code: def _quote(data):
      
      data = data.replace(b'\\', b'\\\\')
      data = data.replace(b'"', b'\\"')
      return data
docs: Prepare a string for quoting for DIGEST-MD5 challenge or response.
  
      Don't add the quotes, only escape '"' and "\\" with backslashes.
  
      :Parameters:
          - `data`: a raw string.
      :Types:
          - `data`: `bytes`
  
      :return: `data` with '"' and "\\" escaped using "\\".
      :returntype: `bytes`