message: Get bytes from blob using "download_as_bytes" instead of deprecated "download_as_string".
diff: @@ -97,7 +97,7 @@ def main(argv):
  blob.upload_from_string(output_data)
  elif FLAGS.mode == 'decrypt':
  - ciphertext = blob.download_as_string()
  + ciphertext = blob.download_as_bytes()
  with open(FLAGS.local_path, 'wb') as output_file:
  output_file.write(env_aead.decrypt(ciphertext, associated_data))
  