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- /* Copyright (c) 2001 Matej Pfajfar.
- * Copyright (c) 2001-2004, Roger Dingledine.
- * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
- * Copyright (c) 2007-2018, The Tor Project, Inc. */
- /* See LICENSE for licensing information */
- #ifndef CRYPT_PATH_ST_H
- #define CRYPT_PATH_ST_H
- #include "or/relay_crypto_st.h"
- /** Holds accounting information for a single step in the layered encryption
- * performed by a circuit. Used only at the client edge of a circuit. */
- struct crypt_path_t {
- uint32_t magic;
- /** Cryptographic state used for encrypting and authenticating relay
- * cells to and from this hop. */
- relay_crypto_t crypto;
- /** Current state of the handshake as performed with the OR at this
- * step. */
- onion_handshake_state_t handshake_state;
- /** Diffie-hellman handshake state for performing an introduction
- * operations */
- crypto_dh_t *rend_dh_handshake_state;
- /** Negotiated key material shared with the OR at this step. */
- char rend_circ_nonce[DIGEST_LEN];/* KH in tor-spec.txt */
- /** Information to extend to the OR at this step. */
- extend_info_t *extend_info;
- /** Is the circuit built to this step? Must be one of:
- * - CPATH_STATE_CLOSED (The circuit has not been extended to this step)
- * - CPATH_STATE_AWAITING_KEYS (We have sent an EXTEND/CREATE to this step
- * and not received an EXTENDED/CREATED)
- * - CPATH_STATE_OPEN (The circuit has been extended to this step) */
- uint8_t state;
- #define CPATH_STATE_CLOSED 0
- #define CPATH_STATE_AWAITING_KEYS 1
- #define CPATH_STATE_OPEN 2
- struct crypt_path_t *next; /**< Link to next crypt_path_t in the circuit.
- * (The list is circular, so the last node
- * links to the first.) */
- struct crypt_path_t *prev; /**< Link to previous crypt_path_t in the
- * circuit. */
- int package_window; /**< How many cells are we allowed to originate ending
- * at this step? */
- int deliver_window; /**< How many cells are we willing to deliver originating
- * at this step? */
- };
- #endif
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