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/param.h>
30 #include <sys/systm.h>
31 #include <sys/malloc.h>
32
33 #include <opencrypto/xform.h>
34
35 #include "glxsb.h"
36
37 /*
38 * Implementation notes.
39 *
40 * The Geode LX Security Block provides AES-128-CBC acceleration.
41 * We implement all HMAC algorithms provided by crypto(9) framework so glxsb can work
42 * with ipsec(4)
43 *
44 * This code was stolen from crypto/via/padlock_hash.c
45 */
46
47 MALLOC_DECLARE(M_GLXSB);
48
49 static void
glxsb_hash_key_setup(struct glxsb_session * ses,const char * key,int klen)50 glxsb_hash_key_setup(struct glxsb_session *ses, const char *key, int klen)
51 {
52 const struct auth_hash *axf;
53
54 axf = ses->ses_axf;
55 hmac_init_ipad(axf, key, klen, ses->ses_ictx);
56 hmac_init_opad(axf, key, klen, ses->ses_octx);
57 }
58
59 /*
60 * Compute keyed-hash authenticator.
61 */
62 static int
glxsb_authcompute(struct glxsb_session * ses,struct cryptop * crp)63 glxsb_authcompute(struct glxsb_session *ses, struct cryptop *crp)
64 {
65 u_char hash[HASH_MAX_LEN];
66 const struct auth_hash *axf;
67 union authctx ctx;
68 int error;
69
70 axf = ses->ses_axf;
71 bcopy(ses->ses_ictx, &ctx, axf->ctxsize);
72 error = crypto_apply(crp, crp->crp_aad_start, crp->crp_aad_length,
73 axf->Update, &ctx);
74 if (error != 0)
75 return (error);
76 error = crypto_apply(crp, crp->crp_payload_start,
77 crp->crp_payload_length, axf->Update, &ctx);
78 if (error != 0)
79 return (error);
80
81 axf->Final(hash, &ctx);
82
83 bcopy(ses->ses_octx, &ctx, axf->ctxsize);
84 axf->Update(&ctx, hash, axf->hashsize);
85 axf->Final(hash, &ctx);
86 explicit_bzero(&ctx, sizeof(ctx));
87
88 /* Verify or inject the authentication data */
89 if (crp->crp_op & CRYPTO_OP_VERIFY_DIGEST) {
90 u_char hash2[HASH_MAX_LEN];
91
92 crypto_copydata(crp, crp->crp_digest_start, ses->ses_mlen,
93 hash2);
94 if (timingsafe_bcmp(hash, hash2, ses->ses_mlen) != 0)
95 error = EBADMSG;
96 explicit_bzero(hash2, sizeof(hash2));
97 } else
98 crypto_copyback(crp, crp->crp_digest_start, ses->ses_mlen,
99 hash);
100 explicit_bzero(hash, sizeof(hash));
101 return (error);
102 }
103
104 int
glxsb_hash_setup(struct glxsb_session * ses,const struct crypto_session_params * csp)105 glxsb_hash_setup(struct glxsb_session *ses,
106 const struct crypto_session_params *csp)
107 {
108
109 ses->ses_axf = crypto_auth_hash(csp);
110 if (csp->csp_auth_mlen == 0)
111 ses->ses_mlen = ses->ses_axf->hashsize;
112 else
113 ses->ses_mlen = csp->csp_auth_mlen;
114
115 /* Allocate memory for HMAC inner and outer contexts. */
116 ses->ses_ictx = malloc(ses->ses_axf->ctxsize, M_GLXSB,
117 M_ZERO | M_NOWAIT);
118 ses->ses_octx = malloc(ses->ses_axf->ctxsize, M_GLXSB,
119 M_ZERO | M_NOWAIT);
120 if (ses->ses_ictx == NULL || ses->ses_octx == NULL)
121 return (ENOMEM);
122
123 /* Setup key if given. */
124 if (csp->csp_auth_key != NULL) {
125 glxsb_hash_key_setup(ses, csp->csp_auth_key,
126 csp->csp_auth_klen);
127 }
128 return (0);
129 }
130
131 int
glxsb_hash_process(struct glxsb_session * ses,const struct crypto_session_params * csp,struct cryptop * crp)132 glxsb_hash_process(struct glxsb_session *ses,
133 const struct crypto_session_params *csp, struct cryptop *crp)
134 {
135 int error;
136
137 if (crp->crp_auth_key != NULL)
138 glxsb_hash_key_setup(ses, crp->crp_auth_key,
139 csp->csp_auth_klen);
140
141 error = glxsb_authcompute(ses, crp);
142 return (error);
143 }
144
145 void
glxsb_hash_free(struct glxsb_session * ses)146 glxsb_hash_free(struct glxsb_session *ses)
147 {
148
149 if (ses->ses_ictx != NULL) {
150 zfree(ses->ses_ictx, M_GLXSB);
151 ses->ses_ictx = NULL;
152 }
153 if (ses->ses_octx != NULL) {
154 zfree(ses->ses_octx, M_GLXSB);
155 ses->ses_octx = NULL;
156 }
157 }
158