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/*
* daap-sharp
* Copyright (C) 2005 James Willcox <snorp@snorp.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* Copyright (C) 2004 David Hammerton <david@crazney.net>
* Copyright (C) 2005 Jon Lech Johansen <jon@nanocrew.net>
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
using System;
using System.Text;
namespace Daap {
internal class Hasher
{
private static byte [] _hasht42 = null;
private static byte [] _hasht45 = null;
private static byte [] _hexchars =
Encoding.ASCII.GetBytes( "0123456789ABCDEF" );
private static byte [] _copyright = Convert.FromBase64String(
"Q29weXJpZ2h0IDIwMDMgQXBwbGUgQ29tcHV0ZXIsIEluYy4=" );
private static void HashToString( byte [] hash, byte [] str, int offset )
{
for( int i = 0; i < hash.Length; i++ )
{
byte tmp = hash[ i ];
str[ i * 2 + 1 + offset ] = _hexchars[ tmp & 0xF ];
str[ i * 2 + 0 + offset ] = _hexchars[ (tmp >> 4) & 0xF ];
}
}
private static void TransformString( BrokenMD5 md5, string str, bool final )
{
byte [] tmp = Encoding.ASCII.GetBytes( str );
if( final )
md5.TransformFinalBlock( tmp, 0, tmp.Length );
else
md5.TransformBlock( tmp, 0, tmp.Length, tmp, 0 );
}
private static void GenerateTable42()
{
int i;
_hasht42 = new byte[ 256 * 32 ];
for( i = 0; i < 256; i++ )
{
BrokenMD5 md5 = new BrokenMD5( 0 );
if( ( i & 0x80 ) != 0 )
TransformString( md5, "Accept-Language", false );
else
TransformString( md5, "user-agent", false );
if( ( i & 0x40 ) != 0 )
TransformString( md5, "max-age", false );
else
TransformString( md5, "Authorization", false );
if( ( i & 0x20 ) != 0 )
TransformString( md5, "Client-DAAP-Version", false );
else
TransformString( md5, "Accept-Encoding", false );
if( ( i & 0x10 ) != 0 )
TransformString( md5, "daap.protocolversion", false );
else
TransformString( md5, "daap.songartist", false );
if( ( i & 0x08 ) != 0 )
TransformString( md5, "daap.songcomposer", false );
else
TransformString( md5, "daap.songdatemodified", false );
if( ( i & 0x04 ) != 0 )
TransformString( md5, "daap.songdiscnumber", false );
else
TransformString( md5, "daap.songdisabled", false );
if( ( i & 0x02 ) != 0 )
TransformString( md5, "playlist-item-spec", false );
else
TransformString( md5, "revision-number", false );
if( ( i & 0x01 ) != 0 )
TransformString( md5, "session-id", true );
else
TransformString( md5, "content-codes", true );
HashToString( md5.Hash, _hasht42, i * 32 );
}
}
private static void GenerateTable45()
{
int i;
_hasht45 = new byte[ 256 * 32 ];
for( i = 0; i < 256; i++ )
{
BrokenMD5 md5 = new BrokenMD5( 1 );
if( ( i & 0x40 ) != 0 )
TransformString( md5, "eqwsdxcqwesdc", false );
else
TransformString( md5, "op[;lm,piojkmn", false );
if( ( i & 0x20 ) != 0 )
TransformString( md5, "876trfvb 34rtgbvc", false );
else
TransformString( md5, "=-0ol.,m3ewrdfv", false );
if( ( i & 0x10 ) != 0 )
TransformString( md5, "87654323e4rgbv ", false );
else
TransformString( md5, "1535753690868867974342659792", false );
if( ( i & 0x08 ) != 0 )
TransformString( md5, "Song Name", false );
else
TransformString( md5, "DAAP-CLIENT-ID:", false );
if( ( i & 0x04 ) != 0 )
TransformString( md5, "111222333444555", false );
else
TransformString( md5, "4089961010", false );
if( ( i & 0x02 ) != 0 )
TransformString( md5, "playlist-item-spec", false );
else
TransformString( md5, "revision-number", false );
if( ( i & 0x01 ) != 0 )
TransformString( md5, "session-id", false );
else
TransformString( md5, "content-codes", false );
if( ( i & 0x80 ) != 0 )
TransformString( md5, "IUYHGFDCXWEDFGHN", true );
else
TransformString( md5, "iuytgfdxwerfghjm", true );
HashToString( md5.Hash, _hasht45, i * 32 );
}
}
public static string GenerateHash(int version_major, string url,
int hash_select, int request_id )
{
if( _hasht42 == null )
GenerateTable42();
if( _hasht45 == null )
GenerateTable45();
byte [] hashtable = (version_major == 3) ? _hasht45 : _hasht42;
BrokenMD5 md5 = new BrokenMD5( (version_major == 3) ? 1 : 0 );
byte [] hash = new byte[ 32 ];
byte [] tmp = Encoding.ASCII.GetBytes( url );
md5.TransformBlock( tmp, 0, tmp.Length, tmp, 0 );
md5.TransformBlock( _copyright, 0, _copyright.Length, _copyright, 0 );
if( request_id > 0 && version_major == 3 )
{
md5.TransformBlock( hashtable, hash_select * 32, 32,
hashtable, hash_select * 32 );
tmp = Encoding.ASCII.GetBytes( request_id.ToString() );
md5.TransformFinalBlock( tmp, 0, tmp.Length );
}
else
{
md5.TransformFinalBlock( hashtable, hash_select * 32, 32 );
}
HashToString( md5.Hash, hash, 0 );
return Encoding.ASCII.GetString( hash );
}
}
}
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