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
|
/*
* $Source$
* $Author$
*
* Copyright 1990 by the Massachusetts Institute of Technology.
*
* For copying and distribution information, please see the file
* <krb5/mit-copyright.h>.
*
* krb5_kdb_encrypt_key(), krb5_kdb_decrypt_key functions
*/
#if !defined(lint) && !defined(SABER)
static char rcsid_decrypt_key_c [] =
"$Id$";
#endif /* !lint & !SABER */
#include <krb5/copyright.h>
#include <krb5/krb5.h>
#include <krb5/kdb5_err.h>
#include <krb5/ext-proto.h>
#include <errno.h>
/*
* Decrypt a key from storage in the database. "eblock" is used
* to decrypt the key in "in" into "out"; the storage pointed to by "out"
* is allocated before use.
*/
krb5_error_code
krb5_kdb_decrypt_key(eblock, in, out)
krb5_encrypt_block *eblock;
const krb5_keyblock *in;
krb5_keyblock *out;
{
krb5_error_code retval;
/* the encrypted version is stored as the unencrypted key length
(in host byte order), followed by the encrypted key.
*/
out->keytype = in->keytype;
out->length = krb5_encrypt_size(in->length-sizeof(in->length),
eblock->crypto_entry);
out->contents = (krb5_octet *)malloc(out->length);
if (!out->contents) {
out->contents = 0;
out->length = 0;
return ENOMEM;
}
/* copy out the real length count */
bcopy((char *)in->contents, (char *)&out->length,
sizeof(out->length));
/* remember the contents of the encrypted version has a sizeof(in->length)
integer length of the real embedded key, followed by the
encrypted key, so the offset here is needed */
if (retval = (*eblock->crypto_entry->
decrypt_func)((krb5_pointer) (((char *) in->contents) +
sizeof(in->length)),
(krb5_pointer) out->contents,
in->length-sizeof(in->length), eblock, 0)) {
free((char *)out->contents);
out->contents = 0;
out->length = 0;
return retval;
}
if (out->length < 0) {
free((char *)out->contents);
out->contents = 0;
out->length = 0;
return KRB5_KDB_INVALIDKEYSIZE;
}
return retval;
}
|
