packet-nts-ke.h

/* packet-nts-ke.h
 *
 * Copyright (c) 2024 by Martin Mayer <[email protected]>
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <[email protected]>
 * Copyright 1998 Gerald Combs
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */
 
#ifndef __PACKET_NTS_KE_H__
#define __PACKET_NTS_KE_H__
 
#include <wsutil/wsgcrypt.h>
 
#define NTS_KE_TLS13_KEY_MAX_LEN     64
 
typedef struct _nts_aead {
    uint16_t    id;             /* IANA assigned AEAD parameter ID */
    uint16_t    cipher;         /* gcrypt cipher */
    uint8_t     mode;           /* gcrypt cipher mode */
    uint16_t    key_len;        /* Length of key for this cipher */
    uint16_t    tag_len;        /* Length of authentication tag for this cipher */
} nts_aead;
 
typedef struct _nts_cookie_t {
    uint32_t    frame_received;                    /* Frame no. which provided the cookie */
    wmem_list_t *frames_used;                      /* List of frame no. which used the cookie */
    wmem_list_t *frames_used_uid;                  /* List of request UIDs which used the cookie */
    uint16_t    aead;                              /* AEAD parameter */
    bool        keys_present;                      /* Are keys present (export successful) */
    uint8_t     key_c2s[NTS_KE_TLS13_KEY_MAX_LEN]; /* Derived client to server key */
    uint8_t     key_s2c[NTS_KE_TLS13_KEY_MAX_LEN]; /* Derived server to client key */
} nts_cookie_t;
 
/* Helper structure to pass data to nts_append_used_frames_to_tree() */
typedef struct _nts_used_frames_lookup_t {
    tvbuff_t *tvb;
    proto_tree *tree;
    int hfindex;
} nts_used_frames_lookup_t;

nts_cookie_t* nts_new_cookie(tvbuff_t *tvb, uint16_t aead, packet_info *pinfo);

nts_cookie_t* nts_new_cookie_copy(tvbuff_t *tvb, nts_cookie_t *ref_cookie, packet_info *pinfo);

nts_cookie_t* nts_use_cookie(tvbuff_t *tvb_cookie, tvbuff_t *tvb_uid, packet_info *pinfo);

nts_cookie_t* nts_find_cookie_by_uid(tvbuff_t *tvb_uid);

const nts_aead * nts_find_aead(uint16_t id);

void nts_append_used_frames_to_tree(void *data, void *user_data);
 
#endif