public async Task DownloadRemoteBlock( )
{
if (!IsModified)
{
byte [] downloadedData = await PageBlobProvider.DownloadFile(RemoteFileName);
if (Metadata.IsEncrypted)
{
using Aes aes = Aes.Create( );
aes.Key = Metadata.AesKey;
aes.IV = Metadata.AesIV;
aes.Mode = CipherMode.CBC;
aes.Padding = PaddingMode.PKCS7;
using ICryptoTransform decryptor = aes.CreateDecryptor( );
Content = decryptor.TransformFinalBlock(
downloadedData,
0,
downloadedData.Length);
}
else
{
Content = downloadedData;
}
}
else
{
throw new InvalidOperationException( );
}
}
public async Task UpdateRemoteBlock( )
{
if (IsModified)
{
byte [] dataToUpload = null;
if (Metadata.IsEncrypted)
{
using Aes aes = Aes.Create( );
aes.Mode = CipherMode.CBC;
aes.Padding = PaddingMode.PKCS7;
using ICryptoTransform encryptor = aes.CreateEncryptor( );
dataToUpload =
encryptor.TransformFinalBlock(Content, 0, Content.Length);
Metadata.AesKey = aes.Key;
Metadata.AesIV = aes.IV;
}
else
{
lock ( Content )
{
dataToUpload = ( byte [] )Content.Clone( );
}
}
await PageBlobProvider.UploadFile(RemoteFileName, dataToUpload);
IsModified = false;
Metadata.RemoteFileName = RemoteFileName;
CloudFileSystem.Current.FlushMetadata( );
}
}
public void UpdateQuota( )
{
Logger.LogTrace("Update Quota");
Quota = PageBlobProvider.GetQuota( );
}