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@xxxxxxxxxxxxxxxxxxx> --- crypto/Kconfig | 4 crypto/Makefile | 2 crypto/simd.c | 226 +++++++++++++++++++++++++++++++++++++++++ include/crypto/internal/simd.h | 17 +++ 4 files changed, 249 insertions(+) diff --git a/crypto/Kconfig b/crypto/Kconfig index 1db2a19..3d31181 100644 --- a/crypto/Kconfig +++ b/crypto/Kconfig @@ -246,6 +246,10 @@ config CRYPTO_ABLK_HELPER tristate select CRYPTO_CRYPTD +config CRYPTO_SIMD + tristate + select CRYPTO_CRYPTD + config CRYPTO_GLUE_HELPER_X86 tristate depends on X86 diff --git a/crypto/Makefile b/crypto/Makefile index 82ffeee..a05590e 100644 --- a/crypto/Makefile +++ b/crypto/Makefile @@ -142,3 +142,5 @@ obj-$(CONFIG_ASYNC_CORE) += async_tx/ obj-$(CONFIG_ASYMMETRIC_KEY_TYPE) += asymmetric_keys/ obj-$(CONFIG_CRYPTO_HASH_INFO) += hash_info.o obj-$(CONFIG_CRYPTO_ABLK_HELPER) += ablk_helper.o +crypto_simd-y := simd.o +obj-$(CONFIG_CRYPTO_SIMD) += crypto_simd.o diff --git a/crypto/simd.c b/crypto/simd.c new file mode 100644 index 0000000..2b10cbe --- /dev/null +++ b/crypto/simd.c @@ -0,0 +1,226 @@ +/* + * Shared crypto simd helpers + * + * Copyright (c) 2012 Jussi Kivilinna <jussi.kivilinna@xxxxxxxx> + * Copyright (c) 2016 Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> + * + * Based on aesni-intel_glue.c by: + * Copyright (C) 2008, Intel Corp. + * Author: Huang Ying <ying.huang@xxxxxxxxx> + * + * 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 <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(*alg), 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"); diff --git a/include/crypto/internal/simd.h b/include/crypto/internal/simd.h new file mode 100644 index 0000000..4295099 --- /dev/null +++ b/include/crypto/internal/simd.h @@ -0,0 +1,17 @@ +/* + * Shared crypto simd helpers + */ + +#ifndef _CRYPTO_INTERNAL_SIMD_H +#define _CRYPTO_INTERNAL_SIMD_H + +struct simd_skcipher_alg; + +struct simd_skcipher_alg *simd_skcipher_create_compat(const char *algname, + const char *drvname, + const char *basename); +struct simd_skcipher_alg *simd_skcipher_create(const char *algname, + const char *basename); +void simd_skcipher_free(struct simd_skcipher_alg *alg); + +#endif /* _CRYPTO_INTERNAL_SIMD_H */ -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html