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crypto: simd - Add simd skcipher helper
This patch adds the simd skcipher helper which is meant to be a replacement for ablk helper. It replaces the underlying blkcipher interface with skcipher, and also presents the top-level algorithm as an skcipher. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Herbert Xu
parent
4e0958d19b
commit
266d051601
@ -246,6 +246,10 @@ config CRYPTO_ABLK_HELPER
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tristate
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select CRYPTO_CRYPTD
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config CRYPTO_SIMD
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tristate
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select CRYPTO_CRYPTD
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config CRYPTO_GLUE_HELPER_X86
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tristate
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depends on X86
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@ -142,3 +142,5 @@ obj-$(CONFIG_ASYNC_CORE) += async_tx/
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obj-$(CONFIG_ASYMMETRIC_KEY_TYPE) += asymmetric_keys/
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obj-$(CONFIG_CRYPTO_HASH_INFO) += hash_info.o
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obj-$(CONFIG_CRYPTO_ABLK_HELPER) += ablk_helper.o
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crypto_simd-y := simd.o
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obj-$(CONFIG_CRYPTO_SIMD) += crypto_simd.o
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226
crypto/simd.c
Normal file
226
crypto/simd.c
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@ -0,0 +1,226 @@
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/*
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* Shared crypto simd helpers
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*
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* Copyright (c) 2012 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
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* Copyright (c) 2016 Herbert Xu <herbert@gondor.apana.org.au>
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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 <crypto/cryptd.h>
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#include <crypto/internal/simd.h>
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#include <crypto/internal/skcipher.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/preempt.h>
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#include <asm/simd.h>
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struct simd_skcipher_alg {
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const char *ialg_name;
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struct skcipher_alg alg;
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};
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struct simd_skcipher_ctx {
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struct cryptd_skcipher *cryptd_tfm;
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};
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static int simd_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key,
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unsigned int key_len)
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{
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struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct crypto_skcipher *child = &ctx->cryptd_tfm->base;
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int err;
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crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
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crypto_skcipher_set_flags(child, crypto_skcipher_get_flags(tfm) &
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CRYPTO_TFM_REQ_MASK);
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err = crypto_skcipher_setkey(child, key, key_len);
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crypto_skcipher_set_flags(tfm, crypto_skcipher_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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static int simd_skcipher_encrypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_request *subreq;
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struct crypto_skcipher *child;
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subreq = skcipher_request_ctx(req);
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*subreq = *req;
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if (!may_use_simd() ||
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(in_atomic() && cryptd_skcipher_queued(ctx->cryptd_tfm)))
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child = &ctx->cryptd_tfm->base;
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else
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child = cryptd_skcipher_child(ctx->cryptd_tfm);
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skcipher_request_set_tfm(subreq, child);
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return crypto_skcipher_encrypt(subreq);
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}
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static int simd_skcipher_decrypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_request *subreq;
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struct crypto_skcipher *child;
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subreq = skcipher_request_ctx(req);
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*subreq = *req;
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if (!may_use_simd() ||
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(in_atomic() && cryptd_skcipher_queued(ctx->cryptd_tfm)))
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child = &ctx->cryptd_tfm->base;
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else
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child = cryptd_skcipher_child(ctx->cryptd_tfm);
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skcipher_request_set_tfm(subreq, child);
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return crypto_skcipher_decrypt(subreq);
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}
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static void simd_skcipher_exit(struct crypto_skcipher *tfm)
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{
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struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
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cryptd_free_skcipher(ctx->cryptd_tfm);
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}
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static int simd_skcipher_init(struct crypto_skcipher *tfm)
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{
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struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct cryptd_skcipher *cryptd_tfm;
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struct simd_skcipher_alg *salg;
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struct skcipher_alg *alg;
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unsigned reqsize;
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alg = crypto_skcipher_alg(tfm);
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salg = container_of(alg, struct simd_skcipher_alg, alg);
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cryptd_tfm = cryptd_alloc_skcipher(salg->ialg_name,
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CRYPTO_ALG_INTERNAL,
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CRYPTO_ALG_INTERNAL);
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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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reqsize = sizeof(struct skcipher_request);
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reqsize += crypto_skcipher_reqsize(&cryptd_tfm->base);
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crypto_skcipher_set_reqsize(tfm, reqsize);
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return 0;
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}
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struct simd_skcipher_alg *simd_skcipher_create_compat(const char *algname,
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const char *drvname,
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const char *basename)
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{
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struct simd_skcipher_alg *salg;
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struct crypto_skcipher *tfm;
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struct skcipher_alg *ialg;
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struct skcipher_alg *alg;
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int err;
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tfm = crypto_alloc_skcipher(basename, CRYPTO_ALG_INTERNAL,
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CRYPTO_ALG_INTERNAL | CRYPTO_ALG_ASYNC);
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if (IS_ERR(tfm))
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return ERR_CAST(tfm);
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ialg = crypto_skcipher_alg(tfm);
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salg = kzalloc(sizeof(*salg), GFP_KERNEL);
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if (!salg) {
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salg = ERR_PTR(-ENOMEM);
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goto out_put_tfm;
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}
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salg->ialg_name = basename;
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alg = &salg->alg;
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err = -ENAMETOOLONG;
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if (snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", algname) >=
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CRYPTO_MAX_ALG_NAME)
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goto out_free_salg;
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if (snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
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drvname) >= CRYPTO_MAX_ALG_NAME)
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goto out_free_salg;
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alg->base.cra_flags = CRYPTO_ALG_ASYNC;
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alg->base.cra_priority = ialg->base.cra_priority;
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alg->base.cra_blocksize = ialg->base.cra_blocksize;
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alg->base.cra_alignmask = ialg->base.cra_alignmask;
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alg->base.cra_module = ialg->base.cra_module;
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alg->base.cra_ctxsize = sizeof(struct simd_skcipher_ctx);
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alg->ivsize = ialg->ivsize;
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alg->chunksize = ialg->chunksize;
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alg->min_keysize = ialg->min_keysize;
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alg->max_keysize = ialg->max_keysize;
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alg->init = simd_skcipher_init;
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alg->exit = simd_skcipher_exit;
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alg->setkey = simd_skcipher_setkey;
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alg->encrypt = simd_skcipher_encrypt;
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alg->decrypt = simd_skcipher_decrypt;
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err = crypto_register_skcipher(alg);
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if (err)
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goto out_free_salg;
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out_put_tfm:
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crypto_free_skcipher(tfm);
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return salg;
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out_free_salg:
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kfree(salg);
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salg = ERR_PTR(err);
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goto out_put_tfm;
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}
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EXPORT_SYMBOL_GPL(simd_skcipher_create_compat);
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struct simd_skcipher_alg *simd_skcipher_create(const char *algname,
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const char *basename)
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{
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char drvname[CRYPTO_MAX_ALG_NAME];
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if (snprintf(drvname, CRYPTO_MAX_ALG_NAME, "simd-%s", basename) >=
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CRYPTO_MAX_ALG_NAME)
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return ERR_PTR(-ENAMETOOLONG);
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return simd_skcipher_create_compat(algname, drvname, basename);
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}
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EXPORT_SYMBOL_GPL(simd_skcipher_create);
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void simd_skcipher_free(struct simd_skcipher_alg *salg)
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{
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crypto_unregister_skcipher(&salg->alg);
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kfree(salg);
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}
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EXPORT_SYMBOL_GPL(simd_skcipher_free);
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MODULE_LICENSE("GPL");
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17
include/crypto/internal/simd.h
Normal file
17
include/crypto/internal/simd.h
Normal file
@ -0,0 +1,17 @@
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/*
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* Shared crypto simd helpers
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*/
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#ifndef _CRYPTO_INTERNAL_SIMD_H
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#define _CRYPTO_INTERNAL_SIMD_H
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struct simd_skcipher_alg;
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struct simd_skcipher_alg *simd_skcipher_create_compat(const char *algname,
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const char *drvname,
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const char *basename);
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struct simd_skcipher_alg *simd_skcipher_create(const char *algname,
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const char *basename);
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void simd_skcipher_free(struct simd_skcipher_alg *alg);
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#endif /* _CRYPTO_INTERNAL_SIMD_H */
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