2 * Copyright (c) 2005-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
3 * Copyright (c) 2004 Mark R V Murray
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 /* $OpenBSD: via.c,v 1.3 2004/06/15 23:36:55 deraadt Exp $ */
30 * Copyright (c) 2003 Jason Wright
31 * Copyright (c) 2003, 2004 Theo de Raadt
32 * All rights reserved.
34 * Permission to use, copy, modify, and distribute this software for any
35 * purpose with or without fee is hereby granted, provided that the above
36 * copyright notice and this permission notice appear in all copies.
38 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
39 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
40 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
41 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
42 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
43 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
44 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/kernel.h>
50 #include <sys/module.h>
51 #include <sys/malloc.h>
52 #include <sys/libkern.h>
55 #include <machine/fpu.h>
57 #include <opencrypto/cryptodev.h>
58 #include <crypto/rijndael/rijndael.h>
60 #include <crypto/via/padlock.h>
62 #define PADLOCK_ROUND_COUNT_AES128 10
63 #define PADLOCK_ROUND_COUNT_AES192 12
64 #define PADLOCK_ROUND_COUNT_AES256 14
66 #define PADLOCK_ALGORITHM_TYPE_AES 0
68 #define PADLOCK_KEY_GENERATION_HW 0
69 #define PADLOCK_KEY_GENERATION_SW 1
71 #define PADLOCK_DIRECTION_ENCRYPT 0
72 #define PADLOCK_DIRECTION_DECRYPT 1
74 #define PADLOCK_KEY_SIZE_128 0
75 #define PADLOCK_KEY_SIZE_192 1
76 #define PADLOCK_KEY_SIZE_256 2
78 MALLOC_DECLARE(M_PADLOCK);
81 padlock_cbc(void *in, void *out, size_t count, void *key, union padlock_cw *cw,
84 /* The .byte line is really VIA C3 "xcrypt-cbc" instruction */
89 ".byte 0x0f, 0xa7, 0xd0"
90 : "+a" (iv), "+c" (count), "+D" (out), "+S" (in)
97 padlock_cipher_key_setup(struct padlock_session *ses, const void *key, int klen)
103 if (cw->cw_key_generation == PADLOCK_KEY_GENERATION_SW) {
104 /* Build expanded keys for both directions */
105 rijndaelKeySetupEnc(ses->ses_ekey, key, klen * 8);
106 rijndaelKeySetupDec(ses->ses_dkey, key, klen * 8);
107 for (i = 0; i < 4 * (RIJNDAEL_MAXNR + 1); i++) {
108 ses->ses_ekey[i] = ntohl(ses->ses_ekey[i]);
109 ses->ses_dkey[i] = ntohl(ses->ses_dkey[i]);
112 bcopy(key, ses->ses_ekey, klen);
113 bcopy(key, ses->ses_dkey, klen);
118 padlock_cipher_setup(struct padlock_session *ses,
119 const struct crypto_session_params *csp)
121 union padlock_cw *cw;
123 if (csp->csp_cipher_klen != 16 && csp->csp_cipher_klen != 24 &&
124 csp->csp_cipher_klen != 32) {
129 bzero(cw, sizeof(*cw));
130 cw->cw_algorithm_type = PADLOCK_ALGORITHM_TYPE_AES;
131 cw->cw_key_generation = PADLOCK_KEY_GENERATION_SW;
132 cw->cw_intermediate = 0;
133 switch (csp->csp_cipher_klen * 8) {
135 cw->cw_round_count = PADLOCK_ROUND_COUNT_AES128;
136 cw->cw_key_size = PADLOCK_KEY_SIZE_128;
137 #ifdef HW_KEY_GENERATION
138 /* This doesn't buy us much, that's why it is commented out. */
139 cw->cw_key_generation = PADLOCK_KEY_GENERATION_HW;
143 cw->cw_round_count = PADLOCK_ROUND_COUNT_AES192;
144 cw->cw_key_size = PADLOCK_KEY_SIZE_192;
147 cw->cw_round_count = PADLOCK_ROUND_COUNT_AES256;
148 cw->cw_key_size = PADLOCK_KEY_SIZE_256;
151 if (csp->csp_cipher_key != NULL) {
152 padlock_cipher_key_setup(ses, csp->csp_cipher_key,
153 csp->csp_cipher_klen);
159 * Function checks if the given buffer is already 16 bytes aligned.
160 * If it is there is no need to allocate new buffer.
161 * If it isn't, new buffer is allocated.
164 padlock_cipher_alloc(struct cryptop *crp, int *allocated)
168 addr = crypto_contiguous_subsegment(crp, crp->crp_payload_start,
169 crp->crp_payload_length);
170 if (((uintptr_t)addr & 0xf) == 0) { /* 16 bytes aligned? */
176 addr = malloc(crp->crp_payload_length + 16, M_PADLOCK, M_NOWAIT);
181 padlock_cipher_process(struct padlock_session *ses, struct cryptop *crp,
182 const struct crypto_session_params *csp)
184 union padlock_cw *cw;
188 uint8_t iv[AES_BLOCK_LEN] __aligned(16);
191 buf = padlock_cipher_alloc(crp, &allocated);
194 /* Buffer has to be 16 bytes aligned. */
195 abuf = PADLOCK_ALIGN(buf);
197 if (crp->crp_cipher_key != NULL) {
198 padlock_cipher_key_setup(ses, crp->crp_cipher_key,
199 csp->csp_cipher_klen);
208 crypto_read_iv(crp, iv);
210 if (CRYPTO_OP_IS_ENCRYPT(crp->crp_op)) {
211 cw->cw_direction = PADLOCK_DIRECTION_ENCRYPT;
214 cw->cw_direction = PADLOCK_DIRECTION_DECRYPT;
219 crypto_copydata(crp, crp->crp_payload_start,
220 crp->crp_payload_length, abuf);
224 fpu_kern_enter(td, NULL, FPU_KERN_NORMAL | FPU_KERN_NOCTX);
225 padlock_cbc(abuf, abuf, crp->crp_payload_length / AES_BLOCK_LEN, key,
227 fpu_kern_leave(td, NULL);
230 crypto_copyback(crp, crp->crp_payload_start,
231 crp->crp_payload_length, abuf);
233 zfree(buf, M_PADLOCK);