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- /* Copyright (c) 2017-2018, The Tor Project, Inc. */
- /* See LICENSE for licensing information */
- #ifndef TOR_HS_NTOR_H
- #define TOR_HS_NTOR_H
- #include "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 {
- /* 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;
- 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 uint8_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(
- 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 uint8_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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