17c478bd9Sstevel@tonic-gate /* 27c478bd9Sstevel@tonic-gate * lib/crypto/des/weak_key.c 37c478bd9Sstevel@tonic-gate * 47c478bd9Sstevel@tonic-gate * Copyright 1989,1990 by the Massachusetts Institute of Technology. 57c478bd9Sstevel@tonic-gate * All Rights Reserved. 67c478bd9Sstevel@tonic-gate * 77c478bd9Sstevel@tonic-gate * Export of this software from the United States of America may 87c478bd9Sstevel@tonic-gate * require a specific license from the United States Government. 97c478bd9Sstevel@tonic-gate * It is the responsibility of any person or organization contemplating 107c478bd9Sstevel@tonic-gate * export to obtain such a license before exporting. 117c478bd9Sstevel@tonic-gate * 127c478bd9Sstevel@tonic-gate * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and 137c478bd9Sstevel@tonic-gate * distribute this software and its documentation for any purpose and 147c478bd9Sstevel@tonic-gate * without fee is hereby granted, provided that the above copyright 157c478bd9Sstevel@tonic-gate * notice appear in all copies and that both that copyright notice and 167c478bd9Sstevel@tonic-gate * this permission notice appear in supporting documentation, and that 177c478bd9Sstevel@tonic-gate * the name of M.I.T. not be used in advertising or publicity pertaining 187c478bd9Sstevel@tonic-gate * to distribution of the software without specific, written prior 19*159d09a2SMark Phalan * permission. Furthermore if you modify this software you must label 20*159d09a2SMark Phalan * your software as modified software and not distribute it in such a 21*159d09a2SMark Phalan * fashion that it might be confused with the original M.I.T. software. 22*159d09a2SMark Phalan * M.I.T. makes no representations about the suitability of 237c478bd9Sstevel@tonic-gate * this software for any purpose. It is provided "as is" without express 247c478bd9Sstevel@tonic-gate * or implied warranty. 257c478bd9Sstevel@tonic-gate * 267c478bd9Sstevel@tonic-gate * 277c478bd9Sstevel@tonic-gate * Under U.S. law, this software may not be exported outside the US 287c478bd9Sstevel@tonic-gate * without license from the U.S. Commerce department. 297c478bd9Sstevel@tonic-gate * 307c478bd9Sstevel@tonic-gate * These routines form the library interface to the DES facilities. 317c478bd9Sstevel@tonic-gate * 327c478bd9Sstevel@tonic-gate * Originally written 8/85 by Steve Miller, MIT Project Athena. 337c478bd9Sstevel@tonic-gate */ 347c478bd9Sstevel@tonic-gate 35*159d09a2SMark Phalan #include "k5-int.h" 36*159d09a2SMark Phalan #include "des_int.h" 377c478bd9Sstevel@tonic-gate 387c478bd9Sstevel@tonic-gate /* 397c478bd9Sstevel@tonic-gate * The following are the weak DES keys: 407c478bd9Sstevel@tonic-gate */ 417c478bd9Sstevel@tonic-gate static const mit_des_cblock weak[16] = { 427c478bd9Sstevel@tonic-gate /* weak keys */ 437c478bd9Sstevel@tonic-gate {0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01}, 447c478bd9Sstevel@tonic-gate {0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe}, 457c478bd9Sstevel@tonic-gate {0x1f,0x1f,0x1f,0x1f,0x0e,0x0e,0x0e,0x0e}, 467c478bd9Sstevel@tonic-gate {0xe0,0xe0,0xe0,0xe0,0xf1,0xf1,0xf1,0xf1}, 477c478bd9Sstevel@tonic-gate 487c478bd9Sstevel@tonic-gate /* semi-weak */ 497c478bd9Sstevel@tonic-gate {0x01,0xfe,0x01,0xfe,0x01,0xfe,0x01,0xfe}, 507c478bd9Sstevel@tonic-gate {0xfe,0x01,0xfe,0x01,0xfe,0x01,0xfe,0x01}, 517c478bd9Sstevel@tonic-gate 527c478bd9Sstevel@tonic-gate {0x1f,0xe0,0x1f,0xe0,0x0e,0xf1,0x0e,0xf1}, 537c478bd9Sstevel@tonic-gate {0xe0,0x1f,0xe0,0x1f,0xf1,0x0e,0xf1,0x0e}, 547c478bd9Sstevel@tonic-gate 557c478bd9Sstevel@tonic-gate {0x01,0xe0,0x01,0xe0,0x01,0xf1,0x01,0xf1}, 567c478bd9Sstevel@tonic-gate {0xe0,0x01,0xe0,0x01,0xf1,0x01,0xf1,0x01}, 577c478bd9Sstevel@tonic-gate 587c478bd9Sstevel@tonic-gate {0x1f,0xfe,0x1f,0xfe,0x0e,0xfe,0x0e,0xfe}, 597c478bd9Sstevel@tonic-gate {0xfe,0x1f,0xfe,0x1f,0xfe,0x0e,0xfe,0x0e}, 607c478bd9Sstevel@tonic-gate 617c478bd9Sstevel@tonic-gate {0x01,0x1f,0x01,0x1f,0x01,0x0e,0x01,0x0e}, 627c478bd9Sstevel@tonic-gate {0x1f,0x01,0x1f,0x01,0x0e,0x01,0x0e,0x01}, 637c478bd9Sstevel@tonic-gate 647c478bd9Sstevel@tonic-gate {0xe0,0xfe,0xe0,0xfe,0xf1,0xfe,0xf1,0xfe}, 657c478bd9Sstevel@tonic-gate {0xfe,0xe0,0xfe,0xe0,0xfe,0xf1,0xfe,0xf1} 667c478bd9Sstevel@tonic-gate }; 677c478bd9Sstevel@tonic-gate 687c478bd9Sstevel@tonic-gate /* 697c478bd9Sstevel@tonic-gate * mit_des_is_weak_key: returns true iff key is a [semi-]weak des key. 707c478bd9Sstevel@tonic-gate * 717c478bd9Sstevel@tonic-gate * Requires: key has correct odd parity. 727c478bd9Sstevel@tonic-gate */ 737c478bd9Sstevel@tonic-gate int 74*159d09a2SMark Phalan mit_des_is_weak_key(mit_des_cblock key) 757c478bd9Sstevel@tonic-gate { 767c478bd9Sstevel@tonic-gate int i; 777c478bd9Sstevel@tonic-gate const mit_des_cblock *weak_p = weak; 787c478bd9Sstevel@tonic-gate 797c478bd9Sstevel@tonic-gate for (i = 0; i < (sizeof(weak)/sizeof(mit_des_cblock)); i++) { 80*159d09a2SMark Phalan if (!memcmp(weak_p++,key,sizeof(mit_des_cblock))) 817c478bd9Sstevel@tonic-gate return 1; 827c478bd9Sstevel@tonic-gate } 837c478bd9Sstevel@tonic-gate 847c478bd9Sstevel@tonic-gate return 0; 857c478bd9Sstevel@tonic-gate } 86