path: root/epan/dissectors/packet-wai.c

/* packet-wai.c
 * Routines for WAI packet dissection
 * Based on: WAPI ISO submission - ISO/IEC JTC 1 N 9880 [ref: 1]
 *           chapter "8.1.4 WAI protocol"
 *
 * Written by Lukasz Kotasa <lukasz.kotasa@tieto.com>
 *            Lukasz Suchy  <lukasz.suchy@tieto.com>
 * Copyright 2010, Tieto.
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */
/* Protocol reference:
 * http://isotc.iso.org/livelink/livelink?func=ll&objId=8500308&objAction=Open&ei=nt-RTKe1IJKTjAeepLS8BQ&usg=AFQjCNEn8hlU_SfoAGkM-X48JL_BL8bptA&sig2=JOHNPrqgCMO4q0cWhAfkow
 * (chapter: 8.1.4. WAI protocol)
 */


#include "config.h"

#include <epan/packet.h>
#include <epan/etypes.h>
#include <epan/reassemble.h>

#define WAI_SUB_PRE_AUTHENTICATION      0x01    /* pre-authentication start */
#define WAI_SUB_STAKEY_REQ              0x02    /* STAKey request */
#define WAI_SUB_AUTH_ACTIVATION         0x03    /* authentication activation */
#define WAI_SUB_ACCESS_AUTH_REQ         0x04    /* access authentication request */
#define WAI_SUB_ACCESS_AUTH_RESP        0x05    /* access authentication response */
#define WAI_SUB_CERT_AUTH_REQ           0x06    /* certificate authentication request */
#define WAI_SUB_CERT_AUTH_RESP          0x07    /* certificate authentication response */
#define WAI_SUB_UNICAST_KEY_REQ         0x08    /* unicast key negotiation request */
#define WAI_SUB_UNICAST_KEY_RESP        0x09    /* unicast key negotiation response */
#define WAI_SUB_UNICAST_KEY_CONFIRM     0x0A    /* unicast key negotiation confirmation */
#define WAI_SUB_MULTICAST_ANNOUNCE      0x0B    /* multicast key/STAKey announcement */
#define WAI_SUB_MULTICAST_ANNOUNCE_RESP 0x0C    /* multicast key/STAKey announcement response */

#define FLAG_BIT0       0x01
#define FLAG_BIT1       0x02
#define FLAG_BIT2       0x04
#define FLAG_BIT3       0x08
#define FLAG_BIT4       0x10
#define FLAG_BIT5       0x20
#define FLAG_BIT6       0x40
#define FLAG_BIT7       0x80

void proto_register_wai(void);
void proto_reg_handoff_wai(void);

static reassembly_table wai_reassembly_table;

static dissector_handle_t wai_handle;

static int proto_wai = -1;

static gint hf_wai_version = -1;
static gint hf_wai_type = -1;
static gint hf_wai_subtype = -1;
static gint hf_wai_reserved = -1;
static gint hf_wai_length = -1;
static gint hf_wai_seq = -1;
static gint hf_wai_fragm_seq = -1;
static gint hf_wai_flag = -1;
static gint hf_wai_data = -1;
static gint hf_wai_bk_rekeying_flag = -1;
static gint hf_wai_preauthentication_flag = -1;
static gint hf_wai_certificate_flag = -1;
static gint hf_wai_optional_flag = -1;
static gint hf_wai_usk_rekeying_flag = -1;
static gint hf_wai_negotiation_flag = -1;
static gint hf_wai_revoking_flag = -1;
static gint hf_wai_reserved_flag = -1;
static gint hf_wai_attr_type = -1;
static gint hf_wai_cert = -1;
static gint hf_wai_cert_id = -1;
static gint hf_wai_cert_data = -1;
static gint hf_wai_cert_len = -1;
static gint hf_wai_addid = -1;
static gint hf_wai_ae_mac = -1;
static gint hf_wai_asue_mac = -1;
static gint hf_wai_bkid = -1;
static gint hf_wai_uskid = -1;
static gint hf_wai_wie = -1;
static gint hf_wai_message_auth_code = -1;
static gint hf_wai_mskid = -1;
static gint hf_wai_data_pack_num = -1;
static gint hf_wai_key_data = -1;
static gint hf_wai_key_data_len = -1;
static gint hf_wai_key_data_content = -1;
static gint hf_wai_key_ann_id = -1;
static gint hf_wai_auth_id = -1;
static gint hf_wai_identity = -1;
static gint hf_wai_identity_id = -1;
static gint hf_wai_identity_len = -1;
static gint hf_wai_identity_data = -1;
static gint hf_wai_ecdh = -1;
static gint hf_wai_ecdh_id = -1;
static gint hf_wai_ecdh_len = -1;
static gint hf_wai_ecdh_content = -1;
static gint hf_wai_counter = -1;
static gint hf_wai_sta_key_id = -1;
static gint hf_wai_challenge = -1;
static gint hf_wai_cert_ver = -1;
static gint hf_wai_nonce = -1;
static gint hf_wai_ver_res = -1;
static gint hf_wai_sign_alg = -1;
static gint hf_wai_hash_alg_id = -1;
static gint hf_wai_sign_alg_id = -1;
static gint hf_wai_param = -1;
static gint hf_wai_param_id = -1;
static gint hf_wai_param_content = -1;
static gint hf_wai_sign_val = -1;
static gint hf_wai_sign_content = -1;
static gint hf_wai_sign = -1;
static gint hf_wai_identity_list = -1;
static gint hf_wai_reserved_byte = -1;
static gint hf_wai_no_of_ids = -1;
static gint hf_wai_access_res = -1;
static gint hf_wai_fragments = -1;
static gint hf_wai_fragment = -1;
static gint hf_wai_fragment_overlap = -1;
static gint hf_wai_fragment_overlap_conflicts = -1;
static gint hf_wai_fragment_multiple_tails = -1;
static gint hf_wai_fragment_too_long_fragment = -1;
static gint hf_wai_fragment_error = -1;
static gint hf_wai_fragment_count = -1;
static gint hf_wai_reassembled_in = -1;
static gint hf_wai_reassembled_length = -1;

static gint ett_wai = -1;
static gint ett_wai_data = -1;
static gint ett_wai_flags = -1;
static gint ett_wai_certificate = -1;
static gint ett_wai_mac = -1;
static gint ett_wai_identity = -1;
static gint ett_wai_key_data = -1;
static gint ett_wai_ecdh_param = -1;
static gint ett_wai_certificate_verification = -1;
static gint ett_wai_identity_list = -1;
static gint ett_wai_sign = -1;
static gint ett_wai_sign_alg = -1;
static gint ett_wai_sign_val = -1;
static gint ett_wai_parameter = -1;
static gint ett_wai_fragment = -1;
static gint ett_wai_fragments = -1;

static const value_string wai_type_names [] = {
    { 1, "WAI protocol package"},
    { 0, NULL }
};

static const value_string wai_attr_type_names [] = {
    { 1, "Signature"},
    { 2, "Certificate Authentication Result"},
    { 3, "Identity List"},
    { 0, NULL }
};

static const value_string wai_ver_res_names [] = {
    { 0, "Certificate is valid" },
    { 1, "Certificate issuer is unknown"},
    { 2, "Root certificate is untrusted"},
    { 3, "Certificate time is invalid"},
    { 4, "Certificate signature is invalid"},
    { 5, "Certificate is revoked"},
    { 6, "Certificate is not valid in its proposed usage"},
    { 7, "Certificate revocation state is unknown"},
    { 8, "Certificate has an unknown error"},
    { 0, NULL }
};

static const value_string wai_access_res_names [] = {
    { 0, "Success" },
    { 1, "Unidentified certificate"},
    { 2, "Certificate Error"},
    { 3, "Prohibited by AE"},
    { 0, NULL }
};

static const fragment_items wai_frag_items = {
    /* Fragment subtrees */
    &ett_wai_fragment,
    &ett_wai_fragments,
    /* Fragment fields */
    &hf_wai_fragments,
    &hf_wai_fragment,
    &hf_wai_fragment_overlap,
    &hf_wai_fragment_overlap_conflicts,
    &hf_wai_fragment_multiple_tails,
    &hf_wai_fragment_too_long_fragment,
    &hf_wai_fragment_error,
    &hf_wai_fragment_count,
    /* Reassembled in field */
    &hf_wai_reassembled_in,
    /* Reassembled length field */
    &hf_wai_reassembled_length,
    /* Reassembled data field */
    NULL,
    /* Tag */
    "Message fragments"
};

static const value_string wai_subtype_names[] = {
    {  WAI_SUB_PRE_AUTHENTICATION,      "Pre-Authentication start" },
    {  WAI_SUB_STAKEY_REQ,              "STAKey request" },
    {  WAI_SUB_AUTH_ACTIVATION,         "Authentication activation" },
    {  WAI_SUB_ACCESS_AUTH_REQ,         "Access authentication request" },
    {  WAI_SUB_ACCESS_AUTH_RESP,        "Access authentication response" },
    {  WAI_SUB_CERT_AUTH_REQ,           "Certificate authentication request" },
    {  WAI_SUB_CERT_AUTH_RESP,          "Certificate authentication response" },
    {  WAI_SUB_UNICAST_KEY_REQ,         "Unicast key negotiation request" },
    {  WAI_SUB_UNICAST_KEY_RESP,        "Unicast key negotiation response" },
    {  WAI_SUB_UNICAST_KEY_CONFIRM,     "Unicast key negotiation confirmation" },
    {  WAI_SUB_MULTICAST_ANNOUNCE,      "Multicast key/STAKey announcement" },
    {  WAI_SUB_MULTICAST_ANNOUNCE_RESP, "Multicast key/STAKey announcement response" },
    { 0, NULL }
};
static value_string_ext wai_subtype_names_ext = VALUE_STRING_EXT_INIT(wai_subtype_names);

static const true_false_string wai_bk_rekeying_flag = {
    "Packet is a BK rekeying packet",
    "Packet is not a BK rekeying packet"
};

static const true_false_string wai_preauthentication_flag = {
    "Packet is a pre-authentication packet",
    "Packet is not a pre-authentication packet"
};

static const true_false_string  wai_certificate_flag = {
    "STA requires to verify the peers certificate",
    "STA doesn't require to verify the peers certificate"
};

static const true_false_string  wai_optional_flag = {
    "There are some optional fields in packet",
    "No optional fields in packet"
};

static const true_false_string  wai_usk_rekeying_flag = {
    "Packet is a USK rekeying packet",
    "Packet is not a USK rekeying packet"
};

static const true_false_string  wai_negotiation_flag = {
    "Packet is a STAKey negotiation packet",
    "Packet is not a STAKey negotiation packet"
};

static const true_false_string  wai_revoking_flag = {
    "STA delete a STAKey",
    "STA doesn't delete a STAKey"
};

static const true_false_string  wai_reserved_flag = {
    "reserved 1",
    "reserved 0"
};

static void
dissect_flag(tvbuff_t *tvb, guint offset, proto_tree *tree)
{
    proto_item *flag_item;
    proto_tree *flag_tree;

    flag_item = proto_tree_add_item(tree, hf_wai_flag, tvb, offset, 1, ENC_BIG_ENDIAN);
    flag_tree = proto_item_add_subtree (flag_item, ett_wai_flags);

    proto_tree_add_item (flag_tree, hf_wai_bk_rekeying_flag,       tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item (flag_tree, hf_wai_preauthentication_flag, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item (flag_tree, hf_wai_certificate_flag,       tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item (flag_tree, hf_wai_optional_flag,          tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item (flag_tree, hf_wai_usk_rekeying_flag,      tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item (flag_tree, hf_wai_negotiation_flag,       tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item (flag_tree, hf_wai_revoking_flag,          tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item (flag_tree, hf_wai_reserved_flag,          tvb, offset, 1, ENC_BIG_ENDIAN);
}

inline static void
dissect_bkid(tvbuff_t *tvb, guint offset, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_wai_bkid, tvb, offset, 16, ENC_NA);
}

inline static void
dissect_uskid(tvbuff_t *tvb, guint offset, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_wai_uskid, tvb, offset, 1, ENC_NA);
}

inline static void dissect_wie(tvbuff_t *tvb, guint offset, guint length, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_wai_wie, tvb, offset, length, ENC_NA);
}

inline static void
dissect_message_auth_code(tvbuff_t *tvb, guint offset, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_wai_message_auth_code, tvb, offset, 20, ENC_NA);
}

inline static void
dissect_mskid(tvbuff_t *tvb, guint offset, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_wai_mskid, tvb, offset, 1, ENC_NA);
}

inline static void
dissect_key_announcement_identifier(tvbuff_t *tvb, guint offset, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_wai_key_ann_id, tvb, offset, 16, ENC_NA);
}

inline static void
dissect_counter(tvbuff_t *tvb, guint offset, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_wai_counter, tvb, offset, 16, ENC_NA);
}

inline static void
dissect_authentication_id(tvbuff_t *tvb, guint offset, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_wai_auth_id, tvb, offset, 32, ENC_NA);
}

static void
dissect_addid(tvbuff_t *tvb, guint offset, proto_tree *tree)
{
    proto_item *mac_item;
    proto_tree *mac_tree;

    mac_item = proto_tree_add_string(tree, hf_wai_addid, tvb, offset, 12, "AE MAC and ASUE MAC addresses");

    mac_tree = proto_item_add_subtree(mac_item, ett_wai_mac);
    proto_tree_add_item(mac_tree, hf_wai_ae_mac,   tvb, offset,   6, ENC_NA);
    proto_tree_add_item(mac_tree, hf_wai_asue_mac, tvb, offset+6, 6, ENC_NA);
}

static guint16
dissect_identity(tvbuff_t * tvb, const guint16 offset, proto_tree * tree,
   const char * const label)
{
    proto_tree *id_tree;
    proto_item *id_item;
    guint16     length;

    length = tvb_get_ntohs(tvb, offset+2);

    id_item = proto_tree_add_item(tree, hf_wai_identity, tvb, offset, length+4, ENC_NA);
    id_tree = proto_item_add_subtree(id_item, ett_wai_identity);
    proto_item_set_text(id_item, "%sIdentity", ((label==NULL)?"":label));
    proto_tree_add_item(id_tree, hf_wai_identity_id,   tvb, offset,   2, ENC_BIG_ENDIAN);
    proto_tree_add_item(id_tree, hf_wai_identity_len,  tvb, offset+2, 2, ENC_BIG_ENDIAN);
    proto_tree_add_item(id_tree, hf_wai_identity_data, tvb, offset+4, length, ENC_NA);

    return length + 4;
}

static gint16
dissect_certificate(tvbuff_t * tvb, const gint offset, proto_tree * tree,
                    const gchar * const label)
{
    proto_item  *certificate_item;
    proto_tree  *certificate_tree;
    proto_item  *id_item;
    guint16      length;
    guint16      id;
    const gchar *id_name = "unknown";

    id = tvb_get_ntohs(tvb, offset);

    if (id == 1) {
        id_name = "X.509 v3";
    } else if (id == 2){
        id_name = "GBW";
    }

    length = tvb_get_ntohs(tvb, offset+2);

    certificate_item = proto_tree_add_item(tree, hf_wai_cert, tvb, offset, length+4, ENC_NA);
    proto_item_set_text(certificate_item, "%sCertificate",  ((label==NULL)?"":label));
    certificate_tree = proto_item_add_subtree(certificate_item, ett_wai_certificate);

    id_item = proto_tree_add_item(certificate_tree, hf_wai_cert_id, tvb, offset, 2, ENC_BIG_ENDIAN);
    proto_item_set_text(id_item, "Certificate Identifier: %s (%#x)", id_name, id);
    proto_tree_add_item(certificate_tree, hf_wai_cert_len,  tvb, offset+2, 2, ENC_BIG_ENDIAN);
    proto_tree_add_item(certificate_tree, hf_wai_cert_data, tvb, offset+4, length, ENC_NA);

    return length + 4;
}

static guint16
dissect_ecdh_parameter(tvbuff_t * tvb, const gint offset, proto_tree * tree)
{
    proto_item  *ecdh_item;
    proto_tree  *ecdh_tree;
    proto_item  *ecdh_id_item;
    guint8       ecdh_id;
    guint16      ecdh_len;
    const gchar *id_name = "unknown";

    ecdh_id = tvb_get_guint8(tvb, offset);

    if (ecdh_id == 1) {
        id_name = "OID";
    } else if (ecdh_id == 2) {
        id_name = "Detailed parameter";
    }

    ecdh_len = tvb_get_ntohs(tvb, offset+1);

    ecdh_item = proto_tree_add_item(tree, hf_wai_ecdh,  tvb, offset, ecdh_len+3, ENC_NA);
    ecdh_tree = proto_item_add_subtree(ecdh_item, ett_wai_ecdh_param);
    ecdh_id_item = proto_tree_add_item(ecdh_tree, hf_wai_ecdh_id, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_item_set_text(ecdh_id_item, "ID: %s (%#x)", id_name, ecdh_id);
    proto_tree_add_item(ecdh_tree, hf_wai_ecdh_len,     tvb, offset+1, 2, ENC_BIG_ENDIAN);
    proto_tree_add_item(ecdh_tree, hf_wai_ecdh_content, tvb, offset+3, ecdh_len, ENC_NA);

    return ecdh_len + 3;
}

static guint16
dissect_challenge(tvbuff_t *tvb, guint offset, proto_tree *tree, const gchar * const label)
{
    proto_item    *challenge_item;
    const guint16  challenge_length = 32;

    challenge_item = proto_tree_add_item(tree, hf_wai_challenge, tvb, offset, 32, ENC_NA);
    proto_item_append_text(challenge_item, "(%schallenge)",  ((label==NULL)?"":label));

    return challenge_length;
}

static guint16
dissect_key_data(tvbuff_t *tvb, guint offset, proto_tree *tree, const gchar *const label)
{
    proto_item  *key_data_item;
    proto_tree  *key_data_tree;
    guint8      length;

    length = tvb_get_guint8(tvb, offset);

    key_data_item = proto_tree_add_item(tree, hf_wai_key_data, tvb, offset, length+1, ENC_NA);
    proto_item_set_text(key_data_item, "%sKey Data", ((label==NULL)?"":label));
    key_data_tree = proto_item_add_subtree(key_data_item, ett_wai_key_data);
    proto_tree_add_item(key_data_tree, hf_wai_key_data_len, tvb, offset, 1, ENC_BIG_ENDIAN);

    if (length > 0) {
        proto_tree_add_item(key_data_tree, hf_wai_key_data_content, tvb, offset+1, length, ENC_NA);
    }

    return length + 1;
}

static guint
dissect_multiple_certificate(tvbuff_t * tvb, guint offset, proto_tree *tree)
{
    proto_item *multicert_item;
    proto_tree *multicert_tree;
    proto_item *nonce_1_item;
    proto_item *nonce_2_item;
    guint       length;

    length = tvb_get_ntohs(tvb, offset+1);
    multicert_item = proto_tree_add_item(tree, hf_wai_cert_ver, tvb, offset, length+3, ENC_NA);
    multicert_tree = proto_item_add_subtree(multicert_item, ett_wai_certificate_verification);
    proto_tree_add_item(multicert_tree, hf_wai_attr_type, tvb, offset, 1, ENC_BIG_ENDIAN);
    offset += 1;
    proto_tree_add_item(multicert_tree, hf_wai_length, tvb, offset, 2, ENC_BIG_ENDIAN);
    offset += 2;
    nonce_1_item = proto_tree_add_item(multicert_tree, hf_wai_nonce, tvb, offset, 32, ENC_NA);
    offset += 32;
    proto_item_append_text(nonce_1_item, " 1");
    nonce_2_item = proto_tree_add_item(multicert_tree, hf_wai_nonce, tvb, offset, 32, ENC_NA);
    offset += 32;
    proto_item_append_text(nonce_2_item, " 2");
    proto_tree_add_item(multicert_tree, hf_wai_ver_res, tvb, offset, 1, ENC_BIG_ENDIAN);
    offset += 1;
    offset += dissect_certificate(tvb, offset, multicert_tree, "1 ");
    proto_tree_add_item(multicert_tree, hf_wai_ver_res, tvb, offset, 1, ENC_BIG_ENDIAN);
    offset += 1;
    dissect_certificate(tvb, offset, multicert_tree, "2 ");

    return length + 3;
}

static guint
dissect_identity_list(tvbuff_t *tvb, guint offset, proto_tree *tree)
{
    proto_item *id_list_item;
    proto_tree *id_list_tree;
    guint16     length;
    guint16     no_of_ids;
    guint16     i;

    length = tvb_get_ntohs(tvb, offset+1);
    id_list_item = proto_tree_add_item(tree, hf_wai_identity_list, tvb, offset, length+3, ENC_NA);
    id_list_tree = proto_item_add_subtree(id_list_item, ett_wai_identity_list);
    proto_tree_add_item(id_list_tree, hf_wai_attr_type, tvb, offset, 1, ENC_BIG_ENDIAN);
    offset += 1;
    proto_tree_add_item(id_list_tree, hf_wai_length, tvb, offset, 2, ENC_BIG_ENDIAN);
    offset += 2;
    proto_tree_add_item(id_list_tree, hf_wai_reserved_byte, tvb, offset, 1, ENC_BIG_ENDIAN);
    offset += 1;
    proto_tree_add_item(id_list_tree, hf_wai_no_of_ids, tvb, offset, 2, ENC_BIG_ENDIAN);
    no_of_ids = tvb_get_ntohs(tvb, offset);
    offset += 2;

    for(i=0; i < no_of_ids; i++) {
        gchar number[4] = {0};

        snprintf(number, 4, "%d", i);
        offset += dissect_identity(tvb, offset, id_list_tree, number);
    }

    return length + 3;
}

static guint16
dissect_signature_algorithm(tvbuff_t *tvb, guint offset, proto_tree *tree)
{
    proto_item *sa_item;
    proto_tree *sa_tree;
    proto_item *param_item;
    proto_tree *param_tree;
    proto_item *alg_name_item;
    proto_item *sig_name_item;
    guint16     length;
    guint8      alg_id;
    guint8      sig_id;
    guint16     param_len;

    length  = tvb_get_ntohs(tvb, offset);

    sa_item = proto_tree_add_item(tree, hf_wai_sign_alg, tvb, offset,  length+2, ENC_NA);
    sa_tree = proto_item_add_subtree(sa_item, ett_wai_sign_alg);

    proto_tree_add_item(sa_tree, hf_wai_length, tvb, offset, 2, ENC_BIG_ENDIAN);
    offset += 2;

    alg_name_item = proto_tree_add_item(sa_tree, hf_wai_hash_alg_id, tvb, offset, 1, ENC_BIG_ENDIAN);
    alg_id = tvb_get_guint8(tvb, offset);

    if (1 == alg_id) {
        proto_item_set_text(alg_name_item, "Algorithm Identifier: SHA-256  (0x01)");
    }

    offset += 1;
    sig_name_item = proto_tree_add_item(sa_tree, hf_wai_sign_alg_id, tvb, offset, 1, ENC_BIG_ENDIAN);
    sig_id = tvb_get_guint8(tvb, offset);

    if (1 == sig_id) {
        proto_item_set_text(sig_name_item, "Signature Algorithm Identifier: ECDSA-192  (0x01)");
    }

    offset += 1;
    param_len  = tvb_get_ntohs(tvb, offset+1);
    param_item = proto_tree_add_item(sa_tree, hf_wai_param, tvb, offset,  param_len+3, ENC_NA);
    param_tree = proto_item_add_subtree(param_item, ett_wai_parameter);
    proto_tree_add_item(param_tree, hf_wai_param_id, tvb, offset, 1, ENC_NA);
    offset += 1;
    proto_tree_add_item(param_tree, hf_wai_length, tvb, offset, 2, ENC_BIG_ENDIAN);
    offset += 2;
    proto_tree_add_item(param_tree, hf_wai_param_content, tvb, offset, param_len, ENC_NA);

    return length + 2;
}

static guint16
dissect_signature_value(tvbuff_t *tvb, guint offset, proto_tree *tree)
{
    proto_item *sv_item;
    proto_tree *sv_tree;
    guint16     length = 0;

    length  = tvb_get_ntohs(tvb, offset);

    sv_item = proto_tree_add_item(tree, hf_wai_sign_val, tvb, offset,  length+2, ENC_NA);
    sv_tree = proto_item_add_subtree(sv_item, ett_wai_sign_val);

    proto_tree_add_item(sv_tree, hf_wai_length, tvb, offset, 2, ENC_BIG_ENDIAN);
    offset += 2;

    proto_tree_add_item(sv_tree, hf_wai_sign_content, tvb, offset, length, ENC_NA);

    return length + 2;
}

static guint16
dissect_signature(tvbuff_t *tvb, guint offset, proto_tree *tree, const gchar *const label)
{
    proto_item *ss_item;
    proto_tree *ss_tree;
    guint       length = 0;

    length  = tvb_get_ntohs(tvb, offset+1);

    ss_item = proto_tree_add_item(tree, hf_wai_sign, tvb, offset, length+3, ENC_NA);
    proto_item_set_text(ss_item, "%s", (label==NULL)?"Signature":label);
    ss_tree = proto_item_add_subtree(ss_item, ett_wai_sign);

    proto_tree_add_item(ss_tree, hf_wai_attr_type, tvb, offset, 1, ENC_BIG_ENDIAN);
    offset += 1;

    proto_tree_add_item(ss_tree, hf_wai_length, tvb, offset, 2, ENC_BIG_ENDIAN);
    offset += 2;

    offset += dissect_identity(tvb, offset, ss_tree, NULL);
    offset += dissect_signature_algorithm(tvb, offset, ss_tree);
    dissect_signature_value(tvb, offset, ss_tree);

    return length + 3;
}


static void
dissect_wai_data(tvbuff_t *tvb, proto_tree *tree, guint8 subtype, guint16 lenx)
{
    proto_item  *data_item;
    proto_tree  *data_tree;
    const gchar *type_name;

    data_item = proto_tree_add_item(tree, hf_wai_data, tvb, 0, lenx, ENC_NA);
    data_tree = proto_item_add_subtree (data_item, ett_wai_data);

    type_name = val_to_str_ext_const(subtype, &wai_subtype_names_ext, "Unknown type");

    proto_item_set_text(data_item, "%s data (%d bytes)", type_name, lenx);

    switch (subtype) {
        case WAI_SUB_PRE_AUTHENTICATION:
        {
            /* Chapter 8.1.4.6 Preauthentication [ref: 1] */
            dissect_flag(tvb, 0, data_tree);
            dissect_uskid(tvb, 1, data_tree);
            dissect_addid(tvb, 2, data_tree);
            dissect_counter(tvb, 14, data_tree);
            dissect_message_auth_code(tvb, 30, data_tree);
            break;
        }
        case WAI_SUB_STAKEY_REQ:
        {
            /* Chapter 8.1.4.5 STAKey Establishment procedure [ref: 1] */
            dissect_flag(tvb, 0, data_tree);
            proto_tree_add_item(data_tree, hf_wai_sta_key_id, tvb, 1, 1, ENC_BIG_ENDIAN);
            dissect_uskid(tvb, 2, data_tree);
            dissect_addid(tvb, 3, data_tree);
            dissect_counter(tvb, 15, data_tree);
            dissect_message_auth_code(tvb, 31, data_tree);
            break;
        }
        case WAI_SUB_AUTH_ACTIVATION:
        {
            /* Chapter 8.1.4.2.1 WAI Authentication Activation  [ref: 1] */
            guint16 offset = 0;

            dissect_flag(tvb, offset, data_tree);
            offset += 1;
            dissect_authentication_id(tvb, offset, data_tree);
            offset += 32;
            offset += dissect_identity(tvb, offset, data_tree, "Local ASU ");
            offset += dissect_certificate(tvb, offset, data_tree, "STE AE ");
            dissect_ecdh_parameter(tvb, offset, data_tree);
            break;
        }
        case WAI_SUB_ACCESS_AUTH_REQ:
        {
            /* Chapter 8.1.4.2.2 Access WAI Authentication Request  [ref: 1] */
            guint16 offset = 0;
            guint8  optional_field;

            optional_field = tvb_get_guint8(tvb, 0) & FLAG_BIT3;

            dissect_flag(tvb, offset, data_tree);
            offset += 1;
            dissect_authentication_id(tvb, offset, data_tree);
            offset += 32;
            offset += dissect_challenge(tvb, offset, data_tree, "ASUE ");
            offset += dissect_key_data(tvb, offset, data_tree, "ASUE ");
            offset += dissect_identity(tvb, offset, data_tree, "STA AE ");
            offset += dissect_certificate(tvb, offset, data_tree, "STA ASUE ");
            offset += dissect_ecdh_parameter(tvb, offset, data_tree);

            if (optional_field) {
                offset += dissect_identity_list(tvb, offset, data_tree);
            }

            dissect_signature(tvb, offset, data_tree, "ASUE Signature");
            break;
        }
        case WAI_SUB_ACCESS_AUTH_RESP:
        {
            /* Chapter 8.1.4.2.5 Access WAI Authentication Response  [ref: 1] */
            guint16 offset = 0;
            guint8  optional_field;

            optional_field = tvb_get_guint8(tvb, 0) & FLAG_BIT3;

            dissect_flag(tvb, offset, data_tree);
            offset += 1;
            offset += dissect_challenge(tvb, offset, data_tree, "ASUE ");
            offset += dissect_challenge(tvb, offset, data_tree, "AE ");
            proto_tree_add_item(data_tree, hf_wai_access_res, tvb, offset, 1, ENC_BIG_ENDIAN);
            offset += 1;
            offset += dissect_key_data(tvb, offset, data_tree, "ASUE ");
            offset += dissect_key_data(tvb, offset, data_tree, "AE ");
            offset += dissect_identity(tvb, offset, data_tree, "STA AE ");
            offset += dissect_identity(tvb, offset, data_tree, "STA ASUE ");

            if (optional_field) {
                guint  length = 0;
                offset += dissect_multiple_certificate(tvb, offset, data_tree);
                offset += dissect_signature(tvb, offset, data_tree, "Server Signature trusted by ASUE");
                length  = tvb_get_ntohs(tvb, offset+1);
                if (length + 3 + offset + 1 < lenx)
                    offset += dissect_signature(tvb, offset, data_tree, "Server Signature trusted by AE");
            }

            dissect_signature(tvb, offset, data_tree, "AE Signature");
            break;
        }
        case WAI_SUB_CERT_AUTH_REQ:
        {
            /* Chapter 8.1.4.2.3 Certificate Authentication Request  [ref: 1] */
            guint16 offset = 0;
            guint8  optional_field;

            optional_field = tvb_get_guint8(tvb, 0) & FLAG_BIT3;

            dissect_addid(tvb, offset, data_tree);
            offset += 12;
            offset += dissect_challenge(tvb, offset, data_tree, "AE ");
            offset += dissect_challenge(tvb, offset, data_tree, "ASUE ");
            offset += dissect_certificate(tvb, offset, data_tree, "STE ASUE ");
            offset += dissect_certificate(tvb, offset, data_tree, "STE AE ");
            if (optional_field) {
                dissect_identity_list(tvb, offset, data_tree);
            }
            break;
        }
        case WAI_SUB_CERT_AUTH_RESP:
        {
            /* Chapter 8.1.4.2.4 Certificate Authentication Response  [ref: 1] */
            guint16 offset = 0;

            dissect_addid(tvb, offset, data_tree);
            offset += 12;
            offset += dissect_multiple_certificate(tvb, offset, data_tree);
            offset += dissect_signature(tvb, offset, data_tree, "Server Signature trusted by ASUE");
            if (offset < lenx)
                dissect_signature(tvb, offset, data_tree, "Server Signature trusted by AE");
            break;
        }
        case WAI_SUB_UNICAST_KEY_REQ:
        {
            /* Chapter 8.1.4.3.1 Unicast Key Negotiation Request [ref: 1] */
            dissect_flag(tvb, 0, data_tree);
            dissect_bkid(tvb, 1, data_tree);
            dissect_uskid(tvb, 17, data_tree);
            dissect_addid(tvb, 18, data_tree);
            dissect_challenge(tvb, 30, data_tree , "AE ");
            break;
        }
        case WAI_SUB_UNICAST_KEY_RESP:
        {
            /* Chapter 8.1.4.3.2 Unicast Key Negotiation Response [ref: 1] */
            tvbuff_t *next_tvb;
            guint     length = 0;

            dissect_flag(tvb, 0, data_tree);
            dissect_bkid(tvb, 1, data_tree);
            dissect_uskid(tvb, 17, data_tree);
            dissect_addid(tvb, 18, data_tree);
            dissect_challenge(tvb, 30, data_tree, "ASUE ");
            dissect_challenge(tvb, 62, data_tree, "AE ");

            next_tvb = tvb_new_subset_remaining(tvb, 96);
            length = tvb_reported_length(next_tvb);

            dissect_wie(next_tvb, 0, length-20, data_tree);
            dissect_message_auth_code(next_tvb, length-20, data_tree);
            break;
        }
        case WAI_SUB_UNICAST_KEY_CONFIRM:
        {
            /* Chapter 8.1.4.3.3 Unicast Key Negotiation Confirmation [ref: 1] */
            tvbuff_t *next_tvb;
            guint     length = 0;

            dissect_flag(tvb, 0, data_tree);
            dissect_bkid(tvb, 1, data_tree);
            dissect_uskid(tvb, 17, data_tree);
            dissect_addid(tvb, 18, data_tree);
            dissect_challenge(tvb, 30, data_tree, "ASUE ");

            next_tvb = tvb_new_subset_remaining(tvb, 62);
            length = tvb_reported_length(next_tvb);

            dissect_wie(next_tvb, 0, length-20, data_tree);
            dissect_message_auth_code(next_tvb, length-20, data_tree);
            break;
        }
        case WAI_SUB_MULTICAST_ANNOUNCE:
        {
            /* Chapter 8.1.4.4.1 Multicast Key/STAKey Announcement [ref: 1] */
            guint16 offset = 0;

            dissect_flag(tvb, offset, data_tree);
            offset += 1;
            dissect_mskid(tvb, offset, data_tree);
            offset += 1;
            dissect_uskid(tvb, offset, data_tree);
            offset += 1;
            dissect_addid(tvb, offset, data_tree);
            offset += 12;
            proto_tree_add_item(data_tree, hf_wai_data_pack_num, tvb, offset, 16, ENC_NA);
            offset += 16;
            dissect_key_announcement_identifier(tvb, offset, data_tree);
            offset += 16;
            offset += dissect_key_data(tvb, offset, data_tree, NULL);
            dissect_message_auth_code(tvb, offset, data_tree);
            break;
        }
        case WAI_SUB_MULTICAST_ANNOUNCE_RESP:
        {
            /* Chapter 8.1.4.4.2 Multicast Key/STAKey Announcement Response [ref: 1] */
            dissect_flag(tvb,  0, data_tree);
            dissect_mskid(tvb, 1, data_tree);
            dissect_uskid(tvb, 2, data_tree);
            dissect_addid(tvb, 3, data_tree);
            dissect_key_announcement_identifier(tvb, 15, data_tree);
            dissect_message_auth_code(tvb, 31, data_tree);
            break;
        }
        default:
            break;
    }
}

static int
dissect_wai(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
/* Format of WAPI protocol packet in WAI authentication system

0      2      3         4         6         8        10        11      12
-------------------------------------------------------------------------------
| Ver. | Type | Subtype | Reserved | Length | packet  |  fragm. | flag | data |
|                                           | seq. no | seq. no |             |
|-----------------------------------------------------------------------------|
Figure 18 from [ref:1]
*/
#define WAI_MESSAGE_LENGTH 12   /*Length of all fields without 'Data' field*/
#define WAI_DATA_OFFSET    WAI_MESSAGE_LENGTH
    guint16        version;
    guint8         subtype;
    guint16        length;
    guint16        packet_num;
    guint8         fragment_num;
    guint8         flags;
    fragment_head *frag_msg;
    proto_tree    *wai_tree     = NULL;
    tvbuff_t      *next_tvb;
    tvbuff_t      *new_tvb;
    const gchar   *subtype_name = "Unknown type";

    length = tvb_get_ntohs(tvb, 6)-WAI_MESSAGE_LENGTH;
    subtype = tvb_get_guint8(tvb, 3);

    /* quick sanity check */
    if ((length != tvb_reported_length (tvb)-WAI_MESSAGE_LENGTH) ||
        (subtype > WAI_SUB_MULTICAST_ANNOUNCE_RESP)) {
        return 0;
    }

    col_set_str(pinfo->cinfo, COL_PROTOCOL, "WAI");
    col_clear(pinfo->cinfo, COL_INFO);
    version = tvb_get_ntohs(tvb, 0);

    if (version == 1) {
        subtype_name = val_to_str_ext_const(subtype, &wai_subtype_names_ext, "Unknown type");
    }
    col_append_str(pinfo->cinfo, COL_INFO, subtype_name);

    /* Field lengths and offsets in WAI protocol described above */
    packet_num   = tvb_get_ntohs(tvb, 8);
    fragment_num = tvb_get_guint8(tvb, 10);
    flags        = tvb_get_guint8(tvb, 11);

    if (tree) {
        proto_item *wai_item;

        wai_item = proto_tree_add_item(tree, proto_wai, tvb, 0, -1, ENC_NA);

        proto_item_set_text (wai_item, "WAI Protocol (%s)",
                                val_to_str_ext_const(subtype, &wai_subtype_names_ext, "Unknown type"));
        wai_tree = proto_item_add_subtree(wai_item, ett_wai);

        /* Field lengths and offsets in WAI protocol described above */
        proto_tree_add_item(wai_tree, hf_wai_version,   tvb, 0,  2, ENC_BIG_ENDIAN);
        proto_tree_add_item(wai_tree, hf_wai_type,      tvb, 2,  1, ENC_BIG_ENDIAN);
        proto_tree_add_item(wai_tree, hf_wai_subtype,   tvb, 3,  1, ENC_BIG_ENDIAN);
        proto_tree_add_item(wai_tree, hf_wai_reserved,  tvb, 4,  2, ENC_BIG_ENDIAN);
        proto_tree_add_item(wai_tree, hf_wai_length,    tvb, 6,  2, ENC_BIG_ENDIAN);
        proto_tree_add_item(wai_tree, hf_wai_seq,       tvb, 8,  2, ENC_BIG_ENDIAN);
        proto_tree_add_item(wai_tree, hf_wai_fragm_seq, tvb, 10, 1, ENC_BIG_ENDIAN);
        proto_tree_add_item(wai_tree, hf_wai_flag,      tvb, 11, 1, ENC_BIG_ENDIAN);
    }

    frag_msg =  fragment_add_seq_check (&wai_reassembly_table,
                                        tvb, WAI_DATA_OFFSET,
                                        pinfo,
                                        packet_num,
                                        NULL,
                                        fragment_num,
                                        length,
                                        flags);

    next_tvb = tvb_new_subset_remaining(tvb, WAI_DATA_OFFSET);

    /* Replace INFO column if message is fragmented and call data dissector */
    if (flags) {
        col_add_fstr(pinfo->cinfo, COL_INFO,
                     "Fragment (%d) of message, data not dissected", fragment_num);

        process_reassembled_data(tvb, WAI_DATA_OFFSET, pinfo,
                                 "Reassembled WAI", frag_msg, &wai_frag_items,
                                 NULL, wai_tree);

        call_data_dissector(next_tvb, pinfo, tree);
    } else {
        /* If this is the last fragment of fragmented message, then reassamble and dissect
           otherwise only dissect */
        if (fragment_num > 0) {
            new_tvb = process_reassembled_data(tvb, WAI_DATA_OFFSET, pinfo,
                                               "Reassembled WAI", frag_msg, &wai_frag_items,
                                               NULL, wai_tree);

            if (new_tvb) {
                col_set_str(pinfo->cinfo, COL_INFO, "Last fragment of message, data dissected");
                col_append_sep_str(pinfo->cinfo, COL_INFO, ": ", subtype_name);
                next_tvb=new_tvb;
                length = tvb_reported_length (next_tvb);
            }
        }
        /* dissect Data field of WAI packet */
        if (tree) {
            dissect_wai_data(next_tvb, wai_tree, subtype, length);
        }
    }

    return tvb_captured_length(tvb);
}

void
proto_register_wai(void)
{
    static hf_register_info hf[] = {
        { &hf_wai_version,
          { "Version", "wai.version",
            FT_UINT16, BASE_DEC, NULL, 0x0,
            "Version of authentication infrastructure", HFILL }},

        { &hf_wai_type,
          { "Type", "wai.type",
            FT_UINT8, BASE_HEX, VALS(wai_type_names), 0x0,
            "Protocol type", HFILL }},

        { &hf_wai_subtype,
          { "Subtype", "wai.subtype",
            FT_UINT8, BASE_DEC|BASE_EXT_STRING, &wai_subtype_names_ext, 0x0,
            NULL, HFILL }},

        { &hf_wai_reserved,
          { "Reserved", "wai.reserved",
            FT_UINT16, BASE_HEX, NULL, 0x0,
            NULL, HFILL }},

        { &hf_wai_length,
          { "Length", "wai.length",
            FT_UINT16, BASE_DEC, NULL, 0x0,
            NULL, HFILL }},

        { &hf_wai_seq,
          { "Sequence number", "wai.seq",
            FT_UINT16, BASE_DEC, NULL, 0x0,
            "Packet sequence number", HFILL }},

        { &hf_wai_fragm_seq,
          { "Fragment sequence number", "wai.fragm.seq",
            FT_UINT8, BASE_DEC, NULL, 0x0,
            NULL, HFILL }},

        { &hf_wai_flag,
          { "Flag", "wai.flag",
            FT_UINT8, BASE_HEX, NULL, 0x0,
            NULL, HFILL }},

        { &hf_wai_data,
          { "Data", "wai.data",
            FT_BYTES, BASE_NONE, NULL, 0x0,
            NULL, HFILL }},

        { &hf_wai_bk_rekeying_flag,
          {"BK rekeying", "wai.bk.rekeying.flag",
           FT_BOOLEAN, 8, TFS (&wai_bk_rekeying_flag), FLAG_BIT0,
           "BK rekeying flag", HFILL }},

        { &hf_wai_preauthentication_flag,
          {"Pre-Authentication", "wai.preauthentication.flag",
           FT_BOOLEAN, 8, TFS (&wai_preauthentication_flag), FLAG_BIT1,
           "Pre-Authentication flag", HFILL }},

        { &hf_wai_certificate_flag,
          {"Certificate", "wai.certificate.flag",
           FT_BOOLEAN, 8, TFS (&wai_certificate_flag), FLAG_BIT2,
           "Certificate flag", HFILL }},

        { &hf_wai_optional_flag,
          {"Optional", "wai.optional.flag",
           FT_BOOLEAN, 8, TFS (&wai_optional_flag), FLAG_BIT3,
           "Optional flag", HFILL }},

        { &hf_wai_usk_rekeying_flag,
            {"USK rekeying", "wai.usk.rekeying.flag",
                    FT_BOOLEAN, 8, TFS (&wai_usk_rekeying_flag), FLAG_BIT4,
                    "USK rekeying flag", HFILL }},

        { &hf_wai_negotiation_flag,
            {"STA negotiation", "wai.negotiation.flag",
                    FT_BOOLEAN, 8, TFS (&wai_negotiation_flag), FLAG_BIT5,
                    "STA negotiation flag", HFILL }},

        { &hf_wai_revoking_flag,
            {"STA revoking", "wai.revoking.flag",
                    FT_BOOLEAN, 8, TFS (&wai_revoking_flag), FLAG_BIT6,
                    "STA revoking flag", HFILL }},

        { &hf_wai_reserved_flag,
            {"Reserved", "wai.reserved.flag",
                    FT_BOOLEAN, 8, TFS (&wai_reserved_flag), FLAG_BIT7,
                    "Reserved flag", HFILL }},

        { &hf_wai_attr_type,
          { "Type", "wai.attrtype",
            FT_UINT8, BASE_HEX, VALS(wai_attr_type_names), 0x0,
            "Attribute type", HFILL }},

        { &hf_wai_cert,
            {"Certificate", "wai.cert",
                    FT_BYTES, BASE_NONE, NULL, 0x0,
             NULL, HFILL }},

        { &hf_wai_cert_id,
          {"Id", "wai.cert.id",
           FT_UINT16, BASE_HEX, NULL, 0x0,
           "Certificate Id", HFILL }},

        { &hf_wai_cert_data,
          {"Data", "wai.cert.data",
           FT_BYTES, BASE_NONE, NULL, 0x0,
           "Certificate data", HFILL }},

        { &hf_wai_cert_len,
          {"Length", "wai.cert.len",
           FT_UINT16, BASE_DEC, NULL, 0x0,
           "Certificate length", HFILL }},

        { &hf_wai_addid,
          {"ADDID", "wai.addid",
           FT_STRING, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_ae_mac,
          {"AE MAC", "wai.ae.mac",
           FT_ETHER, BASE_NONE, NULL, 0x0,
           "AE MAC address", HFILL }},

        { &hf_wai_asue_mac,
          {"ASUE MAC", "wai.asue.mac",
           FT_ETHER, BASE_NONE, NULL, 0x0,
           "ASUE MAC address", HFILL }},

        { &hf_wai_bkid,
          {"BKID", "wai.bkid",
           FT_BYTES, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_uskid,
          {"USKID", "wai.uskid",
           FT_BYTES, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_wie,
          {"WIE from ASUE", "wai.wie",
           FT_BYTES, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_message_auth_code,
          {"Message Authentication Code", "wai.message.auth.code",
           FT_BYTES, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_mskid,
          {"MSKID/STAKeyID", "wai.mskid",
           FT_BYTES, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_data_pack_num,
          {"Data packet number", "wai.data.packet.num",
           FT_BYTES, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_key_data,
          {"Key Data", "wai.key.data",
           FT_BYTES, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_key_data_len,
          {"Length", "wai.key.data.len",
           FT_UINT8, BASE_DEC, NULL, 0x0,
           "Key data length", HFILL }},

        { &hf_wai_key_data_content,
          {"Content", "wai.key.data.content",
           FT_BYTES, BASE_NONE, NULL, 0x0,
           "Key data content", HFILL }},

        { &hf_wai_key_ann_id,
          {"Key Announcement Identifier", "wai.key.ann.id",
           FT_BYTES, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_auth_id,
          {"Authentication Identifier", "wai.auth.id",
           FT_BYTES, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_identity,
          {"Identifier", "wai.identity",
           FT_BYTES, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_identity_id,
          {"Id", "wai.identity.id",
           FT_UINT16, BASE_HEX, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_identity_len,
          {"Length", "wai.identity.len",
           FT_UINT16, BASE_DEC, NULL, 0x0,
           "Identity length", HFILL }},

        { &hf_wai_identity_data,
          {"Data", "wai.identity.data",
           FT_BYTES, BASE_NONE, NULL, 0x0,
           "Identity data", HFILL }},

        { &hf_wai_ecdh,
          {"ECDH Parameter", "wai.ecdhp",
           FT_BYTES, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_ecdh_id,
          {"ID", "wai.edch.id",
           FT_UINT8, BASE_HEX, NULL, 0x0,
           "ECDH Parameter Identifier", HFILL }},

        { &hf_wai_ecdh_len,
          {"Length", "wai.ecdh.len",
           FT_UINT16, BASE_DEC, NULL, 0x0,
           "ECDH Parameter Length", HFILL }},

        { &hf_wai_ecdh_content,
          {"Content", "wai.ecdh.content",
           FT_BYTES, BASE_NONE, NULL, 0x0,
           "ECDH Parameter Content", HFILL }},

        { &hf_wai_counter,
          {"Replay counter", "wai.counter",
           FT_BYTES, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_sta_key_id,
          {"STAKeyID", "wai.sta.key.id",
           FT_UINT8, BASE_HEX, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_challenge,
          {"Challenge", "wai.challenge",
           FT_BYTES, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_cert_ver,
          {"Multiple Certificate Verification Result", "wai.cert.ver",
           FT_BYTES, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_nonce,
          {"Nonce", "wai.nonce",
           FT_BYTES, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_ver_res,
          {"Verification result", "wai.ver.res",
           FT_UINT8, BASE_HEX, VALS(wai_ver_res_names), 0x0,
           NULL, HFILL }},

        { &hf_wai_sign_alg,
          {"Signature Algorithm", "wai.sign.alg",
           FT_BYTES, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_hash_alg_id,
          {"Hash Algorithm Identifier", "wai.hash.alg.id",
           FT_UINT8, BASE_HEX, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_sign_alg_id,
          {"Signature Algorithm Identifier", "wai.sign.alg.id",
           FT_UINT8, BASE_HEX, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_param,
          {"Parameter", "wai.param",
           FT_BYTES, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_param_id,
          {"Parameter Identifier", "wai.param.id",
           FT_BYTES, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_param_content,
          {"Parameter Content", "wai.param.content",
           FT_BYTES, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_sign_val,
          {"Signature Value", "wai.sign.val",
           FT_BYTES, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_sign_content,
          {"Signature Content", "wai.sign.content",
           FT_BYTES, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_sign,
          {"Signature", "wai.sign",
           FT_BYTES, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_identity_list,
          {"ASU List trusted by ASUE", "wai.identity_list",
           FT_BYTES, BASE_NONE, NULL, 0x0,
           "Identity list", HFILL }},

        { &hf_wai_reserved_byte,
          {"Reserved", "wai.reserved.byte",
           FT_UINT8, BASE_HEX, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_no_of_ids,
          {"Number of Identities", "wai.no.of.ids",
           FT_UINT16, BASE_DEC, NULL, 0x0,
           NULL, HFILL }},

        { &hf_wai_access_res,
        {"Access result", "wai.access_result",
         FT_UINT8, BASE_HEX, VALS(wai_access_res_names), 0x0,
         NULL, HFILL }},

        { &hf_wai_fragments,
          {"Message fragments", "wai.fragments",
           FT_NONE, BASE_NONE, NULL, 0x00,
           NULL, HFILL }},

        { &hf_wai_fragment,
          {"Message fragment", "wai.fragment",
           FT_FRAMENUM, BASE_NONE, NULL, 0x00,
           NULL, HFILL }},

        { &hf_wai_fragment_overlap,
          {"Message fragment overlap", "wai.fragment.overlap",
           FT_BOOLEAN, BASE_NONE, NULL, 0x00,
           NULL, HFILL }},

        { &hf_wai_fragment_overlap_conflicts,
          {"Message fragment overlapping with conflicting data", "wai.fragment.overlap.conflicts",
           FT_BOOLEAN, BASE_NONE, NULL, 0x00,
           NULL, HFILL }},

        { &hf_wai_fragment_multiple_tails,
          {"Message has multiple tail fragments", "wai.fragment.multiple_tails",
           FT_BOOLEAN, BASE_NONE, NULL, 0x00,
           NULL, HFILL }},

        { &hf_wai_fragment_too_long_fragment,
          {"Message fragment too long", "wai.fragment.too_long_fragment",
           FT_BOOLEAN, BASE_NONE, NULL, 0x00,
           NULL, HFILL }},

        { &hf_wai_fragment_error,
          {"Message defragmentation error", "wai.fragment.error",
           FT_FRAMENUM, BASE_NONE, NULL, 0x00,
           NULL, HFILL }},

        { &hf_wai_fragment_count,
          {"Message fragment count", "wai.fragment.count",
           FT_UINT32, BASE_DEC, NULL, 0x00,
           NULL, HFILL }},

        { &hf_wai_reassembled_in,
          {"Reassembled in", "wai.reassembled.in",
           FT_FRAMENUM, BASE_NONE, NULL, 0x00,
           NULL, HFILL }},

        { &hf_wai_reassembled_length,
          {"Reassembled length", "wai.reassembled.length",
           FT_UINT32, BASE_DEC, NULL, 0x00,
           NULL, HFILL }}
    };

    static gint *ett[] = {
        &ett_wai,
        &ett_wai_data,
        &ett_wai_flags,
        &ett_wai_certificate,
        &ett_wai_mac,
        &ett_wai_identity,
        &ett_wai_key_data,
        &ett_wai_ecdh_param,
        &ett_wai_certificate_verification,
        &ett_wai_identity_list,
        &ett_wai_sign,
        &ett_wai_sign_alg,
        &ett_wai_sign_val,
        &ett_wai_parameter,
        &ett_wai_fragment,
        &ett_wai_fragments
    };

    proto_wai = proto_register_protocol("WAI Protocol", "WAI", "wai");
    proto_register_field_array(proto_wai, hf, array_length(hf));
    proto_register_subtree_array(ett, array_length(ett));
    reassembly_table_register(&wai_reassembly_table,
                          &addresses_reassembly_table_functions);

    wai_handle = register_dissector("wai", dissect_wai, proto_wai);
}

void
proto_reg_handoff_wai(void)
{
    dissector_add_uint("ethertype", ETHERTYPE_WAI, wai_handle);
}

/*
 * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 *
 * Local variables:
 * c-basic-offset: 4
 * tab-width: 8
 * indent-tabs-mode: nil
 * End:
 *
 * vi: set shiftwidth=4 tabstop=8 expandtab:
 * :indentSize=4:tabSize=8:noTabs=true:
 */