492 строки
12 KiB
C
492 строки
12 KiB
C
/*
|
|
* Glue Code for the AVX assembler implemention of the Cast5 Cipher
|
|
*
|
|
* Copyright (C) 2012 Johannes Goetzfried
|
|
* <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
|
|
* USA
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/hardirq.h>
|
|
#include <linux/types.h>
|
|
#include <linux/crypto.h>
|
|
#include <linux/err.h>
|
|
#include <crypto/ablk_helper.h>
|
|
#include <crypto/algapi.h>
|
|
#include <crypto/cast5.h>
|
|
#include <crypto/cryptd.h>
|
|
#include <crypto/ctr.h>
|
|
#include <asm/fpu/api.h>
|
|
#include <asm/crypto/glue_helper.h>
|
|
|
|
#define CAST5_PARALLEL_BLOCKS 16
|
|
|
|
asmlinkage void cast5_ecb_enc_16way(struct cast5_ctx *ctx, u8 *dst,
|
|
const u8 *src);
|
|
asmlinkage void cast5_ecb_dec_16way(struct cast5_ctx *ctx, u8 *dst,
|
|
const u8 *src);
|
|
asmlinkage void cast5_cbc_dec_16way(struct cast5_ctx *ctx, u8 *dst,
|
|
const u8 *src);
|
|
asmlinkage void cast5_ctr_16way(struct cast5_ctx *ctx, u8 *dst, const u8 *src,
|
|
__be64 *iv);
|
|
|
|
static inline bool cast5_fpu_begin(bool fpu_enabled, unsigned int nbytes)
|
|
{
|
|
return glue_fpu_begin(CAST5_BLOCK_SIZE, CAST5_PARALLEL_BLOCKS,
|
|
NULL, fpu_enabled, nbytes);
|
|
}
|
|
|
|
static inline void cast5_fpu_end(bool fpu_enabled)
|
|
{
|
|
return glue_fpu_end(fpu_enabled);
|
|
}
|
|
|
|
static int ecb_crypt(struct blkcipher_desc *desc, struct blkcipher_walk *walk,
|
|
bool enc)
|
|
{
|
|
bool fpu_enabled = false;
|
|
struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
|
|
const unsigned int bsize = CAST5_BLOCK_SIZE;
|
|
unsigned int nbytes;
|
|
void (*fn)(struct cast5_ctx *ctx, u8 *dst, const u8 *src);
|
|
int err;
|
|
|
|
fn = (enc) ? cast5_ecb_enc_16way : cast5_ecb_dec_16way;
|
|
|
|
err = blkcipher_walk_virt(desc, walk);
|
|
desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
|
|
|
|
while ((nbytes = walk->nbytes)) {
|
|
u8 *wsrc = walk->src.virt.addr;
|
|
u8 *wdst = walk->dst.virt.addr;
|
|
|
|
fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes);
|
|
|
|
/* Process multi-block batch */
|
|
if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
|
|
do {
|
|
fn(ctx, wdst, wsrc);
|
|
|
|
wsrc += bsize * CAST5_PARALLEL_BLOCKS;
|
|
wdst += bsize * CAST5_PARALLEL_BLOCKS;
|
|
nbytes -= bsize * CAST5_PARALLEL_BLOCKS;
|
|
} while (nbytes >= bsize * CAST5_PARALLEL_BLOCKS);
|
|
|
|
if (nbytes < bsize)
|
|
goto done;
|
|
}
|
|
|
|
fn = (enc) ? __cast5_encrypt : __cast5_decrypt;
|
|
|
|
/* Handle leftovers */
|
|
do {
|
|
fn(ctx, wdst, wsrc);
|
|
|
|
wsrc += bsize;
|
|
wdst += bsize;
|
|
nbytes -= bsize;
|
|
} while (nbytes >= bsize);
|
|
|
|
done:
|
|
err = blkcipher_walk_done(desc, walk, nbytes);
|
|
}
|
|
|
|
cast5_fpu_end(fpu_enabled);
|
|
return err;
|
|
}
|
|
|
|
static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
|
|
struct scatterlist *src, unsigned int nbytes)
|
|
{
|
|
struct blkcipher_walk walk;
|
|
|
|
blkcipher_walk_init(&walk, dst, src, nbytes);
|
|
return ecb_crypt(desc, &walk, true);
|
|
}
|
|
|
|
static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
|
|
struct scatterlist *src, unsigned int nbytes)
|
|
{
|
|
struct blkcipher_walk walk;
|
|
|
|
blkcipher_walk_init(&walk, dst, src, nbytes);
|
|
return ecb_crypt(desc, &walk, false);
|
|
}
|
|
|
|
static unsigned int __cbc_encrypt(struct blkcipher_desc *desc,
|
|
struct blkcipher_walk *walk)
|
|
{
|
|
struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
|
|
const unsigned int bsize = CAST5_BLOCK_SIZE;
|
|
unsigned int nbytes = walk->nbytes;
|
|
u64 *src = (u64 *)walk->src.virt.addr;
|
|
u64 *dst = (u64 *)walk->dst.virt.addr;
|
|
u64 *iv = (u64 *)walk->iv;
|
|
|
|
do {
|
|
*dst = *src ^ *iv;
|
|
__cast5_encrypt(ctx, (u8 *)dst, (u8 *)dst);
|
|
iv = dst;
|
|
|
|
src += 1;
|
|
dst += 1;
|
|
nbytes -= bsize;
|
|
} while (nbytes >= bsize);
|
|
|
|
*(u64 *)walk->iv = *iv;
|
|
return nbytes;
|
|
}
|
|
|
|
static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
|
|
struct scatterlist *src, unsigned int nbytes)
|
|
{
|
|
struct blkcipher_walk walk;
|
|
int err;
|
|
|
|
blkcipher_walk_init(&walk, dst, src, nbytes);
|
|
err = blkcipher_walk_virt(desc, &walk);
|
|
|
|
while ((nbytes = walk.nbytes)) {
|
|
nbytes = __cbc_encrypt(desc, &walk);
|
|
err = blkcipher_walk_done(desc, &walk, nbytes);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static unsigned int __cbc_decrypt(struct blkcipher_desc *desc,
|
|
struct blkcipher_walk *walk)
|
|
{
|
|
struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
|
|
const unsigned int bsize = CAST5_BLOCK_SIZE;
|
|
unsigned int nbytes = walk->nbytes;
|
|
u64 *src = (u64 *)walk->src.virt.addr;
|
|
u64 *dst = (u64 *)walk->dst.virt.addr;
|
|
u64 last_iv;
|
|
|
|
/* Start of the last block. */
|
|
src += nbytes / bsize - 1;
|
|
dst += nbytes / bsize - 1;
|
|
|
|
last_iv = *src;
|
|
|
|
/* Process multi-block batch */
|
|
if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
|
|
do {
|
|
nbytes -= bsize * (CAST5_PARALLEL_BLOCKS - 1);
|
|
src -= CAST5_PARALLEL_BLOCKS - 1;
|
|
dst -= CAST5_PARALLEL_BLOCKS - 1;
|
|
|
|
cast5_cbc_dec_16way(ctx, (u8 *)dst, (u8 *)src);
|
|
|
|
nbytes -= bsize;
|
|
if (nbytes < bsize)
|
|
goto done;
|
|
|
|
*dst ^= *(src - 1);
|
|
src -= 1;
|
|
dst -= 1;
|
|
} while (nbytes >= bsize * CAST5_PARALLEL_BLOCKS);
|
|
}
|
|
|
|
/* Handle leftovers */
|
|
for (;;) {
|
|
__cast5_decrypt(ctx, (u8 *)dst, (u8 *)src);
|
|
|
|
nbytes -= bsize;
|
|
if (nbytes < bsize)
|
|
break;
|
|
|
|
*dst ^= *(src - 1);
|
|
src -= 1;
|
|
dst -= 1;
|
|
}
|
|
|
|
done:
|
|
*dst ^= *(u64 *)walk->iv;
|
|
*(u64 *)walk->iv = last_iv;
|
|
|
|
return nbytes;
|
|
}
|
|
|
|
static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
|
|
struct scatterlist *src, unsigned int nbytes)
|
|
{
|
|
bool fpu_enabled = false;
|
|
struct blkcipher_walk walk;
|
|
int err;
|
|
|
|
blkcipher_walk_init(&walk, dst, src, nbytes);
|
|
err = blkcipher_walk_virt(desc, &walk);
|
|
desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
|
|
|
|
while ((nbytes = walk.nbytes)) {
|
|
fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes);
|
|
nbytes = __cbc_decrypt(desc, &walk);
|
|
err = blkcipher_walk_done(desc, &walk, nbytes);
|
|
}
|
|
|
|
cast5_fpu_end(fpu_enabled);
|
|
return err;
|
|
}
|
|
|
|
static void ctr_crypt_final(struct blkcipher_desc *desc,
|
|
struct blkcipher_walk *walk)
|
|
{
|
|
struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
|
|
u8 *ctrblk = walk->iv;
|
|
u8 keystream[CAST5_BLOCK_SIZE];
|
|
u8 *src = walk->src.virt.addr;
|
|
u8 *dst = walk->dst.virt.addr;
|
|
unsigned int nbytes = walk->nbytes;
|
|
|
|
__cast5_encrypt(ctx, keystream, ctrblk);
|
|
crypto_xor(keystream, src, nbytes);
|
|
memcpy(dst, keystream, nbytes);
|
|
|
|
crypto_inc(ctrblk, CAST5_BLOCK_SIZE);
|
|
}
|
|
|
|
static unsigned int __ctr_crypt(struct blkcipher_desc *desc,
|
|
struct blkcipher_walk *walk)
|
|
{
|
|
struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
|
|
const unsigned int bsize = CAST5_BLOCK_SIZE;
|
|
unsigned int nbytes = walk->nbytes;
|
|
u64 *src = (u64 *)walk->src.virt.addr;
|
|
u64 *dst = (u64 *)walk->dst.virt.addr;
|
|
|
|
/* Process multi-block batch */
|
|
if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
|
|
do {
|
|
cast5_ctr_16way(ctx, (u8 *)dst, (u8 *)src,
|
|
(__be64 *)walk->iv);
|
|
|
|
src += CAST5_PARALLEL_BLOCKS;
|
|
dst += CAST5_PARALLEL_BLOCKS;
|
|
nbytes -= bsize * CAST5_PARALLEL_BLOCKS;
|
|
} while (nbytes >= bsize * CAST5_PARALLEL_BLOCKS);
|
|
|
|
if (nbytes < bsize)
|
|
goto done;
|
|
}
|
|
|
|
/* Handle leftovers */
|
|
do {
|
|
u64 ctrblk;
|
|
|
|
if (dst != src)
|
|
*dst = *src;
|
|
|
|
ctrblk = *(u64 *)walk->iv;
|
|
be64_add_cpu((__be64 *)walk->iv, 1);
|
|
|
|
__cast5_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
|
|
*dst ^= ctrblk;
|
|
|
|
src += 1;
|
|
dst += 1;
|
|
nbytes -= bsize;
|
|
} while (nbytes >= bsize);
|
|
|
|
done:
|
|
return nbytes;
|
|
}
|
|
|
|
static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
|
|
struct scatterlist *src, unsigned int nbytes)
|
|
{
|
|
bool fpu_enabled = false;
|
|
struct blkcipher_walk walk;
|
|
int err;
|
|
|
|
blkcipher_walk_init(&walk, dst, src, nbytes);
|
|
err = blkcipher_walk_virt_block(desc, &walk, CAST5_BLOCK_SIZE);
|
|
desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
|
|
|
|
while ((nbytes = walk.nbytes) >= CAST5_BLOCK_SIZE) {
|
|
fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes);
|
|
nbytes = __ctr_crypt(desc, &walk);
|
|
err = blkcipher_walk_done(desc, &walk, nbytes);
|
|
}
|
|
|
|
cast5_fpu_end(fpu_enabled);
|
|
|
|
if (walk.nbytes) {
|
|
ctr_crypt_final(desc, &walk);
|
|
err = blkcipher_walk_done(desc, &walk, 0);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
|
|
static struct crypto_alg cast5_algs[6] = { {
|
|
.cra_name = "__ecb-cast5-avx",
|
|
.cra_driver_name = "__driver-ecb-cast5-avx",
|
|
.cra_priority = 0,
|
|
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
|
|
CRYPTO_ALG_INTERNAL,
|
|
.cra_blocksize = CAST5_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct cast5_ctx),
|
|
.cra_alignmask = 0,
|
|
.cra_type = &crypto_blkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_u = {
|
|
.blkcipher = {
|
|
.min_keysize = CAST5_MIN_KEY_SIZE,
|
|
.max_keysize = CAST5_MAX_KEY_SIZE,
|
|
.setkey = cast5_setkey,
|
|
.encrypt = ecb_encrypt,
|
|
.decrypt = ecb_decrypt,
|
|
},
|
|
},
|
|
}, {
|
|
.cra_name = "__cbc-cast5-avx",
|
|
.cra_driver_name = "__driver-cbc-cast5-avx",
|
|
.cra_priority = 0,
|
|
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
|
|
CRYPTO_ALG_INTERNAL,
|
|
.cra_blocksize = CAST5_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct cast5_ctx),
|
|
.cra_alignmask = 0,
|
|
.cra_type = &crypto_blkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_u = {
|
|
.blkcipher = {
|
|
.min_keysize = CAST5_MIN_KEY_SIZE,
|
|
.max_keysize = CAST5_MAX_KEY_SIZE,
|
|
.setkey = cast5_setkey,
|
|
.encrypt = cbc_encrypt,
|
|
.decrypt = cbc_decrypt,
|
|
},
|
|
},
|
|
}, {
|
|
.cra_name = "__ctr-cast5-avx",
|
|
.cra_driver_name = "__driver-ctr-cast5-avx",
|
|
.cra_priority = 0,
|
|
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
|
|
CRYPTO_ALG_INTERNAL,
|
|
.cra_blocksize = 1,
|
|
.cra_ctxsize = sizeof(struct cast5_ctx),
|
|
.cra_alignmask = 0,
|
|
.cra_type = &crypto_blkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_u = {
|
|
.blkcipher = {
|
|
.min_keysize = CAST5_MIN_KEY_SIZE,
|
|
.max_keysize = CAST5_MAX_KEY_SIZE,
|
|
.ivsize = CAST5_BLOCK_SIZE,
|
|
.setkey = cast5_setkey,
|
|
.encrypt = ctr_crypt,
|
|
.decrypt = ctr_crypt,
|
|
},
|
|
},
|
|
}, {
|
|
.cra_name = "ecb(cast5)",
|
|
.cra_driver_name = "ecb-cast5-avx",
|
|
.cra_priority = 200,
|
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
|
|
.cra_blocksize = CAST5_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct async_helper_ctx),
|
|
.cra_alignmask = 0,
|
|
.cra_type = &crypto_ablkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_init = ablk_init,
|
|
.cra_exit = ablk_exit,
|
|
.cra_u = {
|
|
.ablkcipher = {
|
|
.min_keysize = CAST5_MIN_KEY_SIZE,
|
|
.max_keysize = CAST5_MAX_KEY_SIZE,
|
|
.setkey = ablk_set_key,
|
|
.encrypt = ablk_encrypt,
|
|
.decrypt = ablk_decrypt,
|
|
},
|
|
},
|
|
}, {
|
|
.cra_name = "cbc(cast5)",
|
|
.cra_driver_name = "cbc-cast5-avx",
|
|
.cra_priority = 200,
|
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
|
|
.cra_blocksize = CAST5_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct async_helper_ctx),
|
|
.cra_alignmask = 0,
|
|
.cra_type = &crypto_ablkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_init = ablk_init,
|
|
.cra_exit = ablk_exit,
|
|
.cra_u = {
|
|
.ablkcipher = {
|
|
.min_keysize = CAST5_MIN_KEY_SIZE,
|
|
.max_keysize = CAST5_MAX_KEY_SIZE,
|
|
.ivsize = CAST5_BLOCK_SIZE,
|
|
.setkey = ablk_set_key,
|
|
.encrypt = __ablk_encrypt,
|
|
.decrypt = ablk_decrypt,
|
|
},
|
|
},
|
|
}, {
|
|
.cra_name = "ctr(cast5)",
|
|
.cra_driver_name = "ctr-cast5-avx",
|
|
.cra_priority = 200,
|
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
|
|
.cra_blocksize = 1,
|
|
.cra_ctxsize = sizeof(struct async_helper_ctx),
|
|
.cra_alignmask = 0,
|
|
.cra_type = &crypto_ablkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_init = ablk_init,
|
|
.cra_exit = ablk_exit,
|
|
.cra_u = {
|
|
.ablkcipher = {
|
|
.min_keysize = CAST5_MIN_KEY_SIZE,
|
|
.max_keysize = CAST5_MAX_KEY_SIZE,
|
|
.ivsize = CAST5_BLOCK_SIZE,
|
|
.setkey = ablk_set_key,
|
|
.encrypt = ablk_encrypt,
|
|
.decrypt = ablk_encrypt,
|
|
.geniv = "chainiv",
|
|
},
|
|
},
|
|
} };
|
|
|
|
static int __init cast5_init(void)
|
|
{
|
|
const char *feature_name;
|
|
|
|
if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
|
|
&feature_name)) {
|
|
pr_info("CPU feature '%s' is not supported.\n", feature_name);
|
|
return -ENODEV;
|
|
}
|
|
|
|
return crypto_register_algs(cast5_algs, ARRAY_SIZE(cast5_algs));
|
|
}
|
|
|
|
static void __exit cast5_exit(void)
|
|
{
|
|
crypto_unregister_algs(cast5_algs, ARRAY_SIZE(cast5_algs));
|
|
}
|
|
|
|
module_init(cast5_init);
|
|
module_exit(cast5_exit);
|
|
|
|
MODULE_DESCRIPTION("Cast5 Cipher Algorithm, AVX optimized");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_CRYPTO("cast5");
|