docs: def UploadSignedConfigBlob(content,
                             aff4_path,
                             client_context=None,
                             limit=None,
                             token=None):
    """Upload a signed blob into the datastore.
  
    Args:
      content: File content to upload.
      aff4_path: aff4 path to upload to.
      client_context: The configuration contexts to use.
      limit: The maximum size of the chunk to use.
      token: A security token.
  
    Raises:
      IOError: On failure to write.
    """
    if limit is None:
      limit = config.CONFIG["Datastore.maximum_blob_size"]
  
    # Get the values of these parameters which apply to the client running on the
    # target platform.
    if client_context is None:
      # Default to the windows client.
      client_context = ["Platform:Windows", "Client Context"]
  
    config.CONFIG.Validate(
        parameters="PrivateKeys.executable_signing_private_key")
  
    signing_key = config.CONFIG.Get(
        "PrivateKeys.executable_signing_private_key", context=client_context)
  
    verification_key = config.CONFIG.Get(
        "Client.executable_signing_public_key", context=client_context)
  
    signed_binary_utils.WriteSignedBinary(
        rdfvalue.RDFURN(aff4_path),
        content,
        signing_key,
        public_key=verification_key,
        chunk_size=limit,
        token=token)
  
    logging.info("Uploaded to %s", aff4_path)