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