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 1.2 2001/02/08 06:41:56 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 <malloc.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,
71
    0xdd, 0x9d, 0xd5, 0x04, 0x4d, 0x0d, 0x45, 0x94,
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129
    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]=
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{   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]=
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{   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 };
228 229

unsigned char pi_css_tab5[256]=
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{   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 };
262 263 264 265 266 267 268 269 270 271

/*
 * Local functions
 */

/*****************************************************************************
 * CSSGetASF : Get Authentification success flag
 *****************************************************************************/
int CSSGetASF( int i_fd )
{
272
    dvd_authinfo ai;
273

274 275
    ai.type = DVD_LU_SEND_ASF;
    ai.lsasf.asf = 0;
276

277
    for( ai.lsasf.agid = 0 ; ai.lsasf.agid < 4 ; ai.lsasf.agid++ )
278
    {
279
        if( !( ioctl( i_fd, DVD_AUTH, &ai ) ) )
280
        {
281
            intf_Msg("CSS: %sAuthenticated\n", (ai.lsasf.asf) ? "" : "not");
282 283 284
            return 0;
        }
    }
285
    intf_ErrMsg( "CSS Error: GetASF" );
286
    return -1;
287 288 289 290 291 292 293 294 295
}

/*****************************************************************************
 * 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,
296
                         u8 const * pi_challenge, u8* pi_key )
297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312
{
    /* 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 } };
313
    u8      pi_css_secret[5] = { 0xE2, 0xA3, 0x45, 0x10, 0xF4 };
314 315 316 317 318 319 320
    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];
321 322 323 324 325 326 327
    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
345 346 347 348 349 350 351 352 353 354
     * 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 ) |
355 356 357 358
              ( pi_reverse[( i_lfsr0 >> 8 ) & 0xff] << 9 ) |
              ( pi_reverse[( i_lfsr0 >> 16 ) & 0xff] << 1) |
              ( i_lfsr0 >> 24 );

359 360
    i_lfsr1 = ( pi_reverse[pi_tmp1[4]] << 9 ) | 0x100 |
              ( pi_reverse[pi_tmp1[3]] );
361

362 363
    i_index = sizeof( pi_bits );
    do
364
    {
365
        i_lfsr0_o = ( i_lfsr0 >> 12) ^ ( i_lfsr0 >> 4) ^
366 367
                    ( i_lfsr0 >> 3) ^ i_lfsr0;

368 369 370 371 372 373 374 375 376 377 378 379 380
        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;
381

382
    } while( i_index > 0 );
383

384
    i_css_varient = pi_css_varients[i_css_varient];
385

386
    intf_WarnMsg( 3, "CSS varient: %d\n", i_css_varient );
387 388 389 390 391 392

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

    for( i=5, i_term=0 ; --i>=0 ; i_term=pi_tmp1[i] )
430
    {
431 432 433
        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;
434 435 436 437 438
    }

    return;
}

439
static int CSSAuthHost( dvd_authinfo *ai, disc_t *disc )
440
{
441
    int i;
442

443 444 445 446
    switch( ai->type )
    {
        /* Host data receive (host changes state) */
        case DVD_LU_SEND_AGID:
447

448 449
    	    ai->type = DVD_HOST_SEND_CHALLENGE;
        	break;
450

451
        case DVD_LU_SEND_KEY1:
452

453 454 455 456
            for( i=0; i<KEY_SIZE; i++ )
            {
    	        disc->pi_key1[i] = ai->lsk.key[4-i];
            }
457

458 459 460 461
            for( i=0; i<32; ++i )
            {
                CSSCryptKey( 0, i, disc->pi_challenge,
                                   disc->pi_key_check );
462

463 464 465
        	    if( memcmp( disc->pi_key_check,
                            disc->pi_key1, KEY_SIZE ) == 0 )
                {
466
                    intf_WarnMsg( 3, "CSS: Drive Authentic - using varient %d\n", i);
467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494
                    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;
495

496 497 498 499 500 501 502
        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;
503

504
        default:
505
    	    intf_ErrMsg( "CSS: Got invalid state %d", ai->type );
506 507
            return -22;
    }
508

509
    return 0;
510 511 512 513 514 515 516 517 518 519 520
}

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

// FIXME : adapt to vlc
#define KEYSTREAMBYTES 10

static unsigned char invtab4[256];

521 522 523 524 525
static int CSScracker( int StartVal,
                       unsigned char* pCrypted,
                       unsigned char* pDecrypted,
                       DVD_key_t *StreamKey,
                       DVD_key_t *pkey )
526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551
{
    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)
        {
552
            intf_ErrMsg( "CSS: Permutation error" );
553 554
            exit( -1 );
        }
555
    }
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

    /* 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
 */

664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682
/*****************************************************************************
 * 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;
}

683 684 685 686 687 688
/*****************************************************************************
 * CSSInit : CSS Structure initialisation and DVD authentication.
 *****************************************************************************/

css_t CSSInit( int i_fd )
{
689 690
    dvd_authinfo    ai;
    dvd_struct      dvd;
691
    css_t           css;
692
    int             rv = -1;
693 694
    int             i;

695 696
    css.i_fd = i_fd;

697 698 699 700 701 702 703 704
    memset( &ai, 0, sizeof(ai) );

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


    /* Init sequence, request AGID */
    for( i=1; (i<4)&&(rv== -1) ; ++i )
705
    {
706
        intf_WarnMsg( 3, "CSS: Request AGID [%d]...", i );
707 708 709 710 711
        ai.type = DVD_LU_SEND_AGID;
        ai.lsa.agid = 0;
        rv =  ioctl (i_fd, DVD_AUTH, &ai);
        if (rv == -1)
        {
712
            intf_ErrMsg( "CSS: N/A, invalidating" );
713 714 715 716
            ai.type = DVD_INVALIDATE_AGID;
            ai.lsa.agid = 0;
            ioctl( i_fd, DVD_AUTH, &ai );
        }
717
    }
718
    if( rv==-1 )
719
    {
720
        intf_ErrMsg( "CSS: Cannot get AGID\n" );
721 722
    }

723
    for( i=0 ; i<10; ++i )
724
    {
725
        css.disc.pi_challenge[i] = i;
726 727
    }

728 729
    /* Send AGID to host */
    if( CSSAuthHost(&ai, &(css.disc) )<0 )
730
    {
731
        intf_ErrMsg( "CSS Error: Send AGID to host failed" );
732 733 734
        return css;
    }

735 736
    /* Get challenge from host */
    if( CSSAuthHost( &ai, &(css.disc) )<0)
737
    {
738
        intf_ErrMsg( "CSS Error: Get challenge from host failed" );
739 740
        return css;
    }
741
    css.i_agid = ai.lsa.agid;
742

743 744
    /* Send challenge to LU */
    if( ioctl( i_fd, DVD_AUTH, &ai )<0 )
745
    {
746
        intf_ErrMsg( "CSS Error: Send challenge to LU failed ");
747
        return css;
748 749
    }

750 751
    /* Get key1 from LU */
    if( ioctl( i_fd, DVD_AUTH, &ai )<0)
752
    {
753
        intf_ErrMsg( "CSS Error: Get key1 from LU failed ");
754
        return css;
755 756
    }

757 758 759
    /* Send key1 to host */
//    if (_CSSAuthHost(&ai, disc) < 0) {
    if( CSSAuthHost( &ai, &(css.disc) )<0)
760
    {
761
        intf_ErrMsg( "CSS Error: Send key1 to host failed" );
762
        return css;
763
    }
764 765 766

    /* Get challenge from LU */
    if( ioctl( i_fd, DVD_AUTH, &ai)<0 )
767
    {
768
        intf_ErrMsg( "CSS Error: Get challenge from LU failed ");
769
        return css;
770 771
    }

772 773
    /* Send challenge to host */
    if( CSSAuthHost( &ai, &(css.disc) )<0 )
774
    {
775
        intf_ErrMsg( "CSS Error: Send challenge to host failed");
776 777 778
        return css;
    }

779 780 781
    /* Get key2 from host */
    if( CSSAuthHost( &ai, &(css.disc) )<0 )
    {
782
        intf_ErrMsg( "CSS Error: Get key2 from host failed" );
783 784
        return css;
    }
785

786 787 788
    /* Send key2 to LU */
    if( ioctl( i_fd, DVD_AUTH, &ai )<0 )
    {
789
        intf_ErrMsg( "CSS Error: Send key2 to LU failed (expected)" );
790 791
        return css;
    }
792

793 794
    if( ai.type == DVD_AUTH_ESTABLISHED )
    {
795
        intf_WarnMsg( 3, "DVD is authenticated");
796 797 798
    }
    else if( ai.type == DVD_AUTH_FAILURE )
    {
799
        intf_ErrMsg("CSS Error: DVD authentication failed");
800 801
    }

802 803 804 805 806
    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 );
807

808
        intf_WarnMsg( 3, "CSS: Received Session Key\n" );
809

810 811 812 813
    if( css.i_agid < 0 )
    {
        return css;
    }
814

815 816
//    if (CSSGetASF (i_fd) < 0)
//        return css;
817

818 819 820
    dvd.type = DVD_STRUCT_DISCKEY;
    dvd.disckey.agid = css.i_agid;
    memset( dvd.disckey.value, 0, 2048 );
821

822
    if( ioctl( i_fd, DVD_READ_STRUCT, &dvd )<0 )
823
    {
824
        intf_ErrMsg( "CSS Error: Could not read Disc Key" );
825
        css.b_error = 1;
826
        return css;
827 828
    }

829 830 831 832 833 834 835 836 837 838 839
    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;
//    }
840 841 842 843 844 845 846 847 848 849

    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
850
#define REPEAT  2
851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921

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;
    }

922 923
#endif
#if 1
924 925 926 927 928

    /* 
     * Cracking method from Ethan Hawke.
     * Does not use key tables and ioctls.
     */ 
929 930 931 932
    u8      	pi_buf[0x800] ;
    DVD_key_t   my_key;
    title_key_t title_key[MaxKeys] ;
    int         i_title;
933
    off64_t		i_pos = 0;
934 935 936 937 938 939 940 941 942 943 944 945 946
    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++ )
947
    {
948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009
        i_pos = p_css->p_title_key[i_title].i;
        do
        {
            i_pos = lseek64( i_fd, i_pos, SEEK_SET );
            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)
        {
1010 1011
            intf_WarnMsg( 3,
                "CSS: Found enough occurancies of the same key." );
1012 1013 1014
        }
        if( !b_encrypted )
        {
1015
            intf_WarnMsg( 3, "CSS: This file was _NOT_ encrypted!");
1016 1017 1018 1019
            return(0);
        }
        if( b_encrypted && i_registered_keys == 0 )
        {
1020
            intf_WarnMsg( 3 , "CSS: Unable to determine keys from file.");
1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039
            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;
1040 1041
#if 0
        fprintf(stderr, " Key(s) & key probability\n---------------------\n");
1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055
        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");
1056
#endif
1057 1058 1059 1060 1061
    
        /* 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)
         */
1062 1063
        intf_WarnMsg( 3, "CSS: Title %d key: %02X %02X %02X %02X %02X\n",
                    i_title+1,
1064 1065 1066 1067 1068 1069 1070 1071
                    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 );
1072 1073 1074 1075 1076 1077 1078
    }
#endif
    return 0;
}

/*****************************************************************************
 * CSSDescrambleSector
1079 1080 1081
 * ---
 * sec : sector to descramble
 * key : title key for this sector
1082
 *****************************************************************************/
1083
int CSSDescrambleSector( DVD_key_t key, u8* pi_sec )
1084
{
1085 1086 1087 1088
    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
1089
    {
1090 1091 1092 1093
        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]) |
1094 1095 1096 1097 1098 1099 1100
               (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 )
1101
        {
1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112
            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;
1113 1114 1115
        }
    }

1116
    return(0);
1117
}
1118
#endif