Return to key_parity.c CVS log

Up to [CSRG BSD Unix] / 43BSDReno / kerberosIV / des

Annotation of 43BSDReno/kerberosIV/des/key_parity.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * $Source: /mit/kerberos/src/lib/des/RCS/key_parity.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:  * These routines check and fix parity of encryption keys for the DES
        !            11:  * algorithm.
        !            12:  *
        !            13:  * Under U.S. law, this software may not be exported outside the US
        !            14:  * without license from the U.S. Commerce department.
        !            15:  *
        !            16:  * These routines form the library interface to the DES facilities.
        !            17:  *
        !            18:  */
        !            19: 
        !            20: #ifndef        lint
        !            21: static char rcsid_key_parity_c[] =
        !            22: "$Header: key_parity.c,v 4.0 89/01/22 11:45:12 jtkohl Exp $";
        !            23: #endif lint
        !            24: 
        !            25: #include <mit-copyright.h>
        !            26: #include <des.h>
        !            27: #include "des_internal.h"
        !            28: 
        !            29: #include "odd.h"          /* Load compile-time generated odd_parity table */
        !            30: 
        !            31: /*
        !            32:  * des_fixup_key_parity: Forces odd parity per byte; parity is bits
        !            33:  *                       8,16,...64 in des order, implies 0, 8, 16, ...
        !            34:  *                       vax order.
        !            35:  */
        !            36: void
        !            37: des_fixup_key_parity(key)
        !            38:      register des_cblock key;
        !            39: {
        !            40:     int i;
        !            41: 
        !            42:     for (i=0; i<sizeof(des_cblock); i++)
        !            43:       key[i] = odd_parity[key[i]];
        !            44: 
        !            45:     return;
        !            46: }
        !            47: 
        !            48: /*
        !            49:  * des_check_key_parity: returns true iff key has the correct des parity.
        !            50:  *                       See des_fix_key_parity for the definition of
        !            51:  *                       correct des parity.
        !            52:  */
        !            53: int
        !            54: des_check_key_parity(key)
        !            55:      register des_cblock key;
        !            56: {
        !            57:     int i;
        !            58: 
        !            59:     for (i=0; i<sizeof(des_cblock); i++)
        !            60:       if (key[i] != odd_parity[key[i]])
        !            61:        return(0);
        !            62: 
        !            63:     return(1);
        !            64: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.