dvd_css.c 42.6 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 1.8 2001/02/14 04:11:01 stef Exp $
6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
 *
 * 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_SYS_IOCTL_H
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# 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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/*****************************************************************************
 * CSS tables
 *****************************************************************************/
55
static u8 pi_css_tab1[256]=
56 57 58 59 60 61 62 63 64 65
{   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,
66
    0xdd, 0x9d, 0xd5, 0x04, 0x4d, 0x0d, 0x45, 0x94,
67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86
    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,
87 88
    0xba, 0xfa, 0xb2, 0xaf, 0xea, 0xaa, 0xe2, 0xff
};
89

90
static u8 pi_css_tab2[256]=
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
{   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
};

125
static u8 pi_css_tab3[512]=
126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184
{   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,
185 186 187 188 189 190
    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
};
191

192
static u8 pi_css_tab4[256]=
193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223
{   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,
224 225
    0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
};
226

227
static u8 pi_css_tab5[256]=
228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258
{   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,
259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405
    0xe0, 0x60, 0xa0, 0x20, 0xc0, 0x40, 0x80, 0x00
};

/* Mangle tables usesd for key decryption */
static u8 pi_css_mangle0[256] =
{
    0x00, 0x81, 0x03, 0x82, 0x06, 0x87, 0x05, 0x84,
    0x0C, 0x8D, 0x0F, 0x8E, 0x0A, 0x8B, 0x09, 0x88,
    0x18, 0x99, 0x1B, 0x9A, 0x1E, 0x9F, 0x1D, 0x9C,
    0x14, 0x95, 0x17, 0x96, 0x12, 0x93, 0x11, 0x90,
    0x30, 0xB1, 0x33, 0xB2, 0x36, 0xB7, 0x35, 0xB4,
    0x3C, 0xBD, 0x3F, 0xBE, 0x3A, 0xBB, 0x39, 0xB8,
    0x28, 0xA9, 0x2B, 0xAA, 0x2E, 0xAF, 0x2D, 0xAC,
    0x24, 0xA5, 0x27, 0xA6, 0x22, 0xA3, 0x21, 0xA0,
    0x60, 0xE1, 0x63, 0xE2, 0x66, 0xE7, 0x65, 0xE4,
    0x6C, 0xED, 0x6F, 0xEE, 0x6A, 0xEB, 0x69, 0xE8,
    0x78, 0xF9, 0x7B, 0xFA, 0x7E, 0xFF, 0x7D, 0xFC,
    0x74, 0xF5, 0x77, 0xF6, 0x72, 0xF3, 0x71, 0xF0,
    0x50, 0xD1, 0x53, 0xD2, 0x56, 0xD7, 0x55, 0xD4,
    0x5C, 0xDD, 0x5F, 0xDE, 0x5A, 0xDB, 0x59, 0xD8,
    0x48, 0xC9, 0x4B, 0xCA, 0x4E, 0xCF, 0x4D, 0xCC,
    0x44, 0xC5, 0x47, 0xC6, 0x42, 0xC3, 0x41, 0xC0,
    0xC0, 0x41, 0xC3, 0x42, 0xC6, 0x47, 0xC5, 0x44,
    0xCC, 0x4D, 0xCF, 0x4E, 0xCA, 0x4B, 0xC9, 0x48,
    0xD8, 0x59, 0xDB, 0x5A, 0xDE, 0x5F, 0xDD, 0x5C,
    0xD4, 0x55, 0xD7, 0x56, 0xD2, 0x53, 0xD1, 0x50,
    0xF0, 0x71, 0xF3, 0x72, 0xF6, 0x77, 0xF5, 0x74,
    0xFC, 0x7D, 0xFF, 0x7E, 0xFA, 0x7B, 0xF9, 0x78,
    0xE8, 0x69, 0xEB, 0x6A, 0xEE, 0x6F, 0xED, 0x6C,
    0xE4, 0x65, 0xE7, 0x66, 0xE2, 0x63, 0xE1, 0x60,
    0xA0, 0x21, 0xA3, 0x22, 0xA6, 0x27, 0xA5, 0x24,
    0xAC, 0x2D, 0xAF, 0x2E, 0xAA, 0x2B, 0xA9, 0x28,
    0xB8, 0x39, 0xBB, 0x3A, 0xBE, 0x3F, 0xBD, 0x3C,
    0xB4, 0x35, 0xB7, 0x36, 0xB2, 0x33, 0xB1, 0x30,
    0x90, 0x11, 0x93, 0x12, 0x96, 0x17, 0x95, 0x14,
    0x9C, 0x1D, 0x9F, 0x1E, 0x9A, 0x1B, 0x99, 0x18,
    0x88, 0x09, 0x8B, 0x0A, 0x8E, 0x0F, 0x8D, 0x0C,
    0x84, 0x05, 0x87, 0x06, 0x82, 0x03, 0x81, 0x00
    };

static u8 pi_css_mangle1[256] =
{
    0xC4, 0xCD, 0xCE, 0xCB, 0xC8, 0xC9, 0xCA, 0xCF,
    0xCC, 0xC5, 0xC6, 0xC3, 0xC0, 0xC1, 0xC2, 0xC7,
    0x14, 0x1D, 0x1E, 0x1B, 0x18, 0x19, 0x1A, 0x1F,
    0x1C, 0x15, 0x16, 0x13, 0x10, 0x11, 0x12, 0x17,
    0x24, 0x2D, 0x2E, 0x2B, 0x28, 0x29, 0x2A, 0x2F,
    0x2C, 0x25, 0x26, 0x23, 0x20, 0x21, 0x22, 0x27,
    0x34, 0x3D, 0x3E, 0x3B, 0x38, 0x39, 0x3A, 0x3F,
    0x3C, 0x35, 0x36, 0x33, 0x30, 0x31, 0x32, 0x37,
    0x04, 0x0D, 0x0E, 0x0B, 0x08, 0x09, 0x0A, 0x0F,
    0x0C, 0x05, 0x06, 0x03, 0x00, 0x01, 0x02, 0x07,
    0xD4, 0xDD, 0xDE, 0xDB, 0xD8, 0xD9, 0xDA, 0xDF,
    0xDC, 0xD5, 0xD6, 0xD3, 0xD0, 0xD1, 0xD2, 0xD7,
    0xE4, 0xED, 0xEE, 0xEB, 0xE8, 0xE9, 0xEA, 0xEF,
    0xEC, 0xE5, 0xE6, 0xE3, 0xE0, 0xE1, 0xE2, 0xE7,
    0xF4, 0xFD, 0xFE, 0xFB, 0xF8, 0xF9, 0xFA, 0xFF,
    0xFC, 0xF5, 0xF6, 0xF3, 0xF0, 0xF1, 0xF2, 0xF7,
    0x44, 0x4D, 0x4E, 0x4B, 0x48, 0x49, 0x4A, 0x4F,
    0x4C, 0x45, 0x46, 0x43, 0x40, 0x41, 0x42, 0x47,
    0x94, 0x9D, 0x9E, 0x9B, 0x98, 0x99, 0x9A, 0x9F,
    0x9C, 0x95, 0x96, 0x93, 0x90, 0x91, 0x92, 0x97,
    0xA4, 0xAD, 0xAE, 0xAB, 0xA8, 0xA9, 0xAA, 0xAF,
    0xAC, 0xA5, 0xA6, 0xA3, 0xA0, 0xA1, 0xA2, 0xA7,
    0xB4, 0xBD, 0xBE, 0xBB, 0xB8, 0xB9, 0xBA, 0xBF,
    0xBC, 0xB5, 0xB6, 0xB3, 0xB0, 0xB1, 0xB2, 0xB7,
    0x84, 0x8D, 0x8E, 0x8B, 0x88, 0x89, 0x8A, 0x8F,
    0x8C, 0x85, 0x86, 0x83, 0x80, 0x81, 0x82, 0x87,
    0x54, 0x5D, 0x5E, 0x5B, 0x58, 0x59, 0x5A, 0x5F,
    0x5C, 0x55, 0x56, 0x53, 0x50, 0x51, 0x52, 0x57,
    0x64, 0x6D, 0x6E, 0x6B, 0x68, 0x69, 0x6A, 0x6F,
    0x6C, 0x65, 0x66, 0x63, 0x60, 0x61, 0x62, 0x67,
    0x74, 0x7D, 0x7E, 0x7B, 0x78, 0x79, 0x7A, 0x7F,
    0x7C, 0x75, 0x76, 0x73, 0x70, 0x71, 0x72, 0x77
};

static u8 pi_css_mangle2[256] =
{
    0xC4, 0x24, 0x14, 0x34, 0xCE, 0x2E, 0x1E, 0x3E,
    0xCD, 0x2D, 0x1D, 0x3D, 0xCB, 0x2B, 0x1B, 0x3B,
    0x44, 0xA4, 0x94, 0xB4, 0x4E, 0xAE, 0x9E, 0xBE,
    0x4D, 0xAD, 0x9D, 0xBD, 0x4B, 0xAB, 0x9B, 0xBB,
    0x04, 0xE4, 0xD4, 0xF4, 0x0E, 0xEE, 0xDE, 0xFE,
    0x0D, 0xED, 0xDD, 0xFD, 0x0B, 0xEB, 0xDB, 0xFB,
    0x84, 0x64, 0x54, 0x74, 0x8E, 0x6E, 0x5E, 0x7E,
    0x8D, 0x6D, 0x5D, 0x7D, 0x8B, 0x6B, 0x5B, 0x7B,
    0xCC, 0x2C, 0x1C, 0x3C, 0xC6, 0x26, 0x16, 0x36,
    0xC5, 0x25, 0x15, 0x35, 0xC3, 0x23, 0x13, 0x33,
    0x4C, 0xAC, 0x9C, 0xBC, 0x46, 0xA6, 0x96, 0xB6,
    0x45, 0xA5, 0x95, 0xB5, 0x43, 0xA3, 0x93, 0xB3,
    0x0C, 0xEC, 0xDC, 0xFC, 0x06, 0xE6, 0xD6, 0xF6,
    0x05, 0xE5, 0xD5, 0xF5, 0x03, 0xE3, 0xD3, 0xF3,
    0x8C, 0x6C, 0x5C, 0x7C, 0x86, 0x66, 0x56, 0x76,
    0x85, 0x65, 0x55, 0x75, 0x83, 0x63, 0x53, 0x73,
    0xC8, 0x28, 0x18, 0x38, 0xCA, 0x2A, 0x1A, 0x3A,
    0xC9, 0x29, 0x19, 0x39, 0xCF, 0x2F, 0x1F, 0x3F,
    0x48, 0xA8, 0x98, 0xB8, 0x4A, 0xAA, 0x9A, 0xBA,
    0x49, 0xA9, 0x99, 0xB9, 0x4F, 0xAF, 0x9F, 0xBF,
    0x08, 0xE8, 0xD8, 0xF8, 0x0A, 0xEA, 0xDA, 0xFA,
    0x09, 0xE9, 0xD9, 0xF9, 0x0F, 0xEF, 0xDF, 0xFF,
    0x88, 0x68, 0x58, 0x78, 0x8A, 0x6A, 0x5A, 0x7A,
    0x89, 0x69, 0x59, 0x79, 0x8F, 0x6F, 0x5F, 0x7F,
    0xC0, 0x20, 0x10, 0x30, 0xC2, 0x22, 0x12, 0x32,
    0xC1, 0x21, 0x11, 0x31, 0xC7, 0x27, 0x17, 0x37,
    0x40, 0xA0, 0x90, 0xB0, 0x42, 0xA2, 0x92, 0xB2,
    0x41, 0xA1, 0x91, 0xB1, 0x47, 0xA7, 0x97, 0xB7,
    0x00, 0xE0, 0xD0, 0xF0, 0x02, 0xE2, 0xD2, 0xF2,
    0x01, 0xE1, 0xD1, 0xF1, 0x07, 0xE7, 0xD7, 0xF7,
    0x80, 0x60, 0x50, 0x70, 0x82, 0x62, 0x52, 0x72,
    0x81, 0x61, 0x51, 0x71, 0x87, 0x67, 0x57, 0x77
};

static u8 pi_reverse[256] =
{
    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
};
406 407 408 409 410 411 412

/*
 * Local functions
 */

/*****************************************************************************
 * CSSGetASF : Get Authentification success flag
413 414 415 416 417
 * ---
 * Returns :
 *  -1 on ioctl error,
 *  0 if the device needs to be authenticated,
 *  1 either.
418
 *****************************************************************************/
419
static int CSSGetASF( int i_fd )
420
{
421
    dvd_authinfo    auth_info;
422

423 424
    auth_info.type = DVD_LU_SEND_ASF;
    auth_info.lsasf.asf = 0;
425

426 427
    for( auth_info.lsasf.agid = 0 ; auth_info.lsasf.agid < 4 ;
                                                    auth_info.lsasf.agid++ )
428
    {
429
        if( !( ioctl( i_fd, DVD_AUTH, &auth_info ) ) )
430
        {
431 432 433
            intf_WarnMsg( 3, "CSS: %sAuthenticated",
                                    ( auth_info.lsasf.asf ) ? "" : "not " );
            return auth_info.lsasf.asf;
434 435
        }
    }
436 437 438

    /* The ioctl process has failed */
    intf_ErrMsg( "CSS: GetASF Fatal Error" );
439
    return -1;
440 441 442 443
}

/*****************************************************************************
 * CSSCryptKey : shuffles bits and unencrypt keys.
444
 * Used during authentication and disc key negociation in CSSInit.
445 446 447 448 449
 * ---
 * 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,
450
                         u8 const * pi_challenge, u8* pi_key )
451
{
452 453 454
    /* "Secret" key */
    u8      pi_css_secret[5] = { 0xE2, 0xA3, 0x45, 0x10, 0xF4 };

455
    /* Permutation table for challenge */
456
    u8      ppi_perm_challenge[3][10] =
457 458 459
            { { 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 } };
460 461

    /* Permutation table for varient table for key2 and buskey */
462 463 464 465 466 467 468 469 470
    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 } };
471 472

    /* CSS varient for mangling */
473 474 475 476 477 478 479
    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];
480 481 482 483 484 485 486
    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;
487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503
    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
504 505 506 507 508 509
     * 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);

510

511 512 513 514
    /*
     * reverse lfsr0/1 to simplify calculation in loop
     */
    i_lfsr0 = ( pi_reverse[i_lfsr0 & 0xff] << 17 ) |
515 516 517 518
              ( pi_reverse[( i_lfsr0 >> 8 ) & 0xff] << 9 ) |
              ( pi_reverse[( i_lfsr0 >> 16 ) & 0xff] << 1) |
              ( i_lfsr0 >> 24 );

519 520
    i_lfsr1 = ( pi_reverse[pi_tmp1[4]] << 9 ) | 0x100 |
              ( pi_reverse[pi_tmp1[3]] );
521

522
    i_index = sizeof( pi_bits );
523

524
    do
525
    {
526
        i_lfsr0_o = ( i_lfsr0 >> 12) ^ ( i_lfsr0 >> 4) ^
527 528
                    ( i_lfsr0 >> 3) ^ i_lfsr0;

529 530 531 532 533 534 535 536 537 538
        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;
539

540 541
        pi_bits[--i_index] = i_val & 0xFF;
        i_val >>= 8;
542

543
    } while( i_index > 0 );
544

545
    i_css_varient = pi_css_varients[i_css_varient];
546

547
    /*
548 549 550 551
     * Mangling
     */
    for( i = 5, i_term = 0 ; --i >= 0 ; i_term = pi_scratch[i] )
    {
552 553 554
        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;
555 556
    }
    pi_tmp1[4] ^= pi_tmp1[0];
557

558 559
    for( i = 5, i_term = 0 ; --i >= 0 ; i_term = pi_tmp1[i] )
    {
560 561 562
        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;
563 564
    }
    pi_tmp2[4] ^= pi_tmp2[0];
565

566 567
    for( i = 5, i_term = 0 ; --i >= 0 ; i_term = pi_tmp2[i] )
    {
568 569 570
        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;
571 572 573
        pi_tmp1[i] = pi_css_mangle0[i_index];
    }
    pi_tmp1[4] ^= pi_tmp1[0];
574

575 576
    for( i = 5, i_term = 0 ; --i >= 0 ; i_term = pi_tmp1[i] )
    {
577 578 579
        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;
580 581 582
        pi_tmp2[i] = pi_css_mangle0[i_index];
    }
    pi_tmp2[4] ^= pi_tmp2[0];
583

584 585
    for( i = 5, i_term = 0 ; --i >= 0 ; i_term = pi_tmp2[i] )
    {
586 587 588
        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;
589 590
    }
    pi_tmp1[4] ^= pi_tmp1[0];
591 592

    for( i=5, i_term=0 ; --i>=0 ; i_term=pi_tmp1[i] )
593
    {
594 595 596
        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;
597 598 599 600 601 602 603
    }

    return;
}

/*****************************************************************************
 * CSSCracker : title key decryption by cracking
604 605
 * ---
 * This function is called by CSSGetKeys to find a key
606
 *****************************************************************************/
607 608 609 610 611
static int CSSCracker( int i_start,
                       unsigned char * p_crypted,
                       unsigned char * p_decrypted,
                       DVD_key_t * p_sector_key,
                       DVD_key_t * p_key )
612
{
613 614 615 616 617
    unsigned char pi_buffer[10];
    unsigned int i_t1, i_t2, i_t3, i_t4, i_t5, i_t6;
    unsigned int i_try;
    unsigned int i_candidate;
    unsigned int i, j;
618 619 620
    int i_exit = -1;


621
    for( i = 0 ; i < 10 ; i++ )
622
    {
623
        pi_buffer[i] = pi_css_tab1[p_crypted[i]] ^ p_decrypted[i];
624 625
    }

626
    for( i_try = i_start ; i_try < 0x10000 ; i_try++ )
627
    {
628 629 630 631
        i_t1 = i_try >> 8 | 0x100;
        i_t2 = i_try & 0xff;
        i_t3 = 0;               /* not needed */
        i_t5 = 0;
632 633 634 635 636

        /* iterate cipher 4 times to reconstruct LFSR2 */
        for( i = 0 ; i < 4 ; i++ )
        {
            /* advance LFSR1 normaly */
637 638 639 640 641 642 643
            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];
            /* deduce i_t6 & i_t5 */
            i_t6 = pi_buffer[i];
            if( i_t5 )
644
            {
645
                i_t6 = ( i_t6 + 0xff ) & 0x0ff;
646
            }
647
            if( i_t6 < i_t4 )
648
            {
649
                i_t6 += 0x100;
650
            }
651 652 653 654 655 656
            i_t6 -= i_t4;
            i_t5 += i_t6 + i_t4;
            i_t6 = pi_css_tab4[ i_t6 ];
            /* feed / advance i_t3 / i_t5 */
            i_t3 = ( i_t3 << 8 ) | i_t6;
            i_t5 >>= 8;
657 658
        }

659
        i_candidate = i_t3;
660 661

        /* iterate 6 more times to validate candidate key */
662
        for( ; i < 10 ; i++ )
663
        {
664 665 666 667 668 669 670 671 672 673 674 675 676 677 678
            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;
            if( ( i_t5 & 0xff ) != pi_buffer[i] )
            {
                break;
            }

            i_t5 >>= 8;
679 680
        }

681
        if( i == 10 )
682 683
        {
            /* Do 4 backwards steps of iterating t3 to deduce initial state */
684
            i_t3 = i_candidate;
685 686
            for( i = 0 ; i < 4 ; i++ )
            {
687 688
                i_t1 = i_t3 & 0xff;
                i_t3 = ( i_t3 >> 8 );
689 690
                /* easy to code, and fast enough bruteforce
                 * search for byte shifted in */
691
                for( j = 0 ; j < 256 ; j++ )
692
                {
693 694 695 696 697 698 699
                    i_t3 = ( i_t3 & 0x1ffff) | ( j << 17 );
                    i_t6 = ((((((( i_t3 >> 3 ) ^ i_t3 ) >> 1 ) ^
                                   i_t3 ) >> 8 ) ^ i_t3 ) >> 5 ) & 0xff;
                    if( i_t6 == i_t1 )
                    {
                        break;
                    }
700 701 702
                }
            }

703 704
            i_t4 = ( i_t3 >> 1 ) - 4;
            for( i_t5 = 0 ; i_t5 < 8; i_t5++ )
705
            {
706 707
                if( ( ( i_t4 + i_t5 ) * 2 + 8 - ( (i_t4 + i_t5 ) & 7 ) )
                                                                      == i_t3 )
708
                {
709 710 711 712 713 714
                    (*p_key)[0] = i_try>>8;
                    (*p_key)[1] = i_try & 0xFF;
                    (*p_key)[2] = ( ( i_t4 + i_t5 ) >> 0) & 0xFF;
                    (*p_key)[3] = ( ( i_t4 + i_t5 ) >> 8) & 0xFF;
                    (*p_key)[4] = ( ( i_t4 + i_t5 ) >> 16) & 0xFF;
                    i_exit = i_try + 1;
715 716 717 718 719
                }
            }
        }
    }

720
    if( i_exit >= 0 )
721
    {
722 723 724 725 726
        (*p_key)[0] ^= (*p_sector_key)[0];
        (*p_key)[1] ^= (*p_sector_key)[1];
        (*p_key)[2] ^= (*p_sector_key)[2];
        (*p_key)[3] ^= (*p_sector_key)[3];
        (*p_key)[4] ^= (*p_sector_key)[4];
727 728 729 730 731 732 733 734 735
    }

    return i_exit;
}

/*
 * Authentication and keys
 */

736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754
/*****************************************************************************
 * 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;
}

755 756
/*****************************************************************************
 * CSSInit : CSS Structure initialisation and DVD authentication.
757 758 759 760
 * It simulates the mutual authentication between logical unit and host.
 * ---
 * Since we don't need the disc key to find the title key, we just run the
 * basic unavoidable commands to authenticate device and disc.
761 762 763 764
 *****************************************************************************/

css_t CSSInit( int i_fd )
{
765 766
    /* structures defined in cdrom.h or dvdio.h */
    dvd_authinfo    auth_info;
767
    dvd_struct      dvd;
768

769
    css_t           css;
770
    int             i_error = -1;
771 772
    int             i;

773
    css.i_fd = i_fd;
774
    css.b_error = 0;
775

776
    memset( &auth_info, 0, sizeof(auth_info) );
777

778 779 780 781 782 783 784 785 786 787
    /* Test authentication success */
    switch( CSSGetASF( i_fd ) )
    {
    case -1:
        css.b_error = 1;
    case 1:
        return css;
    case 0:
        intf_WarnMsg( 3, "CSS: Authenticating" );
    }
788 789

    /* Init sequence, request AGID */
790
    for( i = 1; i < 4 ; ++i )
791
    {
792 793 794 795 796
        intf_WarnMsg( 3, "CSS: Request AGID %d", i );
        auth_info.type = DVD_LU_SEND_AGID;
        auth_info.lsa.agid = 0;
        i_error =  ioctl( i_fd, DVD_AUTH, &auth_info );
        if( i_error != -1 )
797
        {
798 799 800
            /* No error during ioctl: we know if device
             * is authenticated */
            break;
801
        }
802 803 804 805 806

        intf_ErrMsg( "CSS: AGID N/A, invalidating" );
        auth_info.type = DVD_INVALIDATE_AGID;
        auth_info.lsa.agid = 0;
        ioctl( i_fd, DVD_AUTH, &auth_info );
807
    }
808 809 810

    /* Unable to authenticate without AGID */
    if( i_error == -1 )
811
    {
812 813 814
        css.b_error = 1;
        intf_ErrMsg( "CSS: Cannot get AGID" );
        return css;
815 816
    }

817
    for( i = 0 ; i < 10; ++i )
818
    {
819
        css.disc.pi_challenge[i] = i;
820 821
    }

822
    /* Send AGID to host */
823
    auth_info.type = DVD_HOST_SEND_CHALLENGE;
824

825
    /* Get challenge from host */
826
    for( i = 0 ; i < 10 ; ++i )
827
    {
828
        auth_info.hsc.chal[9-i] = css.disc.pi_challenge[i];
829
    }
830 831
    /* Returning data, let LU change state */
    css.i_agid = auth_info.lsa.agid;
832

833
    /* Send challenge to LU */
834
    if( ioctl( i_fd, DVD_AUTH, &auth_info )<0 )
835
    {
836 837
        intf_ErrMsg( "CSS: Send challenge to LU failed ");
        css.b_error = 1;
838
        return css;
839 840
    }

841
    /* Get key1 from LU */
842
    if( ioctl( i_fd, DVD_AUTH, &auth_info ) < 0)
843
    {
844 845
        intf_ErrMsg( "CSS: Get key1 from LU failed ");
        css.b_error = 1;
846
        return css;
847 848
    }

849
    /* Send key1 to host */
850
    for( i = 0 ; i < KEY_SIZE ; i++ )
851
    {
852
        css.disc.pi_key1[i] = auth_info.lsk.key[4-i];
853 854 855 856 857 858 859
    }

    for( i = 0 ; i < 32 ; ++i )
    {
        CSSCryptKey( 0, i, css.disc.pi_challenge,
                           css.disc.pi_key_check );

860
        if( memcmp( css.disc.pi_key_check,
861 862 863 864 865 866 867 868 869 870 871 872 873 874
                    css.disc.pi_key1, KEY_SIZE ) == 0 )
        {
            intf_WarnMsg( 3, "CSS: Drive Authentic - using varient %d", i);
            css.disc.i_varient = i;
            auth_info.type = DVD_LU_SEND_CHALLENGE;
            break;
        }
    }

    if( i == 32 )
    {
        intf_ErrMsg( "Drive would not Authenticate" );
        auth_info.type = DVD_AUTH_FAILURE;
        css.b_error = 1;
875
        return css;
876
    }
877 878

    /* Get challenge from LU */
879
    if( ioctl( i_fd, DVD_AUTH, &auth_info ) < 0 )
880
    {
881 882
        intf_ErrMsg( "CSS: Get challenge from LU failed ");
        css.b_error = 1;
883
        return css;
884 885
    }

886
    /* Send challenge to host */
887
    for( i = 0 ; i < 10 ; ++i )
888
    {
889
        css.disc.pi_challenge[i] = auth_info.hsc.chal[9-i];
890 891
    }

892 893
    CSSCryptKey( 1, css.disc.i_varient, css.disc.pi_challenge,
                                                    css.disc.pi_key2 );
894
    auth_info.type = DVD_HOST_SEND_KEY2;
895

896
    /* Get key2 from host */
897
    for( i = 0 ; i < KEY_SIZE ; ++i )
898
    {
899
        auth_info.hsk.key[4-i] = css.disc.pi_key2[i];
900
    }
901
    /* Returning data, let LU change state */
902

903
    /* Send key2 to LU */
904
    if( ioctl( i_fd, DVD_AUTH, &auth_info ) < 0 )
905
    {
906
        intf_ErrMsg( "CSS: Send key2 to LU failed (expected)" );
907 908
        return css;
    }
909

910
    if( auth_info.type == DVD_AUTH_ESTABLISHED )
911
    {
912
        intf_WarnMsg( 3, "CSS: Authentication established");
913
    }
914
    else if( auth_info.type == DVD_AUTH_FAILURE )
915
    {
916 917
        css.b_error = 1;
        intf_ErrMsg("CSS: DVD authentication failed");
918 919
    }

920 921 922 923 924
    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 );
925

926
    intf_WarnMsg( 1, "CSS: Received Session Key" );
927

928 929
    if( css.i_agid < 0 )
    {
930
        css.b_error = 1;
931 932
        return css;
    }
933

934 935 936 937 938 939 940 941 942 943
    /* Test authentication success */
    switch( CSSGetASF( i_fd ) )
    {
    case -1:
        css.b_error = 1;
    case 1:
        return css;
    case 0:
        intf_WarnMsg( 3, "CSS: Getting disc key" );
    }
944

945
    /* Get encrypted disc key */
946 947 948
    dvd.type = DVD_STRUCT_DISCKEY;
    dvd.disckey.agid = css.i_agid;
    memset( dvd.disckey.value, 0, 2048 );
949

950
    if( ioctl( i_fd, DVD_READ_STRUCT, &dvd ) < 0 )
951
    {
952
        intf_ErrMsg( "CSS: Could not read Disc Key" );
953
        css.b_error = 1;
954
        return css;
955
    }
956
#if 1
957 958
    /* Unencrypt disc key using bus key */
    for( i = 0 ; i < sizeof(dvd.disckey.value) ; i++ )
959 960 961 962
    {
        dvd.disckey.value[i] ^= css.disc.pi_key_check[4 - (i % KEY_SIZE)];
    }
    memcpy( css.disc.pi_key_check, dvd.disckey.value, 2048 );
963 964 965 966 967 968 969 970 971 972
#endif
    /* Test authentication success */
    switch( CSSGetASF( i_fd ) )
    {
    case -1:
    case 0:
        css.b_error = 1;
    case 1:
        return css;
    }
973 974 975 976 977

    return css;
}

/*****************************************************************************
978 979
 * CSSGetKeys : get the title keys.
 * The DVD should have been opened and authenticated before.
980 981 982
 *****************************************************************************/
int CSSGetKeys( css_t * p_css )
{
983 984 985 986
    /*
     * Title key cracking method from Ethan Hawke,
     * with Frank A. Stevenson algorithm.
     * Does not use any player key table and ioctls.
987
     */
988 989 990 991 992 993
    u8          pi_buf[0x800] ;
    DVD_key_t   key;
    title_key_t p_title_key[10] ;
    off_t       i_pos;
    boolean_t   b_encrypted;
    boolean_t   b_stop_scanning;
994
    int         i_title;
995 996 997
    int         i_bytes_read;
    int         i_best_plen;
    int         i_best_p;
998 999 1000
    int         i_registered_keys;
    int         i_total_keys_found;
    int         i_highest;
1001
    int         i,j,k;
1002

1003
    for( i_title = 0 ; i_title < 1/*p_css->i_title_nb*/ ; i_title++ )
1004
    {
1005 1006 1007 1008 1009 1010 1011 1012 1013 1014
        /* Initialization for each title */
        memset( p_title_key, 0, 10 );
        memset( &key, 0, 10 );
        b_encrypted = 0;
        b_stop_scanning = 0;
        i_registered_keys = 0 ;
        i_total_keys_found = 0 ;
        i_highest = 0;

        /* Position of the title on the disc */
1015
        i_pos = p_css->p_title_key[i_title].i;
1016

1017 1018
//fprintf( stderr, "CSS %d start pos: %lld\n", i_title, i_pos );

1019
        do {
1020 1021
        i_pos = lseek( p_css->i_fd, i_pos, SEEK_SET );
        i_bytes_read = read( p_css->i_fd, pi_buf, 0x800 );
1022 1023 1024

        /* PES_scrambling_control */
        if( pi_buf[0x14] & 0x30 )
1025
        {
1026 1027 1028 1029 1030
            b_encrypted = 1;
            i_best_plen = 0;
            i_best_p = 0;

            for( i = 2 ; i < 0x30 ; i++ )