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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
crypto: create generic version of ablk_helper
Create a generic version of ablk_helper so it can be reused
by other architectures.
Acked-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
authored by
Ard Biesheuvel
and committed by
Herbert Xu
a62b01cd
714b33d1
+200
+4
crypto/Kconfig
+4
crypto/Kconfig
+1
crypto/Makefile
+1
crypto/Makefile
+150
crypto/ablk_helper.c
+150
crypto/ablk_helper.c
···
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/*
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* Shared async block cipher helpers
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*
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* Copyright (c) 2012 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
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*
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* Based on aesni-intel_glue.c by:
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* Copyright (C) 2008, Intel Corp.
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* Author: Huang Ying <ying.huang@intel.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*
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*/
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#include <linux/kernel.h>
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#include <linux/crypto.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/hardirq.h>
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#include <crypto/algapi.h>
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#include <crypto/cryptd.h>
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#include <crypto/ablk_helper.h>
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#include <asm/simd.h>
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int ablk_set_key(struct crypto_ablkcipher *tfm, const u8 *key,
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unsigned int key_len)
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{
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struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
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struct crypto_ablkcipher *child = &ctx->cryptd_tfm->base;
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int err;
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crypto_ablkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
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crypto_ablkcipher_set_flags(child, crypto_ablkcipher_get_flags(tfm)
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& CRYPTO_TFM_REQ_MASK);
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err = crypto_ablkcipher_setkey(child, key, key_len);
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crypto_ablkcipher_set_flags(tfm, crypto_ablkcipher_get_flags(child)
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& CRYPTO_TFM_RES_MASK);
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return err;
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}
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EXPORT_SYMBOL_GPL(ablk_set_key);
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int __ablk_encrypt(struct ablkcipher_request *req)
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{
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struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
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struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
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struct blkcipher_desc desc;
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desc.tfm = cryptd_ablkcipher_child(ctx->cryptd_tfm);
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desc.info = req->info;
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desc.flags = 0;
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return crypto_blkcipher_crt(desc.tfm)->encrypt(
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&desc, req->dst, req->src, req->nbytes);
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}
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EXPORT_SYMBOL_GPL(__ablk_encrypt);
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int ablk_encrypt(struct ablkcipher_request *req)
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{
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struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
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struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
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if (!may_use_simd()) {
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struct ablkcipher_request *cryptd_req =
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ablkcipher_request_ctx(req);
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memcpy(cryptd_req, req, sizeof(*req));
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ablkcipher_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base);
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return crypto_ablkcipher_encrypt(cryptd_req);
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} else {
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return __ablk_encrypt(req);
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}
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}
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EXPORT_SYMBOL_GPL(ablk_encrypt);
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int ablk_decrypt(struct ablkcipher_request *req)
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{
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struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
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struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
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if (!may_use_simd()) {
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struct ablkcipher_request *cryptd_req =
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ablkcipher_request_ctx(req);
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memcpy(cryptd_req, req, sizeof(*req));
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ablkcipher_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base);
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return crypto_ablkcipher_decrypt(cryptd_req);
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} else {
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struct blkcipher_desc desc;
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desc.tfm = cryptd_ablkcipher_child(ctx->cryptd_tfm);
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desc.info = req->info;
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desc.flags = 0;
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return crypto_blkcipher_crt(desc.tfm)->decrypt(
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&desc, req->dst, req->src, req->nbytes);
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}
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}
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EXPORT_SYMBOL_GPL(ablk_decrypt);
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void ablk_exit(struct crypto_tfm *tfm)
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{
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struct async_helper_ctx *ctx = crypto_tfm_ctx(tfm);
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cryptd_free_ablkcipher(ctx->cryptd_tfm);
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}
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EXPORT_SYMBOL_GPL(ablk_exit);
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int ablk_init_common(struct crypto_tfm *tfm, const char *drv_name)
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{
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struct async_helper_ctx *ctx = crypto_tfm_ctx(tfm);
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struct cryptd_ablkcipher *cryptd_tfm;
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cryptd_tfm = cryptd_alloc_ablkcipher(drv_name, 0, 0);
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if (IS_ERR(cryptd_tfm))
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return PTR_ERR(cryptd_tfm);
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ctx->cryptd_tfm = cryptd_tfm;
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tfm->crt_ablkcipher.reqsize = sizeof(struct ablkcipher_request) +
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crypto_ablkcipher_reqsize(&cryptd_tfm->base);
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return 0;
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}
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EXPORT_SYMBOL_GPL(ablk_init_common);
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int ablk_init(struct crypto_tfm *tfm)
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{
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char drv_name[CRYPTO_MAX_ALG_NAME];
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snprintf(drv_name, sizeof(drv_name), "__driver-%s",
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crypto_tfm_alg_driver_name(tfm));
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return ablk_init_common(tfm, drv_name);
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}
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EXPORT_SYMBOL_GPL(ablk_init);
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MODULE_LICENSE("GPL");
+14
include/asm-generic/simd.h
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include/asm-generic/simd.h
···
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#include <linux/hardirq.h>
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/*
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* may_use_simd - whether it is allowable at this time to issue SIMD
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* instructions or access the SIMD register file
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*
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* As architectures typically don't preserve the SIMD register file when
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* taking an interrupt, !in_interrupt() should be a reasonable default.
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*/
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static __must_check inline bool may_use_simd(void)
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{
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return !in_interrupt();
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}
+31
include/crypto/ablk_helper.h
+31
include/crypto/ablk_helper.h
···
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/*
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* Shared async block cipher helpers
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*/
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#ifndef _CRYPTO_ABLK_HELPER_H
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#define _CRYPTO_ABLK_HELPER_H
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#include <linux/crypto.h>
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#include <linux/kernel.h>
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#include <crypto/cryptd.h>
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struct async_helper_ctx {
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struct cryptd_ablkcipher *cryptd_tfm;
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};
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extern int ablk_set_key(struct crypto_ablkcipher *tfm, const u8 *key,
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unsigned int key_len);
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extern int __ablk_encrypt(struct ablkcipher_request *req);
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extern int ablk_encrypt(struct ablkcipher_request *req);
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extern int ablk_decrypt(struct ablkcipher_request *req);
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extern void ablk_exit(struct crypto_tfm *tfm);
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extern int ablk_init_common(struct crypto_tfm *tfm, const char *drv_name);
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extern int ablk_init(struct crypto_tfm *tfm);
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#endif /* _CRYPTO_ABLK_HELPER_H */