glxsb_hash.c revision 302408 
1/*-
2 * Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: stable/11/sys/dev/glxsb/glxsb_hash.c 181593 2008-08-11 08:41:08Z pjd $");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/malloc.h>
33
34#include <opencrypto/cryptosoft.h> /* for hmac_ipad_buffer and hmac_opad_buffer */
35#include <opencrypto/xform.h>
36
37#include "glxsb.h"
38
39/*
40 * Implementation notes.
41 *
42 * The Geode LX Security Block provides AES-128-CBC acceleration.
43 * We implement all HMAC algorithms provided by crypto(9) framework so glxsb can work
44 * with ipsec(4)
45 *
46 * This code was stolen from crypto/via/padlock_hash.c
47 */
48
49MALLOC_DECLARE(M_GLXSB);
50
51static void
52glxsb_hash_key_setup(struct glxsb_session *ses, caddr_t key, int klen)
53{
54	struct auth_hash *axf;
55	int i;
56
57	klen /= 8;
58	axf = ses->ses_axf;
59
60	for (i = 0; i < klen; i++)
61		key[i] ^= HMAC_IPAD_VAL;
62
63	axf->Init(ses->ses_ictx);
64	axf->Update(ses->ses_ictx, key, klen);
65	axf->Update(ses->ses_ictx, hmac_ipad_buffer, axf->blocksize - klen);
66
67	for (i = 0; i < klen; i++)
68		key[i] ^= (HMAC_IPAD_VAL ^ HMAC_OPAD_VAL);
69
70	axf->Init(ses->ses_octx);
71	axf->Update(ses->ses_octx, key, klen);
72	axf->Update(ses->ses_octx, hmac_opad_buffer, axf->blocksize - klen);
73
74	for (i = 0; i < klen; i++)
75		key[i] ^= HMAC_OPAD_VAL;
76}
77
78/*
79 * Compute keyed-hash authenticator.
80 */
81static int
82glxsb_authcompute(struct glxsb_session *ses, struct cryptodesc *crd,
83    caddr_t buf, int flags)
84{
85	u_char hash[HASH_MAX_LEN];
86	struct auth_hash *axf;
87	union authctx ctx;
88	int error;
89
90	axf = ses->ses_axf;
91	bcopy(ses->ses_ictx, &ctx, axf->ctxsize);
92	error = crypto_apply(flags, buf, crd->crd_skip, crd->crd_len,
93	    (int (*)(void *, void *, unsigned int))axf->Update, (caddr_t)&ctx);
94	if (error != 0)
95		return (error);
96	axf->Final(hash, &ctx);
97
98	bcopy(ses->ses_octx, &ctx, axf->ctxsize);
99	axf->Update(&ctx, hash, axf->hashsize);
100	axf->Final(hash, &ctx);
101
102	/* Inject the authentication data */
103	crypto_copyback(flags, buf, crd->crd_inject,
104	ses->ses_mlen == 0 ? axf->hashsize : ses->ses_mlen, hash);
105	return (0);
106}
107
108int
109glxsb_hash_setup(struct glxsb_session *ses, struct cryptoini *macini)
110{
111
112	ses->ses_mlen = macini->cri_mlen;
113
114	/* Find software structure which describes HMAC algorithm. */
115	switch (macini->cri_alg) {
116	case CRYPTO_NULL_HMAC:
117		ses->ses_axf = &auth_hash_null;
118		break;
119	case CRYPTO_MD5_HMAC:
120		ses->ses_axf = &auth_hash_hmac_md5;
121		break;
122	case CRYPTO_SHA1_HMAC:
123		ses->ses_axf = &auth_hash_hmac_sha1;
124		break;
125	case CRYPTO_RIPEMD160_HMAC:
126		ses->ses_axf = &auth_hash_hmac_ripemd_160;
127		break;
128	case CRYPTO_SHA2_256_HMAC:
129		ses->ses_axf = &auth_hash_hmac_sha2_256;
130		break;
131	case CRYPTO_SHA2_384_HMAC:
132		ses->ses_axf = &auth_hash_hmac_sha2_384;
133		break;
134	case CRYPTO_SHA2_512_HMAC:
135		ses->ses_axf = &auth_hash_hmac_sha2_512;
136		break;
137	}
138
139	/* Allocate memory for HMAC inner and outer contexts. */
140	ses->ses_ictx = malloc(ses->ses_axf->ctxsize, M_GLXSB,
141	    M_ZERO | M_NOWAIT);
142	ses->ses_octx = malloc(ses->ses_axf->ctxsize, M_GLXSB,
143	    M_ZERO | M_NOWAIT);
144	if (ses->ses_ictx == NULL || ses->ses_octx == NULL)
145		return (ENOMEM);
146
147	/* Setup key if given. */
148	if (macini->cri_key != NULL) {
149		glxsb_hash_key_setup(ses, macini->cri_key,
150		    macini->cri_klen);
151	}
152	return (0);
153}
154
155int
156glxsb_hash_process(struct glxsb_session *ses, struct cryptodesc *maccrd,
157    struct cryptop *crp)
158{
159	int error;
160
161	if ((maccrd->crd_flags & CRD_F_KEY_EXPLICIT) != 0)
162		glxsb_hash_key_setup(ses, maccrd->crd_key, maccrd->crd_klen);
163
164	error = glxsb_authcompute(ses, maccrd, crp->crp_buf, crp->crp_flags);
165	return (error);
166}
167
168void
169glxsb_hash_free(struct glxsb_session *ses)
170{
171
172	if (ses->ses_ictx != NULL) {
173		bzero(ses->ses_ictx, ses->ses_axf->ctxsize);
174		free(ses->ses_ictx, M_GLXSB);
175		ses->ses_ictx = NULL;
176	}
177	if (ses->ses_octx != NULL) {
178		bzero(ses->ses_octx, ses->ses_axf->ctxsize);
179		free(ses->ses_octx, M_GLXSB);
180		ses->ses_octx = NULL;
181	}
182}
183