[index]))
          resourceInfoList.Add(entries[index]);
        checked { ++index; }
      }
      return resourceInfoList.ToArray();
    }

    public override ResourceInfo[] GetInfoAndEntries(Uri targeturi)
    {
      string[] segments1 = this.BaseUri.Segments;
      string[] segments2 = targeturi.Segments;
      List<ResourceInfo> resourceInfoList = new List<ResourceInfo>();
      Uri uri1 = new Uri(this.BaseUri.GetComponents(UriComponents.SchemeAndServer, UriFormat.UriEscaped) + "/");
      Uri uri2 = uri1;
      bool encrypted = false;
      int index1 = 1;
      while (index1 < segments1.Length && index1 < segments2.Length && UriUtil.IsSameSegmentString(segments1[index1], segments2[index1]))
      {
        uri2 = UriUtil.CombineSegment(uri2, segments2[index1]);
        uri1 = UriUtil.CombineSegment(uri1, segments2[index1]);
        encrypted = false;
        checked { ++index1; }
      }
      int index2 = index1;
      while (index1 < segments2.Length)
      {
        string name = Uri.UnescapeDataString(segments2[index1]).Replace("/", "");
        uri2 = UriUtil.CombineName(uri2, this.EncryptName(name));
        encrypted = true;
        checked { ++index1; }
      }
      try
      {
        ResourceInfo[] infoAndEntries = this.basefs.GetInfoAndEntries(uri2);
        this.CreateInfo2(targeturi, infoAndEntries[0], encrypted);
        resourceInfoList.Add(infoAndEntries[0]);
        int num1 = 1;
        int num2 = checked (infoAndEntries.Length - 1);
        int index3 = num1;
        while (index3 <= num2)
        {
          if (this.CreateInfo(infoAndEntries[0].Id.Uri, infoAndEntries[index3]))
            resourceInfoList.Add(infoAndEntries[index3]);
          checked { ++index3; }
        }
        return resourceInfoList.ToArray();
      }
      catch (RemoteResourceNotFoundException ex)
      {
        ProjectData.SetProjectError((Exception) ex);
        ProjectData.ClearProjectError();
      }
      if (this.HideUnencryptedDirectory)
        throw new RemoteResourceNotFoundException(targeturi);
      ResourceInfo[] infoAndEntries1 = this.basefs.GetInfoAndEntries(uri1);
      this.CreateInfo2(uri1, infoAndEntries1[0], false);
      int num3 = 1;
      int num4 = checked (infoAndEntries1.Length - 1);
      int index4 = num3;
      while (index4 <= num4)
      {
        if (this.CreateInfo(infoAndEntries1[0].Id.Uri, infoAndEntries1[index4]))
          resourceInfoList.Add(infoAndEntries1[index4]);
        checked { ++index4; }
      }
label_20:
      string Right = Uri.UnescapeDataString(segments2[index2]);
      int num5 = 0;
      int num6 = checked (resourceInfoList.Count - 1);
      int index5 = num5;
      while (index5 <= num6)
      {
        string lastName = UriUtil.GetLastName(resourceInfoList[index5].Id.Uri);
        if (Operators.CompareString(lastName, Right, false) == 0 || Operators.CompareString(lastName + "/", Right, false) == 0 || Operators.CompareString(lastName, Right + "/", false) == 0)
        {
          checked { ++index2; }
          ResourceInfo resourceInfo = resourceInfoList[index5];
          if (index2 != segments2.Length)
          {
            if (!resourceInfo.IsCollection)
              throw new RemoteResourceNotFoundException(targeturi);
            resourceInfoList.Clear();
            resourceInfoList.AddRange((IEnumerable<ResourceInfo>) this.GetEntries(resourceInfo.Id));
            Uri.UnescapeDataString(segments2[index2]);
            goto label_20;
          }
          else
          {
            if (resourceInfo.IsCollection)
            {
              resourceInfoList.Clear();
              resourceInfoList.Add(resourceInfo);
              resourceInfoList.AddRange((IEnumerable<ResourceInfo>) this.GetEntries(resourceInfo.Id));
              return resourceInfoList.ToArray();
            }
            return new ResourceInfo[1]{ resourceInfo };
          }
        }
        else
          checked { ++index5; }
      }
      throw new RemoteResourceNotFoundException(targeturi);
    }

    public override ResourceInfo[] GetInfoAndEntries(ResourceId id)
    {
      EncryptFs.EncryptId encryptId = (EncryptFs.EncryptId) id;
      ResourceInfo[] infoAndEntries = this.basefs.GetInfoAndEntries(encryptId.BaseId);
      if (!this.CreateInfo(UriUtil.GetParent(encryptId.Uri), infoAndEntries[0]))
        throw new RemoteResourceNotFoundException(encryptId.Uri);
      List<ResourceInfo> resourceInfoList = new List<ResourceInfo>();
      resourceInfoList.Add(infoAndEntries[0]);
      int num1 = 1;
      int num2 = checked (infoAndEntries.Length - 1);
      int index = num1;
      while (index <= num2)
      {
        if (this.CreateInfo(infoAndEntries[0].Id.Uri, infoAndEntries[index]))
          resourceInfoList.Add(infoAndEntries[index]);
        checked { ++index; }
      }
      return resourceInfoList.ToArray();
    }

    public override ResourceInfo[] GetParentInfoAndEntries(ResourceId childid)
    {
      EncryptFs.EncryptId encryptId = (EncryptFs.EncryptId) childid;
      ResourceInfo[] parentInfoAndEntries = this.basefs.GetParentInfoAndEntries(encryptId.BaseId);
      Uri parent = UriUtil.GetParent(encryptId.Uri);
      if (!this.CreateInfo(UriUtil.GetParent(parent), parentInfoAndEntries[0]))
        throw new RemoteResourceNotFoundException(parent);
      List<ResourceInfo> resourceInfoList = new List<ResourceInfo>();
      resourceInfoList.Add(parentInfoAndEntries[0]);
      int num1 = 1;
      int num2 = checked (parentInfoAndEntries.Length - 1);
      int index = num1;
      while (index <= num2)
      {
        if (this.CreateInfo(parentInfoAndEntries[0].Id.Uri, parentInfoAndEntries[index]))
          resourceInfoList.Add(parentInfoAndEntries[index]);
        checked { ++index; }
      }
      return resourceInfoList.ToArray();
    }

    public override ReturnedInfo CreateCollection(ResourceId parentid, string name)
    {
      EncryptFs.EncryptId encryptId = (EncryptFs.EncryptId) parentid;
      string name1 = this.EncryptName(name);
      ReturnedInfo collection = this.basefs.CreateCollection(encryptId.BaseId, name1);
      ResourceId baseid = !(collection is ResourceInfo) ? (ResourceId) collection : ((ResourceInfo) collection).Id;
      return (ReturnedInfo) new EncryptFs.EncryptId(UriUtil.AddLastSlash(UriUtil.CombineName(encryptId.Uri, name)), baseid, true, this);
    }

    public override void Delete(ResourceId id)
    {
      EncryptFs.EncryptId encryptId = (EncryptFs.EncryptId) id;
      if (!encryptId.Encrypted && (!encryptId.IsCollection || this.HideUnencryptedDirectory) && (encryptId.IsCollection || this.HideUnencryptedFile))
        throw new Exception();
      this.basefs.Delete(encryptId.BaseId);
    }

    public override ReturnedInfo Move(ResourceId id, ResourceId newparentid, string newname, bool overwrite)
    {
      EncryptFs.EncryptId encryptId = (EncryptFs.EncryptId) id;
      ReturnedInfo returnedInfo;
      Uri target;
      if (newname == null)
      {
        ResourceId baseId = ((EncryptFs.EncryptId) newparentid).BaseId;
        returnedInfo = this.basefs.Move(encryptId.BaseId, baseId, (string) null, overwrite);
        target = UriUtil.CombineName(newparentid.Uri, UriUtil.GetLastName(encryptId.Uri));
      }
      else if ((object) newparentid == null)
      {
        string newname1 = !encryptId.Encrypted ? newname : this.EncryptName(newname);
        returnedInfo = this.basefs.Move(encryptId.BaseId, (ResourceId) null, newname1, overwrite);
        target = UriUtil.CombineName(UriUtil.GetParent(encryptId.Uri), newname);
      }
      else
      {
        ResourceId baseId = ((EncryptFs.EncryptId) newparentid).BaseId;
        string newname1 = !encryptId.Encrypted ? newname : this.EncryptName(newname);
        returnedInfo = this.basefs.Move(encryptId.BaseId, baseId, newname1, overwrite);
        target = UriUtil.CombineName(newparentid.Uri, newname);
      }
      ResourceId baseid = !(returnedInfo is ResourceInfo) ? (ResourceId) returnedInfo : ((ResourceInfo) returnedInfo).Id;
      if (encryptId.IsCollection)
        target = UriUtil.AddLastSlash(target);
      return (ReturnedInfo) new EncryptFs.EncryptId(target, baseid, encryptId.Encrypted, this);
    }

    public override ReturnedInfo Copy(ResourceId id, ResourceId newparentid, string newname, bool overwrite)
    {
      EncryptFs.EncryptId encryptId = (EncryptFs.EncryptId) id;
      ReturnedInfo returnedInfo;
      Uri target;
      if (newname == null)
      {
        ResourceId baseId = ((EncryptFs.EncryptId) newparentid).BaseId;
        returnedInfo = this.basefs.Copy(encryptId.BaseId, baseId, (string) null, overwrite);
        target = UriUtil.CombineName(newparentid.Uri, UriUtil.GetLastName(encryptId.Uri));
      }
      else if ((object) newparentid == null)
      {
        string newname1 = !encryptId.Encrypted ? newname : this.EncryptName(newname);
        returnedInfo = this.basefs.Copy(encryptId.BaseId, (ResourceId) null, newname1, overwrite);
        target = UriUtil.CombineName(UriUtil.GetParent(encryptId.Uri), newname);
      }
      else
      {
        ResourceId baseId = ((EncryptFs.EncryptId) newparentid).BaseId;
        string newname1 = !encryptId.Encrypted ? newname : this.EncryptName(newname);
        returnedInfo = this.basefs.Copy(encryptId.BaseId, baseId, newname1, overwrite);
        target = UriUtil.CombineName(newparentid.Uri, newname);
      }
      ResourceId baseid = !(returnedInfo is ResourceInfo) ? (ResourceId) returnedInfo : ((ResourceInfo) returnedInfo).Id;
      if (encryptId.IsCollection)
        target = UriUtil.AddLastSlash(target);
      return (ReturnedInfo) new EncryptFs.EncryptId(target, baseid, encryptId.Encrypted, this);
    }

    public override ReturnedInfo SetResourceInfo(ResourceInfo info, ResourceInfo original)
    {
      EncryptFs.EncryptId id = (EncryptFs.EncryptId) info.Id;
      ResourceInfo info1 = (ResourceInfo) info.Clone();
      ResourceInfo original1 = (ResourceInfo) original.Clone();
      info1.Id = ((EncryptFs.EncryptId) info.Id).BaseId;
      original1.Id = info1.Id;
      if (id.Encrypted || id.IsCollection && !this.HideUnencryptedDirectory || !id.IsCollection && !this.HideUnencryptedFile)
        return this.basefs.SetResourceInfo(info1, original1);
      throw new Exception();
    }

    public override ReturnedInfo SetTimes(ResourceId id, DateTime lastmodifiedtime, DateTime creationtime, DateTime lastaccesstime)
    {
      EncryptFs.EncryptId encryptId = id as EncryptFs.EncryptId;
      if (encryptId.Encrypted || encryptId.IsCollection && !this.HideUnencryptedDirectory || !encryptId.IsCollection && !this.HideUnencryptedFile)
        return this.basefs.SetTimes(encryptId.BaseId, lastmodifiedtime, creationtime, lastaccesstime);
      throw new Exception();
    }

    public override Stream OpenRead(ResourceId id, ref long start, ref long length)
    {
      EncryptFs.EncryptId encryptId = (EncryptFs.EncryptId) id;
      if (start < 0L)
        throw new ArgumentOutOfRangeException(nameof (start));
      if (length == 0L)
        throw new ArgumentOutOfRangeException(nameof (length));
      if (encryptId.Encrypted)
      {
        FsBase basefs = this.basefs;
        ResourceId baseId = encryptId.BaseId;
        long start1 = 0;
        long length1 = -1;
        Stream basestream = basefs.OpenRead(baseId, ref start1, ref length1);
        start = 0L;
        length = -1L;
        return (Stream) new EncryptFs.CarotCryptStream(this, (ResourceId) encryptId, basestream, this.crypto_none.CreateDecryptor(), length);
      }
      if (encryptId.IsCollection && !this.HideUnencryptedDirectory || !encryptId.IsCollection && !this.HideUnencryptedFile)
        return this.basefs.OpenRead(encryptId.BaseId, ref start, ref length);
      throw new Exception();
    }

    public override Stream OpenWrite(ResourceId parentid, string name, long length)
    {
      EncryptFs.EncryptId encryptId = (EncryptFs.EncryptId) parentid;
      string name1 = this.EncryptName(name);
      Stream basestream = length < 0L ? this.basefs.OpenWrite(encryptId.BaseId, name1, -1L) : this.basefs.OpenWrite(encryptId.BaseId, name1, checked (length + 144L));
      return (Stream) new EncryptFs.CarotCryptStream(this, UriUtil.CombineName(encryptId.Uri, name), basestream, this.crypto_zero.CreateEncryptor(), length);
    }

    public override Stream OpenWriteOver(ResourceId id, long length)
    {
      EncryptFs.EncryptId encryptId = (EncryptFs.EncryptId) id;
      Stream basestream = length < 0L ? this.basefs.OpenWriteOver(encryptId.BaseId, -1L) : this.basefs.OpenWriteOver(encryptId.BaseId, checked (length + 144L));
      return (Stream) new EncryptFs.CarotCryptStream(this, encryptId.Uri, basestream, this.crypto_zero.CreateEncryptor(), length);
    }

    public override Stream OpenWriteResume(ResourceId id, ref long start, ref long length)
    {
      throw new NotSupportedException();
    }

    public override ReturnedInfo CloseWrite(Stream st)
    {
      st.Close();
      return ((EncryptFs.CarotCryptStream) st).ReturnedInfo;
    }

    public override string GetLock(ResourceId id, string owner, int timeoutseconds, FsBase.LockScope scope)
    {
      return this.basefs.GetLock(((EncryptFs.EncryptId) id).BaseId, owner, timeoutseconds, scope);
    }

    public override void ReleaseLock(ResourceId id, string locktoken)
    {
      this.basefs.ReleaseLock(id, locktoken);
    }

    private string EncryptName(string name)
    {
      byte[] numArray;
      using (ICryptoTransform encryptor = this.crypto_none.CreateEncryptor())
      {
        byte[] bytes = Encoding.UTF8.GetBytes(name);
        byte[] inputBuffer = new byte[16];
        if (bytes.Length <= 16)
        {
          numArray = new byte[16];
          Array.Copy((Array) bytes, (Array) inputBuffer, bytes.Length);
          encryptor.TransformBlock(inputBuffer, 0, 16, numArray, 0);
        }
        else
        {
          numArray = new byte[checked (bytes.Length - 1 + 1)];
          int num1 = 0;
          int num2 = checked (bytes.Length - 1 - 32);
          int num3 = num1;
          while (num3 <= num2)
          {
            encryptor.TransformBlock(bytes, num3, 16, numArray, num3);
            checked { num3 += 16; }
          }
          encryptor.TransformBlock(bytes, num3, 16, numArray, num3);
          Array.Copy((Array) numArray, num3, (Array) numArray, checked (num3 + 16), checked (bytes.Length - num3 + 16));
          Array.Copy((Array) bytes, checked (num3 + 16), (Array) inputBuffer, 0, checked (bytes.Length - num3 + 16));
          encryptor.TransformBlock(inputBuffer, 0, 16, numArray, num3);
        }
      }
      return this.EscapeString + Convert.ToBase64String(numArray).Replace('/', '-').Replace('+', '_').Replace("=", "");
    }

    private bool TryDecryptName(string name, ref string decrypted)
    {
      if (!name.StartsWith(this.EscapeString))
        return false;
      name = name.Substring(this.EscapeString.Length).Replace("-", "/").Replace('_', '+').Replace(" ", "");
      if (name.Length % 4 != 0)
        name += new string('=', checked (4 - unchecked (name.Length % 4)));
      byte[] inputBuffer;
      bool flag;
      try
      {
        inputBuffer = Convert.FromBase64String(name);
      }
      catch (Exception ex)
      {
        ProjectData.SetProjectError(ex);
        flag = false;
        ProjectData.ClearProjectError();
        goto label_22;
      }
      byte[] numArray1 = new byte[checked (inputBuffer.Length - 1 + 1)];
      using (ICryptoTransform decryptor1 = this.crypto_none.CreateDecryptor())
      {
        byte[] numArray2 = new byte[16];
        byte[] outputBuffer = new byte[16];
        if (inputBuffer.Length <= 16)
        {
          numArray1 = new byte[16];
          Array.Copy((Array) inputBuffer, (Array) numArray2, inputBuffer.Length);
          decryptor1.TransformBlock(numArray2, 0, 16, numArray1, 0);
        }
        else
        {
          int num1 = 0;
          int num2 = checked (inputBuffer.Length - 1 - 32);
          int num3 = num1;
          while (num3 <= num2)
          {
            decryptor1.TransformBlock(inputBuffer, num3, 16, numArray1, num3);
            checked { num3 += 16; }
          }
          Array.Copy((Array) inputBuffer, checked (num3 + 16), (Array) numArray2, 0, checked (inputBuffer.Length - num3 + 16));
          using (ICryptoTransform decryptor2 = this.crypto_none.CreateDecryptor(this.crypto_none.Key, numArray2))
            decryptor2.TransformBlock(inputBuffer, num3, 16, outputBuffer, 0);
          Array.Copy((Array) outputBuffer, checked (inputBuffer.Length - num3 + 16), (Array) numArray2, checked (inputBuffer.Length - num3 + 16), checked (num3 + 32 - inputBuffer.Length));
          decryptor1.TransformBlock(numArray2, 0, 16, numArray1, num3);
          Array.Copy((Array) outputBuffer, 0, (Array) numArray1, checked (num3 + 16), checked (inputBuffer.Length - num3 + 16));
        }
      }
      decrypted = Encoding.UTF8.GetString(numArray1).Replace("\0", "");
      return true;
label_22:
      return flag;
    }

    private bool CreateInfo(Uri parenturi, ResourceInfo ri)
    {
      string decrypted = (string) null;
      if (this.TryDecryptName(UriUtil.GetLastName(ri.Id.Uri), ref decrypted))
      {
        Uri target = UriUtil.CombineName(parenturi, decrypted);
        if (ri.IsCollection)
          target = UriUtil.AddLastSlash(target);
        else if (ri.Size < 144L)
        {
          ri.Size = 0L;
          ri.StatusDescription = "Invalid Encrypted File (too small)";
          ri.HasError = true;
        }
        else
          ri.Size = checked (ri.Size - 144L);
        ri.IsEncrypted = true;
        ri.Id = (ResourceId) new EncryptFs.EncryptId(target, ri.Id, true, this);
        return true;
      }
      if (!ri.IsCollection && this.HideUnencryptedFile)
        return false;
      if (ri.IsCollection && this.HideUnencryptedDirectory)
      {
        Uri uri = UriUtil.CombineName(parenturi, UriUtil.GetLastName(ri.Id.Uri));
        if (uri.Segments.Length > this.BaseUri.Segments.Length)
          return false;
        int num1 = 1;
        int num2 = checked (uri.Segments.Length - 1);
        int index = num1;
        while (index <= num2)
        {
          if (!UriUtil.IsSameSegmentString(this.BaseUri.Segments[index], uri.Segments[index]))
            return false;
          checked { ++index; }
        }
      }
      Uri target1 = UriUtil.CombineName(parenturi, UriUtil.GetLastName(ri.Id.Uri));
      if (ri.IsCollection)
        target1 = UriUtil.AddLastSlash(target1);
      ri.IsEncrypted = false;
      ri.Id = (ResourceId) new EncryptFs.EncryptId(target1, ri.Id, false, this);
      return true;
    }

    protected void CreateInfo2(Uri target, ResourceInfo ri, bool encrypted)
    {
      if (ri.IsCollection)
      {
        target = UriUtil.AddLastSlash(target);
      }
      else
      {
        target = UriUtil.RemoveLastSlash(target);
        if (encrypted)
        {
          if (ri.Size < 144L)
          {
            ri.Size = 0L;
            ri.StatusDescription = "Invalid Encrypted File (too small)";
            ri.HasError = true;
          }
          else
            ri.Size = checked (ri.Size - 144L);
        }
      }
      ri.IsEncrypted = encrypted;
      ri.Id = (ResourceId) new EncryptFs.EncryptId(target, ri.Id, encrypted, this);
    }

    private class CarotCryptStream : Stream
    {
      private EncryptFs pFs;
      private ReturnedInfo pReturnedInfo;
      private Uri pUri;
      private Stream pStream;
      private ICryptoTransform pTransform;
      private CryptoStreamMode pMode;
      private SHA256Managed pSha;
      private long pLength;
      private long pPosition;
      private byte[] pReadBuf;
      private byte[] pDecryptBuf;

      public CarotCryptStream(EncryptFs fs, Uri uri, Stream basestream, ICryptoTransform transformer, long length)
      {
        this.pFs = fs;
        this.pUri = uri;
        this.pTransform = transformer;
        this.pMode = CryptoStreamMode.Write;
        this.pSha = new SHA256Managed();
        this.pLength = length;
        this.pPosition = 0L;
        byte[] buffer = new byte[64];
        Encoding.UTF8.GetBytes("CarotDAV Encryption 1.0 ").CopyTo((Array) buffer, 0);
        basestream.Write(buffer, 0, buffer.Length);
        CloseNotifyStream closeNotifyStream = new CloseNotifyStream(basestream);
        closeNotifyStream.ClosingEvent += new EventHandler(this.Stream_Closing);
        closeNotifyStream.ClosedEvent += new EventHandler(this.Stream_Closed);
        this.pStream = (Stream) new CryptoStream((Stream) closeNotifyStream, this.pTransform, this.pMode);
      }

      public CarotCryptStream(EncryptFs fs, ResourceId id, Stream basestream, ICryptoTransform transformer, long length)
      {
        this.pFs = fs;
        this.pReturnedInfo = (ReturnedInfo) id;
        this.pTransform = transformer;
        this.pMode = CryptoStreamMode.Read;
        this.pSha = new SHA256Managed();
        this.pLength = length;
        this.pPosition = 0L;
        this.pStream = basestream;
        byte[] numArray = new byte[144];
        int offset = 0;
        while (offset < numArray.Length)
        {
          int num = this.pStream.Read(numArray, offset, checked (numArray.Length - offset));
          if (num == 0)
            throw new InconsistencyDetectedException(this.pUri, "Encrypted file broken");
          checked { offset += num; }
        }
        if (Operators.CompareString(Encoding.UTF8.GetString(numArray, 0, 24), "CarotDAV Encryption 1.0 ", false) != 0)
          throw new InconsistencyDetectedException(this.pUri, "Encrypted file broken");
        this.pReadBuf = new byte[80];
        Array.Copy((Array) numArray, 64, (Array) this.pReadBuf, 0, this.pReadBuf.Length);
        this.pDecryptBuf = new byte[0];
      }

      public ReturnedInfo ReturnedInfo
      {
        get
        {
          return this.pReturnedInfo;
        }
      }

      public override bool CanRead
      {
        get
        {
          return this.pMode == CryptoStreamMode.Read;
        }
      }

      public override bool CanWrite
      {
        get
        {
          return this.pMode == CryptoStreamMode.Write;
        }
      }

      public override bool CanSeek
      {
        get
        {
          return false;
        }
      }

      public override void Flush()
      {
        this.pStream.Flush();
      }

      public override long Length
      {
        get
        {
          return this.pLength;
        }
      }

      public override long Position
      {
        get
        {
          return this.pPosition;
        }
        set
        {
          throw new NotImplementedException();
        }
      }

      public override long Seek(long offset, SeekOrigin origin)
      {
        throw new NotImplementedException();
      }

      public override void SetLength(long value)
      {
        throw new NotImplementedException();
      }

      public override int Read(byte[] buffer, int offset, int count)
      {
        if (this.pMode != CryptoStreamMode.Read)
          throw new InvalidOperationException();
        if (this.pStream == null)
          throw new ObjectDisposedException(this.GetType().FullName);
        if (this.pLength >= 0L && checked (this.pPosition + (long) count) > this.pLength)
          count = checked ((int) (this.pLength - this.pPosition));
        if (count < 0)
          throw new ArgumentOutOfRangeException(nameof (count));
        if (count == 0)
          return 0;
        int num1 = 0;
label_11:
        int num2 = count;
        if (num2 > this.pDecryptBuf.Length)
          num2 = this.pDecryptBuf.Length;
        Array.Copy((Array) this.pDecryptBuf, 0, (Array) buffer, offset, num2);
        checked { count -= num2; }
        checked { offset += num2; }
        checked { num1 += num2; }
        this.pPosition = checked (this.pPosition + (long) num2);
        byte[] numArray1 = new byte[checked (this.pDecryptBuf.Length - num2 - 1 + 1)];
        Array.Copy((Array) this.pDecryptBuf, num2, (Array) numArray1, 0, checked (this.pDecryptBuf.Length - num2));
        this.pDecryptBuf = numArray1;
        if (count == 0)
          return num1;
        int num3 = checked (count + 15) & -16;
        byte[] numArray2 = new byte[checked (num3 - 1 + 1)];
        int num4 = 0;
        while (num4 < numArray2.Length)
        {
          int num5 = this.pStream.Read(numArray2, num4, checked (numArray2.Length - num4));
          if (num5 == 0)
          {
            byte[] inputBuffer = new byte[checked (this.pReadBuf.Length + num4 - 1 + 1)];
            Array.Copy((Array) this.pReadBuf, 0, (Array) inputBuffer, 0, this.pReadBuf.Length);
            Array.Copy((Array) numArray2, 0, (Array) inputBuffer, this.pReadBuf.Length, num4);
            byte[] numArray3 = new byte[64];
            Array.Copy((Array) inputBuffer, checked (inputBuffer.Length - numArray3.Length), (Array) numArray3, 0, numArray3.Length);
            byte[] numArray4 = this.pTransform.TransformFinalBlock(inputBuffer, 0, checked (num4 + 15) & -16);
            this.pDecryptBuf = new byte[checked (num4 - 1 + 1)];
            Array.Copy((Array) numArray4, 0, (Array) this.pDecryptBuf, 0, this.pDecryptBuf.Length);
            this.pSha.TransformFinalBlock(this.pDecryptBuf, 0, this.pDecryptBuf.Length);
            string s = "";
            int num6 = 0;
            int num7 = checked (this.pSha.Hash.Length - 1);
            int index1 = num6;
            while (index1 <= num7)
            {
              s += this.pSha.Hash[index1].ToString("X2");
              checked { ++index1; }
            }
            byte[] bytes = Encoding.UTF8.GetBytes(s);
            if (bytes.Length != numArray3.Length)
              throw new IOException("File hash doesn't match.");
            int num8 = 0;
            int num9 = checked (bytes.Length - 1);
            int index2 = num8;
            while (index2 <= num9)
            {
              if ((int) bytes[index2] != (int) numArray3[index2])
                throw new IOException("File hash doesn't match.");
              checked { ++index2; }
            }
            if (this.pLength < 0L)
              this.pLength = checked (this.pPosition + (long) num4);
            else if (this.pLength > checked (this.pPosition + (long) num4))
              throw new InvalidRangeException();
            if (count > num4)
            {
              count = num4;
              goto label_11;
            }
            else
              goto label_11;
          }
          else
            checked { num4 += num5; }
        }
        byte[] numArray5 = new byte[checked (num3 - 1 + 1)];
        if (num3 < this.pReadBuf.Length)
        {
          numArray5 = new byte[checked (num3 - 1 + 1)];
          this.pTransform.TransformBlock(this.pReadBuf, 0, num3, numArray5, 0);
          Array.Copy((Array) this.pReadBuf, num3, (Array) this.pReadBuf, 0, checked (this.pReadBuf.Length - num3));
          Array.Copy((Array) numArray2, 0, (Array) this.pReadBuf, checked (this.pReadBuf.Length - num3), num3);
        }
        else
        {
          this.pTransform.TransformBlock(this.pReadBuf, 0, this.pReadBuf.Length, numArray5, 0);
          this.pTransform.TransformBlock(numArray2, 0, checked (numArray2.Length - this.pReadBuf.Length), numArray5, this.pReadBuf.Length);
          Array.Copy((Array) numArray2, checked (numArray2.Length - this.pReadBuf.Length), (Array) this.pReadBuf, 0, this.pReadBuf.Length);
        }
        this.pSha.TransformBlock(numArray5, 0, numArray2.Length, (byte[]) null, 0);
        Array.Copy((Array) numArray5, 0, (Array) buffer, offset, count);
        this.pPosition = checked (this.pPosition + (long) count);
        int num10 = checked (num1 + count);
        this.pDecryptBuf = new byte[checked (num3 - count - 1 + 1)];
        Array.Copy((Array) numArray5, count, (Array) this.pDecryptBuf, 0, this.pDecryptBuf.Length);
        return num10;
      }

      public override void Write(byte[] buffer, int offset, int count)
      {
        if (this.pStream == null)
          throw new ObjectDisposedException(this.GetType().FullName);
        if (this.pMode != CryptoStreamMode.Write)
          throw new InvalidOperationException();
        if (this.pLength >= 0L && checked (this.pPosition + (long) count) > this.pLength)
          throw new InvalidRangeException();
        if (count == 0)
          return;
        this.pSha.TransformBlock(buffer, offset, count, (byte[]) null, 0);
        this.pStream.Write(buffer, offset, count);
        this.pPosition = checked (this.pPosition + (long) count);
      }

      protected override void Dispose(bool disposing)
      {
        try
        {
          if (!disposing)
            return;
          switch (this.pMode)
          {
            case CryptoStreamMode.Read:
              if (this.pStream == null)
                break;
              this.pStream.Close();
              this.pStream = (Stream) null;
              break;
            case CryptoStreamMode.Write:
              if (this.pStream == null)
                break;
              this.pStream.Close();
              this.pStream = (Stream) null;
              break;
            default:
              throw new Exception();
          }
        }
        finally
        {
          base.Dispose(disposing);
        }
      }

      private void Stream_Closing(object sender, EventArgs e)
      {
        if (this.pMode != CryptoStreamMode.Write)
          throw new InvalidOperationException();
        CloseNotifyStream closeNotifyStream = (CloseNotifyStream) sender;
        int num1 = checked ((int) unchecked (this.pPosition % (long) this.pTransform.OutputBlockSize));
        if (num1 == 0)
          num1 = 16;
        byte[] buffer = new byte[checked (num1 - 1 + 1)];
        closeNotifyStream.Write(buffer, 0, buffer.Length);
        this.pSha.TransformFinalBlock(new byte[0], 0, 0);
        string s = "";
        int num2 = 0;
        int num3 = checked (this.pSha.Hash.Length - 1);
        int index = num2;
        while (index <= num3)
        {
          s += this.pSha.Hash[index].ToString("X2");
          checked { ++index; }
        }
        byte[] bytes = Encoding.UTF8.GetBytes(s);
        if (bytes.Length != 64)
          throw new IOException();
        closeNotifyStream.Write(bytes, 0, bytes.Length);
      }

      private void Stream_Closed(object sender, EventArgs e)
      {
        if (this.pMode != CryptoStreamMode.Write)
          throw new InvalidOperationException();
        ReturnedInfo returnedInfo = this.pFs.basefs.CloseWrite(((CloseNotifyStream) sender).BaseStream);
        ResourceInfo ri = returnedInfo as ResourceInfo;
        if (ri != null)
        {
          this.pFs.CreateInfo2(this.pUri, ri, true);
          this.pReturnedInfo = (ReturnedInfo) ri;
        }
        else
          this.pReturnedInfo = (ReturnedInfo) new EncryptFs.EncryptId(this.pUri, returnedInfo as ResourceId, true, this.pFs);
        if (this.pLength >= 0L && this.pPosition != this.pLength)
          throw new InvalidRangeException();
      }
    }

    [Serializable]
    public class EncryptId : ResourceId
    {
      private ResourceId pBaseId;
      private bool pEncrypted;

      public EncryptId(Uri target, ResourceId baseid, bool encrypted, EncryptFs fs)
        : base(target, (FsBase) fs)
      {
        this.pBaseId = baseid;
        this.pEncrypted = encrypted;
      }

      public ResourceId BaseId
      {
        get
        {
          return this.pBaseId;
        }
      }

      public bool Encrypted
      {
        get
        {
          return this.pEncrypted;
        }
      }
    }
  }
}