[mirror_ubuntu-artful-kernel.git] / crypto / lz4hc.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 lz4hc_ctx {
	void *lz4hc_comp_mem;
};

static void *lz4hc_alloc_ctx(struct crypto_scomp *tfm)
{
	void *ctx;

	ctx = vmalloc(LZ4HC_MEM_COMPRESS);
	if (!ctx)
		return ERR_PTR(-ENOMEM);

	return ctx;
}

static int lz4hc_init(struct crypto_tfm *tfm)
{
	struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);

	ctx->lz4hc_comp_mem = lz4hc_alloc_ctx(NULL);
	if (IS_ERR(ctx->lz4hc_comp_mem))
		return -ENOMEM;

	return 0;
}

static void lz4hc_free_ctx(struct crypto_scomp *tfm, void *ctx)
{
	vfree(ctx);
}

static void lz4hc_exit(struct crypto_tfm *tfm)
{
	struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);

	lz4hc_free_ctx(NULL, ctx->lz4hc_comp_mem);
}

static int __lz4hc_compress_crypto(const u8 *src, unsigned int slen,
				   u8 *dst, unsigned int *dlen, void *ctx)
{
	size_t tmp_len = *dlen;
	int err;

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

	if (err < 0)
		return -EINVAL;

	*dlen = tmp_len;
	return 0;
}

static int lz4hc_scompress(struct crypto_scomp *tfm, const u8 *src,
			   unsigned int slen, u8 *dst, unsigned int *dlen,
			   void *ctx)
{
	return __lz4hc_compress_crypto(src, slen, dst, dlen, ctx);
}

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);

	return __lz4hc_compress_crypto(src, slen, dst, dlen,
					ctx->lz4hc_comp_mem);
}

static int __lz4hc_decompress_crypto(const u8 *src, unsigned int slen,
				     u8 *dst, unsigned int *dlen, void *ctx)
{
	int err;
	size_t tmp_len = *dlen;
	size_t __slen = slen;

	err = lz4_decompress_unknownoutputsize(src, __slen, dst, &tmp_len);
	if (err < 0)
		return -EINVAL;

	*dlen = tmp_len;
	return err;
}

static int lz4hc_sdecompress(struct crypto_scomp *tfm, const u8 *src,
			     unsigned int slen, u8 *dst, unsigned int *dlen,
			     void *ctx)
{
	return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
}

static int lz4hc_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
				   unsigned int slen, u8 *dst,
				   unsigned int *dlen)
{
	return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
}

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 struct scomp_alg scomp = {
	.alloc_ctx		= lz4hc_alloc_ctx,
	.free_ctx		= lz4hc_free_ctx,
	.compress		= lz4hc_scompress,
	.decompress		= lz4hc_sdecompress,
	.base			= {
		.cra_name	= "lz4hc",
		.cra_driver_name = "lz4hc-scomp",
		.cra_module	 = THIS_MODULE,
	}
};

static int __init lz4hc_mod_init(void)
{
	int ret;

	ret = crypto_register_alg(&alg_lz4hc);
	if (ret)
		return ret;

	ret = crypto_register_scomp(&scomp);
	if (ret) {
		crypto_unregister_alg(&alg_lz4hc);
		return ret;
	}

	return ret;
}

static void __exit lz4hc_mod_fini(void)
{
	crypto_unregister_alg(&alg_lz4hc);
	crypto_unregister_scomp(&scomp);
}

module_init(lz4hc_mod_init);
module_exit(lz4hc_mod_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("LZ4HC Compression Algorithm");
MODULE_ALIAS_CRYPTO("lz4hc");
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	#include <linux/init.h>
	21	#include <linux/module.h>
	22	#include <linux/crypto.h>
	23	#include <linux/vmalloc.h>
	24	#include <linux/lz4.h>
91d53d96	25	#include <crypto/internal/scompress.h>
0ea8530d CM	26
	27	struct lz4hc_ctx {
	28	void *lz4hc_comp_mem;
	29	};
	30
91d53d96 GC	31	static void lz4hc_alloc_ctx(struct crypto_scomp tfm)
	32	{
	33	void *ctx;
	34
	35	ctx = vmalloc(LZ4HC_MEM_COMPRESS);
	36	if (!ctx)
	37	return ERR_PTR(-ENOMEM);
	38
	39	return ctx;
	40	}
	41
0ea8530d CM	42	static int lz4hc_init(struct crypto_tfm *tfm)
	43	{
	44	struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
	45
91d53d96 GC	46	ctx->lz4hc_comp_mem = lz4hc_alloc_ctx(NULL);
91d53d96 GC	47	if (IS_ERR(ctx->lz4hc_comp_mem))
0ea8530d CM	48	return -ENOMEM;
	49
	50	return 0;
	51	}
	52
91d53d96 GC	53	static void lz4hc_free_ctx(struct crypto_scomp tfm, void ctx)
	54	{
	55	vfree(ctx);
	56	}
	57
0ea8530d CM	58	static void lz4hc_exit(struct crypto_tfm *tfm)
	59	{
	60	struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
	61
91d53d96	62	lz4hc_free_ctx(NULL, ctx->lz4hc_comp_mem);
0ea8530d CM	63	}
0ea8530d CM	64
91d53d96 GC	65	static int __lz4hc_compress_crypto(const u8 *src, unsigned int slen,
91d53d96 GC	66	u8 dst, unsigned int dlen, void *ctx)
0ea8530d	67	{
0ea8530d CM	68	size_t tmp_len = *dlen;
	69	int err;
	70
91d53d96	71	err = lz4hc_compress(src, slen, dst, &tmp_len, ctx);
0ea8530d CM	72
	73	if (err < 0)
	74	return -EINVAL;
	75
	76	*dlen = tmp_len;
	77	return 0;
	78	}
	79
91d53d96 GC	80	static int lz4hc_scompress(struct crypto_scomp tfm, const u8 src,
	81	unsigned int slen, u8 dst, unsigned int dlen,
	82	void *ctx)
	83	{
	84	return __lz4hc_compress_crypto(src, slen, dst, dlen, ctx);
	85	}
	86
	87	static int lz4hc_compress_crypto(struct crypto_tfm tfm, const u8 src,
	88	unsigned int slen, u8 *dst,
	89	unsigned int *dlen)
	90	{
	91	struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
	92
	93	return __lz4hc_compress_crypto(src, slen, dst, dlen,
	94	ctx->lz4hc_comp_mem);
	95	}
	96
	97	static int __lz4hc_decompress_crypto(const u8 *src, unsigned int slen,
	98	u8 dst, unsigned int dlen, void *ctx)
0ea8530d CM	99	{
	100	int err;
	101	size_t tmp_len = *dlen;
	102	size_t __slen = slen;
	103
d801ab20	104	err = lz4_decompress_unknownoutputsize(src, __slen, dst, &tmp_len);
0ea8530d CM	105	if (err < 0)
	106	return -EINVAL;
	107
	108	*dlen = tmp_len;
	109	return err;
	110	}
	111
91d53d96 GC	112	static int lz4hc_sdecompress(struct crypto_scomp tfm, const u8 src,
	113	unsigned int slen, u8 dst, unsigned int dlen,
	114	void *ctx)
	115	{
	116	return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
	117	}
	118
	119	static int lz4hc_decompress_crypto(struct crypto_tfm tfm, const u8 src,
	120	unsigned int slen, u8 *dst,
	121	unsigned int *dlen)
	122	{
	123	return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
	124	}
	125
0ea8530d CM	126	static struct crypto_alg alg_lz4hc = {
	127	.cra_name = "lz4hc",
	128	.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
	129	.cra_ctxsize = sizeof(struct lz4hc_ctx),
	130	.cra_module = THIS_MODULE,
	131	.cra_list = LIST_HEAD_INIT(alg_lz4hc.cra_list),
	132	.cra_init = lz4hc_init,
	133	.cra_exit = lz4hc_exit,
	134	.cra_u = { .compress = {
	135	.coa_compress = lz4hc_compress_crypto,
	136	.coa_decompress = lz4hc_decompress_crypto } }
	137	};
	138
91d53d96 GC	139	static struct scomp_alg scomp = {
	140	.alloc_ctx = lz4hc_alloc_ctx,
	141	.free_ctx = lz4hc_free_ctx,
	142	.compress = lz4hc_scompress,
	143	.decompress = lz4hc_sdecompress,
	144	.base = {
	145	.cra_name = "lz4hc",
	146	.cra_driver_name = "lz4hc-scomp",
	147	.cra_module = THIS_MODULE,
	148	}
	149	};
	150
0ea8530d CM	151	static int __init lz4hc_mod_init(void)
0ea8530d CM	152	{
91d53d96 GC	153	int ret;
	154
	155	ret = crypto_register_alg(&alg_lz4hc);
	156	if (ret)
	157	return ret;
	158
	159	ret = crypto_register_scomp(&scomp);
	160	if (ret) {
	161	crypto_unregister_alg(&alg_lz4hc);
	162	return ret;
	163	}
	164
	165	return ret;
0ea8530d CM	166	}
	167
	168	static void __exit lz4hc_mod_fini(void)
	169	{
	170	crypto_unregister_alg(&alg_lz4hc);
91d53d96	171	crypto_unregister_scomp(&scomp);
0ea8530d CM	172	}
	173
	174	module_init(lz4hc_mod_init);
	175	module_exit(lz4hc_mod_fini);
	176
	177	MODULE_LICENSE("GPL");
	178	MODULE_DESCRIPTION("LZ4HC Compression Algorithm");
5d26a105	179	MODULE_ALIAS_CRYPTO("lz4hc");