public async Task <MemoryStream> DownloadFile(ViewFile file, string receiverEmail, RSAParameters receiverKey)
{
using (var encryptedStream = new MemoryStream())
using (var jsonFileData = new MemoryStream())
{
var decryptedStream = new MemoryStream();
await DownloadFile(file.JsonFileId, jsonFileData);
var fileData = FileDataHelpers.DownloadFileData(jsonFileData, receiverEmail);
await DownloadFile(file.Id, encryptedStream);
var senderKey = new RSAParameters
{
Exponent = fileData.SenderPublicKey.Expontent,
Modulus = fileData.SenderPublicKey.Modulus
};
var isValid = SafeCloudFile.VerifySignedFile(encryptedStream, fileData.FileSign, senderKey);
if (!isValid)
{
throw new Exception("Invalid file sign!");
}
SafeCloudFile.Decrypt(encryptedStream, decryptedStream, fileData.UserKeys[receiverEmail], receiverKey);
return(decryptedStream);
}
}
public async Task <SharedDownload> DownloadShared(string encryptedFileLink, string jsonFileLink, string receiverEmail, RSAParameters receiverKey)
{
using (var jsonStream = new MemoryStream())
using (var encryptedStream = new MemoryStream())
{
var decryptedStream = new MemoryStream();
await GetFileStream(jsonFileLink, jsonStream);
var fileData = FileDataHelpers.DownloadFileData(jsonStream, receiverEmail);
await GetFileStream(encryptedFileLink, encryptedStream);
var senderKey = new RSAParameters
{
Exponent = fileData.SenderPublicKey.Expontent,
Modulus = fileData.SenderPublicKey.Modulus
};
var isValid = SafeCloudFile.VerifySignedFile(encryptedStream, fileData.FileSign, senderKey);
if (!isValid)
{
throw new Exception("Invalid file sign!");
}
SafeCloudFile.Decrypt(encryptedStream, decryptedStream, fileData.UserKeys[receiverEmail], receiverKey);
jsonStream.Close();
encryptedStream.Close();
return(new SharedDownload(decryptedStream, fileData.FileName));
}
}
public async Task <MemoryStream> DownloadFile(ViewFile file, string receiverEmail, RSAParameters receiverKey)
{
var decryptedStream = new MemoryStream();
var jsonFileData = await _graphServiceClient.Me.Drive.Special.AppRoot
.ItemWithPath(file.Name.Split('.').First() + ".json")
.Content.Request().GetAsync() as MemoryStream;
if (jsonFileData == null)
{
throw new Exception("Error while downloading json file!");
}
var fileData = FileDataHelpers.DownloadFileData(jsonFileData, receiverEmail);
var encryptedStream = await _graphServiceClient.Me.Drive.Special.AppRoot.ItemWithPath(file.Name).Content
.Request()
.GetAsync() as MemoryStream;
if (encryptedStream == null)
{
throw new Exception("Error while downloading encrypted file!");
}
var senderKey = new RSAParameters
{
Exponent = fileData.SenderPublicKey.Expontent,
Modulus = fileData.SenderPublicKey.Modulus
};
encryptedStream.Position = 0;
var isValid = SafeCloudFile.VerifySignedFile(encryptedStream, fileData.FileSign, senderKey);
if (!isValid)
{
throw new Exception("Invalid file sign!");
}
SafeCloudFile.Decrypt(encryptedStream, decryptedStream, fileData.UserKeys[receiverEmail], receiverKey);
jsonFileData.Close();
encryptedStream.Close();
return(decryptedStream);
}
public async Task <MemoryStream> DownloadFile(ViewFile file, string receiverEmail, RSAParameters receiverKey)
{
using (var encryptedStream = new MemoryStream())
using (var jsonFileData = new MemoryStream())
{
var decryptedStream = new MemoryStream();
var jsonFileDownloadProgress =
await _driveService.Files.Get(file.JsonFileId).DownloadAsync(jsonFileData);
if (jsonFileDownloadProgress.Status != DownloadStatus.Completed)
{
throw new Exception("Error while downloading json file!");
}
var fileData = FileDataHelpers.DownloadFileData(jsonFileData, receiverEmail);
var encryptedFileDownloadProgress =
await _driveService.Files.Get(file.Id).DownloadAsync(encryptedStream);
if (encryptedFileDownloadProgress.Status != DownloadStatus.Completed)
{
throw new Exception("Error while downloading encrypted file!");
}
var senderKey = new RSAParameters
{
Exponent = fileData.SenderPublicKey.Expontent,
Modulus = fileData.SenderPublicKey.Modulus
};
encryptedStream.Position = 0;
var isValid = SafeCloudFile.VerifySignedFile(encryptedStream, fileData.FileSign, senderKey);
if (!isValid)
{
throw new Exception("Invalid file sign!");
}
SafeCloudFile.Decrypt(encryptedStream, decryptedStream, fileData.UserKeys[receiverEmail], receiverKey);
return(decryptedStream);
}
}
