diff options
Diffstat (limited to 'sys/crypto/via/padlock_cipher.c')
| -rw-r--r-- | sys/crypto/via/padlock_cipher.c | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/sys/crypto/via/padlock_cipher.c b/sys/crypto/via/padlock_cipher.c new file mode 100644 index 0000000..d881a8b --- /dev/null +++ b/sys/crypto/via/padlock_cipher.c @@ -0,0 +1,226 @@ +/*- + * Copyright (c) 2005-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org> + * Copyright (c) 2004 Mark R V Murray + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +/* $OpenBSD: via.c,v 1.3 2004/06/15 23:36:55 deraadt Exp $ */ +/*- + * Copyright (c) 2003 Jason Wright + * Copyright (c) 2003, 2004 Theo de Raadt + * All rights reserved. + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/module.h> +#include <sys/malloc.h> +#include <sys/libkern.h> + +#include <opencrypto/cryptodev.h> +#include <crypto/rijndael/rijndael.h> + +#include <crypto/via/padlock.h> + +#define PADLOCK_ROUND_COUNT_AES128 10 +#define PADLOCK_ROUND_COUNT_AES192 12 +#define PADLOCK_ROUND_COUNT_AES256 14 + +#define PADLOCK_ALGORITHM_TYPE_AES 0 + +#define PADLOCK_KEY_GENERATION_HW 0 +#define PADLOCK_KEY_GENERATION_SW 1 + +#define PADLOCK_DIRECTION_ENCRYPT 0 +#define PADLOCK_DIRECTION_DECRYPT 1 + +#define PADLOCK_KEY_SIZE_128 0 +#define PADLOCK_KEY_SIZE_192 1 +#define PADLOCK_KEY_SIZE_256 2 + +MALLOC_DECLARE(M_PADLOCK); + +static __inline void +padlock_cbc(void *in, void *out, size_t count, void *key, union padlock_cw *cw, + void *iv) +{ +#ifdef __GNUCLIKE_ASM + /* The .byte line is really VIA C3 "xcrypt-cbc" instruction */ + __asm __volatile( + "pushf \n\t" + "popf \n\t" + "rep \n\t" + ".byte 0x0f, 0xa7, 0xd0" + : "+a" (iv), "+c" (count), "+D" (out), "+S" (in) + : "b" (key), "d" (cw) + : "cc", "memory" + ); +#endif +} + +static void +padlock_cipher_key_setup(struct padlock_session *ses, caddr_t key, int klen) +{ + union padlock_cw *cw; + int i; + + cw = &ses->ses_cw; + if (cw->cw_key_generation == PADLOCK_KEY_GENERATION_SW) { + /* Build expanded keys for both directions */ + rijndaelKeySetupEnc(ses->ses_ekey, key, klen); + rijndaelKeySetupDec(ses->ses_dkey, key, klen); + for (i = 0; i < 4 * (RIJNDAEL_MAXNR + 1); i++) { + ses->ses_ekey[i] = ntohl(ses->ses_ekey[i]); + ses->ses_dkey[i] = ntohl(ses->ses_dkey[i]); + } + } else { + bcopy(key, ses->ses_ekey, klen); + bcopy(key, ses->ses_dkey, klen); + } +} + +int +padlock_cipher_setup(struct padlock_session *ses, struct cryptoini *encini) +{ + union padlock_cw *cw; + + if (encini->cri_klen != 128 && encini->cri_klen != 192 && + encini->cri_klen != 256) { + return (EINVAL); + } + + cw = &ses->ses_cw; + bzero(cw, sizeof(*cw)); + cw->cw_algorithm_type = PADLOCK_ALGORITHM_TYPE_AES; + cw->cw_key_generation = PADLOCK_KEY_GENERATION_SW; + cw->cw_intermediate = 0; + switch (encini->cri_klen) { + case 128: + cw->cw_round_count = PADLOCK_ROUND_COUNT_AES128; + cw->cw_key_size = PADLOCK_KEY_SIZE_128; +#ifdef HW_KEY_GENERATION + /* This doesn't buy us much, that's why it is commented out. */ + cw->cw_key_generation = PADLOCK_KEY_GENERATION_HW; +#endif + break; + case 192: + cw->cw_round_count = PADLOCK_ROUND_COUNT_AES192; + cw->cw_key_size = PADLOCK_KEY_SIZE_192; + break; + case 256: + cw->cw_round_count = PADLOCK_ROUND_COUNT_AES256; + cw->cw_key_size = PADLOCK_KEY_SIZE_256; + break; + } + if (encini->cri_key != NULL) { + padlock_cipher_key_setup(ses, encini->cri_key, + encini->cri_klen); + } + + arc4rand(ses->ses_iv, sizeof(ses->ses_iv), 0); + return (0); +} + +int +padlock_cipher_process(struct padlock_session *ses, struct cryptodesc *enccrd, + struct cryptop *crp) +{ + union padlock_cw *cw; + u_char *buf, *abuf; + uint32_t *key; + + buf = malloc(enccrd->crd_len + 16, M_PADLOCK, M_NOWAIT); + if (buf == NULL) + return (ENOMEM); + /* Buffer has to be 16 bytes aligned. */ + abuf = PADLOCK_ALIGN(buf); + + if ((enccrd->crd_flags & CRD_F_KEY_EXPLICIT) != 0) { + padlock_cipher_key_setup(ses, enccrd->crd_key, + enccrd->crd_klen); + } + + cw = &ses->ses_cw; + cw->cw_filler0 = 0; + cw->cw_filler1 = 0; + cw->cw_filler2 = 0; + cw->cw_filler3 = 0; + if ((enccrd->crd_flags & CRD_F_ENCRYPT) != 0) { + cw->cw_direction = PADLOCK_DIRECTION_ENCRYPT; + key = ses->ses_ekey; + if ((enccrd->crd_flags & CRD_F_IV_EXPLICIT) != 0) + bcopy(enccrd->crd_iv, ses->ses_iv, 16); + + if ((enccrd->crd_flags & CRD_F_IV_PRESENT) == 0) { + crypto_copyback(crp->crp_flags, crp->crp_buf, + enccrd->crd_inject, AES_BLOCK_LEN, ses->ses_iv); + } + } else { + cw->cw_direction = PADLOCK_DIRECTION_DECRYPT; + key = ses->ses_dkey; + if ((enccrd->crd_flags & CRD_F_IV_EXPLICIT) != 0) + bcopy(enccrd->crd_iv, ses->ses_iv, AES_BLOCK_LEN); + else { + crypto_copydata(crp->crp_flags, crp->crp_buf, + enccrd->crd_inject, AES_BLOCK_LEN, ses->ses_iv); + } + } + + crypto_copydata(crp->crp_flags, crp->crp_buf, enccrd->crd_skip, + enccrd->crd_len, abuf); + + padlock_cbc(abuf, abuf, enccrd->crd_len / 16, key, cw, ses->ses_iv); + + crypto_copyback(crp->crp_flags, crp->crp_buf, enccrd->crd_skip, + enccrd->crd_len, abuf); + + /* copy out last block for use as next session IV */ + if ((enccrd->crd_flags & CRD_F_ENCRYPT) != 0) { + crypto_copydata(crp->crp_flags, crp->crp_buf, + enccrd->crd_skip + enccrd->crd_len - AES_BLOCK_LEN, + AES_BLOCK_LEN, ses->ses_iv); + } + + if (buf != NULL) { + bzero(buf, enccrd->crd_len + 16); + free(buf, M_PADLOCK); + } + return (0); +} |
