[linux-block.git] / crypto / lz4hc.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Cryptographic API.
 *
 * Copyright (c) 2013 Chanho Min <chanho.min@lge.com>
 */
#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_driver_name	= "lz4hc-generic",
	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
	.cra_ctxsize		= sizeof(struct lz4hc_ctx),
	.cra_module		= THIS_MODULE,
	.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);
}

subsys_initcall(lz4hc_mod_init);
module_exit(lz4hc_mod_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("LZ4HC Compression Algorithm");
MODULE_ALIAS_CRYPTO("lz4hc");
Commit	Line	Data
2b27bdcc	1	// SPDX-License-Identifier: GPL-2.0-only
0ea8530d CM	2	/*
	3	* Cryptographic API.
	4	*
	5	* Copyright (c) 2013 Chanho Min <chanho.min@lge.com>
0ea8530d CM	6	*/
	7	#include <linux/init.h>
	8	#include <linux/module.h>
	9	#include <linux/crypto.h>
	10	#include <linux/vmalloc.h>
	11	#include <linux/lz4.h>
91d53d96	12	#include <crypto/internal/scompress.h>
0ea8530d CM	13
	14	struct lz4hc_ctx {
	15	void *lz4hc_comp_mem;
	16	};
	17
91d53d96 GC	18	static void lz4hc_alloc_ctx(struct crypto_scomp tfm)
	19	{
	20	void *ctx;
	21
	22	ctx = vmalloc(LZ4HC_MEM_COMPRESS);
	23	if (!ctx)
	24	return ERR_PTR(-ENOMEM);
	25
	26	return ctx;
	27	}
	28
0ea8530d CM	29	static int lz4hc_init(struct crypto_tfm *tfm)
	30	{
	31	struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
	32
91d53d96 GC	33	ctx->lz4hc_comp_mem = lz4hc_alloc_ctx(NULL);
91d53d96 GC	34	if (IS_ERR(ctx->lz4hc_comp_mem))
0ea8530d CM	35	return -ENOMEM;
	36
	37	return 0;
	38	}
	39
91d53d96 GC	40	static void lz4hc_free_ctx(struct crypto_scomp tfm, void ctx)
	41	{
	42	vfree(ctx);
	43	}
	44
0ea8530d CM	45	static void lz4hc_exit(struct crypto_tfm *tfm)
	46	{
	47	struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
	48
91d53d96	49	lz4hc_free_ctx(NULL, ctx->lz4hc_comp_mem);
0ea8530d CM	50	}
0ea8530d CM	51
91d53d96 GC	52	static int __lz4hc_compress_crypto(const u8 *src, unsigned int slen,
91d53d96 GC	53	u8 dst, unsigned int dlen, void *ctx)
0ea8530d	54	{
73a15ac6 SS	55	int out_len = LZ4_compress_HC(src, dst, slen,
73a15ac6 SS	56	*dlen, LZ4HC_DEFAULT_CLEVEL, ctx);
0ea8530d	57
73a15ac6	58	if (!out_len)
0ea8530d CM	59	return -EINVAL;
0ea8530d CM	60
73a15ac6	61	*dlen = out_len;
0ea8530d CM	62	return 0;
	63	}
	64
91d53d96 GC	65	static int lz4hc_scompress(struct crypto_scomp tfm, const u8 src,
	66	unsigned int slen, u8 dst, unsigned int dlen,
	67	void *ctx)
	68	{
	69	return __lz4hc_compress_crypto(src, slen, dst, dlen, ctx);
	70	}
	71
	72	static int lz4hc_compress_crypto(struct crypto_tfm tfm, const u8 src,
	73	unsigned int slen, u8 *dst,
	74	unsigned int *dlen)
	75	{
	76	struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
	77
	78	return __lz4hc_compress_crypto(src, slen, dst, dlen,
	79	ctx->lz4hc_comp_mem);
	80	}
	81
	82	static int __lz4hc_decompress_crypto(const u8 *src, unsigned int slen,
	83	u8 dst, unsigned int dlen, void *ctx)
0ea8530d	84	{
73a15ac6	85	int out_len = LZ4_decompress_safe(src, dst, slen, *dlen);
0ea8530d	86
73a15ac6	87	if (out_len < 0)
cd15f102	88	return -EINVAL;
0ea8530d	89
73a15ac6 SS	90	*dlen = out_len;
73a15ac6 SS	91	return 0;
0ea8530d CM	92	}
0ea8530d CM	93
91d53d96 GC	94	static int lz4hc_sdecompress(struct crypto_scomp tfm, const u8 src,
	95	unsigned int slen, u8 dst, unsigned int dlen,
	96	void *ctx)
	97	{
	98	return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
	99	}
	100
	101	static int lz4hc_decompress_crypto(struct crypto_tfm tfm, const u8 src,
	102	unsigned int slen, u8 *dst,
	103	unsigned int *dlen)
	104	{
	105	return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
	106	}
	107
0ea8530d CM	108	static struct crypto_alg alg_lz4hc = {
0ea8530d CM	109	.cra_name = "lz4hc",
d6ebf528	110	.cra_driver_name = "lz4hc-generic",
0ea8530d CM	111	.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
	112	.cra_ctxsize = sizeof(struct lz4hc_ctx),
	113	.cra_module = THIS_MODULE,
0ea8530d CM	114	.cra_init = lz4hc_init,
	115	.cra_exit = lz4hc_exit,
	116	.cra_u = { .compress = {
	117	.coa_compress = lz4hc_compress_crypto,
	118	.coa_decompress = lz4hc_decompress_crypto } }
	119	};
	120
91d53d96 GC	121	static struct scomp_alg scomp = {
	122	.alloc_ctx = lz4hc_alloc_ctx,
	123	.free_ctx = lz4hc_free_ctx,
	124	.compress = lz4hc_scompress,
	125	.decompress = lz4hc_sdecompress,
	126	.base = {
	127	.cra_name = "lz4hc",
	128	.cra_driver_name = "lz4hc-scomp",
	129	.cra_module = THIS_MODULE,
	130	}
	131	};
	132
0ea8530d CM	133	static int __init lz4hc_mod_init(void)
0ea8530d CM	134	{
91d53d96 GC	135	int ret;
	136
	137	ret = crypto_register_alg(&alg_lz4hc);
	138	if (ret)
	139	return ret;
	140
	141	ret = crypto_register_scomp(&scomp);
	142	if (ret) {
	143	crypto_unregister_alg(&alg_lz4hc);
	144	return ret;
	145	}
	146
	147	return ret;
0ea8530d CM	148	}
	149
	150	static void __exit lz4hc_mod_fini(void)
	151	{
	152	crypto_unregister_alg(&alg_lz4hc);
91d53d96	153	crypto_unregister_scomp(&scomp);
0ea8530d CM	154	}
0ea8530d CM	155
c4741b23	156	subsys_initcall(lz4hc_mod_init);
0ea8530d CM	157	module_exit(lz4hc_mod_fini);
	158
	159	MODULE_LICENSE("GPL");
	160	MODULE_DESCRIPTION("LZ4HC Compression Algorithm");
5d26a105	161	MODULE_ALIAS_CRYPTO("lz4hc");