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- /* Copyright (c) 2012-2019, The Tor Project, Inc. */
- /* See LICENSE for licensing information */
- #ifndef TOR_ONION_NTOR_H
- #define TOR_ONION_NTOR_H
- #include "lib/cc/torint.h"
- struct di_digest256_map_t;
- struct curve25519_public_key_t;
- struct curve25519_keypair_t;
- /** State to be maintained by a client between sending an ntor onionskin
- * and receiving a reply. */
- typedef struct ntor_handshake_state_t ntor_handshake_state_t;
- /** Length of an ntor onionskin, as sent from the client to server. */
- #define NTOR_ONIONSKIN_LEN 84
- /** Length of an ntor reply, as sent from server to client. */
- #define NTOR_REPLY_LEN 64
- void ntor_handshake_state_free_(ntor_handshake_state_t *state);
- #define ntor_handshake_state_free(state) \
- FREE_AND_NULL(ntor_handshake_state_t, ntor_handshake_state_free_, (state))
- int onion_skin_ntor_create(const uint8_t *router_id,
- const struct curve25519_public_key_t *router_key,
- ntor_handshake_state_t **handshake_state_out,
- uint8_t *onion_skin_out);
- int onion_skin_ntor_server_handshake(const uint8_t *onion_skin,
- const struct di_digest256_map_t *private_keys,
- const struct curve25519_keypair_t *junk_keypair,
- const uint8_t *my_node_id,
- uint8_t *handshake_reply_out,
- uint8_t *key_out,
- size_t key_out_len);
- int onion_skin_ntor_client_handshake(
- const ntor_handshake_state_t *handshake_state,
- const uint8_t *handshake_reply,
- uint8_t *key_out,
- size_t key_out_len,
- const char **msg_out);
- #ifdef ONION_NTOR_PRIVATE
- #include "lib/crypt_ops/crypto_curve25519.h"
- /** Storage held by a client while waiting for an ntor reply from a server. */
- struct ntor_handshake_state_t {
- /** Identity digest of the router we're talking to. */
- uint8_t router_id[DIGEST_LEN];
- /** Onion key of the router we're talking to. */
- curve25519_public_key_t pubkey_B;
- /**
- * Short-lived keypair for use with this handshake.
- * @{ */
- curve25519_secret_key_t seckey_x;
- curve25519_public_key_t pubkey_X;
- /** @} */
- };
- #endif /* defined(ONION_NTOR_PRIVATE) */
- #endif /* !defined(TOR_ONION_NTOR_H) */
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