public static DecryptedStream Create(Stream encryptedStream, string sharedSecret, string salt, int contentLength)
{
var instance = new DecryptedStream();
TaskHelper.WaitSafeSync(() => instance.InitAsync(encryptedStream, sharedSecret, salt, contentLength));
return(instance);
}
public async static Task <DecryptedStream> CreateAsync(Stream encryptedStream, string sharedSecret, string salt, int contentLength)
{
var instance = new DecryptedStream();
await instance.InitAsync(encryptedStream, sharedSecret, salt, contentLength)
.IgnoreContext();
return(instance);
}
public async Task <FileStorageResponse> GetContentAsync(string fileName, StorageEncryptionKeys encryptionKeys)
{
Stream contentStream = null;
Stream returnStream = null;
try
{
var response = await _storage.GetContentAsync(fileName)
.IgnoreContext();
contentStream = response.Stream;
int contentLength = (int)response.ContentLength;
if (encryptionKeys != null)
{
response.Stream = await DecryptedStream.CreateAsync(contentStream, encryptionKeys.Secret, encryptionKeys.Salt, contentLength).IgnoreContext();
}
else
{
returnStream = contentStream as MemoryStream;
if (returnStream == null)
{
returnStream = new MemoryStream(contentLength);
await contentStream.CopyToAsync(returnStream, Math.Min(80 * 1024, contentLength)).IgnoreContext();
}
returnStream.Position = 0;
response.Stream = returnStream;
}
return(response);
}
finally
{
//closes the remote stream
if (contentStream != null && !object.ReferenceEquals(contentStream, returnStream))
{
contentStream.Dispose();
}
}
}
