Commit 0ea8530d authored by Chanho Min's avatar Chanho Min Committed by Linus Torvalds
Browse files

crypto: add lz4 Cryptographic API 



Add support for lz4 and lz4hc compression algorithm using the lib/lz4/*
codebase.

[akpm@linux-foundation.org: fix warnings]
Signed-off-by: default avatarChanho Min <chanho.min@lge.com>
Cc: "Darrick J. Wong" <djwong@us.ibm.com>
Cc: Bob Pearson <rpearson@systemfabricworks.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Herbert Xu <herbert@gondor.hengli.com.au>
Cc: Yann Collet <yann.collet.73@gmail.com>
Cc: Kyungsik Lee <kyungsik.lee@lge.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent c72ac7a1

crypto/Kconfig

+16 −0
Original line number Diff line number Diff line
@@ -1336,6 +1336,22 @@ config CRYPTO_842 
	help

	  This is the 842 algorithm.



config CRYPTO_LZ4

	tristate "LZ4 compression algorithm"

	select CRYPTO_ALGAPI

	select LZ4_COMPRESS

	select LZ4_DECOMPRESS

	help

	  This is the LZ4 algorithm.



config CRYPTO_LZ4HC

	tristate "LZ4HC compression algorithm"

	select CRYPTO_ALGAPI

	select LZ4HC_COMPRESS

	select LZ4_DECOMPRESS

	help

	  This is the LZ4 high compression mode algorithm.



comment "Random Number Generation"



config CRYPTO_ANSI_CPRNG

crypto/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -86,6 +86,8 @@ obj-$(CONFIG_CRYPTO_CRC32) += crc32.o 
obj-$(CONFIG_CRYPTO_CRCT10DIF) += crct10dif.o

obj-$(CONFIG_CRYPTO_AUTHENC) += authenc.o authencesn.o

obj-$(CONFIG_CRYPTO_LZO) += lzo.o

obj-$(CONFIG_CRYPTO_LZ4) += lz4.o

obj-$(CONFIG_CRYPTO_LZ4HC) += lz4hc.o

obj-$(CONFIG_CRYPTO_842) += 842.o

obj-$(CONFIG_CRYPTO_RNG2) += rng.o

obj-$(CONFIG_CRYPTO_RNG2) += krng.o

crypto/lz4.c

0 → 100644
+106 −0
Original line number Diff line number Diff line 
/*

 * Cryptographic API.

 *

 * Copyright (c) 2013 Chanho Min <chanho.min@lge.com>

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 as published by

 * the Free Software Foundation.

 *

 * 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., 51

 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

 *

 */



#include <linux/init.h>

#include <linux/module.h>

#include <linux/crypto.h>

#include <linux/vmalloc.h>

#include <linux/lz4.h>



struct lz4_ctx {

	void *lz4_comp_mem;

};



static int lz4_init(struct crypto_tfm *tfm)

{

	struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);



	ctx->lz4_comp_mem = vmalloc(LZ4_MEM_COMPRESS);

	if (!ctx->lz4_comp_mem)

		return -ENOMEM;



	return 0;

}



static void lz4_exit(struct crypto_tfm *tfm)

{

	struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);

	vfree(ctx->lz4_comp_mem);

}



static int lz4_compress_crypto(struct crypto_tfm *tfm, const u8 *src,

			    unsigned int slen, u8 *dst, unsigned int *dlen)

{

	struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);

	size_t tmp_len = *dlen;

	int err;



	err = lz4_compress(src, slen, dst, &tmp_len, ctx->lz4_comp_mem);



	if (err < 0)

		return -EINVAL;



	*dlen = tmp_len;

	return 0;

}



static int lz4_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,

			      unsigned int slen, u8 *dst, unsigned int *dlen)

{

	int err;

	size_t tmp_len = *dlen;

	size_t __slen = slen;



	err = lz4_decompress(src, &__slen, dst, tmp_len);

	if (err < 0)

		return -EINVAL;



	*dlen = tmp_len;

	return err;

}



static struct crypto_alg alg_lz4 = {

	.cra_name		= "lz4",

	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,

	.cra_ctxsize		= sizeof(struct lz4_ctx),

	.cra_module		= THIS_MODULE,

	.cra_list		= LIST_HEAD_INIT(alg_lz4.cra_list),

	.cra_init		= lz4_init,

	.cra_exit		= lz4_exit,

	.cra_u			= { .compress = {

	.coa_compress		= lz4_compress_crypto,

	.coa_decompress		= lz4_decompress_crypto } }

};



static int __init lz4_mod_init(void)

{

	return crypto_register_alg(&alg_lz4);

}



static void __exit lz4_mod_fini(void)

{

	crypto_unregister_alg(&alg_lz4);

}



module_init(lz4_mod_init);

module_exit(lz4_mod_fini);



MODULE_LICENSE("GPL");

MODULE_DESCRIPTION("LZ4 Compression Algorithm");

crypto/lz4hc.c

0 → 100644
+106 −0
Original line number Diff line number Diff line 
/*

 * Cryptographic API.

 *

 * Copyright (c) 2013 Chanho Min <chanho.min@lge.com>

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 as published by

 * the Free Software Foundation.

 *

 * 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., 51

 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

 *

 */

#include <linux/init.h>

#include <linux/module.h>

#include <linux/crypto.h>

#include <linux/vmalloc.h>

#include <linux/lz4.h>



struct lz4hc_ctx {

	void *lz4hc_comp_mem;

};



static int lz4hc_init(struct crypto_tfm *tfm)

{

	struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);



	ctx->lz4hc_comp_mem = vmalloc(LZ4HC_MEM_COMPRESS);

	if (!ctx->lz4hc_comp_mem)

		return -ENOMEM;



	return 0;

}



static void lz4hc_exit(struct crypto_tfm *tfm)

{

	struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);



	vfree(ctx->lz4hc_comp_mem);

}



static int lz4hc_compress_crypto(struct crypto_tfm *tfm, const u8 *src,

			    unsigned int slen, u8 *dst, unsigned int *dlen)

{

	struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);

	size_t tmp_len = *dlen;

	int err;



	err = lz4hc_compress(src, slen, dst, &tmp_len, ctx->lz4hc_comp_mem);



	if (err < 0)

		return -EINVAL;



	*dlen = tmp_len;

	return 0;

}



static int lz4hc_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,

			      unsigned int slen, u8 *dst, unsigned int *dlen)

{

	int err;

	size_t tmp_len = *dlen;

	size_t __slen = slen;



	err = lz4_decompress(src, &__slen, dst, tmp_len);

	if (err < 0)

		return -EINVAL;



	*dlen = tmp_len;

	return err;

}



static struct crypto_alg alg_lz4hc = {

	.cra_name		= "lz4hc",

	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,

	.cra_ctxsize		= sizeof(struct lz4hc_ctx),

	.cra_module		= THIS_MODULE,

	.cra_list		= LIST_HEAD_INIT(alg_lz4hc.cra_list),

	.cra_init		= lz4hc_init,

	.cra_exit		= lz4hc_exit,

	.cra_u			= { .compress = {

	.coa_compress		= lz4hc_compress_crypto,

	.coa_decompress		= lz4hc_decompress_crypto } }

};



static int __init lz4hc_mod_init(void)

{

	return crypto_register_alg(&alg_lz4hc);

}



static void __exit lz4hc_mod_fini(void)

{

	crypto_unregister_alg(&alg_lz4hc);

}



module_init(lz4hc_mod_init);

module_exit(lz4hc_mod_fini);



MODULE_LICENSE("GPL");

MODULE_DESCRIPTION("LZ4HC Compression Algorithm");

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