linux/crypto/simd.c
Martin Kepplinger 1af39daaad crypto: replace FSF address with web source in license notices
A few years ago the FSF moved and "59 Temple Place" is wrong. Having this
still in our source files feels old and unmaintained.

Let's take the license statement serious and not confuse users.

As https://www.gnu.org/licenses/gpl-howto.html suggests, we replace the
postal address with "<http://www.gnu.org/licenses/>".

Signed-off-by: Martin Kepplinger <martink@posteo.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2017-11-29 17:33:25 +11:00

225 lines
6.0 KiB
C

/*
* Shared crypto simd helpers
*
* Copyright (c) 2012 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
* Copyright (c) 2016 Herbert Xu <herbert@gondor.apana.org.au>
*
* Based on aesni-intel_glue.c by:
* Copyright (C) 2008, Intel Corp.
* Author: Huang Ying <ying.huang@intel.com>
*
* 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, see <http://www.gnu.org/licenses/>.
*
*/
#include <crypto/cryptd.h>
#include <crypto/internal/simd.h>
#include <crypto/internal/skcipher.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/preempt.h>
#include <asm/simd.h>
struct simd_skcipher_alg {
const char *ialg_name;
struct skcipher_alg alg;
};
struct simd_skcipher_ctx {
struct cryptd_skcipher *cryptd_tfm;
};
static int simd_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int key_len)
{
struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
struct crypto_skcipher *child = &ctx->cryptd_tfm->base;
int err;
crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
crypto_skcipher_set_flags(child, crypto_skcipher_get_flags(tfm) &
CRYPTO_TFM_REQ_MASK);
err = crypto_skcipher_setkey(child, key, key_len);
crypto_skcipher_set_flags(tfm, crypto_skcipher_get_flags(child) &
CRYPTO_TFM_RES_MASK);
return err;
}
static int simd_skcipher_encrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
struct skcipher_request *subreq;
struct crypto_skcipher *child;
subreq = skcipher_request_ctx(req);
*subreq = *req;
if (!may_use_simd() ||
(in_atomic() && cryptd_skcipher_queued(ctx->cryptd_tfm)))
child = &ctx->cryptd_tfm->base;
else
child = cryptd_skcipher_child(ctx->cryptd_tfm);
skcipher_request_set_tfm(subreq, child);
return crypto_skcipher_encrypt(subreq);
}
static int simd_skcipher_decrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
struct skcipher_request *subreq;
struct crypto_skcipher *child;
subreq = skcipher_request_ctx(req);
*subreq = *req;
if (!may_use_simd() ||
(in_atomic() && cryptd_skcipher_queued(ctx->cryptd_tfm)))
child = &ctx->cryptd_tfm->base;
else
child = cryptd_skcipher_child(ctx->cryptd_tfm);
skcipher_request_set_tfm(subreq, child);
return crypto_skcipher_decrypt(subreq);
}
static void simd_skcipher_exit(struct crypto_skcipher *tfm)
{
struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
cryptd_free_skcipher(ctx->cryptd_tfm);
}
static int simd_skcipher_init(struct crypto_skcipher *tfm)
{
struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
struct cryptd_skcipher *cryptd_tfm;
struct simd_skcipher_alg *salg;
struct skcipher_alg *alg;
unsigned reqsize;
alg = crypto_skcipher_alg(tfm);
salg = container_of(alg, struct simd_skcipher_alg, alg);
cryptd_tfm = cryptd_alloc_skcipher(salg->ialg_name,
CRYPTO_ALG_INTERNAL,
CRYPTO_ALG_INTERNAL);
if (IS_ERR(cryptd_tfm))
return PTR_ERR(cryptd_tfm);
ctx->cryptd_tfm = cryptd_tfm;
reqsize = sizeof(struct skcipher_request);
reqsize += crypto_skcipher_reqsize(&cryptd_tfm->base);
crypto_skcipher_set_reqsize(tfm, reqsize);
return 0;
}
struct simd_skcipher_alg *simd_skcipher_create_compat(const char *algname,
const char *drvname,
const char *basename)
{
struct simd_skcipher_alg *salg;
struct crypto_skcipher *tfm;
struct skcipher_alg *ialg;
struct skcipher_alg *alg;
int err;
tfm = crypto_alloc_skcipher(basename, CRYPTO_ALG_INTERNAL,
CRYPTO_ALG_INTERNAL | CRYPTO_ALG_ASYNC);
if (IS_ERR(tfm))
return ERR_CAST(tfm);
ialg = crypto_skcipher_alg(tfm);
salg = kzalloc(sizeof(*salg), GFP_KERNEL);
if (!salg) {
salg = ERR_PTR(-ENOMEM);
goto out_put_tfm;
}
salg->ialg_name = basename;
alg = &salg->alg;
err = -ENAMETOOLONG;
if (snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", algname) >=
CRYPTO_MAX_ALG_NAME)
goto out_free_salg;
if (snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
drvname) >= CRYPTO_MAX_ALG_NAME)
goto out_free_salg;
alg->base.cra_flags = CRYPTO_ALG_ASYNC;
alg->base.cra_priority = ialg->base.cra_priority;
alg->base.cra_blocksize = ialg->base.cra_blocksize;
alg->base.cra_alignmask = ialg->base.cra_alignmask;
alg->base.cra_module = ialg->base.cra_module;
alg->base.cra_ctxsize = sizeof(struct simd_skcipher_ctx);
alg->ivsize = ialg->ivsize;
alg->chunksize = ialg->chunksize;
alg->min_keysize = ialg->min_keysize;
alg->max_keysize = ialg->max_keysize;
alg->init = simd_skcipher_init;
alg->exit = simd_skcipher_exit;
alg->setkey = simd_skcipher_setkey;
alg->encrypt = simd_skcipher_encrypt;
alg->decrypt = simd_skcipher_decrypt;
err = crypto_register_skcipher(alg);
if (err)
goto out_free_salg;
out_put_tfm:
crypto_free_skcipher(tfm);
return salg;
out_free_salg:
kfree(salg);
salg = ERR_PTR(err);
goto out_put_tfm;
}
EXPORT_SYMBOL_GPL(simd_skcipher_create_compat);
struct simd_skcipher_alg *simd_skcipher_create(const char *algname,
const char *basename)
{
char drvname[CRYPTO_MAX_ALG_NAME];
if (snprintf(drvname, CRYPTO_MAX_ALG_NAME, "simd-%s", basename) >=
CRYPTO_MAX_ALG_NAME)
return ERR_PTR(-ENAMETOOLONG);
return simd_skcipher_create_compat(algname, drvname, basename);
}
EXPORT_SYMBOL_GPL(simd_skcipher_create);
void simd_skcipher_free(struct simd_skcipher_alg *salg)
{
crypto_unregister_skcipher(&salg->alg);
kfree(salg);
}
EXPORT_SYMBOL_GPL(simd_skcipher_free);
MODULE_LICENSE("GPL");