1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
/*
* lib/crypto/des/cbc_cksum.c
*
* Copyright 1985, 1986, 1987, 1988, 1990 by the Massachusetts Institute
* of Technology.
* All Rights Reserved.
*
* Under U.S. law, this software may not be exported outside the US
* without license from the U.S. Commerce department.
*
* These routines form the library interface to the DES facilities.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*
*/
#include "k5-int.h"
#include "des_int.h"
/*
produces cbc cheksum of sequence "in" of the length "in_length"
with the help of key "key" of size "key_size" (which should be 8);
fills out krb5_checksum structure.
caller is responsible for allocating & freeing "contents" element in
krb5_checksum structure.
returns: errors
*/
static krb5_error_code mit_des_cbc_checksum
PROTOTYPE((krb5_const krb5_pointer,
krb5_const size_t,
krb5_const krb5_pointer,
krb5_const size_t,
krb5_checksum FAR * ));
static krb5_error_code mit_des_cbc_verf_cksum
PROTOTYPE ((krb5_const krb5_checksum FAR *,
krb5_const krb5_pointer,
krb5_const size_t,
krb5_const krb5_pointer,
krb5_const size_t ));
static krb5_error_code
mit_des_cbc_checksum(in, in_length, key, key_size, cksum)
krb5_const krb5_pointer in;
krb5_const size_t in_length;
krb5_const krb5_pointer key;
krb5_const size_t key_size;
krb5_checksum FAR * cksum;
{
struct mit_des_ks_struct *schedule; /* pointer to key schedules */
if (cksum->length < sizeof(mit_des_cblock))
return KRB5_BAD_MSIZE;
if (key_size != sizeof(mit_des_cblock))
return KRB5_BAD_KEYSIZE;
if (!(schedule = (struct mit_des_ks_struct *) malloc(sizeof(mit_des_key_schedule))))
return ENOMEM;
#define cleanup() { memset((char *)schedule, 0, sizeof(mit_des_key_schedule));\
free( (char *) schedule); }
switch (mit_des_key_sched ((krb5_octet *)key, schedule)) {
case -1:
cleanup();
return KRB5DES_BAD_KEYPAR;
case -2:
cleanup();
return KRB5DES_WEAK_KEY;
default:
;
}
cksum->checksum_type = CKSUMTYPE_DESCBC;
cksum->length = sizeof(mit_des_cblock);
mit_des_cbc_cksum(in, cksum->contents, in_length, schedule, key);
cleanup();
return 0;
}
static krb5_error_code
mit_des_cbc_verf_cksum(cksum, in, in_length, key, key_size)
krb5_const krb5_checksum FAR * cksum;
krb5_const krb5_pointer in;
krb5_const size_t in_length;
krb5_const krb5_pointer key;
krb5_const size_t key_size;
{
struct mit_des_ks_struct *schedule; /* pointer to key schedules */
mit_des_cblock contents;
krb5_error_code retval;
if (key_size != sizeof(mit_des_cblock))
return KRB5_BAD_KEYSIZE;
if (!(schedule = (struct mit_des_ks_struct *) malloc(sizeof(mit_des_key_schedule))))
return ENOMEM;
#define cleanup() { memset((char *)schedule, 0, sizeof(mit_des_key_schedule));\
free( (char *) schedule); }
switch (mit_des_key_sched ((krb5_octet *)key, schedule)) {
case -1:
cleanup();
return KRB5DES_BAD_KEYPAR;
case -2:
cleanup();
return KRB5DES_WEAK_KEY;
default:
;
}
mit_des_cbc_cksum(in, contents, in_length, schedule, key);
retval = 0;
if (cksum->checksum_type == CKSUMTYPE_DESCBC) {
if (cksum->length == sizeof(mit_des_cblock)) {
if (memcmp((char *) cksum->contents,
(char *) contents,
sizeof(mit_des_cblock)))
retval = KRB5KRB_AP_ERR_BAD_INTEGRITY;
}
else
retval = KRB5KRB_AP_ERR_BAD_INTEGRITY;
}
else
retval = KRB5KRB_AP_ERR_INAPP_CKSUM;
cleanup();
return retval;
}
krb5_checksum_entry krb5_des_cbc_cksumtable_entry = {
0,
mit_des_cbc_checksum,
mit_des_cbc_verf_cksum,
sizeof(mit_des_cblock),
1, /* is collision proof */
1, /* is keyed */
};
|
