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FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //sys/amd64/compile/hs32/modules/usr/src/sys/modules/i2c/iicbus/@/crypto/aesni/aesni_wrap.c |
/*-
* Copyright (c) 2010 Konstantin Belousov <kib@FreeBSD.org>
* Copyright (c) 2010 Pawel Jakub Dawidek <pjd@FreeBSD.org>
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/crypto/aesni/aesni_wrap.c 231979 2012-02-21 20:56:03Z kib $");
#include <sys/param.h>
#include <sys/libkern.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <crypto/aesni/aesni.h>
MALLOC_DECLARE(M_AESNI);
void
aesni_encrypt_cbc(int rounds, const void *key_schedule, size_t len,
const uint8_t *from, uint8_t *to, const uint8_t iv[AES_BLOCK_LEN])
{
const uint8_t *ivp;
size_t i;
len /= AES_BLOCK_LEN;
ivp = iv;
for (i = 0; i < len; i++) {
aesni_enc(rounds - 1, key_schedule, from, to, ivp);
ivp = to;
from += AES_BLOCK_LEN;
to += AES_BLOCK_LEN;
}
}
void
aesni_encrypt_ecb(int rounds, const void *key_schedule, size_t len,
const uint8_t from[AES_BLOCK_LEN], uint8_t to[AES_BLOCK_LEN])
{
size_t i;
len /= AES_BLOCK_LEN;
for (i = 0; i < len; i++) {
aesni_enc(rounds - 1, key_schedule, from, to, NULL);
from += AES_BLOCK_LEN;
to += AES_BLOCK_LEN;
}
}
void
aesni_decrypt_ecb(int rounds, const void *key_schedule, size_t len,
const uint8_t from[AES_BLOCK_LEN], uint8_t to[AES_BLOCK_LEN])
{
size_t i;
len /= AES_BLOCK_LEN;
for (i = 0; i < len; i++) {
aesni_dec(rounds - 1, key_schedule, from, to, NULL);
from += AES_BLOCK_LEN;
to += AES_BLOCK_LEN;
}
}
#define AES_XTS_BLOCKSIZE 16
#define AES_XTS_IVSIZE 8
#define AES_XTS_ALPHA 0x87 /* GF(2^128) generator polynomial */
static void
aesni_crypt_xts_block(int rounds, const void *key_schedule, uint8_t *tweak,
const uint8_t *from, uint8_t *to, int do_encrypt)
{
uint8_t block[AES_XTS_BLOCKSIZE];
u_int i, carry_in, carry_out;
for (i = 0; i < AES_XTS_BLOCKSIZE; i++)
block[i] = from[i] ^ tweak[i];
if (do_encrypt)
aesni_enc(rounds - 1, key_schedule, block, to, NULL);
else
aesni_dec(rounds - 1, key_schedule, block, to, NULL);
for (i = 0; i < AES_XTS_BLOCKSIZE; i++)
to[i] ^= tweak[i];
/* Exponentiate tweak. */
carry_in = 0;
for (i = 0; i < AES_XTS_BLOCKSIZE; i++) {
carry_out = tweak[i] & 0x80;
tweak[i] = (tweak[i] << 1) | (carry_in ? 1 : 0);
carry_in = carry_out;
}
if (carry_in)
tweak[0] ^= AES_XTS_ALPHA;
bzero(block, sizeof(block));
}
static void
aesni_crypt_xts(int rounds, const void *data_schedule,
const void *tweak_schedule, size_t len, const uint8_t *from, uint8_t *to,
const uint8_t iv[AES_BLOCK_LEN], int do_encrypt)
{
uint8_t tweak[AES_XTS_BLOCKSIZE];
uint64_t blocknum;
size_t i;
/*
* Prepare tweak as E_k2(IV). IV is specified as LE representation
* of a 64-bit block number which we allow to be passed in directly.
*/
bcopy(iv, &blocknum, AES_XTS_IVSIZE);
for (i = 0; i < AES_XTS_IVSIZE; i++) {
tweak[i] = blocknum & 0xff;
blocknum >>= 8;
}
/* Last 64 bits of IV are always zero. */
bzero(tweak + AES_XTS_IVSIZE, AES_XTS_IVSIZE);
aesni_enc(rounds - 1, tweak_schedule, tweak, tweak, NULL);
len /= AES_XTS_BLOCKSIZE;
for (i = 0; i < len; i++) {
aesni_crypt_xts_block(rounds, data_schedule, tweak, from, to,
do_encrypt);
from += AES_XTS_BLOCKSIZE;
to += AES_XTS_BLOCKSIZE;
}
bzero(tweak, sizeof(tweak));
}
static void
aesni_encrypt_xts(int rounds, const void *data_schedule,
const void *tweak_schedule, size_t len, const uint8_t *from, uint8_t *to,
const uint8_t iv[AES_BLOCK_LEN])
{
aesni_crypt_xts(rounds, data_schedule, tweak_schedule, len, from, to,
iv, 1);
}
static void
aesni_decrypt_xts(int rounds, const void *data_schedule,
const void *tweak_schedule, size_t len, const uint8_t *from, uint8_t *to,
const uint8_t iv[AES_BLOCK_LEN])
{
aesni_crypt_xts(rounds, data_schedule, tweak_schedule, len, from, to,
iv, 0);
}
static int
aesni_cipher_setup_common(struct aesni_session *ses, const uint8_t *key,
int keylen)
{
switch (ses->algo) {
case CRYPTO_AES_CBC:
switch (keylen) {
case 128:
ses->rounds = AES128_ROUNDS;
break;
case 192:
ses->rounds = AES192_ROUNDS;
break;
case 256:
ses->rounds = AES256_ROUNDS;
break;
default:
return (EINVAL);
}
break;
case CRYPTO_AES_XTS:
switch (keylen) {
case 256:
ses->rounds = AES128_ROUNDS;
break;
case 512:
ses->rounds = AES256_ROUNDS;
break;
default:
return (EINVAL);
}
break;
default:
return (EINVAL);
}
aesni_set_enckey(key, ses->enc_schedule, ses->rounds);
aesni_set_deckey(ses->enc_schedule, ses->dec_schedule, ses->rounds);
if (ses->algo == CRYPTO_AES_CBC)
arc4rand(ses->iv, sizeof(ses->iv), 0);
else /* if (ses->algo == CRYPTO_AES_XTS) */ {
aesni_set_enckey(key + keylen / 16, ses->xts_schedule,
ses->rounds);
}
return (0);
}
int
aesni_cipher_setup(struct aesni_session *ses, struct cryptoini *encini)
{
struct thread *td;
int error, saved_ctx;
td = curthread;
if (!is_fpu_kern_thread(0)) {
error = fpu_kern_enter(td, ses->fpu_ctx, FPU_KERN_NORMAL);
saved_ctx = 1;
} else {
error = 0;
saved_ctx = 0;
}
if (error == 0) {
error = aesni_cipher_setup_common(ses, encini->cri_key,
encini->cri_klen);
if (saved_ctx)
fpu_kern_leave(td, ses->fpu_ctx);
}
return (error);
}
int
aesni_cipher_process(struct aesni_session *ses, struct cryptodesc *enccrd,
struct cryptop *crp)
{
struct thread *td;
uint8_t *buf;
int error, allocated, saved_ctx;
buf = aesni_cipher_alloc(enccrd, crp, &allocated);
if (buf == NULL)
return (ENOMEM);
td = curthread;
if (!is_fpu_kern_thread(0)) {
error = fpu_kern_enter(td, ses->fpu_ctx, FPU_KERN_NORMAL);
if (error != 0)
goto out;
saved_ctx = 1;
} else {
saved_ctx = 0;
error = 0;
}
if ((enccrd->crd_flags & CRD_F_KEY_EXPLICIT) != 0) {
error = aesni_cipher_setup_common(ses, enccrd->crd_key,
enccrd->crd_klen);
if (error != 0)
goto out;
}
if ((enccrd->crd_flags & CRD_F_ENCRYPT) != 0) {
if ((enccrd->crd_flags & CRD_F_IV_EXPLICIT) != 0)
bcopy(enccrd->crd_iv, ses->iv, AES_BLOCK_LEN);
if ((enccrd->crd_flags & CRD_F_IV_PRESENT) == 0)
crypto_copyback(crp->crp_flags, crp->crp_buf,
enccrd->crd_inject, AES_BLOCK_LEN, ses->iv);
if (ses->algo == CRYPTO_AES_CBC) {
aesni_encrypt_cbc(ses->rounds, ses->enc_schedule,
enccrd->crd_len, buf, buf, ses->iv);
} else /* if (ses->algo == CRYPTO_AES_XTS) */ {
aesni_encrypt_xts(ses->rounds, ses->enc_schedule,
ses->xts_schedule, enccrd->crd_len, buf, buf,
ses->iv);
}
} else {
if ((enccrd->crd_flags & CRD_F_IV_EXPLICIT) != 0)
bcopy(enccrd->crd_iv, ses->iv, AES_BLOCK_LEN);
else
crypto_copydata(crp->crp_flags, crp->crp_buf,
enccrd->crd_inject, AES_BLOCK_LEN, ses->iv);
if (ses->algo == CRYPTO_AES_CBC) {
aesni_decrypt_cbc(ses->rounds, ses->dec_schedule,
enccrd->crd_len, buf, ses->iv);
} else /* if (ses->algo == CRYPTO_AES_XTS) */ {
aesni_decrypt_xts(ses->rounds, ses->dec_schedule,
ses->xts_schedule, enccrd->crd_len, buf, buf,
ses->iv);
}
}
if (saved_ctx)
fpu_kern_leave(td, ses->fpu_ctx);
if (allocated)
crypto_copyback(crp->crp_flags, crp->crp_buf, enccrd->crd_skip,
enccrd->crd_len, buf);
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->iv);
out:
if (allocated) {
bzero(buf, enccrd->crd_len);
free(buf, M_AESNI);
}
return (error);
}