1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/malloc.h>
33
34 #include <opencrypto/xform.h>
35
36 #include "glxsb.h"
37
38 /*
39 * Implementation notes.
40 *
41 * The Geode LX Security Block provides AES-128-CBC acceleration.
42 * We implement all HMAC algorithms provided by crypto(9) framework so glxsb can work
43 * with ipsec(4)
44 *
45 * This code was stolen from crypto/via/padlock_hash.c
46 */
47
48 MALLOC_DECLARE(M_GLXSB);
49
50 static void
glxsb_hash_key_setup(struct glxsb_session * ses,const char * key,int klen)51 glxsb_hash_key_setup(struct glxsb_session *ses, const char *key, int klen)
52 {
53 struct auth_hash *axf;
54
55 axf = ses->ses_axf;
56 hmac_init_ipad(axf, key, klen, ses->ses_ictx);
57 hmac_init_opad(axf, key, klen, ses->ses_octx);
58 }
59
60 /*
61 * Compute keyed-hash authenticator.
62 */
63 static int
glxsb_authcompute(struct glxsb_session * ses,struct cryptop * crp)64 glxsb_authcompute(struct glxsb_session *ses, struct cryptop *crp)
65 {
66 u_char hash[HASH_MAX_LEN];
67 struct auth_hash *axf;
68 union authctx ctx;
69 int error;
70
71 axf = ses->ses_axf;
72 bcopy(ses->ses_ictx, &ctx, axf->ctxsize);
73 error = crypto_apply(crp, crp->crp_aad_start, crp->crp_aad_length,
74 axf->Update, &ctx);
75 if (error != 0)
76 return (error);
77 error = crypto_apply(crp, crp->crp_payload_start,
78 crp->crp_payload_length, axf->Update, &ctx);
79 if (error != 0)
80 return (error);
81
82 axf->Final(hash, &ctx);
83
84 bcopy(ses->ses_octx, &ctx, axf->ctxsize);
85 axf->Update(&ctx, hash, axf->hashsize);
86 axf->Final(hash, &ctx);
87 explicit_bzero(&ctx, sizeof(ctx));
88
89 /* Verify or inject the authentication data */
90 if (crp->crp_op & CRYPTO_OP_VERIFY_DIGEST) {
91 u_char hash2[HASH_MAX_LEN];
92
93 crypto_copydata(crp, crp->crp_digest_start, ses->ses_mlen,
94 hash2);
95 if (timingsafe_bcmp(hash, hash2, ses->ses_mlen) != 0)
96 error = EBADMSG;
97 explicit_bzero(hash2, sizeof(hash2));
98 } else
99 crypto_copyback(crp, crp->crp_digest_start, ses->ses_mlen,
100 hash);
101 explicit_bzero(hash, sizeof(hash));
102 return (error);
103 }
104
105 int
glxsb_hash_setup(struct glxsb_session * ses,const struct crypto_session_params * csp)106 glxsb_hash_setup(struct glxsb_session *ses,
107 const struct crypto_session_params *csp)
108 {
109
110 ses->ses_axf = crypto_auth_hash(csp);
111 if (csp->csp_auth_mlen == 0)
112 ses->ses_mlen = ses->ses_axf->hashsize;
113 else
114 ses->ses_mlen = csp->csp_auth_mlen;
115
116 /* Allocate memory for HMAC inner and outer contexts. */
117 ses->ses_ictx = malloc(ses->ses_axf->ctxsize, M_GLXSB,
118 M_ZERO | M_NOWAIT);
119 ses->ses_octx = malloc(ses->ses_axf->ctxsize, M_GLXSB,
120 M_ZERO | M_NOWAIT);
121 if (ses->ses_ictx == NULL || ses->ses_octx == NULL)
122 return (ENOMEM);
123
124 /* Setup key if given. */
125 if (csp->csp_auth_key != NULL) {
126 glxsb_hash_key_setup(ses, csp->csp_auth_key,
127 csp->csp_auth_klen);
128 }
129 return (0);
130 }
131
132 int
glxsb_hash_process(struct glxsb_session * ses,const struct crypto_session_params * csp,struct cryptop * crp)133 glxsb_hash_process(struct glxsb_session *ses,
134 const struct crypto_session_params *csp, struct cryptop *crp)
135 {
136 int error;
137
138 if (crp->crp_auth_key != NULL)
139 glxsb_hash_key_setup(ses, crp->crp_auth_key,
140 csp->csp_auth_klen);
141
142 error = glxsb_authcompute(ses, crp);
143 return (error);
144 }
145
146 void
glxsb_hash_free(struct glxsb_session * ses)147 glxsb_hash_free(struct glxsb_session *ses)
148 {
149
150 if (ses->ses_ictx != NULL) {
151 zfree(ses->ses_ictx, M_GLXSB);
152 ses->ses_ictx = NULL;
153 }
154 if (ses->ses_octx != NULL) {
155 zfree(ses->ses_octx, M_GLXSB);
156 ses->ses_octx = NULL;
157 }
158 }
159