dvd_css.c 42.6 KB
Newer Older
1
2
3
4
/*****************************************************************************
 * dvd_css.c: Functions for DVD authentification and unscrambling
 *****************************************************************************
 * Copyright (C) 1999-2001 VideoLAN
5
 * $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
 *****************************************************************************/
27
28
29
30
#include "defs.h"

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

31
32
33
34
35
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <netinet/in.h>
36
#ifdef HAVE_SYS_IOCTL_H
37
38
# include <sys/ioctl.h>
#endif
39
40
41
42
43
44
#ifdef HAVE_SYS_DVDIO_H
# include <sys/dvdio.h>
#endif
#ifdef LINUX_DVD
# include <linux/cdrom.h>
#endif
45
46
47
48

#include "common.h"
#include "intf_msg.h"
#include "dvd_css.h"
49
50
#include "dvd_ifo.h"
#include "input_dvd.h"
51
52
53
54

/*****************************************************************************
 * 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;