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Annotation of 43BSDReno/kerberosIV/des/weak_key.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * $Source: /mit/kerberos/src/lib/des/RCS/weak_key.c,v $
                      3:  * $Author: jtkohl $
                      4:  *
                      5:  * Copyright 1989 by the Massachusetts Institute of Technology.
                      6:  *
                      7:  * For copying and distribution information, please see the file
                      8:  * <mit-copyright.h>.
                      9:  *
                     10:  * Under U.S. law, this software may not be exported outside the US
                     11:  * without license from the U.S. Commerce department.
                     12:  *
                     13:  * These routines form the library interface to the DES facilities.
                     14:  *
                     15:  * Originally written 8/85 by Steve Miller, MIT Project Athena.
                     16:  */
                     17: 
                     18: #ifndef        lint
                     19: static char rcsid_weak_key_c[] =
                     20: "$Header: weak_key.c,v 4.3 89/01/22 12:16:41 jtkohl Exp $";
                     21: #endif lint
                     22: 
                     23: #include <des.h>
                     24: #include "des_internal.h"
                     25: 
                     26: /*
                     27:  * The following are the weak DES keys:
                     28:  */
                     29: static des_cblock weak[16] = {
                     30:     /* weak keys */
                     31:     {0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01},
                     32:     {0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe},
                     33:     {0x1f,0x1f,0x1f,0x1f,0x0e,0x0e,0x0e,0x0e},
                     34:     {0xe0,0xe0,0xe0,0xe0,0xf1,0xf1,0xf1,0xf1},
                     35: 
                     36:     /* semi-weak */
                     37:     {0x01,0xfe,0x01,0xfe,0x01,0xfe,0x01,0xfe},
                     38:     {0xfe,0x01,0xfe,0x01,0xfe,0x01,0xfe,0x01},
                     39: 
                     40:     {0x1f,0xe0,0x1f,0xe0,0x0e,0xf1,0x0e,0xf1},
                     41:     {0xe0,0x1f,0xe0,0x1f,0xf1,0x0e,0xf1,0x0e},
                     42: 
                     43:     {0x01,0xe0,0x01,0xe0,0x01,0xf1,0x01,0xf1},
                     44:     {0xe0,0x01,0xe0,0x01,0xf1,0x01,0xf1,0x01},
                     45: 
                     46:     {0x1f,0xfe,0x1f,0xfe,0x0e,0xfe,0x0e,0xfe},
                     47:     {0xfe,0x1f,0xfe,0x1f,0xfe,0x0e,0xfe,0x0e},
                     48: 
                     49:     {0x01,0x1f,0x01,0x1f,0x01,0x0e,0x01,0x0e},
                     50:     {0x1f,0x01,0x1f,0x01,0x0e,0x01,0x0e,0x01},
                     51: 
                     52:     {0xe0,0xfe,0xe0,0xfe,0xf1,0xfe,0xf1,0xfe},
                     53:     {0xfe,0xe0,0xfe,0xe0,0xfe,0xf1,0xfe,0xf1}
                     54: };
                     55: 
                     56: /*
                     57:  * des_is_weak_key: returns true iff key is a [semi-]weak des key.
                     58:  *
                     59:  * Requires: key has correct odd parity.
                     60:  */
                     61: int
                     62: des_is_weak_key(key)
                     63:      des_cblock key;
                     64: {
                     65:     int i;
                     66:     des_cblock *weak_p = weak;
                     67: 
                     68:     for (i = 0; i < (sizeof(weak)/sizeof(des_cblock)); i++) {
                     69:        if (!bcmp((char *)weak_p++,(char *)key,sizeof(des_cblock)))
                     70:            return 1;
                     71:     }
                     72: 
                     73:     return 0;
                     74: }

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