[linux.git] / crypto / lz4.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Cryptographic API.
 *
 * Copyright (c) 2013 Chanho Min <[email protected]>
 */

#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 -EINVAL;

	*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_driver_name	= "lz4-generic",
	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
	.cra_ctxsize		= sizeof(struct lz4_ctx),
	.cra_module		= THIS_MODULE,
	.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);
}

subsys_initcall(lz4_mod_init);
module_exit(lz4_mod_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("LZ4 Compression Algorithm");
MODULE_ALIAS_CRYPTO("lz4");
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 <[email protected]>
0ea8530d CM	6	*/
	7
	8	#include <linux/init.h>
	9	#include <linux/module.h>
	10	#include <linux/crypto.h>
	11	#include <linux/vmalloc.h>
	12	#include <linux/lz4.h>
8cd9330e	13	#include <crypto/internal/scompress.h>
0ea8530d CM	14
	15	struct lz4_ctx {
	16	void *lz4_comp_mem;
	17	};
	18
8cd9330e GC	19	static void lz4_alloc_ctx(struct crypto_scomp tfm)
	20	{
	21	void *ctx;
	22
	23	ctx = vmalloc(LZ4_MEM_COMPRESS);
	24	if (!ctx)
	25	return ERR_PTR(-ENOMEM);
	26
	27	return ctx;
	28	}
	29
0ea8530d CM	30	static int lz4_init(struct crypto_tfm *tfm)
	31	{
	32	struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
	33
8cd9330e GC	34	ctx->lz4_comp_mem = lz4_alloc_ctx(NULL);
8cd9330e GC	35	if (IS_ERR(ctx->lz4_comp_mem))
0ea8530d CM	36	return -ENOMEM;
	37
	38	return 0;
	39	}
	40
8cd9330e GC	41	static void lz4_free_ctx(struct crypto_scomp tfm, void ctx)
	42	{
	43	vfree(ctx);
	44	}
	45
0ea8530d CM	46	static void lz4_exit(struct crypto_tfm *tfm)
	47	{
	48	struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
8cd9330e GC	49
8cd9330e GC	50	lz4_free_ctx(NULL, ctx->lz4_comp_mem);
0ea8530d CM	51	}
0ea8530d CM	52
8cd9330e GC	53	static int __lz4_compress_crypto(const u8 *src, unsigned int slen,
8cd9330e GC	54	u8 dst, unsigned int dlen, void *ctx)
0ea8530d	55	{
73a15ac6 SS	56	int out_len = LZ4_compress_default(src, dst,
73a15ac6 SS	57	slen, *dlen, ctx);
0ea8530d	58
73a15ac6	59	if (!out_len)
0ea8530d CM	60	return -EINVAL;
0ea8530d CM	61
73a15ac6	62	*dlen = out_len;
0ea8530d CM	63	return 0;
	64	}
	65
8cd9330e GC	66	static int lz4_scompress(struct crypto_scomp tfm, const u8 src,
	67	unsigned int slen, u8 dst, unsigned int dlen,
	68	void *ctx)
	69	{
	70	return __lz4_compress_crypto(src, slen, dst, dlen, ctx);
	71	}
	72
	73	static int lz4_compress_crypto(struct crypto_tfm tfm, const u8 src,
	74	unsigned int slen, u8 dst, unsigned int dlen)
	75	{
	76	struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
	77
	78	return __lz4_compress_crypto(src, slen, dst, dlen, ctx->lz4_comp_mem);
	79	}
	80
	81	static int __lz4_decompress_crypto(const u8 *src, unsigned int slen,
	82	u8 dst, unsigned int dlen, void *ctx)
0ea8530d	83	{
73a15ac6	84	int out_len = LZ4_decompress_safe(src, dst, slen, *dlen);
0ea8530d	85
73a15ac6	86	if (out_len < 0)
cd15f102	87	return -EINVAL;
0ea8530d	88
73a15ac6 SS	89	*dlen = out_len;
73a15ac6 SS	90	return 0;
0ea8530d CM	91	}
0ea8530d CM	92
8cd9330e GC	93	static int lz4_sdecompress(struct crypto_scomp tfm, const u8 src,
	94	unsigned int slen, u8 dst, unsigned int dlen,
	95	void *ctx)
	96	{
	97	return __lz4_decompress_crypto(src, slen, dst, dlen, NULL);
	98	}
	99
	100	static int lz4_decompress_crypto(struct crypto_tfm tfm, const u8 src,
	101	unsigned int slen, u8 *dst,
	102	unsigned int *dlen)
	103	{
	104	return __lz4_decompress_crypto(src, slen, dst, dlen, NULL);
	105	}
	106
0ea8530d CM	107	static struct crypto_alg alg_lz4 = {
0ea8530d CM	108	.cra_name = "lz4",
d6ebf528	109	.cra_driver_name = "lz4-generic",
0ea8530d CM	110	.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
	111	.cra_ctxsize = sizeof(struct lz4_ctx),
	112	.cra_module = THIS_MODULE,
0ea8530d CM	113	.cra_init = lz4_init,
	114	.cra_exit = lz4_exit,
	115	.cra_u = { .compress = {
	116	.coa_compress = lz4_compress_crypto,
	117	.coa_decompress = lz4_decompress_crypto } }
	118	};
	119
8cd9330e GC	120	static struct scomp_alg scomp = {
	121	.alloc_ctx = lz4_alloc_ctx,
	122	.free_ctx = lz4_free_ctx,
	123	.compress = lz4_scompress,
	124	.decompress = lz4_sdecompress,
	125	.base = {
	126	.cra_name = "lz4",
	127	.cra_driver_name = "lz4-scomp",
	128	.cra_module = THIS_MODULE,
	129	}
	130	};
	131
0ea8530d CM	132	static int __init lz4_mod_init(void)
0ea8530d CM	133	{
8cd9330e GC	134	int ret;
	135
	136	ret = crypto_register_alg(&alg_lz4);
	137	if (ret)
	138	return ret;
	139
	140	ret = crypto_register_scomp(&scomp);
	141	if (ret) {
	142	crypto_unregister_alg(&alg_lz4);
	143	return ret;
	144	}
	145
	146	return ret;
0ea8530d CM	147	}
	148
	149	static void __exit lz4_mod_fini(void)
	150	{
	151	crypto_unregister_alg(&alg_lz4);
8cd9330e	152	crypto_unregister_scomp(&scomp);
0ea8530d CM	153	}
0ea8530d CM	154
c4741b23	155	subsys_initcall(lz4_mod_init);
0ea8530d CM	156	module_exit(lz4_mod_fini);
	157
	158	MODULE_LICENSE("GPL");
	159	MODULE_DESCRIPTION("LZ4 Compression Algorithm");
5d26a105	160	MODULE_ALIAS_CRYPTO("lz4");