1 /*
2 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
3 * Use is subject to license terms.
4 */
5
6 /*
7 * lib/krb5/krb/copy_key.c
8 *
9 * Copyright 1990,1991 by the Massachusetts Institute of Technology.
10 * All Rights Reserved.
11 *
12 * Export of this software from the United States of America may
13 * require a specific license from the United States Government.
14 * It is the responsibility of any person or organization contemplating
15 * export to obtain such a license before exporting.
16 *
17 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
18 * distribute this software and its documentation for any purpose and
19 * without fee is hereby granted, provided that the above copyright
20 * notice appear in all copies and that both that copyright notice and
21 * this permission notice appear in supporting documentation, and that
22 * the name of M.I.T. not be used in advertising or publicity pertaining
23 * to distribution of the software without specific, written prior
24 * permission. Furthermore if you modify this software you must label
25 * your software as modified software and not distribute it in such a
26 * fashion that it might be confused with the original M.I.T. software.
27 * M.I.T. makes no representations about the suitability of
28 * this software for any purpose. It is provided "as is" without express
29 * or implied warranty.
30 *
31 *
32 * krb5_copy_keyblock()
33 */
34
35 #include "k5-int.h"
36
37 /*
38 * krb5_copy_keyblock_data
39 *
40 * Utility for copying keyblock data structures safely.
41 * This assumes that the necessary storage areas are
42 * already allocated.
43 */
44 krb5_error_code
krb5_copy_keyblock_data(krb5_context context,const krb5_keyblock * from,krb5_keyblock * to)45 krb5_copy_keyblock_data(krb5_context context,
46 const krb5_keyblock *from, krb5_keyblock *to)
47 {
48 krb5_error_code ret = 0;
49
50 /* If nothing to copy, return no error */
51 if (from == NULL || to == NULL)
52 return (0);
53
54 if ((to->contents == NULL || from->contents == NULL) &&
55 from->length > 0)
56 return (ENOMEM);
57
58 to->magic = from->magic;
59 to->enctype = from->enctype;
60 to->length = from->length;
61 to->dk_list = NULL;
62
63 if (from->length > 0)
64 (void) memcpy(to->contents, from->contents, from->length);
65
66 #ifdef _KERNEL
67 to->kef_mt = from->kef_mt;
68 to->kef_key.ck_data = NULL;
69 to->key_tmpl = NULL;
70 if ((ret = init_key_kef(context->kef_cipher_mt, to))) {
71 return (ret);
72 }
73 #else
74 /*
75 * Don't copy or try to initialize crypto framework
76 * data. This data gets initialized the first time it is
77 * used.
78 */
79 to->hKey = CK_INVALID_HANDLE;
80 #endif /* _KERNEL */
81 return (ret);
82 }
83
84
85 /*
86 * Copy a keyblock, including alloc'ed storage.
87 */
88 /*ARGSUSED*/
89 krb5_error_code KRB5_CALLCONV
krb5_copy_keyblock(context,from,to)90 krb5_copy_keyblock(context, from, to)
91 krb5_context context;
92 const krb5_keyblock *from;
93 krb5_keyblock **to;
94 {
95 krb5_keyblock *new_key;
96 krb5_error_code ret = 0;
97 if (!(new_key = (krb5_keyblock *) MALLOC(sizeof(krb5_keyblock))))
98 return (ENOMEM);
99
100 if (!(new_key->contents = (krb5_octet *)MALLOC(from->length))) {
101 FREE(new_key, sizeof(krb5_keyblock));
102 return (ENOMEM);
103 }
104
105 ret = krb5_copy_keyblock_data(context, from, new_key);
106 if (ret) {
107 krb5_free_keyblock(context, new_key);
108 return (ret);
109 }
110
111 *to = new_key;
112 return (ret);
113 }
114