glxsb_hash.c revision 181467 
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: head/sys/dev/glxsb/glxsb_hash.c 181467 2008-08-09 14:52:31Z philip $");
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	}
97	axf->Final(hash, &ctx);
98
99	bcopy(ses->ses_octx, &ctx, axf->ctxsize);
100	axf->Update(&ctx, hash, axf->hashsize);
101	axf->Final(hash, &ctx);
102
103	/* Inject the authentication data */
104	crypto_copyback(flags, buf, crd->crd_inject,
105	ses->ses_mlen == 0 ? axf->hashsize : ses->ses_mlen, hash);
106	return (0);
107}
108
109int
110glxsb_hash_setup(struct glxsb_session *ses, struct cryptoini *macini)
111{
112
113	ses->ses_mlen = macini->cri_mlen;
114
115	/* Find software structure which describes HMAC algorithm. */
116	switch (macini->cri_alg) {
117	case CRYPTO_NULL_HMAC:
118		ses->ses_axf = &auth_hash_null;
119		break;
120	case CRYPTO_MD5_HMAC:
121		ses->ses_axf = &auth_hash_hmac_md5;
122		break;
123	case CRYPTO_SHA1_HMAC:
124		ses->ses_axf = &auth_hash_hmac_sha1;
125		break;
126	case CRYPTO_RIPEMD160_HMAC:
127		ses->ses_axf = &auth_hash_hmac_ripemd_160;
128		break;
129	case CRYPTO_SHA2_256_HMAC:
130		ses->ses_axf = &auth_hash_hmac_sha2_256;
131		break;
132	case CRYPTO_SHA2_384_HMAC:
133		ses->ses_axf = &auth_hash_hmac_sha2_384;
134		break;
135	case CRYPTO_SHA2_512_HMAC:
136		ses->ses_axf = &auth_hash_hmac_sha2_512;
137		break;
138	}
139
140	/* Allocate memory for HMAC inner and outer contexts. */
141	ses->ses_ictx = malloc(ses->ses_axf->ctxsize, M_GLXSB,
142	    M_ZERO | M_NOWAIT);
143	ses->ses_octx = malloc(ses->ses_axf->ctxsize, M_GLXSB,
144	    M_ZERO | M_NOWAIT);
145	if (ses->ses_ictx == NULL || ses->ses_octx == NULL)
146		return (ENOMEM);
147
148	/* Setup key if given. */
149	if (macini->cri_key != NULL) {
150		glxsb_hash_key_setup(ses, macini->cri_key,
151		    macini->cri_klen);
152	}
153	return (0);
154}
155
156int
157glxsb_hash_process(struct glxsb_session *ses, struct cryptodesc *maccrd,
158    struct cryptop *crp)
159{
160	int error;
161
162	if ((maccrd->crd_flags & CRD_F_KEY_EXPLICIT) != 0)
163		glxsb_hash_key_setup(ses, maccrd->crd_key, maccrd->crd_klen);
164
165	error = glxsb_authcompute(ses, maccrd, crp->crp_buf, crp->crp_flags);
166	return (error);
167}
168
169void
170glxsb_hash_free(struct glxsb_session *ses)
171{
172
173	if (ses->ses_ictx != NULL) {
174		bzero(ses->ses_ictx, ses->ses_axf->ctxsize);
175		free(ses->ses_ictx, M_GLXSB);
176		ses->ses_ictx = NULL;
177	}
178	if (ses->ses_octx != NULL) {
179		bzero(ses->ses_octx, ses->ses_axf->ctxsize);
180		free(ses->ses_octx, M_GLXSB);
181		ses->ses_octx = NULL;
182	}
183}
184