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Commit 150c7e85 authored by Huang Ying's avatar Huang Ying Committed by Herbert Xu
Browse files

crypto: fpu - Add template for blkcipher touching FPU 



Blkcipher touching FPU need to be enclosed by kernel_fpu_begin() and
kernel_fpu_end(). If they are invoked in cipher algorithm
implementation, they will be invoked for each block, so that
performance will be hurt, because they are "slow" operations. This
patch implements "fpu" template, which makes these operations to be
invoked for each request.

Signed-off-by: default avatarHuang Ying <ying.huang@intel.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 505fd21d

arch/x86/crypto/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -2,6 +2,8 @@ 
# Arch-specific CryptoAPI modules.

#



obj-$(CONFIG_CRYPTO_FPU) += fpu.o



obj-$(CONFIG_CRYPTO_AES_586) += aes-i586.o

obj-$(CONFIG_CRYPTO_TWOFISH_586) += twofish-i586.o

obj-$(CONFIG_CRYPTO_SALSA20_586) += salsa20-i586.o

arch/x86/crypto/fpu.c

0 → 100644
+166 −0
Original line number Diff line number Diff line 
/*

 * FPU: Wrapper for blkcipher touching fpu

 *

 * Copyright (c) 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.

 *

 */



#include <crypto/algapi.h>

#include <linux/err.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <asm/i387.h>



struct crypto_fpu_ctx {

	struct crypto_blkcipher *child;

};



static int crypto_fpu_setkey(struct crypto_tfm *parent, const u8 *key,

			     unsigned int keylen)

{

	struct crypto_fpu_ctx *ctx = crypto_tfm_ctx(parent);

	struct crypto_blkcipher *child = ctx->child;

	int err;



	crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);

	crypto_blkcipher_set_flags(child, crypto_tfm_get_flags(parent) &

				   CRYPTO_TFM_REQ_MASK);

	err = crypto_blkcipher_setkey(child, key, keylen);

	crypto_tfm_set_flags(parent, crypto_blkcipher_get_flags(child) &

				     CRYPTO_TFM_RES_MASK);

	return err;

}



static int crypto_fpu_encrypt(struct blkcipher_desc *desc_in,

			      struct scatterlist *dst, struct scatterlist *src,

			      unsigned int nbytes)

{

	int err;

	struct crypto_fpu_ctx *ctx = crypto_blkcipher_ctx(desc_in->tfm);

	struct crypto_blkcipher *child = ctx->child;

	struct blkcipher_desc desc = {

		.tfm = child,

		.info = desc_in->info,

		.flags = desc_in->flags,

	};



	kernel_fpu_begin();

	err = crypto_blkcipher_crt(desc.tfm)->encrypt(&desc, dst, src, nbytes);

	kernel_fpu_end();

	return err;

}



static int crypto_fpu_decrypt(struct blkcipher_desc *desc_in,

			      struct scatterlist *dst, struct scatterlist *src,

			      unsigned int nbytes)

{

	int err;

	struct crypto_fpu_ctx *ctx = crypto_blkcipher_ctx(desc_in->tfm);

	struct crypto_blkcipher *child = ctx->child;

	struct blkcipher_desc desc = {

		.tfm = child,

		.info = desc_in->info,

		.flags = desc_in->flags,

	};



	kernel_fpu_begin();

	err = crypto_blkcipher_crt(desc.tfm)->decrypt(&desc, dst, src, nbytes);

	kernel_fpu_end();

	return err;

}



static int crypto_fpu_init_tfm(struct crypto_tfm *tfm)

{

	struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);

	struct crypto_spawn *spawn = crypto_instance_ctx(inst);

	struct crypto_fpu_ctx *ctx = crypto_tfm_ctx(tfm);

	struct crypto_blkcipher *cipher;



	cipher = crypto_spawn_blkcipher(spawn);

	if (IS_ERR(cipher))

		return PTR_ERR(cipher);



	ctx->child = cipher;

	return 0;

}



static void crypto_fpu_exit_tfm(struct crypto_tfm *tfm)

{

	struct crypto_fpu_ctx *ctx = crypto_tfm_ctx(tfm);

	crypto_free_blkcipher(ctx->child);

}



static struct crypto_instance *crypto_fpu_alloc(struct rtattr **tb)

{

	struct crypto_instance *inst;

	struct crypto_alg *alg;

	int err;



	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);

	if (err)

		return ERR_PTR(err);



	alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_BLKCIPHER,

				  CRYPTO_ALG_TYPE_MASK);

	if (IS_ERR(alg))

		return ERR_CAST(alg);



	inst = crypto_alloc_instance("fpu", alg);

	if (IS_ERR(inst))

		goto out_put_alg;



	inst->alg.cra_flags = alg->cra_flags;

	inst->alg.cra_priority = alg->cra_priority;

	inst->alg.cra_blocksize = alg->cra_blocksize;

	inst->alg.cra_alignmask = alg->cra_alignmask;

	inst->alg.cra_type = alg->cra_type;

	inst->alg.cra_blkcipher.ivsize = alg->cra_blkcipher.ivsize;

	inst->alg.cra_blkcipher.min_keysize = alg->cra_blkcipher.min_keysize;

	inst->alg.cra_blkcipher.max_keysize = alg->cra_blkcipher.max_keysize;

	inst->alg.cra_ctxsize = sizeof(struct crypto_fpu_ctx);

	inst->alg.cra_init = crypto_fpu_init_tfm;

	inst->alg.cra_exit = crypto_fpu_exit_tfm;

	inst->alg.cra_blkcipher.setkey = crypto_fpu_setkey;

	inst->alg.cra_blkcipher.encrypt = crypto_fpu_encrypt;

	inst->alg.cra_blkcipher.decrypt = crypto_fpu_decrypt;



out_put_alg:

	crypto_mod_put(alg);

	return inst;

}



static void crypto_fpu_free(struct crypto_instance *inst)

{

	crypto_drop_spawn(crypto_instance_ctx(inst));

	kfree(inst);

}



static struct crypto_template crypto_fpu_tmpl = {

	.name = "fpu",

	.alloc = crypto_fpu_alloc,

	.free = crypto_fpu_free,

	.module = THIS_MODULE,

};



static int __init crypto_fpu_module_init(void)

{

	return crypto_register_template(&crypto_fpu_tmpl);

}



static void __exit crypto_fpu_module_exit(void)

{

	crypto_unregister_template(&crypto_fpu_tmpl);

}



module_init(crypto_fpu_module_init);

module_exit(crypto_fpu_module_exit);



MODULE_LICENSE("GPL");

MODULE_DESCRIPTION("FPU block cipher wrapper");

crypto/Kconfig

+5 −0
Original line number Diff line number Diff line
@@ -241,6 +241,11 @@ config CRYPTO_XTS 
	  key size 256, 384 or 512 bits. This implementation currently

	  can't handle a sectorsize which is not a multiple of 16 bytes.



config CRYPTO_FPU

	tristate

	select CRYPTO_BLKCIPHER

	select CRYPTO_MANAGER



comment "Hash modes"



config CRYPTO_HMAC