1#pragma ident "%Z%%M% %I% %E% SMI"
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2/*
3 * These routines check and fix parity of encryption keys for the DES
4 * algorithm.
5 *
6 * They are a replacement for routines in key_parity.c, that don't require
7 * the table building that they do.
8 *
9 * Mark Eichin -- Cygnus Support
10 */
11
12
| 1/*
2 * These routines check and fix parity of encryption keys for the DES
3 * algorithm.
4 *
5 * They are a replacement for routines in key_parity.c, that don't require
6 * the table building that they do.
7 *
8 * Mark Eichin -- Cygnus Support
9 */
10
11
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13#include <des_int.h>
| 12#include "des_int.h"
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14
15/*
16 * des_fixup_key_parity: Forces odd parity per byte; parity is bits
17 * 8,16,...64 in des order, implies 0, 8, 16, ...
18 * vax order.
19 */
20#define smask(step) ((1<<step)-1)
21#define pstep(x,step) (((x)&smask(step))^(((x)>>step)&smask(step)))
22#define parity_char(x) pstep(pstep(pstep((x),4),2),1)
23
24void
| 13
14/*
15 * des_fixup_key_parity: Forces odd parity per byte; parity is bits
16 * 8,16,...64 in des order, implies 0, 8, 16, ...
17 * vax order.
18 */
19#define smask(step) ((1<<step)-1)
20#define pstep(x,step) (((x)&smask(step))^(((x)>>step)&smask(step)))
21#define parity_char(x) pstep(pstep(pstep((x),4),2),1)
22
23void
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25mit_des_fixup_key_parity(key)
26 register mit_des_cblock key;
| 24mit_des_fixup_key_parity(mit_des_cblock key)
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27{
28 int i;
29 for (i=0; i<sizeof(mit_des_cblock); i++)
30 {
31 key[i] &= 0xfe;
32 key[i] |= 1^parity_char(key[i]);
33 }
34
35 return;
36}
37
38/*
39 * des_check_key_parity: returns true iff key has the correct des parity.
40 * See des_fix_key_parity for the definition of
41 * correct des parity.
42 */
43int
| 25{
26 int i;
27 for (i=0; i<sizeof(mit_des_cblock); i++)
28 {
29 key[i] &= 0xfe;
30 key[i] |= 1^parity_char(key[i]);
31 }
32
33 return;
34}
35
36/*
37 * des_check_key_parity: returns true iff key has the correct des parity.
38 * See des_fix_key_parity for the definition of
39 * correct des parity.
40 */
41int
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44mit_des_check_key_parity(key)
45 register mit_des_cblock key;
| 42mit_des_check_key_parity(mit_des_cblock key)
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46{
47 int i;
48
49 for (i=0; i<sizeof(mit_des_cblock); i++)
50 {
51 if((key[i] & 1) == parity_char(0xfe&key[i]))
52 {
53 return 0;
54 }
55 }
56
57 return(1);
58}
59
| 43{
44 int i;
45
46 for (i=0; i<sizeof(mit_des_cblock); i++)
47 {
48 if((key[i] & 1) == parity_char(0xfe&key[i]))
49 {
50 return 0;
51 }
52 }
53
54 return(1);
55}
56
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