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
|
/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* lib/crypto/nss/pbkdf2.c */
/*
* Copyright (c) 2010 Red Hat, Inc.
* All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* * Neither the name of Red Hat, Inc., nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <ctype.h>
#include "crypto_int.h"
#include "pk11pub.h"
#include "nss_gen.h"
krb5_error_code
krb5int_pbkdf2_hmac_sha1(const krb5_data *out, unsigned long count,
const krb5_data *pass, const krb5_data *salt)
{
PK11SlotInfo *slot = NULL;
SECAlgorithmID *algid = NULL;
PK11SymKey *symKey = NULL;
SECItem saltItem, pwItem;
const SECItem *keydata = NULL;
SECOidTag pbeAlg = SEC_OID_PKCS5_PBKDF2;
SECOidTag cipherAlg = SEC_OID_AES_256_CBC;
SECOidTag prfAlg = SEC_OID_HMAC_SHA1;
krb5_error_code ret;
ret = k5_nss_init();
if (ret)
return ret;
slot = PK11_GetBestSlot(PK11_AlgtagToMechanism(pbeAlg), NULL);
if (slot == NULL)
return k5_nss_map_last_error();
/* NSS treats a null saltItem.data as a request for a random salt. */
saltItem.type = siBuffer;
saltItem.data = (salt->data == NULL) ? "" : (unsigned char *)salt->data;
saltItem.len = salt->length;
/* PKCS 5 was designed to be DER encoded. Algid's carry all the
* information needed to describe the encoding the the recipient.
* This usually allows for crypto agility in the protocol automatically.
* Kerberos already had to solve it's crypto agility issues, so the
* algid is just and extra step we need that we will throw away */
algid = PK11_CreatePBEV2AlgorithmID(pbeAlg, cipherAlg, prfAlg,
out->length, count, &saltItem);
if (algid == NULL) {
ret = k5_nss_map_last_error();
goto loser;
}
pwItem.type = siBuffer;
pwItem.data = (unsigned char *)pass->data;
pwItem.len = pass->length;
symKey = PK11_PBEKeyGen(slot, algid, &pwItem, PR_FALSE, NULL);
if (symKey == NULL) {
ret = k5_nss_map_last_error();
goto loser;
}
/* At this point we should return symKey as a key, but kerberos is
* still passing bits around instead of key handles. */
PK11_ExtractKeyValue(symKey);
/* keydata here is a const * and is valid as long as the key has not been
* destroyed. */
keydata = PK11_GetKeyData(symKey);
if (keydata == NULL) {
ret = k5_nss_map_last_error();
goto loser;
}
if (out->length != keydata->len) {
ret = -1; /* XXXXX */
goto loser;
}
memcpy(out->data, keydata->data, keydata->len);
ret = 0;
loser:
if (symKey)
PK11_FreeSymKey(symKey);
if (algid)
SECOID_DestroyAlgorithmID(algid, PR_TRUE);
if (slot)
PK11_FreeSlot(slot);
return ret;
}
|
