1*7c478bd9Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 2*7c478bd9Sstevel@tonic-gate /* 3*7c478bd9Sstevel@tonic-gate * lib/crypto/des/weak_key.c 4*7c478bd9Sstevel@tonic-gate * 5*7c478bd9Sstevel@tonic-gate * Copyright 1989,1990 by the Massachusetts Institute of Technology. 6*7c478bd9Sstevel@tonic-gate * All Rights Reserved. 7*7c478bd9Sstevel@tonic-gate * 8*7c478bd9Sstevel@tonic-gate * Export of this software from the United States of America may 9*7c478bd9Sstevel@tonic-gate * require a specific license from the United States Government. 10*7c478bd9Sstevel@tonic-gate * It is the responsibility of any person or organization contemplating 11*7c478bd9Sstevel@tonic-gate * export to obtain such a license before exporting. 12*7c478bd9Sstevel@tonic-gate * 13*7c478bd9Sstevel@tonic-gate * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and 14*7c478bd9Sstevel@tonic-gate * distribute this software and its documentation for any purpose and 15*7c478bd9Sstevel@tonic-gate * without fee is hereby granted, provided that the above copyright 16*7c478bd9Sstevel@tonic-gate * notice appear in all copies and that both that copyright notice and 17*7c478bd9Sstevel@tonic-gate * this permission notice appear in supporting documentation, and that 18*7c478bd9Sstevel@tonic-gate * the name of M.I.T. not be used in advertising or publicity pertaining 19*7c478bd9Sstevel@tonic-gate * to distribution of the software without specific, written prior 20*7c478bd9Sstevel@tonic-gate * permission. M.I.T. makes no representations about the suitability of 21*7c478bd9Sstevel@tonic-gate * this software for any purpose. It is provided "as is" without express 22*7c478bd9Sstevel@tonic-gate * or implied warranty. 23*7c478bd9Sstevel@tonic-gate * 24*7c478bd9Sstevel@tonic-gate * 25*7c478bd9Sstevel@tonic-gate * Under U.S. law, this software may not be exported outside the US 26*7c478bd9Sstevel@tonic-gate * without license from the U.S. Commerce department. 27*7c478bd9Sstevel@tonic-gate * 28*7c478bd9Sstevel@tonic-gate * These routines form the library interface to the DES facilities. 29*7c478bd9Sstevel@tonic-gate * 30*7c478bd9Sstevel@tonic-gate * Originally written 8/85 by Steve Miller, MIT Project Athena. 31*7c478bd9Sstevel@tonic-gate */ 32*7c478bd9Sstevel@tonic-gate 33*7c478bd9Sstevel@tonic-gate #include <k5-int.h> 34*7c478bd9Sstevel@tonic-gate #include <des_int.h> 35*7c478bd9Sstevel@tonic-gate 36*7c478bd9Sstevel@tonic-gate /* 37*7c478bd9Sstevel@tonic-gate * The following are the weak DES keys: 38*7c478bd9Sstevel@tonic-gate */ 39*7c478bd9Sstevel@tonic-gate static const mit_des_cblock weak[16] = { 40*7c478bd9Sstevel@tonic-gate /* weak keys */ 41*7c478bd9Sstevel@tonic-gate {0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01}, 42*7c478bd9Sstevel@tonic-gate {0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe}, 43*7c478bd9Sstevel@tonic-gate {0x1f,0x1f,0x1f,0x1f,0x0e,0x0e,0x0e,0x0e}, 44*7c478bd9Sstevel@tonic-gate {0xe0,0xe0,0xe0,0xe0,0xf1,0xf1,0xf1,0xf1}, 45*7c478bd9Sstevel@tonic-gate 46*7c478bd9Sstevel@tonic-gate /* semi-weak */ 47*7c478bd9Sstevel@tonic-gate {0x01,0xfe,0x01,0xfe,0x01,0xfe,0x01,0xfe}, 48*7c478bd9Sstevel@tonic-gate {0xfe,0x01,0xfe,0x01,0xfe,0x01,0xfe,0x01}, 49*7c478bd9Sstevel@tonic-gate 50*7c478bd9Sstevel@tonic-gate {0x1f,0xe0,0x1f,0xe0,0x0e,0xf1,0x0e,0xf1}, 51*7c478bd9Sstevel@tonic-gate {0xe0,0x1f,0xe0,0x1f,0xf1,0x0e,0xf1,0x0e}, 52*7c478bd9Sstevel@tonic-gate 53*7c478bd9Sstevel@tonic-gate {0x01,0xe0,0x01,0xe0,0x01,0xf1,0x01,0xf1}, 54*7c478bd9Sstevel@tonic-gate {0xe0,0x01,0xe0,0x01,0xf1,0x01,0xf1,0x01}, 55*7c478bd9Sstevel@tonic-gate 56*7c478bd9Sstevel@tonic-gate {0x1f,0xfe,0x1f,0xfe,0x0e,0xfe,0x0e,0xfe}, 57*7c478bd9Sstevel@tonic-gate {0xfe,0x1f,0xfe,0x1f,0xfe,0x0e,0xfe,0x0e}, 58*7c478bd9Sstevel@tonic-gate 59*7c478bd9Sstevel@tonic-gate {0x01,0x1f,0x01,0x1f,0x01,0x0e,0x01,0x0e}, 60*7c478bd9Sstevel@tonic-gate {0x1f,0x01,0x1f,0x01,0x0e,0x01,0x0e,0x01}, 61*7c478bd9Sstevel@tonic-gate 62*7c478bd9Sstevel@tonic-gate {0xe0,0xfe,0xe0,0xfe,0xf1,0xfe,0xf1,0xfe}, 63*7c478bd9Sstevel@tonic-gate {0xfe,0xe0,0xfe,0xe0,0xfe,0xf1,0xfe,0xf1} 64*7c478bd9Sstevel@tonic-gate }; 65*7c478bd9Sstevel@tonic-gate 66*7c478bd9Sstevel@tonic-gate /* 67*7c478bd9Sstevel@tonic-gate * mit_des_is_weak_key: returns true iff key is a [semi-]weak des key. 68*7c478bd9Sstevel@tonic-gate * 69*7c478bd9Sstevel@tonic-gate * Requires: key has correct odd parity. 70*7c478bd9Sstevel@tonic-gate */ 71*7c478bd9Sstevel@tonic-gate int 72*7c478bd9Sstevel@tonic-gate mit_des_is_weak_key(key) 73*7c478bd9Sstevel@tonic-gate mit_des_cblock key; 74*7c478bd9Sstevel@tonic-gate { 75*7c478bd9Sstevel@tonic-gate int i; 76*7c478bd9Sstevel@tonic-gate const mit_des_cblock *weak_p = weak; 77*7c478bd9Sstevel@tonic-gate 78*7c478bd9Sstevel@tonic-gate for (i = 0; i < (sizeof(weak)/sizeof(mit_des_cblock)); i++) { 79*7c478bd9Sstevel@tonic-gate if (!memcmp((char *)weak_p++,(char *)key,sizeof(mit_des_cblock))) 80*7c478bd9Sstevel@tonic-gate return 1; 81*7c478bd9Sstevel@tonic-gate } 82*7c478bd9Sstevel@tonic-gate 83*7c478bd9Sstevel@tonic-gate return 0; 84*7c478bd9Sstevel@tonic-gate } 85