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
|
/*
* lib/crypto/prf.c
*
* Copyright (C) 2004 by the Massachusetts Institute of Technology.
* All rights reserved.
*
* 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. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* 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.
*
*
*
* This contains the implementation of krb5_c_prf, which will find
*the enctype-specific PRF and then generate pseudo-random data. This
*function yields krb5_c_prf_length bytes of output.
*/
#include "k5-int.h"
#include "etypes.h"
#include <assert.h>
krb5_error_code KRB5_CALLCONV
krb5_c_prf_length(krb5_context context, krb5_enctype enctype,
size_t *len)
{
int i;
assert (len);
for (i=0; i<krb5_enctypes_length; i++) {
if (krb5_enctypes_list[i].etype == enctype)
break;
}
if (i == krb5_enctypes_length)
return(KRB5_BAD_ENCTYPE);
*len = krb5_enctypes_list[i].prf_length;
return 0;
}
krb5_error_code KRB5_CALLCONV
krb5_c_prf(krb5_context context, const krb5_keyblock *key,
krb5_data *input, krb5_data *output)
{
int i;
size_t len;
assert(input && output);
assert (output->data);
for (i=0; i<krb5_enctypes_length; i++) {
if (krb5_enctypes_list[i].etype == key->enctype)
break;
}
if (i == krb5_enctypes_length)
return(KRB5_BAD_ENCTYPE);
output->magic = KV5M_DATA;
if (!krb5_enctypes_list[i].prf)
return (KRB5_CRYPTO_INTERNAL);
krb5_c_prf_length (context, key->enctype, &len);
if (len != output->length)
return (KRB5_CRYPTO_INTERNAL);
return((*(krb5_enctypes_list[i].prf))
(krb5_enctypes_list[i].enc, krb5_enctypes_list[i].hash,
key, input, output));
}
|