dvd_css.c 36.9 KB
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/*****************************************************************************
 * dvd_css.c: Functions for DVD authentification and unscrambling
 *****************************************************************************
 * Copyright (C) 1999-2001 VideoLAN
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 * $Id: dvd_css.c,v 1.3 2001/02/08 17:44:12 massiot Exp $
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 *
 * Author: Stphane Borel <stef@via.ecp.fr>
 *
 * This program 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.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
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#include "defs.h"

#if defined( HAVE_SYS_DVDIO_H ) || defined( LINUX_DVD )

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#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <sys/ioctl.h>
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#ifdef HAVE_SYS_DVDIO_H
# include <sys/dvdio.h>
#endif
#ifdef LINUX_DVD
# include <linux/cdrom.h>
#endif
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#include "common.h"

#include "intf_msg.h"
#include "dvd_css.h"
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#include "dvd_ifo.h"
#include "input_dvd.h"
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#include "css_table.h"

/*****************************************************************************
 * CSS tables
 *****************************************************************************/

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unsigned int pi_css_tab0[11]={ 5, 0, 1, 2, 3, 4, 0, 1, 2, 3, 4 };
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unsigned char pi_css_tab1[256]=
{   0x33, 0x73, 0x3b, 0x26, 0x63, 0x23, 0x6b, 0x76,
    0x3e, 0x7e, 0x36, 0x2b, 0x6e, 0x2e, 0x66, 0x7b,
    0xd3, 0x93, 0xdb, 0x06, 0x43, 0x03, 0x4b, 0x96,
    0xde, 0x9e, 0xd6, 0x0b, 0x4e, 0x0e, 0x46, 0x9b,
    0x57, 0x17, 0x5f, 0x82, 0xc7, 0x87, 0xcf, 0x12,
    0x5a, 0x1a, 0x52, 0x8f, 0xca, 0x8a, 0xc2, 0x1f,
    0xd9, 0x99, 0xd1, 0x00, 0x49, 0x09, 0x41, 0x90,
    0xd8, 0x98, 0xd0, 0x01, 0x48, 0x08, 0x40, 0x91,
    0x3d, 0x7d, 0x35, 0x24, 0x6d, 0x2d, 0x65, 0x74,
    0x3c, 0x7c, 0x34, 0x25, 0x6c, 0x2c, 0x64, 0x75,
70
    0xdd, 0x9d, 0xd5, 0x04, 0x4d, 0x0d, 0x45, 0x94,
71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128
    0xdc, 0x9c, 0xd4, 0x05, 0x4c, 0x0c, 0x44, 0x95,
    0x59, 0x19, 0x51, 0x80, 0xc9, 0x89, 0xc1, 0x10,
    0x58, 0x18, 0x50, 0x81, 0xc8, 0x88, 0xc0, 0x11,
    0xd7, 0x97, 0xdf, 0x02, 0x47, 0x07, 0x4f, 0x92,
    0xda, 0x9a, 0xd2, 0x0f, 0x4a, 0x0a, 0x42, 0x9f,
    0x53, 0x13, 0x5b, 0x86, 0xc3, 0x83, 0xcb, 0x16,
    0x5e, 0x1e, 0x56, 0x8b, 0xce, 0x8e, 0xc6, 0x1b,
    0xb3, 0xf3, 0xbb, 0xa6, 0xe3, 0xa3, 0xeb, 0xf6,
    0xbe, 0xfe, 0xb6, 0xab, 0xee, 0xae, 0xe6, 0xfb,
    0x37, 0x77, 0x3f, 0x22, 0x67, 0x27, 0x6f, 0x72,
    0x3a, 0x7a, 0x32, 0x2f, 0x6a, 0x2a, 0x62, 0x7f,
    0xb9, 0xf9, 0xb1, 0xa0, 0xe9, 0xa9, 0xe1, 0xf0,
    0xb8, 0xf8, 0xb0, 0xa1, 0xe8, 0xa8, 0xe0, 0xf1,
    0x5d, 0x1d, 0x55, 0x84, 0xcd, 0x8d, 0xc5, 0x14,
    0x5c, 0x1c, 0x54, 0x85, 0xcc, 0x8c, 0xc4, 0x15,
    0xbd, 0xfd, 0xb5, 0xa4, 0xed, 0xad, 0xe5, 0xf4,
    0xbc, 0xfc, 0xb4, 0xa5, 0xec, 0xac, 0xe4, 0xf5,
    0x39, 0x79, 0x31, 0x20, 0x69, 0x29, 0x61, 0x70,
    0x38, 0x78, 0x30, 0x21, 0x68, 0x28, 0x60, 0x71,
    0xb7, 0xf7, 0xbf, 0xa2, 0xe7, 0xa7, 0xef, 0xf2,
    0xba, 0xfa, 0xb2, 0xaf, 0xea, 0xaa, 0xe2, 0xff };

unsigned char pi_css_tab2[256]=
{   0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
    0x09, 0x08, 0x0b, 0x0a, 0x0d, 0x0c, 0x0f, 0x0e,
    0x12, 0x13, 0x10, 0x11, 0x16, 0x17, 0x14, 0x15,
    0x1b, 0x1a, 0x19, 0x18, 0x1f, 0x1e, 0x1d, 0x1c,
    0x24, 0x25, 0x26, 0x27, 0x20, 0x21, 0x22, 0x23,
    0x2d, 0x2c, 0x2f, 0x2e, 0x29, 0x28, 0x2b, 0x2a,
    0x36, 0x37, 0x34, 0x35, 0x32, 0x33, 0x30, 0x31,
    0x3f, 0x3e, 0x3d, 0x3c, 0x3b, 0x3a, 0x39, 0x38,
    0x49, 0x48, 0x4b, 0x4a, 0x4d, 0x4c, 0x4f, 0x4e,
    0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
    0x5b, 0x5a, 0x59, 0x58, 0x5f, 0x5e, 0x5d, 0x5c,
    0x52, 0x53, 0x50, 0x51, 0x56, 0x57, 0x54, 0x55,
    0x6d, 0x6c, 0x6f, 0x6e, 0x69, 0x68, 0x6b, 0x6a,
    0x64, 0x65, 0x66, 0x67, 0x60, 0x61, 0x62, 0x63,
    0x7f, 0x7e, 0x7d, 0x7c, 0x7b, 0x7a, 0x79, 0x78,
    0x76, 0x77, 0x74, 0x75, 0x72, 0x73, 0x70, 0x71,
    0x92, 0x93, 0x90, 0x91, 0x96, 0x97, 0x94, 0x95,
    0x9b, 0x9a, 0x99, 0x98, 0x9f, 0x9e, 0x9d, 0x9c,
    0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
    0x89, 0x88, 0x8b, 0x8a, 0x8d, 0x8c, 0x8f, 0x8e,
    0xb6, 0xb7, 0xb4, 0xb5, 0xb2, 0xb3, 0xb0, 0xb1,
    0xbf, 0xbe, 0xbd, 0xbc, 0xbb, 0xba, 0xb9, 0xb8,
    0xa4, 0xa5, 0xa6, 0xa7, 0xa0, 0xa1, 0xa2, 0xa3,
    0xad, 0xac, 0xaf, 0xae, 0xa9, 0xa8, 0xab, 0xaa,
    0xdb, 0xda, 0xd9, 0xd8, 0xdf, 0xde, 0xdd, 0xdc,
    0xd2, 0xd3, 0xd0, 0xd1, 0xd6, 0xd7, 0xd4, 0xd5,
    0xc9, 0xc8, 0xcb, 0xca, 0xcd, 0xcc, 0xcf, 0xce,
    0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
    0xff, 0xfe, 0xfd, 0xfc, 0xfb, 0xfa, 0xf9, 0xf8,
    0xf6, 0xf7, 0xf4, 0xf5, 0xf2, 0xf3, 0xf0, 0xf1,
    0xed, 0xec, 0xef, 0xee, 0xe9, 0xe8, 0xeb, 0xea,
    0xe4, 0xe5, 0xe6, 0xe7, 0xe0, 0xe1, 0xe2, 0xe3
};

unsigned char pi_css_tab3[512]=
129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192
{   0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff,
    0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff };
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unsigned char pi_css_tab4[256]=
195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226
{   0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
    0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
    0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
    0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
    0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
    0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
    0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
    0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
    0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
    0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
    0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
    0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
    0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
    0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
    0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
    0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
    0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
    0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
    0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
    0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
    0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
    0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
    0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
    0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
    0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
    0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
    0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
    0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
    0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
    0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
    0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
    0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff };
227 228

unsigned char pi_css_tab5[256]=
229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260
{   0xff, 0x7f, 0xbf, 0x3f, 0xdf, 0x5f, 0x9f, 0x1f,
    0xef, 0x6f, 0xaf, 0x2f, 0xcf, 0x4f, 0x8f, 0x0f,
    0xf7, 0x77, 0xb7, 0x37, 0xd7, 0x57, 0x97, 0x17,
    0xe7, 0x67, 0xa7, 0x27, 0xc7, 0x47, 0x87, 0x07,
    0xfb, 0x7b, 0xbb, 0x3b, 0xdb, 0x5b, 0x9b, 0x1b,
    0xeb, 0x6b, 0xab, 0x2b, 0xcb, 0x4b, 0x8b, 0x0b,
    0xf3, 0x73, 0xb3, 0x33, 0xd3, 0x53, 0x93, 0x13,
    0xe3, 0x63, 0xa3, 0x23, 0xc3, 0x43, 0x83, 0x03,
    0xfd, 0x7d, 0xbd, 0x3d, 0xdd, 0x5d, 0x9d, 0x1d,
    0xed, 0x6d, 0xad, 0x2d, 0xcd, 0x4d, 0x8d, 0x0d,
    0xf5, 0x75, 0xb5, 0x35, 0xd5, 0x55, 0x95, 0x15,
    0xe5, 0x65, 0xa5, 0x25, 0xc5, 0x45, 0x85, 0x05,
    0xf9, 0x79, 0xb9, 0x39, 0xd9, 0x59, 0x99, 0x19,
    0xe9, 0x69, 0xa9, 0x29, 0xc9, 0x49, 0x89, 0x09,
    0xf1, 0x71, 0xb1, 0x31, 0xd1, 0x51, 0x91, 0x11,
    0xe1, 0x61, 0xa1, 0x21, 0xc1, 0x41, 0x81, 0x01,
    0xfe, 0x7e, 0xbe, 0x3e, 0xde, 0x5e, 0x9e, 0x1e,
    0xee, 0x6e, 0xae, 0x2e, 0xce, 0x4e, 0x8e, 0x0e,
    0xf6, 0x76, 0xb6, 0x36, 0xd6, 0x56, 0x96, 0x16,
    0xe6, 0x66, 0xa6, 0x26, 0xc6, 0x46, 0x86, 0x06,
    0xfa, 0x7a, 0xba, 0x3a, 0xda, 0x5a, 0x9a, 0x1a,
    0xea, 0x6a, 0xaa, 0x2a, 0xca, 0x4a, 0x8a, 0x0a,
    0xf2, 0x72, 0xb2, 0x32, 0xd2, 0x52, 0x92, 0x12,
    0xe2, 0x62, 0xa2, 0x22, 0xc2, 0x42, 0x82, 0x02,
    0xfc, 0x7c, 0xbc, 0x3c, 0xdc, 0x5c, 0x9c, 0x1c,
    0xec, 0x6c, 0xac, 0x2c, 0xcc, 0x4c, 0x8c, 0x0c,
    0xf4, 0x74, 0xb4, 0x34, 0xd4, 0x54, 0x94, 0x14,
    0xe4, 0x64, 0xa4, 0x24, 0xc4, 0x44, 0x84, 0x04,
    0xf8, 0x78, 0xb8, 0x38, 0xd8, 0x58, 0x98, 0x18,
    0xe8, 0x68, 0xa8, 0x28, 0xc8, 0x48, 0x88, 0x08,
    0xf0, 0x70, 0xb0, 0x30, 0xd0, 0x50, 0x90, 0x10,
    0xe0, 0x60, 0xa0, 0x20, 0xc0, 0x40, 0x80, 0x00 };
261 262 263 264 265 266 267 268 269 270

/*
 * Local functions
 */

/*****************************************************************************
 * CSSGetASF : Get Authentification success flag
 *****************************************************************************/
int CSSGetASF( int i_fd )
{
271
    dvd_authinfo ai;
272

273 274
    ai.type = DVD_LU_SEND_ASF;
    ai.lsasf.asf = 0;
275

276
    for( ai.lsasf.agid = 0 ; ai.lsasf.agid < 4 ; ai.lsasf.agid++ )
277
    {
278
        if( !( ioctl( i_fd, DVD_AUTH, &ai ) ) )
279
        {
280
            intf_Msg("CSS: %sAuthenticated\n", (ai.lsasf.asf) ? "" : "not");
281 282 283
            return 0;
        }
    }
284
    intf_ErrMsg( "CSS Error: GetASF" );
285
    return -1;
286 287 288 289 290 291 292 293 294
}

/*****************************************************************************
 * CSSCryptKey : shuffles bits and unencrypt keys.
 * ---
 * i_key_type : 0->key1, 1->key2, 2->buskey.
 * i_varient : between 0 and 31.
 *****************************************************************************/
static void CSSCryptKey( int i_key_type, int i_varient,
295
                         u8 const * pi_challenge, u8* pi_key )
296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311
{
    /* Permutation table for challenge */
    u8      ppi_perm_challenge[3][10] = 
            { { 1, 3, 0, 7, 5, 2, 9, 6, 4, 8 },
              { 6, 1, 9, 3, 8, 5, 7, 4, 0, 2 },
              { 4, 0, 3, 5, 7, 2, 8, 6, 1, 9 } };
    /* Permutation table for varient table */
    u8      ppi_perm_varient[2][32] =
            { { 0x0a, 0x08, 0x0e, 0x0c, 0x0b, 0x09, 0x0f, 0x0d,
                0x1a, 0x18, 0x1e, 0x1c, 0x1b, 0x19, 0x1f, 0x1d,
                0x02, 0x00, 0x06, 0x04, 0x03, 0x01, 0x07, 0x05,
                0x12, 0x10, 0x16, 0x14, 0x13, 0x11, 0x17, 0x15 },
              { 0x12, 0x1a, 0x16, 0x1e, 0x02, 0x0a, 0x06, 0x0e,
                0x10, 0x18, 0x14, 0x1c, 0x00, 0x08, 0x04, 0x0c,
                0x13, 0x1b, 0x17, 0x1f, 0x03, 0x0b, 0x07, 0x0f,
                0x11, 0x19, 0x15, 0x1d, 0x01, 0x09, 0x05, 0x0d } };
312
    u8      pi_css_secret[5] = { 0xE2, 0xA3, 0x45, 0x10, 0xF4 };
313 314 315 316 317 318 319
    u8      pi_css_varients[32] =
              { 0x00, 0x01, 0x04, 0x05, 0x10, 0x11, 0x14, 0x15,
                0x20, 0x21, 0x24, 0x25, 0x30, 0x31, 0x34, 0x35,
                0x80, 0x81, 0x84, 0x85, 0x90, 0x91, 0x94, 0x95,
                0xA0, 0xA1, 0xA4, 0xA5, 0xB0, 0xB1, 0xB4, 0xB5 };
    u8      pi_bits[30];
    u8      pi_scratch[10];
320 321 322 323 324 325 326
    u8      pi_tmp1[5];
    u8      pi_tmp2[5];
    u8      i_lfsr0_o;
    u8      i_lfsr1_o;
    u32     i_lfsr0;
    u32     i_lfsr1;
    u8      i_css_varient;
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    int     i_val = 0;
    int     i_term = 0;
    int     i, i_index;

    for( i=0 ; i<10 ; i++ )
    {
        pi_scratch[i] = pi_challenge[ppi_perm_challenge[i_key_type][i]];
    }
    i_css_varient = i_key_type == 0 ? i_varient
                    : ppi_perm_varient[i_key_type-1][i_varient];

    for( i=0 ; i<5 ; i++ )
    {
        pi_tmp1[i] = pi_scratch[5+i] ^ pi_css_secret[i];
    }

    /* In order to ensure that the LFSR works we need to ensure that the
344 345 346 347 348 349 350 351 352 353
     * initial values are non-zero.  Thus when we initialise them from
     * the seed,  we ensure that a bit is set.
     */
    i_lfsr0 = ( pi_tmp1[0] << 17 ) | ( pi_tmp1[1] << 9 ) |
              ( ( pi_tmp1[2] & ~7 ) << 1 ) | 8 | (pi_tmp1[2] & 7);

    /*
     * reverse lfsr0/1 to simplify calculation in loop
     */
    i_lfsr0 = ( pi_reverse[i_lfsr0 & 0xff] << 17 ) |
354 355 356 357
              ( pi_reverse[( i_lfsr0 >> 8 ) & 0xff] << 9 ) |
              ( pi_reverse[( i_lfsr0 >> 16 ) & 0xff] << 1) |
              ( i_lfsr0 >> 24 );

358 359
    i_lfsr1 = ( pi_reverse[pi_tmp1[4]] << 9 ) | 0x100 |
              ( pi_reverse[pi_tmp1[3]] );
360

361 362
    i_index = sizeof( pi_bits );
    do
363
    {
364
        i_lfsr0_o = ( i_lfsr0 >> 12) ^ ( i_lfsr0 >> 4) ^
365 366
                    ( i_lfsr0 >> 3) ^ i_lfsr0;

367 368 369 370 371 372 373 374 375 376 377 378 379
        i_lfsr1_o = ( ( i_lfsr1 >> 14 ) & 7) ^ i_lfsr1;
        i_lfsr1_o ^= ( i_lfsr1_o << 3 ) ^ ( i_lfsr1_o << 6 );

        i_lfsr1 = ( i_lfsr1 >> 8) ^ ( i_lfsr1_o << 9);
        i_lfsr0 = ( i_lfsr0 >> 8 ) ^ ( i_lfsr0_o << 17);

        i_lfsr0_o = ~i_lfsr0_o;
        i_lfsr1_o = ~i_lfsr1_o;

        i_val += i_lfsr0_o + i_lfsr1_o;
    
        pi_bits[--i_index] = i_val & 0xFF;
        i_val >>= 8;
380

381
    } while( i_index > 0 );
382

383
    i_css_varient = pi_css_varients[i_css_varient];
384

385
    intf_WarnMsg( 3, "CSS varient: %d\n", i_css_varient );
386 387 388 389 390 391

    /* 
     * Mangling
     */
    for( i = 5, i_term = 0 ; --i >= 0 ; i_term = pi_scratch[i] )
    {
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        i_index = pi_bits[25+i] ^ pi_scratch[i];
        i_index = pi_css_mangle1[i_index] ^ i_css_varient;
        pi_tmp1[i] = pi_css_mangle2[i_index] ^ i_term;
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    }
    pi_tmp1[4] ^= pi_tmp1[0];
    for( i = 5, i_term = 0 ; --i >= 0 ; i_term = pi_tmp1[i] )
    {
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        i_index = pi_bits[20+i] ^ pi_tmp1[i];
        i_index = pi_css_mangle1[i_index] ^ i_css_varient;
        pi_tmp2[i] = pi_css_mangle2[i_index] ^ i_term;
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    }
    pi_tmp2[4] ^= pi_tmp2[0];
    for( i = 5, i_term = 0 ; --i >= 0 ; i_term = pi_tmp2[i] )
    {
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        i_index = pi_bits[15+i] ^ pi_tmp2[i];
        i_index = pi_css_mangle1[i_index] ^ i_css_varient;
        i_index = pi_css_mangle2[i_index] ^ i_term;
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        pi_tmp1[i] = pi_css_mangle0[i_index];
    }
    pi_tmp1[4] ^= pi_tmp1[0];
    for( i = 5, i_term = 0 ; --i >= 0 ; i_term = pi_tmp1[i] )
    {
414 415 416
        i_index = pi_bits[10+i] ^ pi_tmp1[i];
        i_index = pi_css_mangle1[i_index] ^ i_css_varient;
        i_index = pi_css_mangle2[i_index] ^ i_term;
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        pi_tmp2[i] = pi_css_mangle0[i_index];
    }
    pi_tmp2[4] ^= pi_tmp2[0];
    for( i = 5, i_term = 0 ; --i >= 0 ; i_term = pi_tmp2[i] )
    {
422 423 424
        i_index = pi_bits[5+i] ^ pi_tmp2[i];
        i_index = pi_css_mangle1[i_index] ^ i_css_varient;
        pi_tmp1[i] = pi_css_mangle2[i_index] ^ i_term;
425 426
    }
    pi_tmp1[4] ^= pi_tmp1[0];
427 428

    for( i=5, i_term=0 ; --i>=0 ; i_term=pi_tmp1[i] )
429
    {
430 431 432
        i_index = pi_bits[i] ^ pi_tmp1[i];
        i_index = pi_css_mangle1[i_index] ^ i_css_varient;
        pi_key[i] = pi_css_mangle2[i_index] ^ i_term;
433 434 435 436 437
    }

    return;
}

438
static int CSSAuthHost( dvd_authinfo *ai, disc_t *disc )
439
{
440
    int i;
441

442 443 444 445
    switch( ai->type )
    {
        /* Host data receive (host changes state) */
        case DVD_LU_SEND_AGID:
446

447 448
    	    ai->type = DVD_HOST_SEND_CHALLENGE;
        	break;
449

450
        case DVD_LU_SEND_KEY1:
451

452 453 454 455
            for( i=0; i<KEY_SIZE; i++ )
            {
    	        disc->pi_key1[i] = ai->lsk.key[4-i];
            }
456

457 458 459 460
            for( i=0; i<32; ++i )
            {
                CSSCryptKey( 0, i, disc->pi_challenge,
                                   disc->pi_key_check );
461

462 463 464
        	    if( memcmp( disc->pi_key_check,
                            disc->pi_key1, KEY_SIZE ) == 0 )
                {
465
                    intf_WarnMsg( 3, "CSS: Drive Authentic - using varient %d\n", i);
466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493
                    disc->i_varient = i;
                    ai->type = DVD_LU_SEND_CHALLENGE;
                    break;
                }
            }
//        intf_ErrMsg( "Drive would not Authenticate" );
//        ai->type = DVD_AUTH_FAILURE;
//        return -22;
            break;
    
        case DVD_LU_SEND_CHALLENGE:
        	for( i=0; i<10; ++i )
            {
    	        disc->pi_challenge[i] = ai->hsc.chal[9-i];
            }
    	    CSSCryptKey( 1, disc->i_varient, disc->pi_challenge,
                                             disc->pi_key2 );
        	ai->type = DVD_HOST_SEND_KEY2;
        	break;

        /* Host data send */
        case DVD_HOST_SEND_CHALLENGE:
    	    for( i=0; i<10; ++i )
            {
    		    ai->hsc.chal[9-i] = disc->pi_challenge[i];
            }
    	    /* Returning data, let LU change state */
    	    break;
494

495 496 497 498 499 500 501
        case DVD_HOST_SEND_KEY2:
            for( i=0; i<KEY_SIZE; ++i )
            {
    		    ai->hsk.key[4-i] = disc->pi_key2[i];
            }
            /* Returning data, let LU change state */
            break;
502

503
        default:
504
    	    intf_ErrMsg( "CSS: Got invalid state %d", ai->type );
505 506
            return -22;
    }
507

508
    return 0;
509 510 511 512 513 514 515 516 517 518 519
}

/*****************************************************************************
 * CSSCracker : title key decryption by cracking
 *****************************************************************************/

// FIXME : adapt to vlc
#define KEYSTREAMBYTES 10

static unsigned char invtab4[256];

520 521 522 523 524
static int CSScracker( int StartVal,
                       unsigned char* pCrypted,
                       unsigned char* pDecrypted,
                       DVD_key_t *StreamKey,
                       DVD_key_t *pkey )
525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550
{
    unsigned char MyBuf[10];
    unsigned int t1,t2,t3,t4,t5,t6;
    unsigned int nTry;
    unsigned int vCandidate;
    int i;
    unsigned int j;
    int i_exit = -1;


    for (i=0;i<10;i++)
    {
        MyBuf[i] = pi_css_tab1[pCrypted[i]] ^ pDecrypted[i]; 
    }

    /* Test that CSStab4 is a permutation */
    memset( invtab4, 0, 256 );
    for( i = 0 ; i < 256 ; i++ )
    {
        invtab4[ pi_css_tab4[i] ] = 1; 
    }

    for (i = 0 ; i < 256 ; i++)
    {
        if (invtab4[ i ] != 1)
        {
551
            intf_ErrMsg( "CSS: Permutation error" );
552 553
            exit( -1 );
        }
554
    }
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    /* initialize the inverse of table4 */
    for( i = 0 ; i < 256 ; i++ )
    {
        invtab4[ pi_css_tab4[i] ] = i;
    }

    for( nTry = StartVal ; nTry < 65536 ; nTry++ )
    {
        t1 = nTry >> 8 | 0x100;
        t2 = nTry & 0xff;
        t3 = 0;   /* not needed */
        t5 = 0;

        /* iterate cipher 4 times to reconstruct LFSR2 */
        for( i = 0 ; i < 4 ; i++ )
        {
            /* advance LFSR1 normaly */
            t4=pi_css_tab2[t2]^pi_css_tab3[t1];
            t2=t1>>1;
            t1=((t1&1)<<8)^t4;
            t4=pi_css_tab5[t4];
            /* deduce t6 & t5 */
            t6 = MyBuf[ i ];    
            if( t5 )
            {
                t6 = ( t6 + 0xff )&0x0ff;
            }
            if( t6 < t4 )
            {
                t6 += 0x100;
            }
            t6 -= t4;
            t5 += t6 + t4;
            t6 = invtab4[ t6 ];
            /* feed / advance t3 / t5 */
            t3 = (t3 << 8) | t6;
            t5 >>= 8;
        }

        vCandidate = t3;

        /* iterate 6 more times to validate candidate key */
        for( ; i < KEYSTREAMBYTES ; i++ )
        {
            t4=pi_css_tab2[t2]^pi_css_tab3[t1];
            t2=t1>>1;
            t1=((t1&1)<<8)^t4;
            t4=pi_css_tab5[t4];
            t6=(((((((t3>>3)^t3)>>1)^t3)>>8)^t3)>>5)&0xff;
            t3=(t3<<8)|t6;
            t6=pi_css_tab4[t6];
            t5+=t6+t4;
            if( (t5 & 0xff) != MyBuf[i] ) break;
            t5>>=8;
        }

        if( i == KEYSTREAMBYTES )
        {
            /* Do 4 backwards steps of iterating t3 to deduce initial state */
            t3 = vCandidate;
            for( i = 0 ; i < 4 ; i++ )
            {
                t1 = t3 & 0xff;
                t3 = ( t3 >> 8 );
                /* easy to code, and fast enough bruteforce
                 * search for byte shifted in */
                for( j=0 ; j < 256 ; j++ )
                {
                    t3 = (t3 & 0x1ffff) | ( j << 17 );
                    t6=(((((((t3>>3)^t3)>>1)^t3)>>8)^t3)>>5)&0xff;
                    if( t6 == t1 ) break;  
                }
            }
//          printf( "Candidate: t1=%03x t2=%02x t3=%08x\n", 0x100|(nTry>>8),nTry&0x0ff, t3 );

            t4 = (t3>>1) - 4;
            for(t5=0;t5<8;t5++)
            {
                if ( ((t4+t5)*2 + 8 - ((t4+t5)&7))==t3 )
                {
                    (*pkey)[0] = nTry>>8;
                    (*pkey)[1] = nTry & 0xFF;
                    (*pkey)[2] = ((t4+t5) >> 0) & 0xFF;
                    (*pkey)[3] = ((t4+t5) >> 8) & 0xFF;
                    (*pkey)[4] = ((t4+t5) >> 16) & 0xFF;
                    i_exit = nTry+1;
                }
            }
        }
    }

    if (i_exit>=0)
    {
        (*pkey)[0] ^= (*StreamKey)[0];
        (*pkey)[1] ^= (*StreamKey)[1];
        (*pkey)[2] ^= (*StreamKey)[2];
        (*pkey)[3] ^= (*StreamKey)[3];
        (*pkey)[4] ^= (*StreamKey)[4];
    }

    return i_exit;
}

/*
 * Authentication and keys
 */

663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681
/*****************************************************************************
 * CSSTest : check if the disc is encrypted or not
 *****************************************************************************/
int CSSTest( int i_fd )
{
    dvd_struct dvd;

    dvd.type = DVD_STRUCT_COPYRIGHT;
    dvd.copyright.layer_num = 0;

    if( ioctl( i_fd, DVD_READ_STRUCT, &dvd ) < 0 )
    {
        intf_ErrMsg( "DVD ioctl error" );
        return -1;
    }

    return dvd.copyright.cpst;
}

682 683 684 685 686 687
/*****************************************************************************
 * CSSInit : CSS Structure initialisation and DVD authentication.
 *****************************************************************************/

css_t CSSInit( int i_fd )
{
688 689
    dvd_authinfo    ai;
    dvd_struct      dvd;
690
    css_t           css;
691
    int             rv = -1;
692 693
    int             i;

694 695
    css.i_fd = i_fd;

696 697 698 699 700 701 702 703
    memset( &ai, 0, sizeof(ai) );

//    if (CSSGetASF (i_fd))
//        return css;


    /* Init sequence, request AGID */
    for( i=1; (i<4)&&(rv== -1) ; ++i )
704
    {
705
        intf_WarnMsg( 3, "CSS: Request AGID [%d]...", i );
706 707 708 709 710
        ai.type = DVD_LU_SEND_AGID;
        ai.lsa.agid = 0;
        rv =  ioctl (i_fd, DVD_AUTH, &ai);
        if (rv == -1)
        {
711
            intf_ErrMsg( "CSS: N/A, invalidating" );
712 713 714 715
            ai.type = DVD_INVALIDATE_AGID;
            ai.lsa.agid = 0;
            ioctl( i_fd, DVD_AUTH, &ai );
        }
716
    }
717
    if( rv==-1 )
718
    {
719
        intf_ErrMsg( "CSS: Cannot get AGID\n" );
720 721
    }

722
    for( i=0 ; i<10; ++i )
723
    {
724
        css.disc.pi_challenge[i] = i;
725 726
    }

727 728
    /* Send AGID to host */
    if( CSSAuthHost(&ai, &(css.disc) )<0 )
729
    {
730
        intf_ErrMsg( "CSS Error: Send AGID to host failed" );
731 732 733
        return css;
    }

734 735
    /* Get challenge from host */
    if( CSSAuthHost( &ai, &(css.disc) )<0)
736
    {
737
        intf_ErrMsg( "CSS Error: Get challenge from host failed" );
738 739
        return css;
    }
740
    css.i_agid = ai.lsa.agid;
741

742 743
    /* Send challenge to LU */
    if( ioctl( i_fd, DVD_AUTH, &ai )<0 )
744
    {
745
        intf_ErrMsg( "CSS Error: Send challenge to LU failed ");
746
        return css;
747 748
    }

749 750
    /* Get key1 from LU */
    if( ioctl( i_fd, DVD_AUTH, &ai )<0)
751
    {
752
        intf_ErrMsg( "CSS Error: Get key1 from LU failed ");
753
        return css;
754 755
    }

756 757 758
    /* Send key1 to host */
//    if (_CSSAuthHost(&ai, disc) < 0) {
    if( CSSAuthHost( &ai, &(css.disc) )<0)
759
    {
760
        intf_ErrMsg( "CSS Error: Send key1 to host failed" );
761
        return css;
762
    }
763 764 765

    /* Get challenge from LU */
    if( ioctl( i_fd, DVD_AUTH, &ai)<0 )
766
    {
767
        intf_ErrMsg( "CSS Error: Get challenge from LU failed ");
768
        return css;
769 770
    }

771 772
    /* Send challenge to host */
    if( CSSAuthHost( &ai, &(css.disc) )<0 )
773
    {
774
        intf_ErrMsg( "CSS Error: Send challenge to host failed");
775 776 777
        return css;
    }

778 779 780
    /* Get key2 from host */
    if( CSSAuthHost( &ai, &(css.disc) )<0 )
    {
781
        intf_ErrMsg( "CSS Error: Get key2 from host failed" );
782 783
        return css;
    }
784

785 786 787
    /* Send key2 to LU */
    if( ioctl( i_fd, DVD_AUTH, &ai )<0 )
    {
788
        intf_ErrMsg( "CSS Error: Send key2 to LU failed (expected)" );
789 790
        return css;
    }
791

792 793
    if( ai.type == DVD_AUTH_ESTABLISHED )
    {
794
        intf_WarnMsg( 3, "DVD is authenticated");
795 796 797
    }
    else if( ai.type == DVD_AUTH_FAILURE )
    {
798
        intf_ErrMsg("CSS Error: DVD authentication failed");
799 800
    }

801 802 803 804 805
    memcpy( css.disc.pi_challenge, css.disc.pi_key1, KEY_SIZE );
    memcpy( css.disc.pi_challenge+KEY_SIZE, css.disc.pi_key2, KEY_SIZE );
    CSSCryptKey( 2, css.disc.i_varient,
                    css.disc.pi_challenge,
                    css.disc.pi_key_check );
806

807
        intf_WarnMsg( 3, "CSS: Received Session Key\n" );
808

809 810 811 812
    if( css.i_agid < 0 )
    {
        return css;
    }
813

814 815
//    if (CSSGetASF (i_fd) < 0)
//        return css;
816

817 818 819
    dvd.type = DVD_STRUCT_DISCKEY;
    dvd.disckey.agid = css.i_agid;
    memset( dvd.disckey.value, 0, 2048 );
820

821
    if( ioctl( i_fd, DVD_READ_STRUCT, &dvd )<0 )
822
    {
823
        intf_ErrMsg( "CSS Error: Could not read Disc Key" );
824
        css.b_error = 1;
825
        return css;
826 827
    }

828 829 830 831 832 833 834 835 836 837 838
    for (i=0; i<sizeof dvd.disckey.value; i++)
    {
        dvd.disckey.value[i] ^= css.disc.pi_key_check[4 - (i % KEY_SIZE)];
    }
    memcpy( css.disc.pi_key_check, dvd.disckey.value, 2048 );
//    
//    if (CSSGetASF (i_fd) < 0)
//    {
//        css.b_error = 1;
//        return css;
//    }
839 840 841 842 843 844 845 846 847 848

    return css;
}

/*****************************************************************************
 * CSSGetKeys : get the disc key of the media en the dvd device, and then
 * the title keys.
 * The DVD should have been opened before.
 *****************************************************************************/
#define MaxKeys 1000
849
#define REPEAT  2
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int CSSGetKeys( css_t * p_css )
{
#if 0

    /* 
     * css_auth/libcss method from Derek Fawcus.
     * Get encrypted keys with ioctls and decrypt them
     * with cracked player keys
     */
    dvd_struct      dvd;
    dvd_authinfo    auth;
    int             i, j;
    if( CSSGetASF( p_css->i_fd ) < 0 )
    {
        return 1;
    }

    /* Disk key */
    dvd.type = DVD_STRUCT_DISCKEY;
    dvd.disckey.agid = p_css->i_agid;
    memset( dvd.disckey.value, 0, 2048 );
    
    if( ioctl( p_css->i_fd, DVD_READ_STRUCT, &dvd )<0 )
    {
        intf_ErrMsg( "DVD ioctl error in CSSGetKeys" );
        p_css->b_error = 1;
        return 1;
    }

    for( i=0 ; i<sizeof(dvd.disckey.value) ; i++ )
    {
        dvd.disckey.value[i] ^=
                    p_css->keys.pi_key_check[4 - (i % KEY_SIZE )];
    }

    memcpy( p_css->pi_disc_key, dvd.disckey.value, 2048 );

    if( CSSGetASF( p_css->i_fd ) < 0 )
    {
        return 1;
    }

    /* Title keys */
    auth.type = DVD_LU_SEND_TITLE_KEY;
    auth.lstk.agid = p_css->i_agid;

    for( j=0 ; j<p_css->i_title_nb ; j++ )
    {
        auth.lstk.lba = p_css->p_title_key[j].i_lba;

        if( ioctl( p_css->i_fd, DVD_AUTH, &auth )<0 )
        {
            intf_ErrMsg( "DVD ioctl error in CSSGetKeys" );
            p_css->b_error = 1;
            return 1;
        }
    
        for( i=0 ; i<KEY_SIZE ; ++i )
        {
            auth.lstk.title_key[i] ^=
                    p_css->keys.pi_key_check[4 - (i % KEY_SIZE)];
            memcpy( p_css->p_title_key[j].key, auth.lstk.title_key, KEY_SIZE );
        }
    }

    if( CSSGetASF( p_css->i_fd ) < 0 )
    {
        return 1;
    }

921 922
#endif
#if 1
923 924 925 926 927

    /* 
     * Cracking method from Ethan Hawke.
     * Does not use key tables and ioctls.
     */ 
928 929 930 931
    u8      	pi_buf[0x800] ;
    DVD_key_t   my_key;
    title_key_t title_key[MaxKeys] ;
    int         i_title;
932
    off_t		i_pos = 0;
933 934 935 936 937 938 939 940 941 942 943 944 945
    int         i_bytes_read;
    int         i_best_plen;
    int         i_best_p;
    int         i,j,k;
    int         i_registered_keys = 0 ;
    int         i_total_keys_found = 0 ;
    int    		i_highest=0 ;
    boolean_t   b_encrypted = 0;
    boolean_t   b_stop_scanning = 0 ;

    int         i_fd = p_css->i_fd;

    for( i_title=0 ; i_title<1/*p_css->i_title_nb*/ ; i_title++ )
946
    {
947 948 949
        i_pos = p_css->p_title_key[i_title].i;
        do
        {
950
            i_pos = lseek( i_fd, i_pos, SEEK_SET );
951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008
            i_bytes_read = read( i_fd, pi_buf, 0x800 );
            if( pi_buf[0x14] & 0x30 ) // PES_scrambling_control
            {
                b_encrypted = 1;
                i_best_plen = 0;
                i_best_p = 0;
                for( i=2 ; i<0x30 ; i++ )
                {
                    for( j=i ; (j<0x80) && 
                           (pi_buf[0x7F - (j%i)] == pi_buf[0x7F-j]) ; j++ );
                    if( (j>i_best_plen) && (j>i) )
                    {
                        i_best_plen = j;
                        i_best_p = i;
                    }
                }
                if( (i_best_plen>20) && (i_best_plen / i_best_p >= 2) )
                {
                    i = CSScracker( 0,  &pi_buf[0x80],
                            &pi_buf[0x80 - ( i_best_plen / i_best_p) *i_best_p],
                            (DVD_key_t*)&pi_buf[0x54],
                            &my_key );
                    while( i>=0 )
                    {
                        k = 0;
                        for( j=0 ; j<i_registered_keys ; j++ )
                        {
                            if( memcmp( &(title_key[j].key),
                                        &my_key, sizeof(DVD_key_t) ) == 0 )
                            {
                                title_key[j].i++;
                                i_total_keys_found++;
                                k = 1;
                            }
                        }
                        if( k == 0 )
                        {
                            memcpy( &( title_key[i_registered_keys].key),
                                            &my_key,
                                            sizeof(DVD_key_t) );
                            title_key[i_registered_keys++].i = 1;
                            i_total_keys_found++;
                        }
                        i = CSScracker( i, &pi_buf[0x80],
                            &pi_buf[0x80 -( i_best_plen / i_best_p) *i_best_p],
                            (DVD_key_t*)&pi_buf[0x54], &my_key);
                    }
                    if( i_registered_keys == 1 && title_key[0].i >= REPEAT )
                    {
                        b_stop_scanning = 1;
                    }
                }
            }
            i_pos += i_bytes_read;
        } while( i_bytes_read == 0x800 && !b_stop_scanning);
    
        if( b_stop_scanning)
        {
1009 1010
            intf_WarnMsg( 3,
                "CSS: Found enough occurancies of the same key." );
1011 1012 1013
        }
        if( !b_encrypted )
        {
1014
            intf_WarnMsg( 3, "CSS: This file was _NOT_ encrypted!");
1015 1016 1017 1018
            return(0);
        }
        if( b_encrypted && i_registered_keys == 0 )
        {
1019
            intf_WarnMsg( 3 , "CSS: Unable to determine keys from file.");
1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038
            return(1);
        }
        for( i=0 ; i<i_registered_keys-1 ; i++ )
        {
            for( j=i+1 ; j<i_registered_keys ; j++ )
            {
                if( title_key[j].i > title_key[i].i )
                {
                    memcpy( &my_key, &(title_key[j].key), sizeof(DVD_key_t) );
                    k = title_key[j].i;
                    memcpy( &(title_key[j].key),
                            &(title_key[i].key), sizeof(DVD_key_t) );
                    title_key[j].i = title_key[i].i;
                    memcpy( &(title_key[i].key),&my_key, sizeof(DVD_key_t) );
                    title_key[i].i = k;
                }
            }
        }
        i_highest = 0;
1039 1040
#if 0
        fprintf(stderr, " Key(s) & key probability\n---------------------\n");
1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054
        for( i=0 ; i<i_registered_keys ; i++ )
        {
            fprintf(stderr, "%d) %02X %02X %02X %02X %02X - %3.2f%%\n", i,
                        title_key[i].key[0], title_key[i].key[1],
                        title_key[i].key[2], title_key[i].key[3],
                        title_key[i].key[4],
                        title_key[i].i * 100.0 / i_total_keys_found );
            if( title_key[i_highest].i * 100.0 / i_total_keys_found
                                <= title_key[i].i*100.0 / i_total_keys_found )
            {
                i_highest = i;
            }
        }
        fprintf(stderr, "\n");
1055
#endif
1056 1057 1058 1059 1060
    
        /* The "find the key with the highest probability" code
         * is untested, as I haven't been able to find a VOB that
         * produces multiple keys (RT)
         */
1061 1062
        intf_WarnMsg( 3, "CSS: Title %d key: %02X %02X %02X %02X %02X\n",
                    i_title+1,
1063 1064 1065 1066 1067 1068 1069 1070
                    title_key[i_highest].key[0],
                    title_key[i_highest].key[1],
                    title_key[i_highest].key[2],
                    title_key[i_highest].key[3],
                    title_key[i_highest].key[4] );
    
        memcpy( p_css->p_title_key[i_title].key,
                title_key[i_highest].key, KEY_SIZE );
1071 1072 1073 1074 1075 1076 1077
    }
#endif
    return 0;
}

/*****************************************************************************
 * CSSDescrambleSector
1078 1079 1080
 * ---
 * sec : sector to descramble
 * key : title key for this sector
1081
 *****************************************************************************/
1082
int CSSDescrambleSector( DVD_key_t key, u8* pi_sec )
1083
{
1084 1085 1086 1087
    unsigned int    i_t1, i_t2, i_t3, i_t4, i_t5, i_t6;
    u8*             pi_end = pi_sec + 0x800;

    if( pi_sec[0x14] & 0x30) // PES_scrambling_control
1088
    {
1089 1090 1091 1092
        i_t1 = ((key)[0] ^ pi_sec[0x54]) | 0x100;
        i_t2 = (key)[1] ^ pi_sec[0x55];
        i_t3 = (((key)[2]) | ((key)[3] << 8) |
               ((key)[4] << 16)) ^ ((pi_sec[0x56]) |
1093 1094 1095 1096 1097 1098 1099
               (pi_sec[0x57] << 8) | (pi_sec[0x58] << 16));
        i_t4 = i_t3 & 7;
        i_t3 = i_t3 * 2 + 8 - i_t4;
        pi_sec += 0x80;
        i_t5 = 0;

        while( pi_sec != pi_end )
1100
        {
1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111
            i_t4 = pi_css_tab2[i_t2] ^ pi_css_tab3[i_t1];
            i_t2 = i_t1>>1;
            i_t1 = ( ( i_t1 & 1 ) << 8 ) ^ i_t4;
            i_t4 = pi_css_tab5[i_t4];
            i_t6 = ((((((( i_t3 >> 3 ) ^ i_t3 ) >> 1 ) ^
                                         i_t3 ) >> 8 ) ^ i_t3 ) >> 5) & 0xff;
            i_t3 = (i_t3 << 8 ) | i_t6;
            i_t6 = pi_css_tab4[i_t6];
            i_t5 += i_t6 + i_t4;
            *pi_sec++ = pi_css_tab1[*pi_sec] ^( i_t5 & 0xff );
            i_t5 >>= 8;
1112 1113 1114
        }
    }

1115
    return(0);
1116
}
1117
#endif