[mirror_ubuntu-artful-kernel.git] / crypto / lz4.c

/*
 * 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>
#include <crypto/internal/scompress.h>

struct lz4_ctx {
	void *lz4_comp_mem;
};

static void *lz4_alloc_ctx(struct crypto_scomp *tfm)
{
	void *ctx;

	ctx = vmalloc(LZ4_MEM_COMPRESS);
	if (!ctx)
		return ERR_PTR(-ENOMEM);

	return ctx;
}

static int lz4_init(struct crypto_tfm *tfm)
{
	struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);

	ctx->lz4_comp_mem = lz4_alloc_ctx(NULL);
	if (IS_ERR(ctx->lz4_comp_mem))
		return -ENOMEM;

	return 0;
}

static void lz4_free_ctx(struct crypto_scomp *tfm, void *ctx)
{
	vfree(ctx);
}

static void lz4_exit(struct crypto_tfm *tfm)
{
	struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);

	lz4_free_ctx(NULL, ctx->lz4_comp_mem);
}

static int __lz4_compress_crypto(const u8 *src, unsigned int slen,
				 u8 *dst, unsigned int *dlen, void *ctx)
{
	int out_len = LZ4_compress_default(src, dst,
		slen, *dlen, ctx);

	if (!out_len)
		return -EINVAL;

	*dlen = out_len;
	return 0;
}

static int lz4_scompress(struct crypto_scomp *tfm, const u8 *src,
			 unsigned int slen, u8 *dst, unsigned int *dlen,
			 void *ctx)
{
	return __lz4_compress_crypto(src, slen, dst, dlen, ctx);
}

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);

	return __lz4_compress_crypto(src, slen, dst, dlen, ctx->lz4_comp_mem);
}

static int __lz4_decompress_crypto(const u8 *src, unsigned int slen,
				   u8 *dst, unsigned int *dlen, void *ctx)
{
	int out_len = LZ4_decompress_safe(src, dst, slen, *dlen);

	if (out_len < 0)
		return out_len;

	*dlen = out_len;
	return 0;
}

static int lz4_sdecompress(struct crypto_scomp *tfm, const u8 *src,
			   unsigned int slen, u8 *dst, unsigned int *dlen,
			   void *ctx)
{
	return __lz4_decompress_crypto(src, slen, dst, dlen, NULL);
}

static int lz4_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
				 unsigned int slen, u8 *dst,
				 unsigned int *dlen)
{
	return __lz4_decompress_crypto(src, slen, dst, dlen, NULL);
}

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 struct scomp_alg scomp = {
	.alloc_ctx		= lz4_alloc_ctx,
	.free_ctx		= lz4_free_ctx,
	.compress		= lz4_scompress,
	.decompress		= lz4_sdecompress,
	.base			= {
		.cra_name	= "lz4",
		.cra_driver_name = "lz4-scomp",
		.cra_module	 = THIS_MODULE,
	}
};

static int __init lz4_mod_init(void)
{
	int ret;

	ret = crypto_register_alg(&alg_lz4);
	if (ret)
		return ret;

	ret = crypto_register_scomp(&scomp);
	if (ret) {
		crypto_unregister_alg(&alg_lz4);
		return ret;
	}

	return ret;
}

static void __exit lz4_mod_fini(void)
{
	crypto_unregister_alg(&alg_lz4);
	crypto_unregister_scomp(&scomp);
}

module_init(lz4_mod_init);
module_exit(lz4_mod_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("LZ4 Compression Algorithm");
MODULE_ALIAS_CRYPTO("lz4");
Commit	Line	Data
0ea8530d CM	1	/*
	2	* Cryptographic API.
	3	*
	4	* Copyright (c) 2013 Chanho Min <chanho.min@lge.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License version 2 as published by
	8	* the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it will be useful, but WITHOUT
	11	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	12	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	13	* more details.
	14	*
	15	* You should have received a copy of the GNU General Public License along with
	16	* this program; if not, write to the Free Software Foundation, Inc., 51
	17	* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	18	*
	19	*/
	20
	21	#include <linux/init.h>
	22	#include <linux/module.h>
	23	#include <linux/crypto.h>
	24	#include <linux/vmalloc.h>
	25	#include <linux/lz4.h>
8cd9330e	26	#include <crypto/internal/scompress.h>
0ea8530d CM	27
	28	struct lz4_ctx {
	29	void *lz4_comp_mem;
	30	};
	31
8cd9330e GC	32	static void lz4_alloc_ctx(struct crypto_scomp tfm)
	33	{
	34	void *ctx;
	35
	36	ctx = vmalloc(LZ4_MEM_COMPRESS);
	37	if (!ctx)
	38	return ERR_PTR(-ENOMEM);
	39
	40	return ctx;
	41	}
	42
0ea8530d CM	43	static int lz4_init(struct crypto_tfm *tfm)
	44	{
	45	struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
	46
8cd9330e GC	47	ctx->lz4_comp_mem = lz4_alloc_ctx(NULL);
8cd9330e GC	48	if (IS_ERR(ctx->lz4_comp_mem))
0ea8530d CM	49	return -ENOMEM;
	50
	51	return 0;
	52	}
	53
8cd9330e GC	54	static void lz4_free_ctx(struct crypto_scomp tfm, void ctx)
	55	{
	56	vfree(ctx);
	57	}
	58
0ea8530d CM	59	static void lz4_exit(struct crypto_tfm *tfm)
	60	{
	61	struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
8cd9330e GC	62
8cd9330e GC	63	lz4_free_ctx(NULL, ctx->lz4_comp_mem);
0ea8530d CM	64	}
0ea8530d CM	65
8cd9330e GC	66	static int __lz4_compress_crypto(const u8 *src, unsigned int slen,
8cd9330e GC	67	u8 dst, unsigned int dlen, void *ctx)
0ea8530d	68	{
73a15ac6 SS	69	int out_len = LZ4_compress_default(src, dst,
73a15ac6 SS	70	slen, *dlen, ctx);
0ea8530d	71
73a15ac6	72	if (!out_len)
0ea8530d CM	73	return -EINVAL;
0ea8530d CM	74
73a15ac6	75	*dlen = out_len;
0ea8530d CM	76	return 0;
	77	}
	78
8cd9330e GC	79	static int lz4_scompress(struct crypto_scomp tfm, const u8 src,
	80	unsigned int slen, u8 dst, unsigned int dlen,
	81	void *ctx)
	82	{
	83	return __lz4_compress_crypto(src, slen, dst, dlen, ctx);
	84	}
	85
	86	static int lz4_compress_crypto(struct crypto_tfm tfm, const u8 src,
	87	unsigned int slen, u8 dst, unsigned int dlen)
	88	{
	89	struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
	90
	91	return __lz4_compress_crypto(src, slen, dst, dlen, ctx->lz4_comp_mem);
	92	}
	93
	94	static int __lz4_decompress_crypto(const u8 *src, unsigned int slen,
	95	u8 dst, unsigned int dlen, void *ctx)
0ea8530d	96	{
73a15ac6	97	int out_len = LZ4_decompress_safe(src, dst, slen, *dlen);
0ea8530d	98
73a15ac6 SS	99	if (out_len < 0)
73a15ac6 SS	100	return out_len;
0ea8530d	101
73a15ac6 SS	102	*dlen = out_len;
73a15ac6 SS	103	return 0;
0ea8530d CM	104	}
0ea8530d CM	105
8cd9330e GC	106	static int lz4_sdecompress(struct crypto_scomp tfm, const u8 src,
	107	unsigned int slen, u8 dst, unsigned int dlen,
	108	void *ctx)
	109	{
	110	return __lz4_decompress_crypto(src, slen, dst, dlen, NULL);
	111	}
	112
	113	static int lz4_decompress_crypto(struct crypto_tfm tfm, const u8 src,
	114	unsigned int slen, u8 *dst,
	115	unsigned int *dlen)
	116	{
	117	return __lz4_decompress_crypto(src, slen, dst, dlen, NULL);
	118	}
	119
0ea8530d CM	120	static struct crypto_alg alg_lz4 = {
	121	.cra_name = "lz4",
	122	.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
	123	.cra_ctxsize = sizeof(struct lz4_ctx),
	124	.cra_module = THIS_MODULE,
	125	.cra_list = LIST_HEAD_INIT(alg_lz4.cra_list),
	126	.cra_init = lz4_init,
	127	.cra_exit = lz4_exit,
	128	.cra_u = { .compress = {
	129	.coa_compress = lz4_compress_crypto,
	130	.coa_decompress = lz4_decompress_crypto } }
	131	};
	132
8cd9330e GC	133	static struct scomp_alg scomp = {
	134	.alloc_ctx = lz4_alloc_ctx,
	135	.free_ctx = lz4_free_ctx,
	136	.compress = lz4_scompress,
	137	.decompress = lz4_sdecompress,
	138	.base = {
	139	.cra_name = "lz4",
	140	.cra_driver_name = "lz4-scomp",
	141	.cra_module = THIS_MODULE,
	142	}
	143	};
	144
0ea8530d CM	145	static int __init lz4_mod_init(void)
0ea8530d CM	146	{
8cd9330e GC	147	int ret;
	148
	149	ret = crypto_register_alg(&alg_lz4);
	150	if (ret)
	151	return ret;
	152
	153	ret = crypto_register_scomp(&scomp);
	154	if (ret) {
	155	crypto_unregister_alg(&alg_lz4);
	156	return ret;
	157	}
	158
	159	return ret;
0ea8530d CM	160	}
	161
	162	static void __exit lz4_mod_fini(void)
	163	{
	164	crypto_unregister_alg(&alg_lz4);
8cd9330e	165	crypto_unregister_scomp(&scomp);
0ea8530d CM	166	}
	167
	168	module_init(lz4_mod_init);
	169	module_exit(lz4_mod_fini);
	170
	171	MODULE_LICENSE("GPL");
	172	MODULE_DESCRIPTION("LZ4 Compression Algorithm");
5d26a105	173	MODULE_ALIAS_CRYPTO("lz4");