1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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__FBSDID("$FreeBSD$");
31
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/malloc.h>
35
36#include <opencrypto/xform.h>
37
38#include "glxsb.h"
39
40/*
41 * Implementation notes.
42 *
43 * The Geode LX Security Block provides AES-128-CBC acceleration.
44 * We implement all HMAC algorithms provided by crypto(9) framework so glxsb can work
45 * with ipsec(4)
46 *
47 * This code was stolen from crypto/via/padlock_hash.c
48 */
49
50MALLOC_DECLARE(M_GLXSB);
51
52static void
53glxsb_hash_key_setup(struct glxsb_session *ses, const char *key, int klen)
54{
55	struct auth_hash *axf;
56
57	axf = ses->ses_axf;
58	hmac_init_ipad(axf, key, klen, ses->ses_ictx);
59	hmac_init_opad(axf, key, klen, ses->ses_octx);
60}
61
62/*
63 * Compute keyed-hash authenticator.
64 */
65static int
66glxsb_authcompute(struct glxsb_session *ses, struct cryptop *crp)
67{
68	u_char hash[HASH_MAX_LEN];
69	struct auth_hash *axf;
70	union authctx ctx;
71	int error;
72
73	axf = ses->ses_axf;
74	bcopy(ses->ses_ictx, &ctx, axf->ctxsize);
75	error = crypto_apply(crp, crp->crp_aad_start, crp->crp_aad_length,
76	    axf->Update, &ctx);
77	if (error != 0)
78		return (error);
79	error = crypto_apply(crp, crp->crp_payload_start,
80	    crp->crp_payload_length, axf->Update, &ctx);
81	if (error != 0)
82		return (error);
83
84	axf->Final(hash, &ctx);
85
86	bcopy(ses->ses_octx, &ctx, axf->ctxsize);
87	axf->Update(&ctx, hash, axf->hashsize);
88	axf->Final(hash, &ctx);
89	explicit_bzero(&ctx, sizeof(ctx));
90
91	/* Verify or inject the authentication data */
92	if (crp->crp_op & CRYPTO_OP_VERIFY_DIGEST) {
93		u_char hash2[HASH_MAX_LEN];
94
95		crypto_copydata(crp, crp->crp_digest_start, ses->ses_mlen,
96		    hash2);
97		if (timingsafe_bcmp(hash, hash2, ses->ses_mlen) != 0)
98			error = EBADMSG;
99		explicit_bzero(hash2, sizeof(hash2));
100	} else
101		crypto_copyback(crp, crp->crp_digest_start, ses->ses_mlen,
102		    hash);
103	explicit_bzero(hash, sizeof(hash));
104	return (error);
105}
106
107int
108glxsb_hash_setup(struct glxsb_session *ses,
109    const struct crypto_session_params *csp)
110{
111
112	ses->ses_axf = crypto_auth_hash(csp);
113	if (csp->csp_auth_mlen == 0)
114		ses->ses_mlen = ses->ses_axf->hashsize;
115	else
116		ses->ses_mlen = csp->csp_auth_mlen;
117
118	/* Allocate memory for HMAC inner and outer contexts. */
119	ses->ses_ictx = malloc(ses->ses_axf->ctxsize, M_GLXSB,
120	    M_ZERO | M_NOWAIT);
121	ses->ses_octx = malloc(ses->ses_axf->ctxsize, M_GLXSB,
122	    M_ZERO | M_NOWAIT);
123	if (ses->ses_ictx == NULL || ses->ses_octx == NULL)
124		return (ENOMEM);
125
126	/* Setup key if given. */
127	if (csp->csp_auth_key != NULL) {
128		glxsb_hash_key_setup(ses, csp->csp_auth_key,
129		    csp->csp_auth_klen);
130	}
131	return (0);
132}
133
134int
135glxsb_hash_process(struct glxsb_session *ses,
136    const struct crypto_session_params *csp, struct cryptop *crp)
137{
138	int error;
139
140	if (crp->crp_auth_key != NULL)
141		glxsb_hash_key_setup(ses, crp->crp_auth_key,
142		    csp->csp_auth_klen);
143
144	error = glxsb_authcompute(ses, crp);
145	return (error);
146}
147
148void
149glxsb_hash_free(struct glxsb_session *ses)
150{
151
152	if (ses->ses_ictx != NULL) {
153		zfree(ses->ses_ictx, M_GLXSB);
154		ses->ses_ictx = NULL;
155	}
156	if (ses->ses_octx != NULL) {
157		zfree(ses->ses_octx, M_GLXSB);
158		ses->ses_octx = NULL;
159	}
160}
161