0002f25f29
Change-Id: I24895950464e1845c468f9fa9b6e5aa3ab8c75de Reviewed-on: https://code.wireshark.org/review/16378 Reviewed-by: Jaap Keuter <jaap.keuter@xs4all.nl> Petri-Dish: Jaap Keuter <jaap.keuter@xs4all.nl> Reviewed-by: Anders Broman <a.broman58@gmail.com>
339 lines
12 KiB
C
339 lines
12 KiB
C
/* packet-hdcp2.c
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* Routines for HDCP2 dissection
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* Copyright 2011-2012, Martin Kaiser <martin@kaiser.cx>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* This dissector supports HDCP 2.x over TCP. For now, only the
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* authentication protocol messages are supported.
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*
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* The specification of version 2 of the protocol can be found at
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* http://www.digital-cp.com/files/static_page_files/DABB540C-1A4B-B294-D0008CB2D348FA19/HDCP Interface Independent Adaptation Specification Rev2_1.pdf
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include <epan/ptvcursor.h>
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#include <epan/expert.h>
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void proto_register_hdcp2(void);
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void proto_reg_handoff_hdcp2(void);
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static int proto_hdcp2 = -1;
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static gint ett_hdcp2 = -1;
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static gint ett_hdcp2_cert = -1;
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static int hf_hdcp2_msg_id = -1;
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static int hf_hdcp2_r_tx = -1;
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static int hf_hdcp2_repeater = -1;
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static int hf_hdcp2_cert_rcv_id = -1;
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static int hf_hdcp2_cert_n = -1;
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static int hf_hdcp2_cert_e = -1;
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static int hf_hdcp2_cert_rcv_sig = -1;
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static int hf_hdcp2_e_kpub_km = -1;
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static int hf_hdcp2_e_kh_km = -1;
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static int hf_hdcp2_m = -1;
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static int hf_hdcp2_r_rx = -1;
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static int hf_hdcp2_h_prime = -1;
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static int hf_hdcp2_r_n = -1;
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static int hf_hdcp2_l_prime = -1;
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static int hf_hdcp2_e_dkey_ks = -1;
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static int hf_hdcp2_r_iv = -1;
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static int hf_hdcp2_reserved = -1;
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static expert_field ei_hdcp2_reserved_0 = EI_INIT;
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#define ID_AKE_INIT 2
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#define ID_AKE_SEND_CERT 3
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#define ID_AKE_NO_STORED_KM 4
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#define ID_AKE_STORED_KM 5
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#define ID_AKE_SEND_RRX 6
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#define ID_AKE_SEND_H_PRIME 7
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#define ID_AKE_SEND_PAIRING_INFO 8
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#define ID_LC_INIT 9
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#define ID_LC_SEND_L_PRIME 10
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#define ID_SKE_SEND_EKS 11
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#define ID_MAX 31
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#define RCV_ID_LEN 5 /* all lengths are in bytes */
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#define N_LEN 128
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#define E_LEN 3
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#define RCV_SIG_LEN 384
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#define CERT_RX_LEN (RCV_ID_LEN + N_LEN + E_LEN + 2 + RCV_SIG_LEN)
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static const value_string hdcp2_msg_id[] = {
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{ ID_AKE_INIT, "AKE_Init" },
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{ ID_AKE_SEND_CERT, "AKE_Send_Cert" },
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{ ID_AKE_NO_STORED_KM, "AKE_No_Stored_km" },
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{ ID_AKE_STORED_KM, "AKE_Stored_km" },
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{ ID_AKE_SEND_RRX, "AKE_Send_rrx" },
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{ ID_AKE_SEND_H_PRIME, "AKE_Send_H_prime" },
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{ ID_AKE_SEND_PAIRING_INFO, "AKE_Send_Pairing_Info" },
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{ ID_LC_INIT, "LC_Init" },
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{ ID_LC_SEND_L_PRIME, "LC_Send_L_prime" },
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{ ID_SKE_SEND_EKS, "SKE_Send_Eks" },
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{ 0, NULL }
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};
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typedef struct _msg_info_t {
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guint8 id;
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guint16 len; /* number of bytes following initial msg_id field */
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} msg_info_t;
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static GHashTable *msg_table = NULL;
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static const msg_info_t msg_info[] = {
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{ ID_AKE_INIT, 8 },
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{ ID_AKE_SEND_CERT, 1+CERT_RX_LEN },
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{ ID_AKE_NO_STORED_KM, 128 },
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{ ID_AKE_STORED_KM, 32 },
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{ ID_AKE_SEND_RRX, 8 },
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{ ID_AKE_SEND_H_PRIME, 32 },
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{ ID_AKE_SEND_PAIRING_INFO, 16 },
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{ ID_LC_INIT, 8 },
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{ ID_LC_SEND_L_PRIME, 32 },
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{ ID_SKE_SEND_EKS, 24 }
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};
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static int
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dissect_hdcp2(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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msg_info_t *mi;
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proto_item *pi;
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proto_tree *hdcp_tree, *cert_tree;
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guint8 msg_id;
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gboolean repeater;
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guint16 reserved;
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ptvcursor_t *cursor;
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/* do the plausibility checks before setting up anything */
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/* make sure that tvb_get_guint8() won't throw an exception */
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if (tvb_captured_length(tvb) < 1)
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return 0;
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msg_id = tvb_get_guint8(tvb, 0);
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if (msg_id > ID_MAX)
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return 0;
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mi = (msg_info_t *)g_hash_table_lookup(msg_table,
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GUINT_TO_POINTER((guint)msg_id));
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/* 1 -> start after msg_id byte */
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if (!mi || mi->len!=tvb_reported_length_remaining(tvb, 1))
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return 0;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "HDCP2");
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col_clear(pinfo->cinfo, COL_INFO);
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pi = proto_tree_add_protocol_format(tree, proto_hdcp2,
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tvb, 0, tvb_reported_length(tvb), "HDCP2");
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hdcp_tree = proto_item_add_subtree(pi, ett_hdcp2);
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cursor = ptvcursor_new(hdcp_tree, tvb, 0);
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col_append_fstr(pinfo->cinfo, COL_INFO, "%s",
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val_to_str(msg_id, hdcp2_msg_id, "unknown (0x%x)"));
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ptvcursor_add(cursor, hf_hdcp2_msg_id, 1, ENC_BIG_ENDIAN);
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switch (msg_id) {
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case ID_AKE_INIT:
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ptvcursor_add(cursor, hf_hdcp2_r_tx, 8, ENC_BIG_ENDIAN);
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break;
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case ID_AKE_SEND_CERT:
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repeater = ((tvb_get_guint8(tvb, ptvcursor_current_offset(cursor))
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& 0x01) == 0x01);
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col_append_sep_fstr(pinfo->cinfo, COL_INFO, NULL, "%s",
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repeater ? "repeater" : "no repeater");
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ptvcursor_add(cursor, hf_hdcp2_repeater, 1, ENC_BIG_ENDIAN);
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cert_tree = ptvcursor_add_text_with_subtree(cursor, CERT_RX_LEN,
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ett_hdcp2_cert, "%s", "HDCP2 Certificate");
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ptvcursor_add(cursor, hf_hdcp2_cert_rcv_id, RCV_ID_LEN, ENC_NA);
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ptvcursor_add(cursor, hf_hdcp2_cert_n, N_LEN, ENC_NA);
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ptvcursor_add(cursor, hf_hdcp2_cert_e, E_LEN, ENC_BIG_ENDIAN);
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reserved = tvb_get_ntohs(tvb, ptvcursor_current_offset(cursor));
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pi = proto_tree_add_item(cert_tree, hf_hdcp2_reserved, tvb,
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ptvcursor_current_offset(cursor), 2, ENC_BIG_ENDIAN);
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if (reserved != 0) {
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expert_add_info(pinfo, pi, &ei_hdcp2_reserved_0);
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}
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ptvcursor_advance(cursor, 2);
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ptvcursor_add(cursor, hf_hdcp2_cert_rcv_sig, RCV_SIG_LEN, ENC_NA);
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ptvcursor_pop_subtree(cursor);
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break;
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case ID_AKE_NO_STORED_KM:
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ptvcursor_add(cursor, hf_hdcp2_e_kpub_km, 128, ENC_NA);
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break;
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case ID_AKE_STORED_KM:
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ptvcursor_add(cursor, hf_hdcp2_e_kh_km, 16, ENC_NA);
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ptvcursor_add(cursor, hf_hdcp2_m, 16, ENC_NA);
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break;
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case ID_AKE_SEND_RRX:
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ptvcursor_add(cursor, hf_hdcp2_r_rx, 8, ENC_BIG_ENDIAN);
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break;
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case ID_AKE_SEND_H_PRIME:
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ptvcursor_add(cursor, hf_hdcp2_h_prime, 32, ENC_NA);
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break;
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case ID_AKE_SEND_PAIRING_INFO:
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ptvcursor_add(cursor, hf_hdcp2_e_kh_km, 16, ENC_NA);
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break;
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case ID_LC_INIT:
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ptvcursor_add(cursor, hf_hdcp2_r_n, 8, ENC_BIG_ENDIAN);
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break;
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case ID_LC_SEND_L_PRIME:
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ptvcursor_add(cursor, hf_hdcp2_l_prime, 32, ENC_NA);
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break;
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case ID_SKE_SEND_EKS:
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ptvcursor_add(cursor, hf_hdcp2_e_dkey_ks, 16, ENC_NA);
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ptvcursor_add(cursor, hf_hdcp2_r_iv, 8, ENC_BIG_ENDIAN);
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break;
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default:
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break;
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}
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ptvcursor_free(cursor);
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return tvb_reported_length(tvb);
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}
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void
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proto_register_hdcp2(void)
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{
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guint i;
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static hf_register_info hf[] = {
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{ &hf_hdcp2_msg_id,
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{ "Message ID", "hdcp2.msg_id", FT_UINT8, BASE_HEX,
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VALS(hdcp2_msg_id), 0, NULL, HFILL } },
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{ &hf_hdcp2_r_tx,
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{ "r_tx", "hdcp2.r_tx", FT_UINT64, BASE_HEX,
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NULL, 0, NULL, HFILL } },
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{ &hf_hdcp2_repeater,
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{ "Repeater", "hdcp2.repeater", FT_BOOLEAN, 8,
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NULL, 0x1, NULL, HFILL } },
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{ &hf_hdcp2_cert_rcv_id,
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{ "Receiver ID", "hdcp2.cert.rcv_id", FT_BYTES, BASE_NONE,
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NULL, 0, NULL, HFILL } },
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{ &hf_hdcp2_cert_n,
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{ "Receiver RSA key n", "hdcp2.cert.n", FT_BYTES, BASE_NONE,
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NULL, 0, NULL, HFILL } },
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{ &hf_hdcp2_cert_e,
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{ "Receiver RSA key e", "hdcp2.cert.e", FT_UINT24, BASE_HEX,
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NULL, 0, NULL, HFILL } },
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{ &hf_hdcp2_cert_rcv_sig,
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{ "Receiver signature", "hdcp2.cert.rcv_sig", FT_BYTES,
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BASE_NONE, NULL, 0, NULL, HFILL } },
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{ &hf_hdcp2_e_kpub_km,
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{ "E_kpub_km", "hdcp2.e_kpub_km", FT_BYTES, BASE_NONE,
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NULL, 0, NULL, HFILL } },
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{ &hf_hdcp2_e_kh_km,
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{ "E_kh_km", "hdcp2.e_kh_km", FT_BYTES, BASE_NONE,
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NULL, 0, NULL, HFILL } },
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{ &hf_hdcp2_m,
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{ "m", "hdcp2.m", FT_BYTES, BASE_NONE,
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NULL, 0, NULL, HFILL } },
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{ &hf_hdcp2_r_rx,
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{ "r_rx", "hdcp2.r_rx", FT_UINT64, BASE_HEX,
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NULL, 0, NULL, HFILL } },
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{ &hf_hdcp2_h_prime,
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{ "H'", "hdcp2.h_prime", FT_BYTES, BASE_NONE,
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NULL, 0, NULL, HFILL } },
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{ &hf_hdcp2_r_n,
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{ "r_n", "hdcp2.r_n", FT_UINT64, BASE_HEX,
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NULL, 0, NULL, HFILL } },
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{ &hf_hdcp2_l_prime,
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{ "L'", "hdcp2.l_prime", FT_BYTES, BASE_NONE,
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NULL, 0, NULL, HFILL } },
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{ &hf_hdcp2_e_dkey_ks,
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{ "E_dkey_ks", "hdcp2.e_dkey_ks", FT_BYTES, BASE_NONE,
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NULL, 0, NULL, HFILL } },
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{ &hf_hdcp2_r_iv,
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{ "r_iv", "hdcp2.r_iv", FT_UINT64, BASE_HEX,
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NULL, 0, NULL, HFILL } },
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{ &hf_hdcp2_reserved,
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{ "Reserved", "hdcp2.reserved", FT_UINT16, BASE_HEX,
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NULL, 0, NULL, HFILL } }
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};
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static gint *ett[] = {
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&ett_hdcp2,
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&ett_hdcp2_cert
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};
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static ei_register_info ei[] = {
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{ &ei_hdcp2_reserved_0, { "hdcp2.reserved.not0", PI_PROTOCOL, PI_WARN, "reserved bytes must be set to 0x0", EXPFILL }},
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};
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module_t *hdcp2_module;
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expert_module_t* expert_hdcp2;
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msg_table = g_hash_table_new(g_direct_hash, g_direct_equal);
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for(i=0; i<array_length(msg_info); i++) {
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g_hash_table_insert(msg_table,
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GUINT_TO_POINTER((guint)msg_info[i].id),
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(gpointer)(&msg_info[i]));
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}
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proto_hdcp2 = proto_register_protocol(
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"High bandwidth Digital Content Protection version 2",
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"HDCP2", "hdcp2");
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hdcp2_module = prefs_register_protocol(proto_hdcp2, proto_reg_handoff_hdcp2);
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prefs_register_obsolete_preference(hdcp2_module, "enable");
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proto_register_field_array(proto_hdcp2, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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expert_hdcp2 = expert_register_protocol(proto_hdcp2);
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expert_register_field_array(expert_hdcp2, ei, array_length(ei));
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register_dissector("hdcp2", dissect_hdcp2, proto_hdcp2);
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}
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void
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proto_reg_handoff_hdcp2(void)
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{
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static gboolean prefs_initialized = FALSE;
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if (!prefs_initialized) {
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heur_dissector_add ("tcp", dissect_hdcp2, "HDCP2 over TCP", "hdcp2_tcp", proto_hdcp2, HEURISTIC_DISABLE);
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prefs_initialized = TRUE;
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}
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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