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/*
* lib/crypto/des/weak_key.c
*
* Copyright 1989,1990 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*
* Under U.S. law, this software may not be exported outside the US
* without license from the U.S. Commerce department.
*
* These routines form the library interface to the DES facilities.
*
* Originally written 8/85 by Steve Miller, MIT Project Athena.
*/
#include "k5-int.h"
#include "des_int.h"
/*
* The following are the weak DES keys:
*/
static mit_des_cblock weak[16] = {
/* weak keys */
{0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01},
{0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe},
{0x1f,0x1f,0x1f,0x1f,0x0e,0x0e,0x0e,0x0e},
{0xe0,0xe0,0xe0,0xe0,0xf1,0xf1,0xf1,0xf1},
/* semi-weak */
{0x01,0xfe,0x01,0xfe,0x01,0xfe,0x01,0xfe},
{0xfe,0x01,0xfe,0x01,0xfe,0x01,0xfe,0x01},
{0x1f,0xe0,0x1f,0xe0,0x0e,0xf1,0x0e,0xf1},
{0xe0,0x1f,0xe0,0x1f,0xf1,0x0e,0xf1,0x0e},
{0x01,0xe0,0x01,0xe0,0x01,0xf1,0x01,0xf1},
{0xe0,0x01,0xe0,0x01,0xf1,0x01,0xf1,0x01},
{0x1f,0xfe,0x1f,0xfe,0x0e,0xfe,0x0e,0xfe},
{0xfe,0x1f,0xfe,0x1f,0xfe,0x0e,0xfe,0x0e},
{0x01,0x1f,0x01,0x1f,0x01,0x0e,0x01,0x0e},
{0x1f,0x01,0x1f,0x01,0x0e,0x01,0x0e,0x01},
{0xe0,0xfe,0xe0,0xfe,0xf1,0xfe,0xf1,0xfe},
{0xfe,0xe0,0xfe,0xe0,0xfe,0xf1,0xfe,0xf1}
};
/*
* mit_des_is_weak_key: returns true iff key is a [semi-]weak des key.
*
* Requires: key has correct odd parity.
*/
int
mit_des_is_weak_key(key)
mit_des_cblock key;
{
int i;
mit_des_cblock *weak_p = weak;
for (i = 0; i < (sizeof(weak)/sizeof(mit_des_cblock)); i++) {
if (!memcmp((char *)weak_p++,(char *)key,sizeof(mit_des_cblock)))
return 1;
}
return 0;
}
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