/* * 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, 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(*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");