1 /*
2 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
3 * Use is subject to license terms.
4 */
5
6
7 /*
8 * Copyright (C) 1998 by the FundsXpress, INC.
9 *
10 * All rights reserved.
11 *
12 * Export of this software from the United States of America may require
13 * a specific license from the United States Government. It is the
14 * responsibility of any person or organization contemplating export to
15 * 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 FundsXpress. not be used in advertising or publicity pertaining
23 * to distribution of the software without specific, written prior
24 * permission. FundsXpress makes no representations about the suitability of
25 * this software for any purpose. It is provided "as is" without express
26 * or implied warranty.
27 *
28 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
29 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
30 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
31 */
32
33 #include "k5-int.h"
34
35 /* Solaris Kerberos */
36 #ifdef _KERNEL
37 /*
38 * In kernel, use the Kernel encryption framework HMAC
39 * operation, its far more efficient than the MIT method.
40 * Also, a template is used to further improve performance.
41 */
42 /* ARGSUSED */
43 krb5_error_code
krb5_hmac(krb5_context context,const krb5_keyblock * key,krb5_const krb5_data * input,krb5_data * output)44 krb5_hmac(krb5_context context, const krb5_keyblock *key,
45 krb5_const krb5_data *input, krb5_data *output)
46 {
47 int rv = CRYPTO_FAILED;
48 crypto_mechanism_t mac_mech;
49 crypto_data_t dd;
50 crypto_data_t mac;
51
52 KRB5_LOG0(KRB5_INFO, "krb5_hmac() start");
53 if (output == NULL || output->data == NULL) {
54 KRB5_LOG0(KRB5_INFO, "krb5_hmac() NULL output");
55 return (rv);
56 }
57 if (input == NULL || input->data == NULL) {
58 KRB5_LOG0(KRB5_INFO, "krb5_hmac() NULL input");
59 return (rv);
60 }
61
62 dd.cd_format = CRYPTO_DATA_RAW;
63 dd.cd_offset = 0;
64 dd.cd_length = input->length;
65 dd.cd_raw.iov_base = (char *)input->data;
66 dd.cd_raw.iov_len = input->length;
67
68 mac.cd_format = CRYPTO_DATA_RAW;
69 mac.cd_offset = 0;
70 mac.cd_length = output->length;
71 mac.cd_raw.iov_base = (char *)output->data;
72 mac.cd_raw.iov_len = output->length;
73
74 mac_mech.cm_type = context->kef_hash_mt;
75 mac_mech.cm_param = NULL;
76 mac_mech.cm_param_len = 0;
77
78 rv = crypto_mac(&mac_mech, &dd,
79 (crypto_key_t *)&key->kef_key,
80 key->key_tmpl, &mac, NULL);
81
82 if (rv != CRYPTO_SUCCESS) {
83 KRB5_LOG(KRB5_ERR,"crypto_mac error: %0x", rv);
84 }
85
86 KRB5_LOG(KRB5_INFO, "krb5_hmac() end ret=%d\n", rv);
87 return(rv);
88 }
89
90 #else
91 /* Userland implementation of HMAC algorithm */
92
93 /*
94 * the HMAC transform looks like:
95 *
96 * H(K XOR opad, H(K XOR ipad, text))
97 *
98 * where H is a cryptographic hash
99 * K is an n byte key
100 * ipad is the byte 0x36 repeated blocksize times
101 * opad is the byte 0x5c repeated blocksize times
102 * and text is the data being protected
103 */
104
105 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)106 krb5_hmac(krb5_context context,
107 krb5_const struct krb5_hash_provider *hash,
108 krb5_const krb5_keyblock *key,
109 krb5_const unsigned int icount,
110 krb5_const krb5_data *input,
111 krb5_data *output)
112 {
113 size_t hashsize, blocksize;
114 unsigned char *xorkey, *ihash;
115 int i;
116 krb5_data *hashin, hashout;
117 krb5_error_code ret;
118
119 /* Solaris Kerberos */
120 KRB5_LOG0(KRB5_INFO, "krb5_hmac() start\n");
121
122 if (hash == NULL) {
123 KRB5_LOG0(KRB5_ERR, "krb5_hmac() error hash == NULL\n");
124 return(EINVAL);
125 }
126 if (key == NULL) {
127 KRB5_LOG0(KRB5_ERR, "krb5_hmac() error key == NULL\n");
128 return(EINVAL);
129 }
130 if (input == NULL) {
131 KRB5_LOG0(KRB5_ERR, "krb5_hmac() error input == NULL\n");
132 return(EINVAL);
133 }
134 if (output == NULL) {
135 KRB5_LOG0(KRB5_ERR, "krb5_hmac() error output == NULL\n");
136 return(EINVAL);
137 }
138
139 hashsize = hash->hashsize;
140 blocksize = hash->blocksize;
141
142 if (key->length > blocksize)
143 return(KRB5_CRYPTO_INTERNAL);
144 if (output->length < hashsize)
145 return(KRB5_BAD_MSIZE);
146 /* if this isn't > 0, then there won't be enough space in this
147 array to compute the outer hash */
148 if (icount == 0)
149 return(KRB5_CRYPTO_INTERNAL);
150
151 /* allocate space for the xor key, hash input vector, and inner hash */
152
153 if ((xorkey = (unsigned char *) MALLOC(blocksize)) == NULL)
154 return(ENOMEM);
155 if ((ihash = (unsigned char *) MALLOC(hashsize)) == NULL) {
156 FREE(xorkey, blocksize);
157 return(ENOMEM);
158 }
159 if ((hashin = (krb5_data *)MALLOC(sizeof(krb5_data)*(icount+1))) == NULL) {
160 FREE(ihash, hashsize);
161 FREE(xorkey, blocksize);
162 return(ENOMEM);
163 }
164
165 /* create the inner padded key */
166
167 /* Solaris Kerberos */
168 (void) memset(xorkey, 0x36, blocksize);
169
170 for (i=0; i<key->length; i++)
171 xorkey[i] ^= key->contents[i];
172
173 /* compute the inner hash */
174
175 for (i=0; i<icount; i++) {
176 hashin[0].length = blocksize;
177 hashin[0].data = (char *) xorkey;
178 hashin[i+1] = input[i];
179 }
180
181 hashout.length = hashsize;
182 hashout.data = (char *) ihash;
183
184 /* Solaris Kerberos */
185 if ((ret = ((*(hash->hash))(context, icount+1, hashin, &hashout))))
186 goto cleanup;
187
188 /* create the outer padded key */
189
190 /* Solaris Kerberos */
191 (void) memset(xorkey, 0x5c, blocksize);
192
193 for (i=0; i<key->length; i++)
194 xorkey[i] ^= key->contents[i];
195
196 /* compute the outer hash */
197
198 hashin[0].length = blocksize;
199 hashin[0].data = (char *) xorkey;
200 hashin[1] = hashout;
201
202 output->length = hashsize;
203
204 /* Solaris Kerberos */
205 if ((ret = ((*(hash->hash))(context, 2, hashin, output))))
206 (void) memset(output->data, 0, output->length);
207
208 /* ret is set correctly by the prior call */
209
210 cleanup:
211 /* Solaris Kerberos */
212 (void) memset(xorkey, 0, blocksize);
213 (void) memset(ihash, 0, hashsize);
214
215 FREE(hashin, sizeof(krb5_data)*(icount+1));
216 FREE(ihash, hashsize);
217 FREE(xorkey, blocksize);
218
219 /* Solaris Kerberos */
220 KRB5_LOG(KRB5_INFO, "krb5_hmac() end ret=%d\n", ret);
221 return(ret);
222 }
223 #endif /* _KERNEL */
224