/* * Shared async block cipher helpers * * Copyright (c) 2012 Jussi Kivilinna <jussi.kivilinna@mbnet.fi> * * 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 <linux/kernel.h> #include <linux/crypto.h> #include <linux/init.h> #include <linux/module.h> #include <linux/hardirq.h> #include <crypto/algapi.h> #include <crypto/cryptd.h> #include <crypto/ablk_helper.h> #include <asm/simd.h> int ablk_set_key(struct crypto_ablkcipher *tfm, const u8 *key, unsigned int key_len) { struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm); struct crypto_ablkcipher *child = &ctx->cryptd_tfm->base; int err; crypto_ablkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK); crypto_ablkcipher_set_flags(child, crypto_ablkcipher_get_flags(tfm) & CRYPTO_TFM_REQ_MASK); err = crypto_ablkcipher_setkey(child, key, key_len); crypto_ablkcipher_set_flags(tfm, crypto_ablkcipher_get_flags(child) & CRYPTO_TFM_RES_MASK); return err; } EXPORT_SYMBOL_GPL(ablk_set_key); int __ablk_encrypt(struct ablkcipher_request *req) { struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req); struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm); struct blkcipher_desc desc; desc.tfm = cryptd_ablkcipher_child(ctx->cryptd_tfm); desc.info = req->info; desc.flags = 0; return crypto_blkcipher_crt(desc.tfm)->encrypt( &desc, req->dst, req->src, req->nbytes); } EXPORT_SYMBOL_GPL(__ablk_encrypt); int ablk_encrypt(struct ablkcipher_request *req) { struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req); struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm); if (!may_use_simd() || (in_atomic() && cryptd_ablkcipher_queued(ctx->cryptd_tfm))) { struct ablkcipher_request *cryptd_req = ablkcipher_request_ctx(req); *cryptd_req = *req; ablkcipher_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base); return crypto_ablkcipher_encrypt(cryptd_req); } else { return __ablk_encrypt(req); } } EXPORT_SYMBOL_GPL(ablk_encrypt); int ablk_decrypt(struct ablkcipher_request *req) { struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req); struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm); if (!may_use_simd() || (in_atomic() && cryptd_ablkcipher_queued(ctx->cryptd_tfm))) { struct ablkcipher_request *cryptd_req = ablkcipher_request_ctx(req); *cryptd_req = *req; ablkcipher_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base); return crypto_ablkcipher_decrypt(cryptd_req); } else { struct blkcipher_desc desc; desc.tfm = cryptd_ablkcipher_child(ctx->cryptd_tfm); desc.info = req->info; desc.flags = 0; return crypto_blkcipher_crt(desc.tfm)->decrypt( &desc, req->dst, req->src, req->nbytes); } } EXPORT_SYMBOL_GPL(ablk_decrypt); void ablk_exit(struct crypto_tfm *tfm) { struct async_helper_ctx *ctx = crypto_tfm_ctx(tfm); cryptd_free_ablkcipher(ctx->cryptd_tfm); } EXPORT_SYMBOL_GPL(ablk_exit); int ablk_init_common(struct crypto_tfm *tfm, const char *drv_name) { struct async_helper_ctx *ctx = crypto_tfm_ctx(tfm); struct cryptd_ablkcipher *cryptd_tfm; cryptd_tfm = cryptd_alloc_ablkcipher(drv_name, CRYPTO_ALG_INTERNAL, CRYPTO_ALG_INTERNAL); if (IS_ERR(cryptd_tfm)) return PTR_ERR(cryptd_tfm); ctx->cryptd_tfm = cryptd_tfm; tfm->crt_ablkcipher.reqsize = sizeof(struct ablkcipher_request) + crypto_ablkcipher_reqsize(&cryptd_tfm->base); return 0; } EXPORT_SYMBOL_GPL(ablk_init_common); int ablk_init(struct crypto_tfm *tfm) { char drv_name[CRYPTO_MAX_ALG_NAME]; snprintf(drv_name, sizeof(drv_name), "__driver-%s", crypto_tfm_alg_driver_name(tfm)); return ablk_init_common(tfm, drv_name); } EXPORT_SYMBOL_GPL(ablk_init); MODULE_LICENSE("GPL");