Method Request

lib/protocol/encryption.go:211–254

(ctx context.Context, req *Request)

}

func (e encryptedConnection) Request(ctx context.Context, req *Request) ([]byte, error) {
	folderKey, ok := e.folderKeys.get(req.Folder)
	if !ok {
		return e.conn.Request(ctx, req)
	}
	fileKey := e.keyGen.FileKey(req.Name, folderKey)

	// Encrypt / adjust the request parameters.

	encSize := req.Size
	if encSize < minPaddedSize {
		// Make a request for minPaddedSize data instead of the smaller
		// block. We'll chop of the extra data later.
		encSize = minPaddedSize
	}
	encSize += blockOverhead
	encName := encryptName(req.Name, folderKey)
	encOffset := req.Offset + int64(req.BlockNo*blockOverhead)
	encHash := encryptBlockHash(req.Hash, req.Offset, fileKey)

	// Perform that request, getting back an encrypted block.

	encReq := &Request{
		ID:      req.ID,
		Folder:  req.Folder,
		Name:    encName,
		Offset:  encOffset,
		Size:    encSize,
		Hash:    encHash,
		BlockNo: req.BlockNo,
	}
	bs, err := e.conn.Request(ctx, encReq)
	if err != nil {
		return nil, err
	}

	// Return the decrypted block (or an error if it fails decryption)

	bs, err = DecryptBytes(bs, fileKey)
	if err != nil {
		return nil, err
	}
	return bs[:req.Size], nil
}

func (e encryptedConnection) DownloadProgress(ctx context.Context, dp *DownloadProgress) {
	if _, ok := e.folderKeys.get(dp.Folder); !ok {