/***************************************************************************** * dvd_css.c: Functions for DVD authentification and unscrambling ***************************************************************************** * Copyright (C) 1999-2001 VideoLAN * $Id: dvd_css.c,v 1.10 2001/02/18 01:42:04 stef Exp $ * * Author: Stéphane Borel * * based on: * - css-auth by Derek Fawcus * - DVD CSS ioctls example program by Andrew T. Veliath * - The Divide and conquer attack by Frank A. Stevenson * - DeCSSPlus by Ethan Hawke * - DecVOB * see http://www.lemuria.org/DeCSS/ by Tom Vogt for more information. * * 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 *****************************************************************************/ #include "defs.h" #if defined( HAVE_SYS_DVDIO_H ) || defined( LINUX_DVD ) #include #include #include #include #include #ifdef HAVE_SYS_IOCTL_H # include #endif #ifdef HAVE_SYS_DVDIO_H # include #endif #ifdef LINUX_DVD # include #endif #include "common.h" #include "intf_msg.h" #include "dvd_css.h" #include "dvd_ifo.h" #include "input_dvd.h" /***************************************************************************** * CSS tables *****************************************************************************/ static u8 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, 0xdd, 0x9d, 0xd5, 0x04, 0x4d, 0x0d, 0x45, 0x94, 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 }; static u8 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 }; static u8 pi_css_tab3[512]= { 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff, 0x00, 0x24, 0x49, 0x6d, 0x92, 0xb6, 0xdb, 0xff }; static u8 pi_css_tab4[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 }; static u8 pi_css_tab5[256]= { 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 }; static u8 pi_crypt_tab0[256] = { 0xB7, 0xF4, 0x82, 0x57, 0xDA, 0x4D, 0xDB, 0xE2, 0x2F, 0x52, 0x1A, 0xA8, 0x68, 0x5A, 0x8A, 0xFF, 0xFB, 0x0E, 0x6D, 0x35, 0xF7, 0x5C, 0x76, 0x12, 0xCE, 0x25, 0x79, 0x29, 0x39, 0x62, 0x08, 0x24, 0xA5, 0x85, 0x7B, 0x56, 0x01, 0x23, 0x68, 0xCF, 0x0A, 0xE2, 0x5A, 0xED, 0x3D, 0x59, 0xB0, 0xA9, 0xB0, 0x2C, 0xF2, 0xB8, 0xEF, 0x32, 0xA9, 0x40, 0x80, 0x71, 0xAF, 0x1E, 0xDE, 0x8F, 0x58, 0x88, 0xB8, 0x3A, 0xD0, 0xFC, 0xC4, 0x1E, 0xB5, 0xA0, 0xBB, 0x3B, 0x0F, 0x01, 0x7E, 0x1F, 0x9F, 0xD9, 0xAA, 0xB8, 0x3D, 0x9D, 0x74, 0x1E, 0x25, 0xDB, 0x37, 0x56, 0x8F, 0x16, 0xBA, 0x49, 0x2B, 0xAC, 0xD0, 0xBD, 0x95, 0x20, 0xBE, 0x7A, 0x28, 0xD0, 0x51, 0x64, 0x63, 0x1C, 0x7F, 0x66, 0x10, 0xBB, 0xC4, 0x56, 0x1A, 0x04, 0x6E, 0x0A, 0xEC, 0x9C, 0xD6, 0xE8, 0x9A, 0x7A, 0xCF, 0x8C, 0xDB, 0xB1, 0xEF, 0x71, 0xDE, 0x31, 0xFF, 0x54, 0x3E, 0x5E, 0x07, 0x69, 0x96, 0xB0, 0xCF, 0xDD, 0x9E, 0x47, 0xC7, 0x96, 0x8F, 0xE4, 0x2B, 0x59, 0xC6, 0xEE, 0xB9, 0x86, 0x9A, 0x64, 0x84, 0x72, 0xE2, 0x5B, 0xA2, 0x96, 0x58, 0x99, 0x50, 0x03, 0xF5, 0x38, 0x4D, 0x02, 0x7D, 0xE7, 0x7D, 0x75, 0xA7, 0xB8, 0x67, 0x87, 0x84, 0x3F, 0x1D, 0x11, 0xE5, 0xFC, 0x1E, 0xD3, 0x83, 0x16, 0xA5, 0x29, 0xF6, 0xC7, 0x15, 0x61, 0x29, 0x1A, 0x43, 0x4F, 0x9B, 0xAF, 0xC5, 0x87, 0x34, 0x6C, 0x0F, 0x3B, 0xA8, 0x1D, 0x45, 0x58, 0x25, 0xDC, 0xA8, 0xA3, 0x3B, 0xD1, 0x79, 0x1B, 0x48, 0xF2, 0xE9, 0x93, 0x1F, 0xFC, 0xDB, 0x2A, 0x90, 0xA9, 0x8A, 0x3D, 0x39, 0x18, 0xA3, 0x8E, 0x58, 0x6C, 0xE0, 0x12, 0xBB, 0x25, 0xCD, 0x71, 0x22, 0xA2, 0x64, 0xC6, 0xE7, 0xFB, 0xAD, 0x94, 0x77, 0x04, 0x9A, 0x39, 0xCF, 0x7C}; static u8 pi_crypt_tab1[256] = { 0x8C, 0x47, 0xB0, 0xE1, 0xEB, 0xFC, 0xEB, 0x56, 0x10, 0xE5, 0x2C, 0x1A, 0x5D, 0xEF, 0xBE, 0x4F, 0x08, 0x75, 0x97, 0x4B, 0x0E, 0x25, 0x8E, 0x6E, 0x39, 0x5A, 0x87, 0x53, 0xC4, 0x1F, 0xF4, 0x5C, 0x4E, 0xE6, 0x99, 0x30, 0xE0, 0x42, 0x88, 0xAB, 0xE5, 0x85, 0xBC, 0x8F, 0xD8, 0x3C, 0x54, 0xC9, 0x53, 0x47, 0x18, 0xD6, 0x06, 0x5B, 0x41, 0x2C, 0x67, 0x1E, 0x41, 0x74, 0x33, 0xE2, 0xB4, 0xE0, 0x23, 0x29, 0x42, 0xEA, 0x55, 0x0F, 0x25, 0xB4, 0x24, 0x2C, 0x99, 0x13, 0xEB, 0x0A, 0x0B, 0xC9, 0xF9, 0x63, 0x67, 0x43, 0x2D, 0xC7, 0x7D, 0x07, 0x60, 0x89, 0xD1, 0xCC, 0xE7, 0x94, 0x77, 0x74, 0x9B, 0x7E, 0xD7, 0xE6, 0xFF, 0xBB, 0x68, 0x14, 0x1E, 0xA3, 0x25, 0xDE, 0x3A, 0xA3, 0x54, 0x7B, 0x87, 0x9D, 0x50, 0xCA, 0x27, 0xC3, 0xA4, 0x50, 0x91, 0x27, 0xD4, 0xB0, 0x82, 0x41, 0x97, 0x79, 0x94, 0x82, 0xAC, 0xC7, 0x8E, 0xA5, 0x4E, 0xAA, 0x78, 0x9E, 0xE0, 0x42, 0xBA, 0x28, 0xEA, 0xB7, 0x74, 0xAD, 0x35, 0xDA, 0x92, 0x60, 0x7E, 0xD2, 0x0E, 0xB9, 0x24, 0x5E, 0x39, 0x4F, 0x5E, 0x63, 0x09, 0xB5, 0xFA, 0xBF, 0xF1, 0x22, 0x55, 0x1C, 0xE2, 0x25, 0xDB, 0xC5, 0xD8, 0x50, 0x03, 0x98, 0xC4, 0xAC, 0x2E, 0x11, 0xB4, 0x38, 0x4D, 0xD0, 0xB9, 0xFC, 0x2D, 0x3C, 0x08, 0x04, 0x5A, 0xEF, 0xCE, 0x32, 0xFB, 0x4C, 0x92, 0x1E, 0x4B, 0xFB, 0x1A, 0xD0, 0xE2, 0x3E, 0xDA, 0x6E, 0x7C, 0x4D, 0x56, 0xC3, 0x3F, 0x42, 0xB1, 0x3A, 0x23, 0x4D, 0x6E, 0x84, 0x56, 0x68, 0xF4, 0x0E, 0x03, 0x64, 0xD0, 0xA9, 0x92, 0x2F, 0x8B, 0xBC, 0x39, 0x9C, 0xAC, 0x09, 0x5E, 0xEE, 0xE5, 0x97, 0xBF, 0xA5, 0xCE, 0xFA, 0x28, 0x2C, 0x6D, 0x4F, 0xEF, 0x77, 0xAA, 0x1B, 0x79, 0x8E, 0x97, 0xB4, 0xC3, 0xF4}; static u8 pi_crypt_tab2[256] = { 0xB7, 0x75, 0x81, 0xD5, 0xDC, 0xCA, 0xDE, 0x66, 0x23, 0xDF, 0x15, 0x26, 0x62, 0xD1, 0x83, 0x77, 0xE3, 0x97, 0x76, 0xAF, 0xE9, 0xC3, 0x6B, 0x8E, 0xDA, 0xB0, 0x6E, 0xBF, 0x2B, 0xF1, 0x19, 0xB4, 0x95, 0x34, 0x48, 0xE4, 0x37, 0x94, 0x5D, 0x7B, 0x36, 0x5F, 0x65, 0x53, 0x07, 0xE2, 0x89, 0x11, 0x98, 0x85, 0xD9, 0x12, 0xC1, 0x9D, 0x84, 0xEC, 0xA4, 0xD4, 0x88, 0xB8, 0xFC, 0x2C, 0x79, 0x28, 0xD8, 0xDB, 0xB3, 0x1E, 0xA2, 0xF9, 0xD0, 0x44, 0xD7, 0xD6, 0x60, 0xEF, 0x14, 0xF4, 0xF6, 0x31, 0xD2, 0x41, 0x46, 0x67, 0x0A, 0xE1, 0x58, 0x27, 0x43, 0xA3, 0xF8, 0xE0, 0xC8, 0xBA, 0x5A, 0x5C, 0x80, 0x6C, 0xC6, 0xF2, 0xE8, 0xAD, 0x7D, 0x04, 0x0D, 0xB9, 0x3C, 0xC2, 0x25, 0xBD, 0x49, 0x63, 0x8C, 0x9F, 0x51, 0xCE, 0x20, 0xC5, 0xA1, 0x50, 0x92, 0x2D, 0xDD, 0xBC, 0x8D, 0x4F, 0x9A, 0x71, 0x2F, 0x30, 0x1D, 0x73, 0x39, 0x13, 0xFB, 0x1A, 0xCB, 0x24, 0x59, 0xFE, 0x05, 0x96, 0x57, 0x0F, 0x1F, 0xCF, 0x54, 0xBE, 0xF5, 0x06, 0x1B, 0xB2, 0x6D, 0xD3, 0x4D, 0x32, 0x56, 0x21, 0x33, 0x0B, 0x52, 0xE7, 0xAB, 0xEB, 0xA6, 0x74, 0x00, 0x4C, 0xB1, 0x7F, 0x82, 0x99, 0x87, 0x0E, 0x5E, 0xC0, 0x8F, 0xEE, 0x6F, 0x55, 0xF3, 0x7E, 0x08, 0x90, 0xFA, 0xB6, 0x64, 0x70, 0x47, 0x4A, 0x17, 0xA7, 0xB5, 0x40, 0x8A, 0x38, 0xE5, 0x68, 0x3E, 0x8B, 0x69, 0xAA, 0x9B, 0x42, 0xA5, 0x10, 0x01, 0x35, 0xFD, 0x61, 0x9E, 0xE6, 0x16, 0x9C, 0x86, 0xED, 0xCD, 0x2E, 0xFF, 0xC4, 0x5B, 0xA0, 0xAE, 0xCC, 0x4B, 0x3B, 0x03, 0xBB, 0x1C, 0x2A, 0xAC, 0x0C, 0x3F, 0x93, 0xC7, 0x72, 0x7A, 0x09, 0x22, 0x3D, 0x45, 0x78, 0xA9, 0xA8, 0xEA, 0xC9, 0x6A, 0xF7, 0x29, 0x91, 0xF0, 0x02, 0x18, 0x3A, 0x4E, 0x7C}; static u8 pi_crypt_tab3[288] = { 0x73, 0x51, 0x95, 0xE1, 0x12, 0xE4, 0xC0, 0x58, 0xEE, 0xF2, 0x08, 0x1B, 0xA9, 0xFA, 0x98, 0x4C, 0xA7, 0x33, 0xE2, 0x1B, 0xA7, 0x6D, 0xF5, 0x30, 0x97, 0x1D, 0xF3, 0x02, 0x60, 0x5A, 0x82, 0x0F, 0x91, 0xD0, 0x9C, 0x10, 0x39, 0x7A, 0x83, 0x85, 0x3B, 0xB2, 0xB8, 0xAE, 0x0C, 0x09, 0x52, 0xEA, 0x1C, 0xE1, 0x8D, 0x66, 0x4F, 0xF3, 0xDA, 0x92, 0x29, 0xB9, 0xD5, 0xC5, 0x77, 0x47, 0x22, 0x53, 0x14, 0xF7, 0xAF, 0x22, 0x64, 0xDF, 0xC6, 0x72, 0x12, 0xF3, 0x75, 0xDA, 0xD7, 0xD7, 0xE5, 0x02, 0x9E, 0xED, 0xDA, 0xDB, 0x4C, 0x47, 0xCE, 0x91, 0x06, 0x06, 0x6D, 0x55, 0x8B, 0x19, 0xC9, 0xEF, 0x8C, 0x80, 0x1A, 0x0E, 0xEE, 0x4B, 0xAB, 0xF2, 0x08, 0x5C, 0xE9, 0x37, 0x26, 0x5E, 0x9A, 0x90, 0x00, 0xF3, 0x0D, 0xB2, 0xA6, 0xA3, 0xF7, 0x26, 0x17, 0x48, 0x88, 0xC9, 0x0E, 0x2C, 0xC9, 0x02, 0xE7, 0x18, 0x05, 0x4B, 0xF3, 0x39, 0xE1, 0x20, 0x02, 0x0D, 0x40, 0xC7, 0xCA, 0xB9, 0x48, 0x30, 0x57, 0x67, 0xCC, 0x06, 0xBF, 0xAC, 0x81, 0x08, 0x24, 0x7A, 0xD4, 0x8B, 0x19, 0x8E, 0xAC, 0xB4, 0x5A, 0x0F, 0x73, 0x13, 0xAC, 0x9E, 0xDA, 0xB6, 0xB8, 0x96, 0x5B, 0x60, 0x88, 0xE1, 0x81, 0x3F, 0x07, 0x86, 0x37, 0x2D, 0x79, 0x14, 0x52, 0xEA, 0x73, 0xDF, 0x3D, 0x09, 0xC8, 0x25, 0x48, 0xD8, 0x75, 0x60, 0x9A, 0x08, 0x27, 0x4A, 0x2C, 0xB9, 0xA8, 0x8B, 0x8A, 0x73, 0x62, 0x37, 0x16, 0x02, 0xBD, 0xC1, 0x0E, 0x56, 0x54, 0x3E, 0x14, 0x5F, 0x8C, 0x8F, 0x6E, 0x75, 0x1C, 0x07, 0x39, 0x7B, 0x4B, 0xDB, 0xD3, 0x4B, 0x1E, 0xC8, 0x7E, 0xFE, 0x3E, 0x72, 0x16, 0x83, 0x7D, 0xEE, 0xF5, 0xCA, 0xC5, 0x18, 0xF9, 0xD8, 0x68, 0xAB, 0x38, 0x85, 0xA8, 0xF0, 0xA1, 0x73, 0x9F, 0x5D, 0x19, 0x0B, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x33, 0x72, 0x39, 0x25, 0x67, 0x26, 0x6D, 0x71, 0x36, 0x77, 0x3C, 0x20, 0x62, 0x23, 0x68, 0x74, 0xC3, 0x82, 0xC9, 0x15, 0x57, 0x16, 0x5D, 0x81}; /* * Local functions */ /***************************************************************************** * CSSGetASF : Get Authentification success flag * --- * Returns : * -1 on ioctl error, * 0 if the device needs to be authenticated, * 1 either. *****************************************************************************/ static int CSSGetASF( int i_fd ) { dvd_authinfo auth_info; auth_info.type = DVD_LU_SEND_ASF; auth_info.lsasf.asf = 0; for( auth_info.lsasf.agid = 0 ; auth_info.lsasf.agid < 4 ; auth_info.lsasf.agid++ ) { if( !( ioctl( i_fd, DVD_AUTH, &auth_info ) ) ) { intf_WarnMsg( 3, "CSS: %sAuthenticated", ( auth_info.lsasf.asf ) ? "" : "not " ); return auth_info.lsasf.asf; } } /* The ioctl process has failed */ intf_ErrMsg( "CSS: GetASF Fatal Error" ); return -1; } /***************************************************************************** * CSSCryptKey : shuffles bits and unencrypt keys. * Used during authentication and disc key negociation in CSSInit. * --- * 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, u8 const * pi_challenge, u8* pi_key ) { /* 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 for key2 and buskey */ 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 } }; u8 pi_varients[32] = { 0xB7, 0x74, 0x85, 0xD0, 0xCC, 0xDB, 0xCA, 0x73, 0x03, 0xFE, 0x31, 0x03, 0x52, 0xE0, 0xB7, 0x42, 0x63, 0x16, 0xF2, 0x2A, 0x79, 0x52, 0xFF, 0x1B, 0x7A, 0x11, 0xCA, 0x1A, 0x9B, 0x40, 0xAD, 0x01 }; /* The "secret" key */ u8 pi_secret[5] = { 0x55, 0xD6, 0xC4, 0xC5, 0x28 }; u8 pi_bits[30]; u8 pi_scratch[10]; u8 pi_tmp1[5]; u8 pi_tmp2[5]; u8 i_lfsr0_o; /* 1 bit used */ u8 i_lfsr1_o; /* 1 bit used */ u32 i_lfsr0; u32 i_lfsr1; u8 i_css_varient; u8 i_cse; u8 i_index; u8 i_combined; u8 i_carry; u8 i_val = 0; int i_term = 0; int i_bit; int i; for (i = 9; i >= 0; --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]; /* * This encryption engine implements one of 32 variations * one the same theme depending upon the choice in the * varient parameter (0 - 31). * * The algorithm itself manipulates a 40 bit input into * a 40 bit output. * The parameter 'input' is 80 bits. It consists of * the 40 bit input value that is to be encrypted followed * by a 40 bit seed value for the pseudo random number * generators. */ /* Feed the secret into the input values such that * we alter the seed to the LFSR's used above, then * generate the bits to play with. */ for( i = 5 ; --i >= 0 ; ) { pi_tmp1[i] = pi_scratch[5 + i] ^ pi_secret[i] ^ pi_crypt_tab2[i]; } /* * We use two LFSR's (seeded from some of the input data bytes) to * generate two streams of pseudo-random bits. These two bit streams * are then combined by simply adding with carry to generate a final * sequence of pseudo-random bits which is stored in the buffer that * 'output' points to the end of - len is the size of this buffer. * * The first LFSR is of degree 25, and has a polynomial of: * x^13 + x^5 + x^4 + x^1 + 1 * * The second LSFR is of degree 17, and has a (primitive) polynomial of: * x^15 + x^1 + 1 * * I don't know if these polynomials are primitive modulo 2, and thus * represent maximal-period LFSR's. * * * Note that we take the output of each LFSR from the new shifted in * bit, not the old shifted out bit. Thus for ease of use the LFSR's * are implemented in bit reversed order. * */ /* In order to ensure that the LFSR works we need to ensure that the * 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 ); i_lfsr1 = ( pi_tmp1[3] << 9 ) | 0x100 | pi_tmp1[4]; i_index = sizeof(pi_bits); i_carry = 0; do { for( i_bit = 0, i_val = 0 ; i_bit < 8 ; ++i_bit ) { i_lfsr0_o = ( ( i_lfsr0 >> 24 ) ^ ( i_lfsr0 >> 21 ) ^ ( i_lfsr0 >> 20 ) ^ ( i_lfsr0 >> 12 ) ) & 1; i_lfsr0 = ( i_lfsr0 << 1 ) | i_lfsr0_o; i_lfsr1_o = ( ( i_lfsr1 >> 16 ) ^ ( i_lfsr1 >> 2 ) ) & 1; i_lfsr1 = ( i_lfsr1 << 1 ) | i_lfsr1_o; #define BIT0(x) ((x) & 1) #define BIT1(x) (((x) >> 1) & 1) i_combined = !i_lfsr1_o + i_carry + !i_lfsr0_o; /* taking bit 1 */ i_carry = ( i_combined >> 1 ) & 1; i_val |= ( i_combined & 1 ) << i_bit; } pi_bits[--i_index] = i_val; } while( i_index > 0 ); /* This term is used throughout the following to * select one of 32 different variations on the * algorithm. */ i_cse = pi_varients[i_css_varient] ^ pi_crypt_tab2[i_css_varient]; /* Now the actual blocks doing the encryption. Each * of these works on 40 bits at a time and are quite * similar. */ i_index = 0; for( i = 5, i_term = 0 ; --i >= 0 ; i_term = pi_scratch[i] ) { i_index = pi_bits[25 + i] ^ pi_scratch[i]; i_index = pi_crypt_tab1[i_index] ^ ~pi_crypt_tab2[i_index] ^ i_cse; pi_tmp1[i] = pi_crypt_tab2[i_index] ^ pi_crypt_tab3[i_index] ^ i_term; } pi_tmp1[4] ^= pi_tmp1[0]; for( i = 5, i_term = 0 ; --i >= 0 ; i_term = pi_tmp1[i] ) { i_index = pi_bits[20 + i] ^ pi_tmp1[i]; i_index = pi_crypt_tab1[i_index] ^ ~pi_crypt_tab2[i_index] ^ i_cse; pi_tmp2[i] = pi_crypt_tab2[i_index] ^ pi_crypt_tab3[i_index] ^ i_term; } pi_tmp2[4] ^= pi_tmp2[0]; for( i = 5, i_term = 0 ; --i >= 0 ; i_term = pi_tmp2[i] ) { i_index = pi_bits[15 + i] ^ pi_tmp2[i]; i_index = pi_crypt_tab1[i_index] ^ ~pi_crypt_tab2[i_index] ^ i_cse; i_index = pi_crypt_tab2[i_index] ^ pi_crypt_tab3[i_index] ^ i_term; pi_tmp1[i] = pi_crypt_tab0[i_index] ^ pi_crypt_tab2[i_index]; } pi_tmp1[4] ^= pi_tmp1[0]; for( i = 5, i_term = 0 ; --i >= 0 ; i_term = pi_tmp1[i] ) { i_index = pi_bits[10 + i] ^ pi_tmp1[i]; i_index = pi_crypt_tab1[i_index] ^ ~pi_crypt_tab2[i_index] ^ i_cse; i_index = pi_crypt_tab2[i_index] ^ pi_crypt_tab3[i_index] ^ i_term; pi_tmp2[i] = pi_crypt_tab0[i_index] ^ pi_crypt_tab2[i_index]; } pi_tmp2[4] ^= pi_tmp2[0]; for( i = 5, i_term = 0 ; --i >= 0 ; i_term = pi_tmp2[i] ) { i_index = pi_bits[5 + i] ^ pi_tmp2[i]; i_index = pi_crypt_tab1[i_index] ^ ~pi_crypt_tab2[i_index] ^ i_cse; pi_tmp1[i] = pi_crypt_tab2[i_index] ^ pi_crypt_tab3[i_index] ^ i_term; } pi_tmp1[4] ^= pi_tmp1[0]; for(i = 5, i_term = 0 ; --i >= 0 ; i_term = pi_tmp1[i] ) { i_index = pi_bits[i] ^ pi_tmp1[i]; i_index = pi_crypt_tab1[i_index] ^ ~pi_crypt_tab2[i_index] ^ i_cse; pi_key[i] = pi_crypt_tab2[i_index] ^ pi_crypt_tab3[i_index] ^ i_term; } return; } /***************************************************************************** * CSSCracker : title key decryption by cracking * --- * This function is called by CSSGetKeys to find a key *****************************************************************************/ 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 ) { 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; int i_exit = -1; for( i = 0 ; i < 10 ; i++ ) { pi_buffer[i] = pi_css_tab1[p_crypted[i]] ^ p_decrypted[i]; } for( i_try = i_start ; i_try < 0x10000 ; i_try++ ) { i_t1 = i_try >> 8 | 0x100; i_t2 = i_try & 0xff; i_t3 = 0; /* not needed */ i_t5 = 0; /* iterate cipher 4 times to reconstruct LFSR2 */ for( i = 0 ; i < 4 ; i++ ) { /* advance LFSR1 normaly */ 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 ) { i_t6 = ( i_t6 + 0xff ) & 0x0ff; } if( i_t6 < i_t4 ) { i_t6 += 0x100; } 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; } i_candidate = i_t3; /* iterate 6 more times to validate candidate key */ for( ; i < 10 ; i++ ) { 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; } if( i == 10 ) { /* Do 4 backwards steps of iterating t3 to deduce initial state */ i_t3 = i_candidate; for( i = 0 ; i < 4 ; i++ ) { i_t1 = i_t3 & 0xff; i_t3 = ( i_t3 >> 8 ); /* easy to code, and fast enough bruteforce * search for byte shifted in */ for( j = 0 ; j < 256 ; j++ ) { 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; } } } i_t4 = ( i_t3 >> 1 ) - 4; for( i_t5 = 0 ; i_t5 < 8; i_t5++ ) { if( ( ( i_t4 + i_t5 ) * 2 + 8 - ( (i_t4 + i_t5 ) & 7 ) ) == i_t3 ) { (*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; } } } } if( i_exit >= 0 ) { (*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]; } return i_exit; } /* * Authentication and keys */ /***************************************************************************** * 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; } /***************************************************************************** * CSSInit : CSS Structure initialisation and DVD authentication. * 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. *****************************************************************************/ css_t CSSInit( int i_fd ) { /* structures defined in cdrom.h or dvdio.h */ dvd_authinfo auth_info; dvd_struct dvd; css_t css; int i_error = -1; int i; css.i_fd = i_fd; css.b_error = 0; memset( &auth_info, 0, sizeof(auth_info) ); /* Test authentication success */ switch( CSSGetASF( i_fd ) ) { case -1: css.b_error = 1; case 1: return css; case 0: intf_WarnMsg( 3, "CSS: Authenticating" ); } /* Init sequence, request AGID */ for( i = 1; i < 4 ; ++i ) { 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 ) { /* No error during ioctl: we know if device * is authenticated */ break; } 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 ); } /* Unable to authenticate without AGID */ if( i_error == -1 ) { css.b_error = 1; intf_ErrMsg( "CSS: Cannot get AGID" ); return css; } for( i = 0 ; i < 10; ++i ) { css.disc.pi_challenge[i] = i; } /* Send AGID to host */ auth_info.type = DVD_HOST_SEND_CHALLENGE; /* Get challenge from host */ for( i = 0 ; i < 10 ; ++i ) { auth_info.hsc.chal[9-i] = css.disc.pi_challenge[i]; } /* Returning data, let LU change state */ css.i_agid = auth_info.lsa.agid; /* Send challenge to LU */ if( ioctl( i_fd, DVD_AUTH, &auth_info )<0 ) { intf_ErrMsg( "CSS: Send challenge to LU failed "); css.b_error = 1; return css; } /* Get key1 from LU */ if( ioctl( i_fd, DVD_AUTH, &auth_info ) < 0) { intf_ErrMsg( "CSS: Get key1 from LU failed "); css.b_error = 1; return css; } /* Send key1 to host */ for( i = 0 ; i < KEY_SIZE ; i++ ) { css.disc.pi_key1[i] = auth_info.lsk.key[4-i]; } for( i = 0 ; i < 32 ; ++i ) { CSSCryptKey( 0, i, css.disc.pi_challenge, css.disc.pi_key_check ); if( memcmp( css.disc.pi_key_check, 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; return css; } /* Get challenge from LU */ if( ioctl( i_fd, DVD_AUTH, &auth_info ) < 0 ) { intf_ErrMsg( "CSS: Get challenge from LU failed "); css.b_error = 1; return css; } /* Send challenge to host */ for( i = 0 ; i < 10 ; ++i ) { css.disc.pi_challenge[i] = auth_info.hsc.chal[9-i]; } CSSCryptKey( 1, css.disc.i_varient, css.disc.pi_challenge, css.disc.pi_key2 ); auth_info.type = DVD_HOST_SEND_KEY2; /* Get key2 from host */ for( i = 0 ; i < KEY_SIZE ; ++i ) { auth_info.hsk.key[4-i] = css.disc.pi_key2[i]; } /* Returning data, let LU change state */ /* Send key2 to LU */ if( ioctl( i_fd, DVD_AUTH, &auth_info ) < 0 ) { intf_ErrMsg( "CSS: Send key2 to LU failed (expected)" ); return css; } if( auth_info.type == DVD_AUTH_ESTABLISHED ) { intf_WarnMsg( 3, "CSS: Authentication established"); } else if( auth_info.type == DVD_AUTH_FAILURE ) { css.b_error = 1; intf_ErrMsg("CSS: DVD authentication failed"); } 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 ); intf_WarnMsg( 1, "CSS: Received Session Key" ); if( css.i_agid < 0 ) { css.b_error = 1; return css; } /* 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" ); } /* Get encrypted disc key */ dvd.type = DVD_STRUCT_DISCKEY; dvd.disckey.agid = css.i_agid; memset( dvd.disckey.value, 0, 2048 ); if( ioctl( i_fd, DVD_READ_STRUCT, &dvd ) < 0 ) { intf_ErrMsg( "CSS: Could not read Disc Key" ); css.b_error = 1; return css; } #if 1 /* Unencrypt disc key using bus key */ 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 ); #endif /* Test authentication success */ switch( CSSGetASF( i_fd ) ) { case -1: case 0: css.b_error = 1; case 1: return css; } return css; } /***************************************************************************** * CSSGetKeys : get the title keys. * The DVD should have been opened and authenticated before. *****************************************************************************/ int CSSGetKeys( css_t * p_css ) { /* * Title key cracking method from Ethan Hawke, * with Frank A. Stevenson algorithm. * Does not use any player key table and ioctls. */ 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; int i_title; int i_bytes_read; int i_best_plen; int i_best_p; int i_registered_keys; int i_total_keys_found; int i_highest; int i,j,k; for( i_title = 0 ; i_title < p_css->i_title_nb ; i_title++ ) { /* 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 */ i_pos = p_css->p_title_key[i_title].i; //fprintf( stderr, "CSS %d start pos: %lld\n", i_title, i_pos ); do { i_pos = lseek( p_css->i_fd, i_pos, SEEK_SET ); i_bytes_read = read( p_css->i_fd, pi_buf, 0x800 ); /* PES_scrambling_control */ if( pi_buf[0x14] & 0x30 ) { 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], &key ); while( i>=0 ) { k = 0; for( j=0 ; j= 1 ) { b_stop_scanning = 1; } } } i_pos += i_bytes_read; } while( i_bytes_read == 0x800 && !b_stop_scanning); if( b_stop_scanning) { intf_WarnMsg( 1, "CSS: Found enough occurancies of the same key." ); } if( !b_encrypted ) { intf_WarnMsg( 3, "CSS: This file was _NOT_ encrypted!"); return(0); } if( b_encrypted && i_registered_keys == 0 ) { intf_ErrMsg( "CSS: Unable to determine keys from file."); return(1); } for( i = 0 ; i < i_registered_keys - 1 ; i++ ) { for( j = i + 1 ; j < i_registered_keys ; j++ ) { if( p_title_key[j].i > p_title_key[i].i ) { memcpy( &key, &(p_title_key[j].key), sizeof(DVD_key_t) ); k = p_title_key[j].i; memcpy( &(p_title_key[j].key), &(p_title_key[i].key), sizeof(DVD_key_t) ); p_title_key[j].i = p_title_key[i].i; memcpy( &(p_title_key[i].key),&key, sizeof(DVD_key_t) ); p_title_key[i].i = k; } } } #ifdef STATS intf_WarnMsg( 1, " Key(s) & key probability\n---------------------"); #endif for( i=0 ; ip_title_key[i_title].key, p_title_key[i_highest].key, KEY_SIZE ); } return 0; } /***************************************************************************** * CSSDescrambleSector * --- * sec : sector to descramble * key : title key for this sector *****************************************************************************/ int CSSDescrambleSector( DVD_key_t key, u8* pi_sec ) { unsigned int i_t1, i_t2, i_t3, i_t4, i_t5, i_t6; u8* pi_end = pi_sec + 0x800; /* PES_scrambling_control */ if( pi_sec[0x14] & 0x30) { 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]) | (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 ) { 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; } } return(0); } #endif