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/* Copyright (c) 2017, The Tor Project, Inc. */
/* See LICENSE for licensing information */
#ifndef TOR_HS_NTOR_H
#define TOR_HS_NTOR_H
#include "or.h"
/* Key material needed to encode/decode INTRODUCE1 cells */
typedef struct {
/* 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 {
/* 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;
/* Key material resulting from key expansion as detailed in section "4.2.1. Key
* expansion" of rend-spec-ng.txt. */
typedef struct {
/* Per-circuit key material used in ESTABLISH_INTRO cell */
uint8_t KH[DIGEST256_LEN];
/* Authentication key for outgoing RELAY cells */
uint8_t Df[DIGEST256_LEN];
/* Authentication key for incoming RELAY cells */
uint8_t Db[DIGEST256_LEN];
/* Encryption key for outgoing RELAY cells */
uint8_t Kf[CIPHER256_KEY_LEN];
/* Decryption key for incoming RELAY cells */
uint8_t Kb[CIPHER256_KEY_LEN];
} hs_ntor_rend_circuit_keys_t;
int hs_ntor_client_get_introduce1_keys(
const ed25519_public_key_t *intro_auth_pubkey,
const curve25519_public_key_t *intro_enc_pubkey,
const curve25519_keypair_t *client_ephemeral_enc_keypair,
const uint8_t *subcredential,
hs_ntor_intro_cell_keys_t *hs_ntor_intro_cell_keys_out);
int hs_ntor_client_get_rendezvous1_keys(
const ed25519_public_key_t *intro_auth_pubkey,
const curve25519_keypair_t *client_ephemeral_enc_keypair,
const curve25519_public_key_t *intro_enc_pubkey,
const 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(
const ed25519_public_key_t *intro_auth_pubkey,
const curve25519_keypair_t *intro_enc_keypair,
const curve25519_public_key_t *client_ephemeral_enc_pubkey,
const uint8_t *subcredential,
hs_ntor_intro_cell_keys_t *hs_ntor_intro_cell_keys_out);
int hs_ntor_service_get_rendezvous1_keys(
const ed25519_public_key_t *intro_auth_pubkey,
const curve25519_keypair_t *intro_enc_keypair,
const curve25519_keypair_t *service_ephemeral_rend_keypair,
const curve25519_public_key_t *client_ephemeral_enc_pubkey,
hs_ntor_rend_cell_keys_t *hs_ntor_rend_cell_keys_out);
hs_ntor_rend_circuit_keys_t *hs_ntor_circuit_key_expansion(
const hs_ntor_rend_cell_keys_t *hs_ntor_rend_cell_keys);
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
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