151 lines
4.3 KiB
C
151 lines
4.3 KiB
C
/*
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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, see <http://www.gnu.org/licenses/>.
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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 <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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(in_atomic() && cryptd_ablkcipher_queued(ctx->cryptd_tfm))) {
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struct ablkcipher_request *cryptd_req =
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ablkcipher_request_ctx(req);
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*cryptd_req = *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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(in_atomic() && cryptd_ablkcipher_queued(ctx->cryptd_tfm))) {
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struct ablkcipher_request *cryptd_req =
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ablkcipher_request_ctx(req);
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*cryptd_req = *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, 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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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");
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