text: /* Copyright (c) 2001 Matej Pfajfar.
   * Copyright (c) 2001-2004, Roger Dingledine.
   * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
   * Copyright (c) 2007-2017, The Tor Project, Inc. */
  /* See LICENSE for licensing information */
  
  /**
   * \file relay.h
   * \brief Header file for relay.c.
   **/
  
  #ifndef TOR_RELAY_CRYPTO_H
  #define TOR_RELAY_CRYPTO_H
  
  int relay_crypto_init(relay_crypto_t *crypto,
                        const char *key_data, size_t key_data_len,
                        int reverse, int is_hs_v3);
  
  int relay_decrypt_cell(circuit_t *circ, cell_t *cell,
                         cell_direction_t cell_direction,
                         crypt_path_t **layer_hint, char *recognized);
  void relay_encrypt_cell_outbound(cell_t *cell, origin_circuit_t *or_circ,
                              crypt_path_t *layer_hint);
  void relay_encrypt_cell_inbound(cell_t *cell, or_circuit_t *or_circ);
  
  void relay_crypto_clear(relay_crypto_t *crypto);
  
  void relay_crypto_assert_ok(const relay_crypto_t *crypto);
  
  #endif /* !defined(TOR_RELAY_CRYPTO_H) */
  
  