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
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Copyright (C) 1998 by the FundsXpress, INC.
*
* 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 FundsXpress. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. FundsXpress makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include "k5-int.h"
/* Solaris Kerberos */
#ifdef _KERNEL
/*
* In kernel, use the Kernel encryption framework HMAC
* operation, its far more efficient than the MIT method.
* Also, a template is used to further improve performance.
*/
/* ARGSUSED */
krb5_error_code
krb5_hmac(krb5_context context, const krb5_keyblock *key,
krb5_const krb5_data *input, krb5_data *output)
{
int rv = CRYPTO_FAILED;
crypto_mechanism_t mac_mech;
crypto_data_t dd;
crypto_data_t mac;
KRB5_LOG0(KRB5_INFO, "krb5_hmac() start");
if (output == NULL || output->data == NULL) {
KRB5_LOG0(KRB5_INFO, "krb5_hmac() NULL output");
return (rv);
}
if (input == NULL || input->data == NULL) {
KRB5_LOG0(KRB5_INFO, "krb5_hmac() NULL input");
return (rv);
}
dd.cd_format = CRYPTO_DATA_RAW;
dd.cd_offset = 0;
dd.cd_length = input->length;
dd.cd_raw.iov_base = (char *)input->data;
dd.cd_raw.iov_len = input->length;
mac.cd_format = CRYPTO_DATA_RAW;
mac.cd_offset = 0;
mac.cd_length = output->length;
mac.cd_raw.iov_base = (char *)output->data;
mac.cd_raw.iov_len = output->length;
mac_mech.cm_type = context->kef_hash_mt;
mac_mech.cm_param = NULL;
mac_mech.cm_param_len = 0;
rv = crypto_mac(&mac_mech, &dd,
(crypto_key_t *)&key->kef_key,
key->key_tmpl, &mac, NULL);
if (rv != CRYPTO_SUCCESS) {
KRB5_LOG(KRB5_ERR,"crypto_mac error: %0x", rv);
}
KRB5_LOG(KRB5_INFO, "krb5_hmac() end ret=%d\n", rv);
return(rv);
}
#else
/* Userland implementation of HMAC algorithm */
/*
* the HMAC transform looks like:
*
* H(K XOR opad, H(K XOR ipad, text))
*
* where H is a cryptographic hash
* K is an n byte key
* ipad is the byte 0x36 repeated blocksize times
* opad is the byte 0x5c repeated blocksize times
* and text is the data being protected
*/
krb5_error_code
krb5_hmac(krb5_context context,
krb5_const struct krb5_hash_provider *hash,
krb5_const krb5_keyblock *key,
krb5_const unsigned int icount,
krb5_const krb5_data *input,
krb5_data *output)
{
size_t hashsize, blocksize;
unsigned char *xorkey, *ihash;
int i;
krb5_data *hashin, hashout;
krb5_error_code ret;
/* Solaris Kerberos */
KRB5_LOG0(KRB5_INFO, "krb5_hmac() start\n");
if (hash == NULL) {
KRB5_LOG0(KRB5_ERR, "krb5_hmac() error hash == NULL\n");
return(EINVAL);
}
if (key == NULL) {
KRB5_LOG0(KRB5_ERR, "krb5_hmac() error key == NULL\n");
return(EINVAL);
}
if (input == NULL) {
KRB5_LOG0(KRB5_ERR, "krb5_hmac() error input == NULL\n");
return(EINVAL);
}
if (output == NULL) {
KRB5_LOG0(KRB5_ERR, "krb5_hmac() error output == NULL\n");
return(EINVAL);
}
hashsize = hash->hashsize;
blocksize = hash->blocksize;
if (key->length > blocksize)
return(KRB5_CRYPTO_INTERNAL);
if (output->length < hashsize)
return(KRB5_BAD_MSIZE);
/* if this isn't > 0, then there won't be enough space in this
array to compute the outer hash */
if (icount == 0)
return(KRB5_CRYPTO_INTERNAL);
/* allocate space for the xor key, hash input vector, and inner hash */
if ((xorkey = (unsigned char *) MALLOC(blocksize)) == NULL)
return(ENOMEM);
if ((ihash = (unsigned char *) MALLOC(hashsize)) == NULL) {
FREE(xorkey, blocksize);
return(ENOMEM);
}
if ((hashin = (krb5_data *)MALLOC(sizeof(krb5_data)*(icount+1))) == NULL) {
FREE(ihash, hashsize);
FREE(xorkey, blocksize);
return(ENOMEM);
}
/* create the inner padded key */
/* Solaris Kerberos */
(void) memset(xorkey, 0x36, blocksize);
for (i=0; i<key->length; i++)
xorkey[i] ^= key->contents[i];
/* compute the inner hash */
for (i=0; i<icount; i++) {
hashin[0].length = blocksize;
hashin[0].data = (char *) xorkey;
hashin[i+1] = input[i];
}
hashout.length = hashsize;
hashout.data = (char *) ihash;
/* Solaris Kerberos */
if ((ret = ((*(hash->hash))(context, icount+1, hashin, &hashout))))
goto cleanup;
/* create the outer padded key */
/* Solaris Kerberos */
(void) memset(xorkey, 0x5c, blocksize);
for (i=0; i<key->length; i++)
xorkey[i] ^= key->contents[i];
/* compute the outer hash */
hashin[0].length = blocksize;
hashin[0].data = (char *) xorkey;
hashin[1] = hashout;
output->length = hashsize;
/* Solaris Kerberos */
if ((ret = ((*(hash->hash))(context, 2, hashin, output))))
(void) memset(output->data, 0, output->length);
/* ret is set correctly by the prior call */
cleanup:
/* Solaris Kerberos */
(void) memset(xorkey, 0, blocksize);
(void) memset(ihash, 0, hashsize);
FREE(hashin, sizeof(krb5_data)*(icount+1));
FREE(ihash, hashsize);
FREE(xorkey, blocksize);
/* Solaris Kerberos */
KRB5_LOG(KRB5_INFO, "krb5_hmac() end ret=%d\n", ret);
return(ret);
}
#endif /* _KERNEL */
|
