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/* Copyright (c) 2012-2013, The Tor Project, Inc. */
/* See LICENSE for licensing information */
#ifndef TOR_ONION_NTOR_H
#define TOR_ONION_NTOR_H
#include "torint.h"
#include "crypto_curve25519.h"
#include "di_ops.h"
/** 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
#ifdef CURVE25519_ENABLED
void ntor_handshake_state_free(ntor_handshake_state_t *state);
int onion_skin_ntor_create(const uint8_t *router_id,
const 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 di_digest256_map_t *private_keys,
const 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);
#ifdef ONION_NTOR_PRIVATE
/** 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
#endif
#endif
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