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 1.4 2001/02/09 03:51:42 stef 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>
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#ifdef HAVE_IOCTL_H
# include <sys/ioctl.h>
#endif
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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,
72
    0xdd, 0x9d, 0xd5, 0x04, 0x4d, 0x0d, 0x45, 0x94,
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130
    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]=
131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194
{   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]=
197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228
{   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 };
229 230

unsigned char pi_css_tab5[256]=
231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262
{   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 };
263 264 265 266 267 268 269 270 271 272

/*
 * Local functions
 */

/*****************************************************************************
 * CSSGetASF : Get Authentification success flag
 *****************************************************************************/
int CSSGetASF( int i_fd )
{
273
    dvd_authinfo ai;
274

275 276
    ai.type = DVD_LU_SEND_ASF;
    ai.lsasf.asf = 0;
277

278
    for( ai.lsasf.agid = 0 ; ai.lsasf.agid < 4 ; ai.lsasf.agid++ )
279
    {
280
        if( !( ioctl( i_fd, DVD_AUTH, &ai ) ) )
281
        {
282
            intf_Msg("CSS: %sAuthenticated\n", (ai.lsasf.asf) ? "" : "not");
283 284 285
            return 0;
        }
    }
286
    intf_ErrMsg( "CSS Error: GetASF" );
287
    return -1;
288 289 290 291 292 293 294 295 296
}

/*****************************************************************************
 * 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,
297
                         u8 const * pi_challenge, u8* pi_key )
298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313
{
    /* 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 } };
314
    u8      pi_css_secret[5] = { 0xE2, 0xA3, 0x45, 0x10, 0xF4 };
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    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];
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    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
346 347 348 349 350 351 352 353 354 355
     * 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 ) |
356 357 358 359
              ( pi_reverse[( i_lfsr0 >> 8 ) & 0xff] << 9 ) |
              ( pi_reverse[( i_lfsr0 >> 16 ) & 0xff] << 1) |
              ( i_lfsr0 >> 24 );

360 361
    i_lfsr1 = ( pi_reverse[pi_tmp1[4]] << 9 ) | 0x100 |
              ( pi_reverse[pi_tmp1[3]] );
362

363 364
    i_index = sizeof( pi_bits );
    do
365
    {
366
        i_lfsr0_o = ( i_lfsr0 >> 12) ^ ( i_lfsr0 >> 4) ^
367 368
                    ( i_lfsr0 >> 3) ^ i_lfsr0;

369 370 371 372 373 374 375 376 377 378 379 380 381
        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;
382

383
    } while( i_index > 0 );
384

385
    i_css_varient = pi_css_varients[i_css_varient];
386

387
    intf_WarnMsg( 3, "CSS varient: %d\n", i_css_varient );
388 389 390 391 392 393

    /* 
     * Mangling
     */
    for( i = 5, i_term = 0 ; --i >= 0 ; i_term = pi_scratch[i] )
    {
394 395 396
        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;
397 398 399 400
    }
    pi_tmp1[4] ^= pi_tmp1[0];
    for( i = 5, i_term = 0 ; --i >= 0 ; i_term = pi_tmp1[i] )
    {
401 402 403
        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;
404 405 406 407
    }
    pi_tmp2[4] ^= pi_tmp2[0];
    for( i = 5, i_term = 0 ; --i >= 0 ; i_term = pi_tmp2[i] )
    {
408 409 410
        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;
411 412 413 414 415
        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] )
    {
416 417 418
        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;
419 420 421 422 423
        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] )
    {
424 425 426
        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;
427 428
    }
    pi_tmp1[4] ^= pi_tmp1[0];
429 430

    for( i=5, i_term=0 ; --i>=0 ; i_term=pi_tmp1[i] )
431
    {
432 433 434
        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;
435 436 437 438 439
    }

    return;
}

440
static int CSSAuthHost( dvd_authinfo *ai, disc_t *disc )
441
{
442
    int i;
443

444 445 446 447
    switch( ai->type )
    {
        /* Host data receive (host changes state) */
        case DVD_LU_SEND_AGID:
448

449 450
    	    ai->type = DVD_HOST_SEND_CHALLENGE;
        	break;
451

452
        case DVD_LU_SEND_KEY1:
453

454 455 456 457
            for( i=0; i<KEY_SIZE; i++ )
            {
    	        disc->pi_key1[i] = ai->lsk.key[4-i];
            }
458

459 460 461 462
            for( i=0; i<32; ++i )
            {
                CSSCryptKey( 0, i, disc->pi_challenge,
                                   disc->pi_key_check );
463

464 465 466
        	    if( memcmp( disc->pi_key_check,
                            disc->pi_key1, KEY_SIZE ) == 0 )
                {
467
                    intf_WarnMsg( 3, "CSS: Drive Authentic - using varient %d\n", i);
468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495
                    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;
496

497 498 499 500 501 502 503
        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;
504

505
        default:
506
    	    intf_ErrMsg( "CSS: Got invalid state %d", ai->type );
507 508
            return -22;
    }
509

510
    return 0;
511 512 513 514 515 516 517 518 519 520 521
}

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

// FIXME : adapt to vlc
#define KEYSTREAMBYTES 10

static unsigned char invtab4[256];

522 523 524 525 526
static int CSScracker( int StartVal,
                       unsigned char* pCrypted,
                       unsigned char* pDecrypted,
                       DVD_key_t *StreamKey,
                       DVD_key_t *pkey )
527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552
{
    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)
        {
553
            intf_ErrMsg( "CSS: Permutation error" );
554 555
            exit( -1 );
        }
556
    }
557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664

    /* 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
 */

665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683
/*****************************************************************************
 * 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;
}

684 685 686 687 688 689
/*****************************************************************************
 * CSSInit : CSS Structure initialisation and DVD authentication.
 *****************************************************************************/

css_t CSSInit( int i_fd )
{
690 691
    dvd_authinfo    ai;
    dvd_struct      dvd;
692
    css_t           css;
693
    int             rv = -1;
694 695
    int             i;

696 697
    css.i_fd = i_fd;

698 699 700 701 702 703 704 705
    memset( &ai, 0, sizeof(ai) );

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


    /* Init sequence, request AGID */
    for( i=1; (i<4)&&(rv== -1) ; ++i )
706
    {
707
        intf_WarnMsg( 3, "CSS: Request AGID [%d]...", i );
708 709 710 711 712
        ai.type = DVD_LU_SEND_AGID;
        ai.lsa.agid = 0;
        rv =  ioctl (i_fd, DVD_AUTH, &ai);
        if (rv == -1)
        {
713
            intf_ErrMsg( "CSS: N/A, invalidating" );
714 715 716 717
            ai.type = DVD_INVALIDATE_AGID;
            ai.lsa.agid = 0;
            ioctl( i_fd, DVD_AUTH, &ai );
        }
718
    }
719
    if( rv==-1 )
720
    {
721
        intf_ErrMsg( "CSS: Cannot get AGID\n" );
722 723
    }

724
    for( i=0 ; i<10; ++i )
725
    {
726
        css.disc.pi_challenge[i] = i;
727 728
    }

729 730
    /* Send AGID to host */
    if( CSSAuthHost(&ai, &(css.disc) )<0 )
731
    {
732
        intf_ErrMsg( "CSS Error: Send AGID to host failed" );
733 734 735
        return css;
    }

736 737
    /* Get challenge from host */
    if( CSSAuthHost( &ai, &(css.disc) )<0)
738
    {
739
        intf_ErrMsg( "CSS Error: Get challenge from host failed" );
740 741
        return css;
    }
742
    css.i_agid = ai.lsa.agid;
743

744 745
    /* Send challenge to LU */
    if( ioctl( i_fd, DVD_AUTH, &ai )<0 )
746
    {
747
        intf_ErrMsg( "CSS Error: Send challenge to LU failed ");
748
        return css;
749 750
    }

751 752
    /* Get key1 from LU */
    if( ioctl( i_fd, DVD_AUTH, &ai )<0)
753
    {
754
        intf_ErrMsg( "CSS Error: Get key1 from LU failed ");
755
        return css;
756 757
    }

758 759 760
    /* Send key1 to host */
//    if (_CSSAuthHost(&ai, disc) < 0) {
    if( CSSAuthHost( &ai, &(css.disc) )<0)
761
    {
762
        intf_ErrMsg( "CSS Error: Send key1 to host failed" );
763
        return css;
764
    }
765 766 767

    /* Get challenge from LU */
    if( ioctl( i_fd, DVD_AUTH, &ai)<0 )
768
    {
769
        intf_ErrMsg( "CSS Error: Get challenge from LU failed ");
770
        return css;
771 772
    }

773 774
    /* Send challenge to host */
    if( CSSAuthHost( &ai, &(css.disc) )<0 )
775
    {
776
        intf_ErrMsg( "CSS Error: Send challenge to host failed");
777 778 779
        return css;
    }

780 781 782
    /* Get key2 from host */
    if( CSSAuthHost( &ai, &(css.disc) )<0 )
    {
783
        intf_ErrMsg( "CSS Error: Get key2 from host failed" );
784 785
        return css;
    }
786

787 788 789
    /* Send key2 to LU */
    if( ioctl( i_fd, DVD_AUTH, &ai )<0 )
    {
790
        intf_ErrMsg( "CSS Error: Send key2 to LU failed (expected)" );
791 792
        return css;
    }
793

794 795
    if( ai.type == DVD_AUTH_ESTABLISHED )
    {
796
        intf_WarnMsg( 3, "DVD is authenticated");
797 798 799
    }
    else if( ai.type == DVD_AUTH_FAILURE )
    {
800
        intf_ErrMsg("CSS Error: DVD authentication failed");
801 802
    }

803 804 805 806 807
    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 );
808

809
        intf_WarnMsg( 3, "CSS: Received Session Key\n" );
810

811 812 813 814
    if( css.i_agid < 0 )
    {
        return css;
    }
815

816 817
//    if (CSSGetASF (i_fd) < 0)
//        return css;
818

819 820 821
    dvd.type = DVD_STRUCT_DISCKEY;
    dvd.disckey.agid = css.i_agid;
    memset( dvd.disckey.value, 0, 2048 );
822

823
    if( ioctl( i_fd, DVD_READ_STRUCT, &dvd )<0 )
824
    {
825
        intf_ErrMsg( "CSS Error: Could not read Disc Key" );
826
        css.b_error = 1;
827
        return css;
828 829
    }

830 831 832 833 834 835 836 837 838 839 840
    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;
//    }
841 842 843 844 845 846 847 848 849 850

    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
851
#define REPEAT  2
852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922

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;
    }

923 924
#endif
#if 1
925 926 927 928 929

    /* 
     * Cracking method from Ethan Hawke.
     * Does not use key tables and ioctls.
     */ 
930 931 932 933
    u8      	pi_buf[0x800] ;
    DVD_key_t   my_key;
    title_key_t title_key[MaxKeys] ;
    int         i_title;
934
    off_t		i_pos = 0;
935 936 937 938 939 940 941 942 943 944 945 946 947
    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++ )
948
    {
949 950 951
        i_pos = p_css->p_title_key[i_title].i;
        do
        {
952
            i_pos = lseek( i_fd, i_pos, SEEK_SET );
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 1009 1010
            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)
        {
1011 1012
            intf_WarnMsg( 3,
                "CSS: Found enough occurancies of the same key." );
1013 1014 1015
        }
        if( !b_encrypted )
        {
1016
            intf_WarnMsg( 3, "CSS: This file was _NOT_ encrypted!");
1017 1018 1019 1020
            return(0);
        }
        if( b_encrypted && i_registered_keys == 0 )
        {
1021
            intf_WarnMsg( 3 , "CSS: Unable to determine keys from file.");
1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040
            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;
1041 1042
#if 0
        fprintf(stderr, " Key(s) & key probability\n---------------------\n");
1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056
        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");
1057
#endif
1058 1059 1060 1061 1062
    
        /* 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)
         */
1063 1064
        intf_WarnMsg( 3, "CSS: Title %d key: %02X %02X %02X %02X %02X\n",
                    i_title+1,
1065 1066 1067 1068 1069 1070 1071 1072
                    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 );
1073 1074 1075 1076 1077 1078 1079
    }
#endif
    return 0;
}

/*****************************************************************************
 * CSSDescrambleSector
1080 1081 1082
 * ---
 * sec : sector to descramble
 * key : title key for this sector
1083
 *****************************************************************************/
1084
int CSSDescrambleSector( DVD_key_t key, u8* pi_sec )
1085
{
1086 1087 1088 1089
    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
1090
    {
1091 1092 1093 1094
        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]) |
1095 1096 1097 1098 1099 1100 1101
               (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 )
1102
        {
1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113
            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;
1114 1115 1116
        }
    }

1117
    return(0);
1118
}
1119
#endif