* 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 $
+ * $Id: dvd_css.c,v 1.12 2001/02/20 07:49:12 sam Exp $
*
* Author: Stéphane Borel <stef@via.ecp.fr>
*
*****************************************************************************/
#include "defs.h"
-#if defined( HAVE_SYS_DVDIO_H ) || defined( LINUX_DVD )
+#if defined( HAVE_SYS_DVDIO_H ) || defined( LINUX_DVD ) || defined( SYS_BEOS )
#include <stdio.h>
#include <unistd.h>
#endif
#include "common.h"
+
#include "intf_msg.h"
+
#include "dvd_css.h"
+#include "dvd_ioctl.h"
#include "dvd_ifo.h"
+
#include "input_dvd.h"
/*****************************************************************************
for( auth_info.lsasf.agid = 0 ; auth_info.lsasf.agid < 4 ;
auth_info.lsasf.agid++ )
{
- if( !( ioctl( i_fd, DVD_AUTH, &auth_info ) ) )
+ if( !( dvd_ioctl( i_fd, DVD_AUTH, &auth_info ) ) )
{
intf_WarnMsg( 3, "CSS: %sAuthenticated",
( auth_info.lsasf.asf ) ? "" : "not " );
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 )
+ 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;
dvd.type = DVD_STRUCT_COPYRIGHT;
dvd.copyright.layer_num = 0;
- if( ioctl( i_fd, DVD_READ_STRUCT, &dvd ) < 0 )
+ if( dvd_ioctl( i_fd, DVD_READ_STRUCT, &dvd ) < 0 )
{
intf_ErrMsg( "DVD ioctl error" );
return -1;
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 );
+ i_error = dvd_ioctl( i_fd, DVD_AUTH, &auth_info );
if( i_error != -1 )
{
/* No error during ioctl: we know if device
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 );
+ dvd_ioctl( i_fd, DVD_AUTH, &auth_info );
}
/* Unable to authenticate without AGID */
css.i_agid = auth_info.lsa.agid;
/* Send challenge to LU */
- if( ioctl( i_fd, DVD_AUTH, &auth_info )<0 )
+ if( dvd_ioctl( i_fd, DVD_AUTH, &auth_info )<0 )
{
intf_ErrMsg( "CSS: Send challenge to LU failed ");
css.b_error = 1;
}
/* Get key1 from LU */
- if( ioctl( i_fd, DVD_AUTH, &auth_info ) < 0)
+ if( dvd_ioctl( i_fd, DVD_AUTH, &auth_info ) < 0)
{
intf_ErrMsg( "CSS: Get key1 from LU failed ");
css.b_error = 1;
}
/* Get challenge from LU */
- if( ioctl( i_fd, DVD_AUTH, &auth_info ) < 0 )
+ if( dvd_ioctl( i_fd, DVD_AUTH, &auth_info ) < 0 )
{
intf_ErrMsg( "CSS: Get challenge from LU failed ");
css.b_error = 1;
/* Returning data, let LU change state */
/* Send key2 to LU */
- if( ioctl( i_fd, DVD_AUTH, &auth_info ) < 0 )
+ if( dvd_ioctl( i_fd, DVD_AUTH, &auth_info ) < 0 )
{
intf_ErrMsg( "CSS: Send key2 to LU failed (expected)" );
return css;
dvd.disckey.agid = css.i_agid;
memset( dvd.disckey.value, 0, 2048 );
- if( ioctl( i_fd, DVD_READ_STRUCT, &dvd ) < 0 )
+ if( dvd_ioctl( i_fd, DVD_READ_STRUCT, &dvd ) < 0 )
{
intf_ErrMsg( "CSS: Could not read Disc Key" );
css.b_error = 1;
}
/*****************************************************************************
- * CSSGetKeys : get the title keys.
+ * CSSGetKey : get title key.
* The DVD should have been opened and authenticated before.
*****************************************************************************/
-int CSSGetKeys( css_t * p_css )
+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 key;
- title_key_t p_title_key[10] ;
+ 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_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;
+ 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 );
- do {
- i_pos = lseek( p_css->i_fd, i_pos, SEEK_SET );
- i_bytes_read = read( p_css->i_fd, pi_buf, 0x800 );
+ 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;
+ /* 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( i = 2 ; i < 0x30 ; i++ )
+ {
+ for( j = i ; ( j < 0x80 ) &&
+ ( pi_buf[0x7F - (j%i)] == pi_buf[0x7F-j] ) ; j++ );
{
- for( j = i ; ( j < 0x80 ) &&
- ( pi_buf[0x7F - (j%i)] == pi_buf[0x7F-j] ) ; j++ );
+ if( ( j > i_best_plen ) && ( j > i ) )
{
- if( ( j > i_best_plen ) && ( j > i ) )
- {
- i_best_plen = j;
- i_best_p = i;
- }
+ i_best_plen = j;
+ i_best_p = i;
}
}
+ }
- if( ( i_best_plen > 20 ) && ( i_best_plen / i_best_p >= 2) )
+ 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 )
{
- 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<i_registered_keys ; j++ )
{
- k = 0;
- for( j=0 ; j<i_registered_keys ; j++ )
- {
- if( memcmp( &(p_title_key[j].key),
- &key, sizeof(DVD_key_t) ) == 0 )
- {
- p_title_key[j].i++;
- i_total_keys_found++;
- k = 1;
- }
- }
-
- if( k == 0 )
+ if( memcmp( &(p_title_key[j].pi_key),
+ &pi_key, sizeof(dvd_key_t) ) == 0 )
{
- memcpy( &(p_title_key[i_registered_keys].key),
- &key, sizeof(DVD_key_t) );
- p_title_key[i_registered_keys++].i = 1;
+ p_title_key[j].i_occ++;
i_total_keys_found++;
+ k = 1;
}
- i = CSSCracker( i, &pi_buf[0x80],
- &pi_buf[0x80 -( i_best_plen / i_best_p) *i_best_p],
- (DVD_key_t*)&pi_buf[0x54], &key);
}
- /* 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 >= 1 )
+ if( k == 0 )
{
- b_stop_scanning = 1;
+ 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);
+ }
+
+ /* 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_pos += i_bytes_read;
- } while( i_bytes_read == 0x800 && !b_stop_scanning);
+ 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_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 )
+ {
+ 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);
- }
+ 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( i = 0 ; i < i_registered_keys - 1 ; i++ )
+ {
+ for( j = i + 1 ; j < i_registered_keys ; j++ )
{
- for( j = i + 1 ; j < i_registered_keys ; j++ )
+ if( p_title_key[j].i_occ > p_title_key[i].i_occ )
{
- 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( &pi_key, &(p_title_key[j].pi_key), sizeof(dvd_key_t) );
+ k = p_title_key[j].i_occ;
- 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[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;
- memcpy( &(p_title_key[i].key),&key, sizeof(DVD_key_t) );
- p_title_key[i].i = k;
- }
+ memcpy( &(p_title_key[i].pi_key),&pi_key, sizeof(dvd_key_t) );
+ p_title_key[i].i_occ = k;
}
}
+ }
#ifdef STATS
- intf_WarnMsg( 1, " Key(s) & key probability\n---------------------");
+ intf_WarnMsg( 1, " Key(s) & key probability\n---------------------");
#endif
- for( i=0 ; i<i_registered_keys ; i++ )
- {
+ for( i=0 ; i<i_registered_keys ; i++ )
+ {
#ifdef STATS
- intf_WarnMsg( 1, "%d) %02X %02X %02X %02X %02X - %3.2f%%", i,
- p_title_key[i].key[0], p_title_key[i].key[1],
- p_title_key[i].key[2], p_title_key[i].key[3],
- p_title_key[i].key[4],
- p_title_key[i].i * 100.0 / i_total_keys_found );
+ intf_WarnMsg( 1, "%d) %02X %02X %02X %02X %02X - %3.2f%%", i,
+ p_title_key[i].key[0], p_title_key[i].key[1],
+ p_title_key[i].key[2], p_title_key[i].key[3],
+ p_title_key[i].key[4],
+ p_title_key[i].i_occ * 100.0 / i_total_keys_found );
#endif
- if( p_title_key[i_highest].i * 100.0 / i_total_keys_found
- <= p_title_key[i].i*100.0 / i_total_keys_found )
- {
- i_highest = i;
- }
+ 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;
}
+ }
- /* 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 + 1,
- p_title_key[i_highest].key[0],
- p_title_key[i_highest].key[1],
- p_title_key[i_highest].key[2],
- p_title_key[i_highest].key[3],
- p_title_key[i_highest].key[4] );
-
- memcpy( p_css->p_title_key[i_title].key,
- p_title_key[i_highest].key, KEY_SIZE );
- }
+ /* 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 + 1,
+ 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] );
+
+ memcpy( p_css->pi_title_key,
+ p_title_key[i_highest].pi_key, KEY_SIZE );
return 0;
}
* sec : sector to descramble
* key : title key for this sector
*****************************************************************************/
-int CSSDescrambleSector( DVD_key_t key, u8* pi_sec )
+int CSSDescrambleSector( dvd_key_t pi_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]) |
+ 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;
projects / vlc / blobdiff