mirror of
https://github.com/dborth/snes9xgx.git
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65984b9102
- added: option to disable AA filtering
(snes graphics 'crisper', AA now default OFF)
- added: mapped zooming and turbo mode to classic controller
- added: preliminary usb support (loading)
- changed: sram and freezes now saved by filename, not internal romname.
If you have multiple versions of the same game, you can now have
srams and freezes for each version. A prompt to convert to the
new naming is provided for sram only.
- changed: by default, autoload/save sram and freeze enabled
180 lines
7.9 KiB
C
180 lines
7.9 KiB
C
#ifndef AUTH_DES_H
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#define AUTH_DES_H
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/* ========================================================================== **
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*
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* DES.h
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*
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* Copyright:
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* Copyright (C) 2003, 2004 by Christopher R. Hertel
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*
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* Email: crh@ubiqx.mn.org
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*
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* $Id: DES.h,v 0.5 2004/05/30 02:31:47 crh Exp $
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*
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* -------------------------------------------------------------------------- **
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*
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* Description:
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*
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* Implements DES encryption, but not decryption.
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* DES is used to create LM password hashes and both LM and NTLM Responses.
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*
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* -------------------------------------------------------------------------- **
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*
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* License:
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* -------------------------------------------------------------------------- **
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*
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* Notes:
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*
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* This implementation was created by studying many existing examples
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* found in Open Source, in the public domain, and in various documentation.
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* The SMB protocol makes minimal use of the DES function, so this is a
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* minimal implementation. That which is not required has been removed.
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*
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* The SMB protocol uses the DES algorithm as a hash function, not an
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* encryption function. The auth_DEShash() implemented here is a one-way
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* function. The reverse is not implemented in this module. Also, there
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* is no attempt at making this either fast or efficient. There is no
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* need, as the auth)DEShash() function is used for generating the LM
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* Response from a 7-byte key and an 8-byte challenge. It is not intended
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* for use in encrypting large blocks of data or data streams.
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*
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* As stated above, this implementation is based on studying existing work
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* in the public domain or under Open Source (specifically LGPL) license.
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* The code, however, is written from scratch. Obviously, I make no claim
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* with regard to those earlier works (except to claim that I am grateful
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* to the previous implementors whose work I studied). See the list of
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* references below for resources I used.
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*
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* References:
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* I read through the libmcrypt code to see how they put the pieces
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* together. See: http://mcrypt.hellug.gr/
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* Libmcrypt is available under the terms of the LGPL.
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*
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* The libmcrypt implementation includes the following credits:
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* written 12 Dec 1986 by Phil Karn, KA9Q; large sections adapted
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* from the 1977 public-domain program by Jim Gillogly
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* Modified for additional speed - 6 December 1988 Phil Karn
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* Modified for parameterized key schedules - Jan 1991 Phil Karn
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* modified in order to use the libmcrypt API by Nikos Mavroyanopoulos
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* All modifications are placed under the license of libmcrypt.
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*
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* See also Phil Karn's privacy and security page:
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* http://www.ka9q.net/privacy.html
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*
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* I relied heavily upon:
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* Applied Cryptography, Second Edition:
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* Protocols, Algorithms, and Source Code in C
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* by Bruce Schneier. ISBN 0-471-11709-9, John Wiley & Sons, Inc., 1996
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* Particularly Chapter 12.
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*
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* Here's one more DES resource, which I found quite helpful (aside from
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* the Clinton jokes):
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* http://www.aci.net/kalliste/des.htm
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*
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* Finally, the use of DES in SMB is covered in:
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* Implementing CIFS - the Common Internet File System
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* by your truly. ISBN 0-13-047116-X, Prentice Hall PTR., August 2003
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* Section 15.3, in particular.
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* (Online at: http://ubiqx.org/cifs/SMB.html#SMB.8.3)
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*
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* ========================================================================== **
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*/
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//#include "auth_common.h"
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#include <stdio.h>
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typedef unsigned char uchar;
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typedef unsigned char uint8_t;
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/* -------------------------------------------------------------------------- **
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* Functions:
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*/
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uchar *auth_DESkey8to7( uchar *dst, const uchar *key );
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/* ------------------------------------------------------------------------ **
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* Compress an 8-byte DES key to its 7-byte form.
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*
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* Input: dst - Pointer to a memory location (minimum 7 bytes) to accept
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* the compressed key.
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* key - Pointer to an 8-byte DES key. See the notes below.
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*
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* Output: A pointer to the compressed key (same as <dst>) or NULL if
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* either <src> or <dst> were NULL.
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*
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* Notes: There are no checks done to ensure that <dst> and <key> point
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* to sufficient space. Please be carefull.
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*
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* The two pointers, <dst> and <key> may point to the same
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* memory location. Internally, a temporary buffer is used and
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* the results are copied back to <dst>.
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*
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* The DES algorithm uses 8 byte keys by definition. The first
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* step in the algorithm, however, involves removing every eigth
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* bit to produce a 56-bit key (seven bytes). SMB authentication
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* skips this step and uses 7-byte keys. The <auth_DEShash()>
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* algorithm in this module expects 7-byte keys. This function
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* is used to convert an 8-byte DES key into a 7-byte SMB DES key.
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*
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* ------------------------------------------------------------------------ **
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*/
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uchar *auth_DEShash( uchar *dst, const uchar *key, const uchar *src );
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/* ------------------------------------------------------------------------ **
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* DES encryption of the input data using the input key.
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*
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* Input: dst - Destination buffer. It *must* be at least eight bytes
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* in length, to receive the encrypted result.
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* key - Encryption key. Exactly seven bytes will be used.
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* If your key is shorter, ensure that you pad it to seven
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* bytes.
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* src - Source data to be encrypted. Exactly eight bytes will
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* be used. If your source data is shorter, ensure that
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* you pad it to eight bytes.
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*
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* Output: A pointer to the encrpyted data (same as <dst>).
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*
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* Notes: In SMB, the DES function is used as a hashing function rather
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* than an encryption/decryption tool. When used for generating
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* the LM hash the <src> input is the known value "KGS!@#$%" and
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* the key is derived from the password entered by the user.
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* When used to generate the LM or NTLM response, the <key> is
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* derived from the LM or NTLM hash, and the challenge is used
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* as the <src> input.
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* See: http://ubiqx.org/cifs/SMB.html#SMB.8.3
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*
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* - This function is called "DEShash" rather than just "DES"
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* because it is only used for creating LM hashes and the
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* LM/NTLM responses. For all practical purposes, however, it
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* is a full DES encryption implementation.
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*
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* - This DES implementation does not need to be fast, nor is a
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* DES decryption function needed. The goal is to keep the
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* code small, simple, and well documented.
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*
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* - The input values are copied and refiddled within the module
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* and the result is not written to <dst> until the very last
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* step, so it's okay if <dst> points to the same memory as
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* <key> or <src>.
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*
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* ------------------------------------------------------------------------ **
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*/
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/* ========================================================================== */
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#endif /* AUTH_DES_H */
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