* dvd_css.c: Functions for DVD authentification and unscrambling
*****************************************************************************
* Copyright (C) 1999-2001 VideoLAN
- * $Id: dvd_css.c,v 1.15 2001/02/22 08:44:45 stef Exp $
+ * $Id: dvd_css.c,v 1.30 2001/05/31 01:37:08 sam Exp $
*
* Author: Stéphane Borel <stef@via.ecp.fr>
*
* based on:
* - css-auth by Derek Fawcus <derek@spider.com>
* - DVD CSS ioctls example program by Andrew T. Veliath <andrewtv@usa.net>
- * - The Divide and conquer attack by Frank A. Stevenson<frank@funcom.com>
+ * - The Divide and conquer attack by Frank A. Stevenson <frank@funcom.com>
* - DeCSSPlus by Ethan Hawke
* - DecVOB
* see http://www.lemuria.org/DeCSS/ by Tom Vogt for more information.
#include "defs.h"
#include <stdio.h>
+#include <stdlib.h>
+
+#ifdef HAVE_UNISTD_H
#include <unistd.h>
-#include <string.h>
-#include <fcntl.h>
-#include <netinet/in.h>
-#ifdef HAVE_SYS_IOCTL_H
-# include <sys/ioctl.h>
-#endif
-#ifdef HAVE_SYS_DVDIO_H
-# include <sys/dvdio.h>
-#endif
-#ifdef LINUX_DVD
-# include <linux/cdrom.h>
+#elif defined( _MSC_VER ) && defined( _WIN32 )
+#include <io.h>
#endif
+#include <string.h>
+
#include "common.h"
#include "intf_msg.h"
#include "dvd_css.h"
+#ifdef HAVE_CSS
+#include "dvd_csstables.h"
+#endif /* HAVE_CSS */
#include "dvd_ioctl.h"
-#include "dvd_ifo.h"
#include "input_dvd.h"
/*****************************************************************************
- * CSS tables
+ * Local prototypes
*****************************************************************************/
-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
- */
+#ifdef HAVE_CSS
+static int CSSGetASF ( int i_fd );
+static void CSSCryptKey ( int i_key_type, int i_varient,
+ u8 const * pi_challenge, u8* pi_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 );
+#endif /* HAVE_CSS */
/*****************************************************************************
- * CSSGetASF : Get Authentification success flag
- * ---
- * Returns :
- * -1 on ioctl error,
- * 0 if the device needs to be authenticated,
- * 1 either.
+ * CSSTest : check if the disc is encrypted or not
*****************************************************************************/
-static int CSSGetASF( int i_fd )
+int CSSTest( int i_fd )
{
- dvd_authinfo auth_info;
+ int i_ret, i_copyright;
- auth_info.type = DVD_LU_SEND_ASF;
- auth_info.lsasf.asf = 0;
+ i_ret = ioctl_ReadCopyright( i_fd, 0 /* i_layer */, &i_copyright );
- for( auth_info.lsasf.agid = 0 ; auth_info.lsasf.agid < 4 ;
- auth_info.lsasf.agid++ )
+ if( i_ret < 0 )
{
- if( !( dvd_ioctl( i_fd, DVD_AUTH, &auth_info ) ) )
- {
- intf_WarnMsg( 3, "CSS: %sAuthenticated",
- ( auth_info.lsasf.asf ) ? "" : "not " );
- return auth_info.lsasf.asf;
- }
+ /* Since it's the first ioctl we try to issue, we add a notice */
+ intf_ErrMsg( "css error: ioctl_ReadCopyright failed, "
+ "make sure DVD ioctls were compiled in" );
+
+ return i_ret;
}
- /* The ioctl process has failed */
- intf_ErrMsg( "CSS: GetASF Fatal Error" );
- return -1;
+ return i_copyright;
}
/*****************************************************************************
- * 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.
+ * 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.
*****************************************************************************/
-static void CSSCryptKey( int i_key_type, int i_varient,
- u8 const * pi_challenge, u8* pi_key )
+int CSSInit( int i_fd, css_t * p_css )
{
- /* 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 } };
+#ifdef HAVE_CSS
+ /* structures defined in cdrom.h or dvdio.h */
+ char p_buffer[2048 + 4 + 1];
+ int i_agid = 0;
+ int i_ret = -1;
+ int i;
- /* 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 } };
+ /* Test authentication success */
+ switch( CSSGetASF( i_fd ) )
+ {
+ case -1:
+ return -1;
- 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 };
+ case 1:
+ intf_WarnMsg( 2, "css info: already authenticated" );
+ return 0;
- /* The "secret" key */
- u8 pi_secret[5] = { 0x55, 0xD6, 0xC4, 0xC5, 0x28 };
+ case 0:
+ intf_WarnMsg( 2, "css info: need to authenticate" );
+ }
- 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;
+ /* Init sequence, request AGID */
+ for( i = 1; i < 4 ; ++i )
+ {
+ intf_WarnMsg( 2, "css info: requesting AGID %d", i );
- for (i = 9; i >= 0; --i)
- pi_scratch[i] = pi_challenge[ppi_perm_challenge[i_key_type][i]];
+ i_ret = ioctl_ReportAgid( i_fd, &i_agid );
- i_css_varient = ( i_key_type == 0 ) ? i_varient :
- ppi_perm_varient[i_key_type-1][i_varient];
+ if( i_ret != -1 )
+ {
+ /* No error during ioctl: we know the device is authenticated */
+ break;
+ }
- /*
- * 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.
- */
+ intf_ErrMsg( "css error: ioctl_ReportAgid failed, invalidating" );
- /* 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 ; )
+ i_agid = 0;
+ ioctl_InvalidateAgid( i_fd, &i_agid );
+ }
+
+ /* Unable to authenticate without AGID */
+ if( i_ret == -1 )
{
- pi_tmp1[i] = pi_scratch[5 + i] ^ pi_secret[i] ^ pi_crypt_tab2[i];
+ intf_ErrMsg( "css error: ioctl_ReportAgid failed, fatal" );
+ return -1;
}
- /*
- * 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];
+ for( i = 0 ; i < 10; ++i )
+ {
+ p_css->disc.pi_challenge[i] = i;
+ }
- i_index = sizeof(pi_bits);
- i_carry = 0;
+ /* Get challenge from host */
+ for( i = 0 ; i < 10 ; ++i )
+ {
+ p_buffer[9-i] = p_css->disc.pi_challenge[i];
+ }
- do
+ /* Send challenge to LU */
+ if( ioctl_SendChallenge( i_fd, &i_agid, p_buffer ) < 0 )
{
- for( i_bit = 0, i_val = 0 ; i_bit < 8 ; ++i_bit )
- {
+ intf_ErrMsg( "css error: ioctl_SendChallenge failed" );
+ return -1;
+ }
- i_lfsr0_o = ( ( i_lfsr0 >> 24 ) ^ ( i_lfsr0 >> 21 ) ^
- ( i_lfsr0 >> 20 ) ^ ( i_lfsr0 >> 12 ) ) & 1;
- i_lfsr0 = ( i_lfsr0 << 1 ) | i_lfsr0_o;
+ /* Get key1 from LU */
+ if( ioctl_ReportKey1( i_fd, &i_agid, p_buffer ) < 0)
+ {
+ intf_ErrMsg( "css error: ioctl_ReportKey1 failed" );
+ return -1;
+ }
- i_lfsr1_o = ( ( i_lfsr1 >> 16 ) ^ ( i_lfsr1 >> 2 ) ) & 1;
- i_lfsr1 = ( i_lfsr1 << 1 ) | i_lfsr1_o;
+ /* Send key1 to host */
+ for( i = 0 ; i < KEY_SIZE ; i++ )
+ {
+ p_css->disc.pi_key1[i] = p_buffer[4-i];
+ }
-#define BIT0(x) ((x) & 1)
-#define BIT1(x) (((x) >> 1) & 1)
+ for( i = 0 ; i < 32 ; ++i )
+ {
+ CSSCryptKey( 0, i, p_css->disc.pi_challenge,
+ p_css->disc.pi_key_check );
- 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;
+ if( memcmp( p_css->disc.pi_key_check,
+ p_css->disc.pi_key1, KEY_SIZE ) == 0 )
+ {
+ intf_WarnMsg( 2, "css info: drive authentic, using variant %d", i);
+ p_css->disc.i_varient = i;
+ break;
}
-
- 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] )
+ if( i == 32 )
{
- i_index = pi_bits[25 + i] ^ pi_scratch[i];
- i_index = pi_crypt_tab1[i_index] ^ ~pi_crypt_tab2[i_index] ^ i_cse;
+ intf_ErrMsg( "css error: drive would not authenticate" );
+ return -1;
+ }
- pi_tmp1[i] = pi_crypt_tab2[i_index] ^ pi_crypt_tab3[i_index] ^ i_term;
+ /* Get challenge from LU */
+ if( ioctl_ReportChallenge( i_fd, &i_agid, p_buffer ) < 0 )
+ {
+ intf_ErrMsg( "css error: ioctl_ReportKeyChallenge failed" );
+ return -1;
}
- pi_tmp1[4] ^= pi_tmp1[0];
- for( i = 5, i_term = 0 ; --i >= 0 ; i_term = pi_tmp1[i] )
+ /* Send challenge to host */
+ for( i = 0 ; i < 10 ; ++i )
{
- i_index = pi_bits[20 + i] ^ pi_tmp1[i];
- i_index = pi_crypt_tab1[i_index] ^ ~pi_crypt_tab2[i_index] ^ i_cse;
+ p_css->disc.pi_challenge[i] = p_buffer[9-i];
+ }
- pi_tmp2[i] = pi_crypt_tab2[i_index] ^ pi_crypt_tab3[i_index] ^ i_term;
+ CSSCryptKey( 1, p_css->disc.i_varient, p_css->disc.pi_challenge,
+ p_css->disc.pi_key2 );
+
+ /* Get key2 from host */
+ for( i = 0 ; i < KEY_SIZE ; ++i )
+ {
+ p_buffer[4-i] = p_css->disc.pi_key2[i];
}
- pi_tmp2[4] ^= pi_tmp2[0];
- for( i = 5, i_term = 0 ; --i >= 0 ; i_term = pi_tmp2[i] )
+ /* Send key2 to LU */
+ if( ioctl_SendKey2( i_fd, &i_agid, p_buffer ) < 0 )
{
- 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;
+ intf_ErrMsg( "css error: ioctl_SendKey2 failed" );
+ return -1;
+ }
- pi_tmp1[i] = pi_crypt_tab0[i_index] ^ pi_crypt_tab2[i_index];
+ intf_WarnMsg( 2, "css info: authentication established" );
+
+ memcpy( p_css->disc.pi_challenge, p_css->disc.pi_key1, KEY_SIZE );
+ memcpy( p_css->disc.pi_challenge+KEY_SIZE, p_css->disc.pi_key2, KEY_SIZE );
+
+ CSSCryptKey( 2, p_css->disc.i_varient, p_css->disc.pi_challenge,
+ p_css->disc.pi_key_check );
+
+ intf_WarnMsg( 2, "css info: received session key" );
+
+ if( i_agid < 0 )
+ {
+ return -1;
}
- pi_tmp1[4] ^= pi_tmp1[0];
- for( i = 5, i_term = 0 ; --i >= 0 ; i_term = pi_tmp1[i] )
+ /* Test authentication success */
+ switch( CSSGetASF( i_fd ) )
{
- i_index = pi_bits[10 + i] ^ pi_tmp1[i];
- i_index = pi_crypt_tab1[i_index] ^ ~pi_crypt_tab2[i_index] ^ i_cse;
+ case -1:
+ return -1;
- i_index = pi_crypt_tab2[i_index] ^ pi_crypt_tab3[i_index] ^ i_term;
+ case 1:
+ intf_WarnMsg( 2, "css info: already authenticated" );
+ return 0;
- pi_tmp2[i] = pi_crypt_tab0[i_index] ^ pi_crypt_tab2[i_index];
+ case 0:
+ intf_WarnMsg( 2, "css info: need to get disc key" );
}
- pi_tmp2[4] ^= pi_tmp2[0];
- for( i = 5, i_term = 0 ; --i >= 0 ; i_term = pi_tmp2[i] )
+ /* Get encrypted disc key */
+ if( ioctl_ReadKey( i_fd, &i_agid, p_buffer ) < 0 )
{
- i_index = pi_bits[5 + i] ^ pi_tmp2[i];
- i_index = pi_crypt_tab1[i_index] ^ ~pi_crypt_tab2[i_index] ^ i_cse;
+ intf_ErrMsg( "css error: ioctl_ReadKey failed" );
+ return -1;
+ }
- pi_tmp1[i] = pi_crypt_tab2[i_index] ^ pi_crypt_tab3[i_index] ^ i_term;
+ /* Unencrypt disc key using bus key */
+ for( i = 0 ; i < 2048 ; i++ )
+ {
+ p_buffer[ i ] ^= p_css->disc.pi_key_check[ 4 - (i % KEY_SIZE) ];
}
- pi_tmp1[4] ^= pi_tmp1[0];
+ memcpy( p_css->disc.pi_key_check, p_buffer, 2048 );
- for(i = 5, i_term = 0 ; --i >= 0 ; i_term = pi_tmp1[i] )
+ /* initialize title key to know it empty */
+ for( i = 0 ; i < KEY_SIZE ; i++ )
{
- i_index = pi_bits[i] ^ pi_tmp1[i];
- i_index = pi_crypt_tab1[i_index] ^ ~pi_crypt_tab2[i_index] ^ i_cse;
+ p_css->pi_title_key[i] = 0;
+ }
- pi_key[i] = pi_crypt_tab2[i_index] ^ pi_crypt_tab3[i_index] ^ i_term;
+ /* Test authentication success */
+ switch( CSSGetASF( i_fd ) )
+ {
+ case -1:
+ return -1;
+
+ case 1:
+ intf_WarnMsg( 2, "css info: successfully authenticated" );
+ return 0;
+
+ case 0:
+ intf_ErrMsg( "css error: no way to authenticate" );
+ return -1;
}
- return;
-}
+#else /* HAVE_CSS */
+ intf_ErrMsg( "css error: CSS decryption is disabled in this module" );
+
+#endif /* HAVE_CSS */
+ return -1;
+
+}
/*****************************************************************************
- * CSSCracker : title key decryption by cracking
- * ---
- * This function is called by CSSGetKeys to find a key
+ * CSSGetKey : get title key.
+ *****************************************************************************
+ * The DVD should have been opened and authenticated before.
*****************************************************************************/
-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 )
+int CSSGetKey( int i_fd, css_t * p_css )
{
- 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;
-
+#ifdef HAVE_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 pi_key;
+ off_t i_pos;
+ boolean_t b_encrypted;
+ boolean_t b_stop_scanning;
+ int i_bytes_read;
+ int i_best_plen;
+ int i_best_p;
+ int i,j;
- for( i = 0 ; i < 10 ; i++ )
+ for( i = 0 ; i < KEY_SIZE ; i++ )
{
- pi_buffer[i] = pi_css_tab1[p_crypted[i]] ^ p_decrypted[i];
+ pi_key[i] = 0;
}
- 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;
- }
+ b_encrypted = 0;
+ b_stop_scanning = 0;
- i_candidate = i_t3;
+ /* Position of the title on the disc */
+ i_pos = p_css->i_title_pos;
- /* 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;
- }
+ do {
+ i_pos = lseek( i_fd, i_pos, SEEK_SET );
+ i_bytes_read = read( i_fd, pi_buf, 0x800 );
- i_t5 >>= 8;
- }
+ /* PES_scrambling_control */
+ if( pi_buf[0x14] & 0x30 )
+ {
+ b_encrypted = 1;
+ i_best_plen = 0;
+ i_best_p = 0;
- if( i == 10 )
+ for( i = 2 ; i < 0x30 ; i++ )
{
- /* Do 4 backwards steps of iterating t3 to deduce initial state */
- i_t3 = i_candidate;
- for( i = 0 ; i < 4 ; i++ )
+ for( j = i ; ( j < 0x80 ) &&
+ ( pi_buf[0x7F - (j%i)] == pi_buf[0x7F-j] ) ; j++ );
{
- 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++ )
+ if( ( j > i_best_plen ) && ( j > i ) )
{
- 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_best_plen = j;
+ i_best_p = i;
}
}
+ }
- 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_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],
+ &pi_key );
+ b_stop_scanning = ( i >= 0 );
}
}
- if( i_exit >= 0 )
+ i_pos += i_bytes_read;
+ } while( i_bytes_read == 0x800 && !b_stop_scanning);
+
+ if( b_stop_scanning)
{
- (*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];
+ memcpy( p_css->pi_title_key,
+ &pi_key, sizeof(dvd_key_t) );
+ intf_WarnMsg( 2, "css info: vts key initialized" );
+ return 0;
}
- 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( dvd_ioctl( i_fd, DVD_READ_STRUCT, &dvd ) < 0 )
+ if( !b_encrypted )
{
- intf_ErrMsg( "DVD ioctl error" );
- return -1;
+ intf_WarnMsg( 2, "css warning: this file was _NOT_ encrypted!" );
+ return 0;
}
- return dvd.copyright.cpst;
+ return -1;
+
+#else /* HAVE_CSS */
+ intf_ErrMsg( "css error: css decryption unavailable" );
+ return -1;
+
+#endif /* HAVE_CSS */
}
/*****************************************************************************
- * 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.
+ * CSSDescrambleSector
+ *****************************************************************************
+ * sec : sector to descramble
+ * key : title key for this sector
*****************************************************************************/
-
-css_t CSSInit( int i_fd )
+int CSSDescrambleSector( dvd_key_t pi_key, u8* pi_sec )
{
- /* 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) );
+#ifdef HAVE_CSS
+ unsigned int i_t1, i_t2, i_t3, i_t4, i_t5, i_t6;
+ u8* pi_end = pi_sec + 0x800;
- /* Test authentication success */
- switch( CSSGetASF( i_fd ) )
+ /* PES_scrambling_control */
+ if( pi_sec[0x14] & 0x30)
{
- case -1:
- css.b_error = 1;
- case 1:
- return css;
- case 0:
- intf_WarnMsg( 3, "CSS: Authenticating" );
- }
+ i_t1 = ((pi_key)[0] ^ pi_sec[0x54]) | 0x100;
+ i_t2 = (pi_key)[1] ^ pi_sec[0x55];
+ i_t3 = (((pi_key)[2]) | ((pi_key)[3] << 8) |
+ ((pi_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;
- /* 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 = dvd_ioctl( i_fd, DVD_AUTH, &auth_info );
- if( i_error != -1 )
+ while( pi_sec != pi_end )
{
- /* No error during ioctl: we know if device
- * is authenticated */
- break;
+ 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 );
+ pi_sec++;
+ i_t5 >>= 8;
}
-
- intf_ErrMsg( "CSS: AGID N/A, invalidating" );
- auth_info.type = DVD_INVALIDATE_AGID;
- auth_info.lsa.agid = 0;
- dvd_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;
- }
+ return 0;
- /* Send AGID to host */
- auth_info.type = DVD_HOST_SEND_CHALLENGE;
+#else /* HAVE_CSS */
+ return 1;
- /* 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;
+#endif /* HAVE_CSS */
+}
- /* Send challenge to LU */
- if( dvd_ioctl( i_fd, DVD_AUTH, &auth_info )<0 )
- {
- intf_ErrMsg( "CSS: Send challenge to LU failed ");
- css.b_error = 1;
- return css;
- }
+#ifdef HAVE_CSS
- /* Get key1 from LU */
- if( dvd_ioctl( i_fd, DVD_AUTH, &auth_info ) < 0)
- {
- intf_ErrMsg( "CSS: Get key1 from LU failed ");
- css.b_error = 1;
- return css;
- }
+/* Following functions are local */
- /* Send key1 to host */
- for( i = 0 ; i < KEY_SIZE ; i++ )
- {
- css.disc.pi_key1[i] = auth_info.lsk.key[4-i];
- }
+/*****************************************************************************
+ * 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 )
+{
+ int i_agid;
+ int i_asf = 0;
- for( i = 0 ; i < 32 ; ++i )
+ for( i_agid = 0 ; i_agid < 4 ; i_agid++ )
{
- 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 )
+ if( ioctl_ReportASF( i_fd, &i_agid, &i_asf ) == 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;
- }
+ intf_WarnMsg( 3, "css info: GetASF %sauthenticated",
+ i_asf ? "":"not " );
- /* Get challenge from LU */
- if( dvd_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];
+ return i_asf;
+ }
}
- CSSCryptKey( 1, css.disc.i_varient, css.disc.pi_challenge,
- css.disc.pi_key2 );
- auth_info.type = DVD_HOST_SEND_KEY2;
+ /* The ioctl process has failed */
+ intf_ErrMsg( "css error: GetASF fatal error" );
+ return -1;
+}
- /* 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 */
+/*****************************************************************************
+ * 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 } };
- /* Send key2 to LU */
- if( dvd_ioctl( i_fd, DVD_AUTH, &auth_info ) < 0 )
- {
- intf_ErrMsg( "CSS: Send key2 to LU failed (expected)" );
- return css;
- }
+ /* 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 } };
- 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");
- }
+ 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 };
- 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 );
+ /* The "secret" key */
+ u8 pi_secret[5] = { 0x55, 0xD6, 0xC4, 0xC5, 0x28 };
- intf_WarnMsg( 1, "CSS: Received Session Key" );
+ 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;
- if( css.i_agid < 0 )
- {
- css.b_error = 1;
- return css;
- }
+ for (i = 9; i >= 0; --i)
+ pi_scratch[i] = pi_challenge[ppi_perm_challenge[i_key_type][i]];
- /* 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" );
- }
+ i_css_varient = ( i_key_type == 0 ) ? i_varient :
+ ppi_perm_varient[i_key_type-1][i_varient];
- /* Get encrypted disc key */
- dvd.type = DVD_STRUCT_DISCKEY;
- dvd.disckey.agid = css.i_agid;
- memset( dvd.disckey.value, 0, 2048 );
+ /*
+ * 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.
+ */
- if( dvd_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 ) )
+ /* 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 ; )
{
- case -1:
- case 0:
- css.b_error = 1;
- case 1:
- return css;
+ pi_tmp1[i] = pi_scratch[5 + i] ^ pi_secret[i] ^ pi_crypt_tab2[i];
}
- return css;
-}
-
-/*****************************************************************************
- * CSSGetKey : get title key.
- * The DVD should have been opened and authenticated before.
- *****************************************************************************/
-int CSSGetKey( 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 pi_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;
-
- memset( p_title_key, 0, 10 );
- memset( &pi_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_title = p_css->i_title;
- i_pos = p_css->i_title_pos;
-
-//fprintf( stderr, "CSS %d start pos: %lld\n", i_title, i_pos );
+ * 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];
- do {
- i_pos = lseek( p_css->i_fd, i_pos, SEEK_SET );
- i_bytes_read = read( p_css->i_fd, pi_buf, 0x800 );
+ i_index = sizeof(pi_bits);
+ i_carry = 0;
- /* PES_scrambling_control */
- if( pi_buf[0x14] & 0x30 )
+ do
{
- b_encrypted = 1;
- i_best_plen = 0;
- i_best_p = 0;
-
- for( i = 2 ; i < 0x30 ; i++ )
+ for( i_bit = 0, i_val = 0 ; i_bit < 8 ; ++i_bit )
{
- 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],
- &pi_key );
- while( i>=0 )
- {
- k = 0;
- for( j=0 ; j<i_registered_keys ; j++ )
- {
- if( memcmp( &(p_title_key[j].pi_key),
- &pi_key, sizeof(dvd_key_t) ) == 0 )
- {
- p_title_key[j].i_occ++;
- i_total_keys_found++;
- k = 1;
- }
- }
+ i_lfsr0_o = ( ( i_lfsr0 >> 24 ) ^ ( i_lfsr0 >> 21 ) ^
+ ( i_lfsr0 >> 20 ) ^ ( i_lfsr0 >> 12 ) ) & 1;
+ i_lfsr0 = ( i_lfsr0 << 1 ) | i_lfsr0_o;
- if( k == 0 )
- {
- memcpy( &(p_title_key[i_registered_keys].pi_key),
- &pi_key, sizeof(dvd_key_t) );
- p_title_key[i_registered_keys++].i_occ = 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], &pi_key);
- }
+ i_lfsr1_o = ( ( i_lfsr1 >> 16 ) ^ ( i_lfsr1 >> 2 ) ) & 1;
+ i_lfsr1 = ( i_lfsr1 << 1 ) | i_lfsr1_o;
- /* Stop search if we find one occurance of the key
- * I have never found a DVD for which it is not enough
- * but we should take care of that */
- if( i_registered_keys == 1 && p_title_key[0].i_occ >= 1 )
- {
- b_stop_scanning = 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 );
- i_pos += i_bytes_read;
- } while( i_bytes_read == 0x800 && !b_stop_scanning);
+ /* 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];
- if( b_stop_scanning)
+ /* 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] )
{
- intf_WarnMsg( 1,
- "CSS: Found enough occurancies of the same key." );
+ 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];
- if( !b_encrypted )
+ for( i = 5, i_term = 0 ; --i >= 0 ; i_term = pi_tmp1[i] )
{
- intf_WarnMsg( 3, "CSS: This file was _NOT_ encrypted!");
- return(0);
+ 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];
- if( b_encrypted && i_registered_keys == 0 )
+ for( i = 5, i_term = 0 ; --i >= 0 ; i_term = pi_tmp2[i] )
{
- intf_ErrMsg( "CSS: Unable to determine keys from file.");
- return(1);
+ 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 = 0 ; i < i_registered_keys - 1 ; i++ )
+ for( i = 5, i_term = 0 ; --i >= 0 ; i_term = pi_tmp1[i] )
{
- for( j = i + 1 ; j < i_registered_keys ; j++ )
- {
- if( p_title_key[j].i_occ > p_title_key[i].i_occ )
- {
- memcpy( &pi_key, &(p_title_key[j].pi_key), sizeof(dvd_key_t) );
- k = p_title_key[j].i_occ;
+ i_index = pi_bits[10 + i] ^ pi_tmp1[i];
+ i_index = pi_crypt_tab1[i_index] ^ ~pi_crypt_tab2[i_index] ^ i_cse;
- memcpy( &(p_title_key[j].pi_key),
- &(p_title_key[i].pi_key), sizeof(dvd_key_t) );
- p_title_key[j].i_occ = p_title_key[i].i_occ;
+ i_index = pi_crypt_tab2[i_index] ^ pi_crypt_tab3[i_index] ^ i_term;
- memcpy( &(p_title_key[i].pi_key),&pi_key, sizeof(dvd_key_t) );
- p_title_key[i].i_occ = k;
- }
- }
+ pi_tmp2[i] = pi_crypt_tab0[i_index] ^ pi_crypt_tab2[i_index];
}
+ pi_tmp2[4] ^= pi_tmp2[0];
-#ifdef STATS
- intf_WarnMsg( 1, " Key(s) & key probability\n---------------------");
-#endif
- for( i=0 ; i<i_registered_keys ; i++ )
+ for( i = 5, i_term = 0 ; --i >= 0 ; i_term = pi_tmp2[i] )
{
-#ifdef STATS
- intf_WarnMsg( 1, "%d) %02X %02X %02X %02X %02X - %3.2f%%", i,
- p_title_key[i].pi_key[0], p_title_key[i].pi_key[1],
- p_title_key[i].pi_key[2], p_title_key[i].pi_key[3],
- p_title_key[i].pi_key[4],
- p_title_key[i].i_occ * 100.0 / i_total_keys_found );
-#endif
- if( p_title_key[i_highest].i_occ * 100.0 / i_total_keys_found
- <= p_title_key[i].i_occ*100.0 / i_total_keys_found )
- {
- i_highest = 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];
- /* 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)
- */
- intf_WarnMsg( 3, "CSS: Title %d key: %02X %02X %02X %02X %02X",
- i_title,
- p_title_key[i_highest].pi_key[0],
- p_title_key[i_highest].pi_key[1],
- p_title_key[i_highest].pi_key[2],
- p_title_key[i_highest].pi_key[3],
- p_title_key[i_highest].pi_key[4] );
+ 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;
- memcpy( p_css->pi_title_key,
- p_title_key[i_highest].pi_key, KEY_SIZE );
+ pi_key[i] = pi_crypt_tab2[i_index] ^ pi_crypt_tab3[i_index] ^ i_term;
+ }
- return 0;
+ return;
}
/*****************************************************************************
- * CSSDescrambleSector
- * ---
- * sec : sector to descramble
- * key : title key for this sector
+ * CSSCracker : title key decryption by cracking
+ *****************************************************************************
+ * This function is called by CSSGetKeys to find a key
*****************************************************************************/
-int CSSDescrambleSector( dvd_key_t pi_key, u8* pi_sec )
+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 int i_t1, i_t2, i_t3, i_t4, i_t5, i_t6;
- u8* pi_end = pi_sec + 0x800;
+ 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;
- /* PES_scrambling_control */
- if( pi_sec[0x14] & 0x30)
+
+ for( i = 0 ; i < 10 ; i++ )
{
- i_t1 = ((pi_key)[0] ^ pi_sec[0x54]) | 0x100;
- i_t2 = (pi_key)[1] ^ pi_sec[0x55];
- i_t3 = (((pi_key)[2]) | ((pi_key)[3] << 8) |
- ((pi_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;
+ 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;
- while( pi_sec != pi_end )
+ /* 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_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_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 );
+ 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(0);
+ return i_exit;
}
+#endif /* HAVE_CSS */
+
projects / vlc / blobdiff