[tripe] / ethereal / packet-tripe.c

/* -*-c-*-
 *
 * $Id: packet-tripe.c,v 1.1 2003/10/15 09:30:19 mdw Exp $
 *
 * TrIPE protocol dissector for Ethereal
 *
 * (c) 2003 Straylight/Edgeware
 */

/*----- Licensing notice --------------------------------------------------* 
 *
 * This file is part of Trivial IP Encryption (TrIPE).
 *
 * TrIPE is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * TrIPE is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with TrIPE; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*----- Revision history --------------------------------------------------* 
 *
 * $Log: packet-tripe.c,v $
 * Revision 1.1  2003/10/15 09:30:19  mdw
 * Add support for Ethereal protocol analysis.
 *
 */

/*----- Header files ------------------------------------------------------*/

#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <netinet/in.h>

#include <glib.h>
#include <gmodule.h>
#include <epan/packet.h>

#ifdef ETHEREAL_BUGGERED
#  define plugin_address_table_t void
#  define plugin_address_table_init(x)
#else
#  include <plugins/plugin_api.h>
#endif

#include "tripe-protocol.h"

/*----- Static variables --------------------------------------------------*/

static int proto_tripe = -1;

typedef struct hfmp { int hf, hf_len, hf_val, tt; } hfmp;

static int hf_tripe_cat = -1;
static int hf_tripe_packet_type = -1;
static int hf_tripe_ct = -1;
static int hf_tripe_ct_seq = -1;
static int hf_tripe_ct_iv = -1;
static int hf_tripe_ct_cbc = -1;
static int hf_tripe_ct_mac = -1;
static int hf_tripe_kx_type = -1;
static hfmp hf_tripe_kx_mychal = { -1, -1, -1, -1 };
static int hf_tripe_kx_mycookie = -1;
static int hf_tripe_kx_yourcookie = -1;
static hfmp hf_tripe_kx_check = { -1, -1, -1, -1 };
static int hf_tripe_huh = -1;

static int tt_tripe = -1;
static int tt_tripe_ct = -1;

G_MODULE_EXPORT const gchar version[] = VERSION;

/*----- Main code ---------------------------------------------------------*/

static gint gethash(proto_tree *tt, int hf, tvbuff_t *b, gint off)
{
  proto_tree_add_item(tt, hf, b, off, 20, FALSE);
  return (off + 20); 
}

static gint getmp(proto_tree *tt, const hfmp *hf, tvbuff_t *b, gint off)
{
  guint16 len = tvb_get_ntohs(b, off);
  proto_item *ti = proto_tree_add_item(tt, hf->hf, b, off, len + 2, FALSE);
  tt = proto_item_add_subtree(ti, hf->tt);
  proto_tree_add_item(tt, hf->hf_len, b, off, 2, FALSE);
  proto_tree_add_item(tt, hf->hf_val, b, off + 2, len, FALSE);
  return (off + 2 + len);
}

static void dissect_tripe(tvbuff_t *b, packet_info *p, proto_tree *t)
{
  proto_item *ti;
  proto_tree *tt;
  guint8 ty;
  gint off = tvb_raw_offset(b);
  guint32 seq;

  /* --- Initialize the summary cells --- */

  if (check_col(p->cinfo, COL_PROTOCOL))
    col_set_str(p->cinfo, COL_PROTOCOL, "TrIPE");
  ty = tvb_get_guint8(b, 0);
  if (check_col(p->cinfo, COL_INFO)) {
    col_clear(p->cinfo, COL_INFO);
    switch (ty & MSG_CATMASK) {
      case MSG_PACKET:
	switch (ty & MSG_TYPEMASK) {
	  case 0:
	    col_set_str(p->cinfo, COL_INFO, "Packet data");
	    break;
	  default:
	    col_add_fstr(p->cinfo, COL_INFO,
			 "Packet data, unknown type code %u",
			 ty & MSG_TYPEMASK);
	    break;
	}
	break;
      case MSG_KEYEXCH:
	switch (ty & MSG_TYPEMASK) {
	  case KX_PRECHAL:
	    col_set_str(p->cinfo, COL_INFO, "Key exchange, prechallenge");
	    break;
	  case KX_COOKIE:
	    col_set_str(p->cinfo, COL_INFO, "Key exchange, cookie");
	    break;
	  case KX_CHAL:
	    col_set_str(p->cinfo, COL_INFO, "Key exchange, challenge");
	    break;
	  case KX_REPLY:
	    col_set_str(p->cinfo, COL_INFO, "Key exchange, reply");
	    break;
	  case KX_SWITCH:
	    col_set_str(p->cinfo, COL_INFO, "Key exchange, switch request");
	    break;
	  case KX_SWITCHOK:
	    col_set_str(p->cinfo, COL_INFO, "Key exchange, switch response");
	    break;
	  default:
	    col_add_fstr(p->cinfo, COL_INFO,
			 "Key exchange, unknown type code %u",
			 ty & MSG_TYPEMASK);
	    break;
	}
	break;
      default:
	col_add_fstr(p->cinfo, COL_INFO,
		     "Unknown category code %u, unknown type code %u",
		     ty & MSG_CATMASK, ty & MSG_TYPEMASK);
	break;
    }
  }

  /* --- Fill in the tree --- */

  if (t) {
    ti = proto_tree_add_item(t, proto_tripe, b, 0, -1, FALSE);
    tt = proto_item_add_subtree(ti, tt_tripe);

    proto_tree_add_item(tt, hf_tripe_cat, b, 0, 1, FALSE);

    off = 1;
    switch (ty & MSG_CATMASK) {
      case MSG_PACKET:
	proto_tree_add_item(tt, hf_tripe_packet_type, b, 0, 1, FALSE);
	switch (ty & MSG_TYPEMASK) {
	  case 0:
	    goto ct;
	  default:
	    goto huh;
	}
	break;
      case MSG_KEYEXCH:
	proto_tree_add_item(tt, hf_tripe_kx_type, b, 0, 1, FALSE);
	switch (ty & MSG_TYPEMASK) {
	  case KX_PRECHAL:
	    off = getmp(tt, &hf_tripe_kx_mychal, b, off);
	    goto tail;
	  case KX_COOKIE:
	    off = getmp(tt, &hf_tripe_kx_mychal, b, off);
	    off = gethash(tt, hf_tripe_kx_yourcookie, b, off);
	    goto tail;
	  case KX_CHAL:
	    off = getmp(tt, &hf_tripe_kx_mychal, b, off);
	    off = gethash(tt, hf_tripe_kx_yourcookie, b, off);
	    off = getmp(tt, &hf_tripe_kx_check, b, off);
	    goto tail;
	  case KX_REPLY:
	    off = gethash(tt, hf_tripe_kx_mycookie, b, off);
	    off = gethash(tt, hf_tripe_kx_yourcookie, b, off);
	    off = getmp(tt, &hf_tripe_kx_check, b, off);
	    goto ct;
	  case KX_SWITCH:
	    off = gethash(tt, hf_tripe_kx_mycookie, b, off);
	    off = gethash(tt, hf_tripe_kx_yourcookie, b, off);
	    goto ct;
	  case KX_SWITCHOK:
	    goto ct;
	  default:
	    goto huh;
	}
	break;
      default:
	goto huh;
    }
  tail:
    if (tvb_offset_exists(b, off))
      goto huh;
    goto done;
  huh:
    proto_tree_add_item(tt, hf_tripe_huh, b, off, -1, FALSE);
    goto done;
  ct:
    ti = proto_tree_add_item(tt, hf_tripe_ct, b, off, -1, FALSE);
    seq = tvb_get_ntohl(b, off + 10);
    proto_item_set_text(ti, "Encrypted ciphertext (sequence number %lu)",
			(unsigned long)seq);
    tt = proto_item_add_subtree(ti, tt_tripe_ct);
    proto_tree_add_item(tt, hf_tripe_ct_mac, b, off, 10, FALSE);
    off += 10;
    proto_tree_add_item(tt, hf_tripe_ct_seq, b, off, 4, FALSE);
    off += 4;
    proto_tree_add_item(tt, hf_tripe_ct_iv, b, off, 8, FALSE);
    off += 8;
    proto_tree_add_item(ti, hf_tripe_ct_cbc, b, off, -1, FALSE);
    goto done;
  done:;
  }  
}

void proto_register_tripe(void)
{
  static value_string vs_kxtype[] = {
    { KX_PRECHAL,	"KX_PRECHAL (prechallenge)" },
    { KX_COOKIE,	"KX_COOKIE (cookie)" },
    { KX_CHAL,		"KX_CHAL (challenge)" },
    { KX_REPLY,		"KX_REPLY (reply)" },
    { KX_SWITCH,	"KX_SWITCH (switch request)" },
    { KX_SWITCHOK,	"KX_SWITCHOK (switch response)" },
    { 0,		0 }
  };

  static hf_register_info hfs[] = {
    &hf_tripe_cat, {
      "Message category", "tripe.cat",
      FT_UINT8, BASE_HEX, 0, MSG_CATMASK
    },
    &hf_tripe_packet_type, {
      "Packet message type", "tripe.packet.type",
      FT_UINT8, BASE_HEX, 0, MSG_TYPEMASK,
      "This is the TrIPE packet type subcode."
    },
    &hf_tripe_ct, {
      "Encrypted ciphertext", "tripe.ct",
      FT_BYTES, BASE_NONE, 0, 0,
      "This is an encrypted message."
    },
    &hf_tripe_ct_seq, {
      "Ciphertext sequence number", "tripe.ct.seq",
      FT_UINT32, BASE_DEC, 0, 0,
      "This is the unique sequence number for the ciphertext."
    },
    &hf_tripe_ct_iv, {
      "Ciphertext initialization vector", "tripe.ct.iv",
      FT_BYTES, BASE_NONE, 0, 0,
      "This is the initialization vector used for the actual encryption."
    },
    &hf_tripe_ct_cbc, {
      "CBC-encrypted data", "tripe.ct.cbc",
      FT_BYTES, BASE_NONE, 0, 0,
      "This is the CBC-encrypted message.  Reading it ought to be hard."
    },
    &hf_tripe_ct_mac, {
      "Message authentication code", "tripe.ct.mac",
      FT_BYTES, BASE_NONE, 0, 0,
      "This is the message authentication code for the ciphertext."
    },
    &hf_tripe_kx_type, {
      "Key-exchange message type", "tripe.kx.type",
      FT_UINT8, BASE_HEX, vs_kxtype, MSG_TYPEMASK,
      "This is the TrIPE key-exchange type subcode."
    },
    &hf_tripe_kx_mychal.hf, {
      "Sender's challenge data", "tripe.kx.mychal",
      FT_BYTES, BASE_NONE, 0, 0,
      "This is the sender's challenge value."
    },
    &hf_tripe_kx_mychal.hf_len, {
      "Challenge length", "tripe.kx.mychal.len",
      FT_UINT16, BASE_DEC, 0, 0,
      "This is the length of the sender's challenge value."
    },
    &hf_tripe_kx_mychal.hf_val, {
      "Challenge value", "tripe.kx.mychal.val",
      FT_BYTES, BASE_NONE, 0, 0,
      "This is the value of the sender's challenge value."
    },
    &hf_tripe_kx_mycookie, {
      "Sender's hashed cookie", "tripe.kx.mycookie",
      FT_BYTES, BASE_NONE, 0, 0,
      "This is the hash of the sender's challenge."
    },
    &hf_tripe_kx_yourcookie, {
      "Recipient's hashed cookie", "tripe.kx.yourcookie",
      FT_BYTES, BASE_NONE, 0, 0,
      "This is the hash of the recipient's challenge."
    },
    &hf_tripe_kx_check.hf, {
      "Challenge check-value", "tripe.kx.check",
      FT_BYTES, BASE_NONE, 0, 0,
      "This is an encrypted check-value which proves that the sender "
      "knows the answer to the challenge, and that it is therefore honest."
    },
    &hf_tripe_kx_check.hf_len, {
      "Check-value length", "tripe.kx.check.len",
      FT_UINT16, BASE_DEC, 0, 0,
      "This is the length of the encrypted check-value."
    },
    &hf_tripe_kx_check.hf_val, {
      "Check-value data", "tripe.kx.check.val",
      FT_BYTES, BASE_NONE, 0, 0,
      "This is the actual encrypted check-value."
    },
    &hf_tripe_huh, {
      "Unknown data", "tripe.huh",
      FT_BYTES, BASE_NONE, 0, 0,
      "I don't know what's meant to appear here."
    },
  };

  static gint *tts[] = {
    &tt_tripe,
    &tt_tripe_ct,
    &hf_tripe_kx_mychal.tt,
    &hf_tripe_kx_check.tt,
  };

  proto_tripe = proto_register_protocol("TrIPE", "TrIPE", "tripe");
  proto_register_field_array(proto_tripe, hfs, array_length(hfs));
  proto_register_subtree_array(tts, array_length(tts));
}

void proto_reg_handoff_tripe(void)
{
  dissector_handle_t dh;

  dh = create_dissector_handle(dissect_tripe, proto_tripe);
  dissector_add("udp.port", 22003, dh);
}

G_MODULE_EXPORT void plugin_reg_handoff(void)
{
  proto_reg_handoff_tripe();
}

G_MODULE_EXPORT void plugin_init(plugin_address_table_t *pat)
{
  plugin_address_table_init(pat);
  if (proto_tripe == -1)
    proto_register_tripe();
}

/*----- That's all, folks -------------------------------------------------*/
Commit	Line	Data
165db1a8	1	/* --c--
	2	*
	3	* $Id: packet-tripe.c,v 1.1 2003/10/15 09:30:19 mdw Exp $
	4	*
	5	* TrIPE protocol dissector for Ethereal
	6	*
	7	* (c) 2003 Straylight/Edgeware
	8	*/
	9
	10	/----- Licensing notice --------------------------------------------------
	11	*
	12	* This file is part of Trivial IP Encryption (TrIPE).
	13	*
	14	* TrIPE is free software; you can redistribute it and/or modify
	15	* it under the terms of the GNU General Public License as published by
	16	* the Free Software Foundation; either version 2 of the License, or
	17	* (at your option) any later version.
	18	*
	19	* TrIPE is distributed in the hope that it will be useful,
	20	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	21	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	22	* GNU General Public License for more details.
	23	*
	24	* You should have received a copy of the GNU General Public License
	25	* along with TrIPE; if not, write to the Free Software Foundation,
	26	* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	27	*/
	28
	29	/----- Revision history --------------------------------------------------
	30	*
	31	* $Log: packet-tripe.c,v $
	32	* Revision 1.1 2003/10/15 09:30:19 mdw
	33	* Add support for Ethereal protocol analysis.
	34	*
	35	*/
	36
	37	/----- Header files ------------------------------------------------------/
	38
	39	#include "config.h"
	40
	41	#include <stdio.h>
	42	#include <stdlib.h>
	43	#include <string.h>
	44
	45	#include <netinet/in.h>
	46
	47	#include <glib.h>
	48	#include <gmodule.h>
	49	#include <epan/packet.h>
	50
	51	#ifdef ETHEREAL_BUGGERED
	52	# define plugin_address_table_t void
	53	# define plugin_address_table_init(x)
	54	#else
	55	# include <plugins/plugin_api.h>
	56	#endif
	57
	58	#include "tripe-protocol.h"
	59
	60	/----- Static variables --------------------------------------------------/
	61
	62	static int proto_tripe = -1;
	63
	64	typedef struct hfmp { int hf, hf_len, hf_val, tt; } hfmp;
65
66	static int hf_tripe_cat = -1;
67	static int hf_tripe_packet_type = -1;
68	static int hf_tripe_ct = -1;
69	static int hf_tripe_ct_seq = -1;
70	static int hf_tripe_ct_iv = -1;
71	static int hf_tripe_ct_cbc = -1;
72	static int hf_tripe_ct_mac = -1;
73	static int hf_tripe_kx_type = -1;
74	static hfmp hf_tripe_kx_mychal = { -1, -1, -1, -1 };
75	static int hf_tripe_kx_mycookie = -1;
76	static int hf_tripe_kx_yourcookie = -1;
77	static hfmp hf_tripe_kx_check = { -1, -1, -1, -1 };
78	static int hf_tripe_huh = -1;
79
80	static int tt_tripe = -1;
81	static int tt_tripe_ct = -1;
82
83	G_MODULE_EXPORT const gchar version[] = VERSION;
84
85	/----- Main code ---------------------------------------------------------/
86
87	static gint gethash(proto_tree tt, int hf, tvbuff_t b, gint off)
88	{
89	proto_tree_add_item(tt, hf, b, off, 20, FALSE);
90	return (off + 20);
91	}
92
93	static gint getmp(proto_tree tt, const hfmp hf, tvbuff_t *b, gint off)
94	{
95	guint16 len = tvb_get_ntohs(b, off);
96	proto_item *ti = proto_tree_add_item(tt, hf->hf, b, off, len + 2, FALSE);
97	tt = proto_item_add_subtree(ti, hf->tt);
98	proto_tree_add_item(tt, hf->hf_len, b, off, 2, FALSE);
99	proto_tree_add_item(tt, hf->hf_val, b, off + 2, len, FALSE);
100	return (off + 2 + len);
101	}
102
103	static void dissect_tripe(tvbuff_t b, packet_info p, proto_tree *t)
104	{
105	proto_item *ti;
106	proto_tree *tt;
107	guint8 ty;
108	gint off = tvb_raw_offset(b);
109	guint32 seq;
110
111	/* --- Initialize the summary cells --- */
112
113	if (check_col(p->cinfo, COL_PROTOCOL))
114	col_set_str(p->cinfo, COL_PROTOCOL, "TrIPE");
115	ty = tvb_get_guint8(b, 0);
116	if (check_col(p->cinfo, COL_INFO)) {
117	col_clear(p->cinfo, COL_INFO);
118	switch (ty & MSG_CATMASK) {
119	case MSG_PACKET:
120	switch (ty & MSG_TYPEMASK) {
121	case 0:
122	col_set_str(p->cinfo, COL_INFO, "Packet data");
123	break;
124	default:
125	col_add_fstr(p->cinfo, COL_INFO,
126	"Packet data, unknown type code %u",
127	ty & MSG_TYPEMASK);
128	break;
129	}
130	break;
131	case MSG_KEYEXCH:
132	switch (ty & MSG_TYPEMASK) {
133	case KX_PRECHAL:
134	col_set_str(p->cinfo, COL_INFO, "Key exchange, prechallenge");
135	break;
136	case KX_COOKIE:
137	col_set_str(p->cinfo, COL_INFO, "Key exchange, cookie");
138	break;
139	case KX_CHAL:
140	col_set_str(p->cinfo, COL_INFO, "Key exchange, challenge");
141	break;
142	case KX_REPLY:
143	col_set_str(p->cinfo, COL_INFO, "Key exchange, reply");
144	break;
145	case KX_SWITCH:
146	col_set_str(p->cinfo, COL_INFO, "Key exchange, switch request");
147	break;
148	case KX_SWITCHOK:
149	col_set_str(p->cinfo, COL_INFO, "Key exchange, switch response");
150	break;
151	default:
152	col_add_fstr(p->cinfo, COL_INFO,
153	"Key exchange, unknown type code %u",
154	ty & MSG_TYPEMASK);
155	break;
156	}
157	break;
158	default:
159	col_add_fstr(p->cinfo, COL_INFO,
160	"Unknown category code %u, unknown type code %u",
161	ty & MSG_CATMASK, ty & MSG_TYPEMASK);
162	break;
163	}
164	}
165
166	/* --- Fill in the tree --- */
167
168	if (t) {
169	ti = proto_tree_add_item(t, proto_tripe, b, 0, -1, FALSE);
170	tt = proto_item_add_subtree(ti, tt_tripe);
171
172	proto_tree_add_item(tt, hf_tripe_cat, b, 0, 1, FALSE);
173
174	off = 1;
175	switch (ty & MSG_CATMASK) {
176	case MSG_PACKET:
177	proto_tree_add_item(tt, hf_tripe_packet_type, b, 0, 1, FALSE);
178	switch (ty & MSG_TYPEMASK) {
179	case 0:
180	goto ct;
181	default:
182	goto huh;
183	}
184	break;
185	case MSG_KEYEXCH:
186	proto_tree_add_item(tt, hf_tripe_kx_type, b, 0, 1, FALSE);
187	switch (ty & MSG_TYPEMASK) {
188	case KX_PRECHAL:
189	off = getmp(tt, &hf_tripe_kx_mychal, b, off);
190	goto tail;
191	case KX_COOKIE:
192	off = getmp(tt, &hf_tripe_kx_mychal, b, off);
193	off = gethash(tt, hf_tripe_kx_yourcookie, b, off);
194	goto tail;
195	case KX_CHAL:
196	off = getmp(tt, &hf_tripe_kx_mychal, b, off);
197	off = gethash(tt, hf_tripe_kx_yourcookie, b, off);
198	off = getmp(tt, &hf_tripe_kx_check, b, off);
199	goto tail;
200	case KX_REPLY:
201	off = gethash(tt, hf_tripe_kx_mycookie, b, off);
202	off = gethash(tt, hf_tripe_kx_yourcookie, b, off);
203	off = getmp(tt, &hf_tripe_kx_check, b, off);
204	goto ct;
205	case KX_SWITCH:
206	off = gethash(tt, hf_tripe_kx_mycookie, b, off);
207	off = gethash(tt, hf_tripe_kx_yourcookie, b, off);
208	goto ct;
209	case KX_SWITCHOK:
210	goto ct;
211	default:
212	goto huh;
213	}
214	break;
215	default:
216	goto huh;
217	}
218	tail:
219	if (tvb_offset_exists(b, off))
220	goto huh;
221	goto done;
222	huh:
223	proto_tree_add_item(tt, hf_tripe_huh, b, off, -1, FALSE);
224	goto done;
225	ct:
226	ti = proto_tree_add_item(tt, hf_tripe_ct, b, off, -1, FALSE);
227	seq = tvb_get_ntohl(b, off + 10);
228	proto_item_set_text(ti, "Encrypted ciphertext (sequence number %lu)",
229	(unsigned long)seq);
230	tt = proto_item_add_subtree(ti, tt_tripe_ct);
231	proto_tree_add_item(tt, hf_tripe_ct_mac, b, off, 10, FALSE);
232	off += 10;
233	proto_tree_add_item(tt, hf_tripe_ct_seq, b, off, 4, FALSE);
234	off += 4;
235	proto_tree_add_item(tt, hf_tripe_ct_iv, b, off, 8, FALSE);
236	off += 8;
237	proto_tree_add_item(ti, hf_tripe_ct_cbc, b, off, -1, FALSE);
238	goto done;
239	done:;
240	}
241	}
242
243	void proto_register_tripe(void)
244	{
245	static value_string vs_kxtype[] = {
246	{ KX_PRECHAL, "KX_PRECHAL (prechallenge)" },
247	{ KX_COOKIE, "KX_COOKIE (cookie)" },
248	{ KX_CHAL, "KX_CHAL (challenge)" },
249	{ KX_REPLY, "KX_REPLY (reply)" },
250	{ KX_SWITCH, "KX_SWITCH (switch request)" },
251	{ KX_SWITCHOK, "KX_SWITCHOK (switch response)" },
252	{ 0, 0 }
253	};
254
255	static hf_register_info hfs[] = {
256	&hf_tripe_cat, {
257	"Message category", "tripe.cat",
258	FT_UINT8, BASE_HEX, 0, MSG_CATMASK
259	},
260	&hf_tripe_packet_type, {
261	"Packet message type", "tripe.packet.type",
262	FT_UINT8, BASE_HEX, 0, MSG_TYPEMASK,
263	"This is the TrIPE packet type subcode."
264	},
265	&hf_tripe_ct, {
266	"Encrypted ciphertext", "tripe.ct",
267	FT_BYTES, BASE_NONE, 0, 0,
268	"This is an encrypted message."
269	},
270	&hf_tripe_ct_seq, {
271	"Ciphertext sequence number", "tripe.ct.seq",
272	FT_UINT32, BASE_DEC, 0, 0,
273	"This is the unique sequence number for the ciphertext."
274	},
275	&hf_tripe_ct_iv, {
276	"Ciphertext initialization vector", "tripe.ct.iv",
277	FT_BYTES, BASE_NONE, 0, 0,
278	"This is the initialization vector used for the actual encryption."
279	},
280	&hf_tripe_ct_cbc, {
281	"CBC-encrypted data", "tripe.ct.cbc",
282	FT_BYTES, BASE_NONE, 0, 0,
283	"This is the CBC-encrypted message. Reading it ought to be hard."
284	},
285	&hf_tripe_ct_mac, {
286	"Message authentication code", "tripe.ct.mac",
287	FT_BYTES, BASE_NONE, 0, 0,
288	"This is the message authentication code for the ciphertext."
289	},
290	&hf_tripe_kx_type, {
291	"Key-exchange message type", "tripe.kx.type",
292	FT_UINT8, BASE_HEX, vs_kxtype, MSG_TYPEMASK,
293	"This is the TrIPE key-exchange type subcode."
294	},
295	&hf_tripe_kx_mychal.hf, {
296	"Sender's challenge data", "tripe.kx.mychal",
297	FT_BYTES, BASE_NONE, 0, 0,
298	"This is the sender's challenge value."
299	},
300	&hf_tripe_kx_mychal.hf_len, {
301	"Challenge length", "tripe.kx.mychal.len",
302	FT_UINT16, BASE_DEC, 0, 0,
303	"This is the length of the sender's challenge value."
304	},
305	&hf_tripe_kx_mychal.hf_val, {
306	"Challenge value", "tripe.kx.mychal.val",
307	FT_BYTES, BASE_NONE, 0, 0,
308	"This is the value of the sender's challenge value."
309	},
310	&hf_tripe_kx_mycookie, {
311	"Sender's hashed cookie", "tripe.kx.mycookie",
312	FT_BYTES, BASE_NONE, 0, 0,
313	"This is the hash of the sender's challenge."
314	},
315	&hf_tripe_kx_yourcookie, {
316	"Recipient's hashed cookie", "tripe.kx.yourcookie",
317	FT_BYTES, BASE_NONE, 0, 0,
318	"This is the hash of the recipient's challenge."
319	},
320	&hf_tripe_kx_check.hf, {
321	"Challenge check-value", "tripe.kx.check",
322	FT_BYTES, BASE_NONE, 0, 0,
323	"This is an encrypted check-value which proves that the sender "
324	"knows the answer to the challenge, and that it is therefore honest."
325	},
326	&hf_tripe_kx_check.hf_len, {
327	"Check-value length", "tripe.kx.check.len",
328	FT_UINT16, BASE_DEC, 0, 0,
329	"This is the length of the encrypted check-value."
330	},
331	&hf_tripe_kx_check.hf_val, {
332	"Check-value data", "tripe.kx.check.val",
333	FT_BYTES, BASE_NONE, 0, 0,
334	"This is the actual encrypted check-value."
335	},
336	&hf_tripe_huh, {
337	"Unknown data", "tripe.huh",
338	FT_BYTES, BASE_NONE, 0, 0,
339	"I don't know what's meant to appear here."
340	},
341	};
342
343	static gint *tts[] = {
344	&tt_tripe,
345	&tt_tripe_ct,
346	&hf_tripe_kx_mychal.tt,
347	&hf_tripe_kx_check.tt,
348	};
349
350	proto_tripe = proto_register_protocol("TrIPE", "TrIPE", "tripe");
351	proto_register_field_array(proto_tripe, hfs, array_length(hfs));
352	proto_register_subtree_array(tts, array_length(tts));
353	}
354
355	void proto_reg_handoff_tripe(void)
356	{
357	dissector_handle_t dh;
358
359	dh = create_dissector_handle(dissect_tripe, proto_tripe);
360	dissector_add("udp.port", 22003, dh);
361	}
362
363	G_MODULE_EXPORT void plugin_reg_handoff(void)
364	{
365	proto_reg_handoff_tripe();
366	}
367
368	G_MODULE_EXPORT void plugin_init(plugin_address_table_t *pat)
369	{
370	plugin_address_table_init(pat);
371	if (proto_tripe == -1)
372	proto_register_tripe();
373	}
374
375	/----- That's all, folks -------------------------------------------------/