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fdf53e02 GW |
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 | } |