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Commit 3724ca76 authored by Jon Lech Johansen's avatar Jon Lech Johansen
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* drms: bugfixes in sci handling, GetiPodID darwin support.

parent b3e689d0
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modules/demux/mp4/drms.c
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......@@ -2,7 +2,7 @@
* drms.c: DRMS
*****************************************************************************
* Copyright (C) 2004 VideoLAN
* $Id: drms.c,v 1.11 2004/01/23 20:58:52 jlj Exp $
* $Id: drms.c,v 1.12 2004/01/26 17:15:40 jlj Exp $
*
* Authors: Jon Lech Johansen <jon-vl@nanocrew.net>
* Sam Hocevar <sam@zoy.org>
......@@ -54,8 +54,14 @@
# include <limits.h>
#endif
#ifdef SYS_DARWIN
# include <mach/mach.h>
# include <IOKit/IOKitLib.h>
# include <CoreFoundation/CFNumber.h>
#endif
#ifdef HAVE_SYSFS_LIBSYSFS_H
# include <sysfs/libsysfs.h>
# include <sysfs/libsysfs.h>
#endif
#include "drms.h"
......@@ -130,7 +136,7 @@ static void EndMD5 ( struct md5_s * );
static void Digest ( struct md5_s *, uint32_t * );
static void InitShuffle ( struct shuffle_s *, uint32_t * );
static void DoShuffle ( struct shuffle_s *, uint32_t * );
static void DoShuffle ( struct shuffle_s *, uint32_t *, uint32_t );
static int GetSystemKey ( uint32_t *, vlc_bool_t );
static int WriteUserKey ( void *, uint32_t * );
......@@ -677,12 +683,13 @@ static void InitShuffle( struct shuffle_s *p_shuffle, uint32_t *p_sys_key )
}
/*****************************************************************************
* DoShuffle: shuffle 16 byte buffer
* DoShuffle: shuffle buffer
*****************************************************************************
* This is so ugly and uses so many MD5 checksums that it is most certainly
* one-way, though why it needs to be so complicated is beyond me.
*****************************************************************************/
static void DoShuffle( struct shuffle_s *p_shuffle, uint32_t *p_buffer )
static void DoShuffle( struct shuffle_s *p_shuffle,
uint32_t *p_buffer, uint32_t i_size )
{
struct md5_s md5;
uint32_t p_big_bordel[ 16 ];
......@@ -733,7 +740,7 @@ static void DoShuffle( struct shuffle_s *p_shuffle, uint32_t *p_buffer )
EndMD5( &md5 );
/* XOR our buffer with the computed checksum */
for( i = 0; i < 4; i++ )
for( i = 0; i < i_size; i++ )
{
p_buffer[ i ] ^= md5.p_digest[ i ];
}
......@@ -875,8 +882,9 @@ static int GetUserKey( void *_p_drms, uint32_t *p_user_key )
struct shuffle_s shuffle;
uint32_t i, y;
uint32_t *p_sci_data;
uint32_t i_user, i_key;
uint32_t p_sys_key[ 4 ];
uint32_t i_sci_size, i_blocks;
uint32_t i_sci_size, i_blocks, i_remaining;
uint32_t *p_sci0, *p_sci1, *p_buffer;
uint32_t p_sci_key[ 4 ];
char *psz_ipod;
......@@ -905,6 +913,7 @@ static int GetUserKey( void *_p_drms, uint32_t *p_user_key )
/* Skip the first 4 bytes (some sort of header). Decrypt the rest. */
i_blocks = (i_sci_size - 4) / 16;
i_remaining = (i_sci_size - 4) - (i_blocks * 16);
p_buffer = p_sci_data + 1;
/* Decrypt and shuffle our data at the same time */
......@@ -927,7 +936,7 @@ static int GetUserKey( void *_p_drms, uint32_t *p_user_key )
memcpy( p_sci_key, p_buffer, 16 );
/* Shuffle the decrypted data using a custom routine */
DoShuffle( &shuffle, p_tmp );
DoShuffle( &shuffle, p_tmp, 4 );
/* Copy this block back to p_buffer */
memcpy( p_buffer, p_tmp, 16 );
......@@ -935,6 +944,13 @@ static int GetUserKey( void *_p_drms, uint32_t *p_user_key )
p_buffer += 4;
}
if( i_remaining >= 4 )
{
i_remaining /= 4;
REVERSE( p_buffer, i_remaining );
DoShuffle( &shuffle, p_buffer, i_remaining );
}
/* Phase 2: look for the user key in the generated data. I must admit I
* do not understand what is going on here, because it almost
* looks like we are browsing data that makes sense, even though
......@@ -970,15 +986,16 @@ static int GetUserKey( void *_p_drms, uint32_t *p_user_key )
continue;
}
REVERSE( p_sci0, 1 );
REVERSE( p_sci1, 1 );
if( U32_AT( p_sci0 ) == p_drms->i_user &&
( ( U32_AT( p_sci1 ) == p_drms->i_key ) ||
( !p_drms->i_key ) || ( p_sci1 == (p_sci0 + 18) ) ) )
i_user = U32_AT( p_sci0 );
i_key = U32_AT( p_sci1 );
REVERSE( &i_user, 1 );
REVERSE( &i_key, 1 );
if( i_user == p_drms->i_user && ( ( i_key == p_drms->i_key ) ||
( !p_drms->i_key && ( p_sci1 == (p_sci0 + 18) ) ) ) )
{
REVERSE( p_sci1 + 1, 4 );
memcpy( p_user_key, p_sci1 + 1, 16 );
WriteUserKey( p_drms, p_user_key );
REVERSE( p_sci1 + 1, 4 );
WriteUserKey( p_drms, p_sci1 + 1 );
i_ret = 0;
break;
}
......@@ -1184,6 +1201,9 @@ static int GetiPodID( long long *p_ipod_id )
{
int i_ret = -1;
#define PROD_NAME "iPod"
#define VENDOR_NAME "Apple Computer, Inc."
char *psz_ipod_id = getenv( "IPODID" );
if( psz_ipod_id != NULL )
{
......@@ -1191,7 +1211,60 @@ static int GetiPodID( long long *p_ipod_id )
return 0;
}
#ifdef HAVE_SYSFS_LIBSYSFS_H
#ifdef SYS_DARWIN
CFTypeRef value;
mach_port_t port;
io_object_t device;
io_iterator_t iterator;
CFMutableDictionaryRef matching_dic;
if( IOMasterPort( MACH_PORT_NULL, &port ) == KERN_SUCCESS )
{
if( ( matching_dic = IOServiceMatching( "IOFireWireUnit" ) ) != NULL )
{
CFDictionarySetValue( matching_dic,
CFSTR("FireWire Vendor Name"),
CFSTR(VENDOR_NAME) );
CFDictionarySetValue( matching_dic,
CFSTR("FireWire Product Name"),
CFSTR(PROD_NAME) );
if( IOServiceGetMatchingServices( port, matching_dic,
&iterator ) == KERN_SUCCESS )
{
while( ( device = IOIteratorNext( iterator ) ) != NULL )
{
value = IORegistryEntryCreateCFProperty( device,
CFSTR("GUID"), kCFAllocatorDefault, kNilOptions );
if( value != NULL )
{
if( CFGetTypeID( value ) == CFNumberGetTypeID() )
{
long long i_ipod_id;
CFNumberGetValue( (CFNumberRef)value,
kCFNumberLongLongType,
&i_ipod_id );
*p_ipod_id = i_ipod_id;
i_ret = 0;
}
CFRelease( value );
}
IOObjectRelease( device );
if( !i_ret ) break;
}
IOObjectRelease( iterator );
}
}
mach_port_deallocate( mach_task_self(), port );
}
#elif HAVE_SYSFS_LIBSYSFS_H
struct sysfs_bus *bus = NULL;
struct dlist *devlist = NULL;
struct dlist *attributes = NULL;
......@@ -1213,7 +1286,8 @@ static int GetiPodID( long long *p_ipod_id )
struct sysfs_attribute )
{
if( ( strcmp( curattr->name, "model_name" ) == 0 ) &&
( strncmp( curattr->value, "iPod", 4 ) == 0 ) )
( strncmp( curattr->value, PROD_NAME,
sizeof(PROD_NAME) ) == 0 ) )
{
*p_ipod_id = strtoll( curdev->name, NULL, 16 );
i_ret = 0;
......
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