crypto: create generic version of ablk_helper (a62b01cd) · Commits · e / devices / android_kernel_fairphone_FP4

crypto/Kconfig

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	@@ -179,6 +179,10 @@ config CRYPTO_ABLK_HELPER_X86
	depends on X86		depends on X86
	select CRYPTO_CRYPTD		select CRYPTO_CRYPTD

			config CRYPTO_ABLK_HELPER
			tristate
			select CRYPTO_CRYPTD

	config CRYPTO_GLUE_HELPER_X86		config CRYPTO_GLUE_HELPER_X86
	tristate		tristate
	depends on X86		depends on X86

crypto/Makefile

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	@@ -104,3 +104,4 @@ obj-$(CONFIG_CRYPTO_USER_API_SKCIPHER) += algif_skcipher.o
	obj-$(CONFIG_XOR_BLOCKS) += xor.o		obj-$(CONFIG_XOR_BLOCKS) += xor.o
	obj-$(CONFIG_ASYNC_CORE) += async_tx/		obj-$(CONFIG_ASYNC_CORE) += async_tx/
	obj-$(CONFIG_ASYMMETRIC_KEY_TYPE) += asymmetric_keys/		obj-$(CONFIG_ASYMMETRIC_KEY_TYPE) += asymmetric_keys/
			obj-$(CONFIG_CRYPTO_ABLK_HELPER) += ablk_helper.o

crypto/ablk_helper.c

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			/*
			* 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()) {
			struct ablkcipher_request *cryptd_req =
			ablkcipher_request_ctx(req);

			memcpy(cryptd_req, req, sizeof(*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()) {
			struct ablkcipher_request *cryptd_req =
			ablkcipher_request_ctx(req);

			memcpy(cryptd_req, req, sizeof(*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, 0, 0);
			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");

include/asm-generic/simd.h

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			#include <linux/hardirq.h>

			/*
			* may_use_simd - whether it is allowable at this time to issue SIMD
			* instructions or access the SIMD register file
			*
			* As architectures typically don't preserve the SIMD register file when
			* taking an interrupt, !in_interrupt() should be a reasonable default.
			*/
			static __must_check inline bool may_use_simd(void)
			{
			return !in_interrupt();
			}

include/crypto/ablk_helper.h

0 → 100644

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			/*
			* Shared async block cipher helpers
			*/

			#ifndef _CRYPTO_ABLK_HELPER_H
			#define _CRYPTO_ABLK_HELPER_H

			#include <linux/crypto.h>
			#include <linux/kernel.h>
			#include <crypto/cryptd.h>

			struct async_helper_ctx {
			struct cryptd_ablkcipher *cryptd_tfm;
			};

			extern int ablk_set_key(struct crypto_ablkcipher tfm, const u8 key,
			unsigned int key_len);

			extern int __ablk_encrypt(struct ablkcipher_request *req);

			extern int ablk_encrypt(struct ablkcipher_request *req);

			extern int ablk_decrypt(struct ablkcipher_request *req);

			extern void ablk_exit(struct crypto_tfm *tfm);

			extern int ablk_init_common(struct crypto_tfm tfm, const char drv_name);

			extern int ablk_init(struct crypto_tfm *tfm);

			#endif /* _CRYPTO_ABLK_HELPER_H */