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/* Copyright (c) 2017-2020, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* @file hs_ntor.h
* @brief Header for hs_ntor.c
**/
#ifndef TOR_HS_NTOR_H
#define TOR_HS_NTOR_H
#include "core/or/or.h"
struct ed25519_public_key_t;
struct curve25519_public_key_t;
struct curve25519_keypair_t;
/* Output length of KDF for key expansion */
#define HS_NTOR_KEY_EXPANSION_KDF_OUT_LEN \
(DIGEST256_LEN*2 + CIPHER256_KEY_LEN*2)
/* Key material needed to encode/decode INTRODUCE1 cells */
typedef struct hs_ntor_intro_cell_keys_t {
/* Key used for encryption of encrypted INTRODUCE1 blob */
uint8_t enc_key[CIPHER256_KEY_LEN];
/* MAC key used to protect encrypted INTRODUCE1 blob */
uint8_t mac_key[DIGEST256_LEN];
} hs_ntor_intro_cell_keys_t;
/* Key material needed to encode/decode RENDEZVOUS1 cells */
typedef struct hs_ntor_rend_cell_keys_t {
/* This is the MAC of the HANDSHAKE_INFO field */
uint8_t rend_cell_auth_mac[DIGEST256_LEN];
/* This is the key seed used to derive further rendezvous crypto keys as
* detailed in section 4.2.1 of rend-spec-ng.txt. */
uint8_t ntor_key_seed[DIGEST256_LEN];
} hs_ntor_rend_cell_keys_t;
#define SUBCRED_LEN DIGEST256_LEN
/**
* A 'subcredential' used to prove knowledge of a hidden service.
**/
typedef struct hs_subcredential_t {
uint8_t subcred[SUBCRED_LEN];
} hs_subcredential_t;
int hs_ntor_client_get_introduce1_keys(
const struct ed25519_public_key_t *intro_auth_pubkey,
const struct curve25519_public_key_t *intro_enc_pubkey,
const struct curve25519_keypair_t *client_ephemeral_enc_keypair,
const hs_subcredential_t *subcredential,
hs_ntor_intro_cell_keys_t *hs_ntor_intro_cell_keys_out);
int hs_ntor_client_get_rendezvous1_keys(
const struct ed25519_public_key_t *intro_auth_pubkey,
const struct curve25519_keypair_t *client_ephemeral_enc_keypair,
const struct curve25519_public_key_t *intro_enc_pubkey,
const struct curve25519_public_key_t *service_ephemeral_rend_pubkey,
hs_ntor_rend_cell_keys_t *hs_ntor_rend_cell_keys_out);
int hs_ntor_service_get_introduce1_keys_multi(
const struct ed25519_public_key_t *intro_auth_pubkey,
const struct curve25519_keypair_t *intro_enc_keypair,
const struct curve25519_public_key_t *client_ephemeral_enc_pubkey,
size_t n_subcredentials,
const hs_subcredential_t *subcredentials,
hs_ntor_intro_cell_keys_t *hs_ntor_intro_cell_keys_out);
int hs_ntor_service_get_introduce1_keys(
const struct ed25519_public_key_t *intro_auth_pubkey,
const struct curve25519_keypair_t *intro_enc_keypair,
const struct curve25519_public_key_t *client_ephemeral_enc_pubkey,
const hs_subcredential_t *subcredential,
hs_ntor_intro_cell_keys_t *hs_ntor_intro_cell_keys_out);
int hs_ntor_service_get_rendezvous1_keys(
const struct ed25519_public_key_t *intro_auth_pubkey,
const struct curve25519_keypair_t *intro_enc_keypair,
const struct curve25519_keypair_t *service_ephemeral_rend_keypair,
const struct curve25519_public_key_t *client_ephemeral_enc_pubkey,
hs_ntor_rend_cell_keys_t *hs_ntor_rend_cell_keys_out);
int hs_ntor_circuit_key_expansion(const uint8_t *ntor_key_seed,
size_t seed_len,
uint8_t *keys_out, size_t keys_out_len);
int hs_ntor_client_rendezvous2_mac_is_good(
const hs_ntor_rend_cell_keys_t *hs_ntor_rend_cell_keys,
const uint8_t *rcvd_mac);
#endif /* !defined(TOR_HS_NTOR_H) */
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