[mirror_ubuntu-bionic-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)
{
	int out_len = LZ4_compress_HC(src, dst, slen,
		*dlen, LZ4HC_DEFAULT_CLEVEL, ctx);

	if (!out_len)
		return -EINVAL;

	*dlen = out_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 out_len = LZ4_decompress_safe(src, dst, slen, *dlen);

	if (out_len < 0)
		return -EINVAL;

	*dlen = out_len;
	return 0;
}

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	{
73a15ac6 SS	68	int out_len = LZ4_compress_HC(src, dst, slen,
73a15ac6 SS	69	*dlen, LZ4HC_DEFAULT_CLEVEL, ctx);
0ea8530d	70
73a15ac6	71	if (!out_len)
0ea8530d CM	72	return -EINVAL;
0ea8530d CM	73
73a15ac6	74	*dlen = out_len;
0ea8530d CM	75	return 0;
	76	}
	77
91d53d96 GC	78	static int lz4hc_scompress(struct crypto_scomp tfm, const u8 src,
	79	unsigned int slen, u8 dst, unsigned int dlen,
	80	void *ctx)
	81	{
	82	return __lz4hc_compress_crypto(src, slen, dst, dlen, ctx);
	83	}
	84
	85	static int lz4hc_compress_crypto(struct crypto_tfm tfm, const u8 src,
	86	unsigned int slen, u8 *dst,
	87	unsigned int *dlen)
	88	{
	89	struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
	90
	91	return __lz4hc_compress_crypto(src, slen, dst, dlen,
	92	ctx->lz4hc_comp_mem);
	93	}
	94
	95	static int __lz4hc_decompress_crypto(const u8 *src, unsigned int slen,
	96	u8 dst, unsigned int dlen, void *ctx)
0ea8530d	97	{
73a15ac6	98	int out_len = LZ4_decompress_safe(src, dst, slen, *dlen);
0ea8530d	99
73a15ac6	100	if (out_len < 0)
cd15f102	101	return -EINVAL;
0ea8530d	102
73a15ac6 SS	103	*dlen = out_len;
73a15ac6 SS	104	return 0;
0ea8530d CM	105	}
0ea8530d CM	106
91d53d96 GC	107	static int lz4hc_sdecompress(struct crypto_scomp tfm, const u8 src,
	108	unsigned int slen, u8 dst, unsigned int dlen,
	109	void *ctx)
	110	{
	111	return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
	112	}
	113
	114	static int lz4hc_decompress_crypto(struct crypto_tfm tfm, const u8 src,
	115	unsigned int slen, u8 *dst,
	116	unsigned int *dlen)
	117	{
	118	return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
	119	}
	120
0ea8530d CM	121	static struct crypto_alg alg_lz4hc = {
	122	.cra_name = "lz4hc",
	123	.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
	124	.cra_ctxsize = sizeof(struct lz4hc_ctx),
	125	.cra_module = THIS_MODULE,
	126	.cra_list = LIST_HEAD_INIT(alg_lz4hc.cra_list),
	127	.cra_init = lz4hc_init,
	128	.cra_exit = lz4hc_exit,
	129	.cra_u = { .compress = {
	130	.coa_compress = lz4hc_compress_crypto,
	131	.coa_decompress = lz4hc_decompress_crypto } }
	132	};
	133
91d53d96 GC	134	static struct scomp_alg scomp = {
	135	.alloc_ctx = lz4hc_alloc_ctx,
	136	.free_ctx = lz4hc_free_ctx,
	137	.compress = lz4hc_scompress,
	138	.decompress = lz4hc_sdecompress,
	139	.base = {
	140	.cra_name = "lz4hc",
	141	.cra_driver_name = "lz4hc-scomp",
	142	.cra_module = THIS_MODULE,
	143	}
	144	};
	145
0ea8530d CM	146	static int __init lz4hc_mod_init(void)
0ea8530d CM	147	{
91d53d96 GC	148	int ret;
	149
	150	ret = crypto_register_alg(&alg_lz4hc);
	151	if (ret)
	152	return ret;
	153
	154	ret = crypto_register_scomp(&scomp);
	155	if (ret) {
	156	crypto_unregister_alg(&alg_lz4hc);
	157	return ret;
	158	}
	159
	160	return ret;
0ea8530d CM	161	}
	162
	163	static void __exit lz4hc_mod_fini(void)
	164	{
	165	crypto_unregister_alg(&alg_lz4hc);
91d53d96	166	crypto_unregister_scomp(&scomp);
0ea8530d CM	167	}
	168
	169	module_init(lz4hc_mod_init);
	170	module_exit(lz4hc_mod_fini);
	171
	172	MODULE_LICENSE("GPL");
	173	MODULE_DESCRIPTION("LZ4HC Compression Algorithm");
5d26a105	174	MODULE_ALIAS_CRYPTO("lz4hc");