[linux.git] / crypto / lzo-rle.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Cryptographic API.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/crypto.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <linux/lzo.h>
#include <crypto/internal/scompress.h>

struct lzorle_ctx {
	void *lzorle_comp_mem;
};

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

	ctx = kvmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
	if (!ctx)
		return ERR_PTR(-ENOMEM);

	return ctx;
}

static int lzorle_init(struct crypto_tfm *tfm)
{
	struct lzorle_ctx *ctx = crypto_tfm_ctx(tfm);

	ctx->lzorle_comp_mem = lzorle_alloc_ctx(NULL);
	if (IS_ERR(ctx->lzorle_comp_mem))
		return -ENOMEM;

	return 0;
}

static void lzorle_free_ctx(struct crypto_scomp *tfm, void *ctx)
{
	kvfree(ctx);
}

static void lzorle_exit(struct crypto_tfm *tfm)
{
	struct lzorle_ctx *ctx = crypto_tfm_ctx(tfm);

	lzorle_free_ctx(NULL, ctx->lzorle_comp_mem);
}

static int __lzorle_compress(const u8 *src, unsigned int slen,
			  u8 *dst, unsigned int *dlen, void *ctx)
{
	size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
	int err;

	err = lzorle1x_1_compress(src, slen, dst, &tmp_len, ctx);

	if (err != LZO_E_OK)
		return -EINVAL;

	*dlen = tmp_len;
	return 0;
}

static int lzorle_compress(struct crypto_tfm *tfm, const u8 *src,
			unsigned int slen, u8 *dst, unsigned int *dlen)
{
	struct lzorle_ctx *ctx = crypto_tfm_ctx(tfm);

	return __lzorle_compress(src, slen, dst, dlen, ctx->lzorle_comp_mem);
}

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

static int __lzorle_decompress(const u8 *src, unsigned int slen,
			    u8 *dst, unsigned int *dlen)
{
	int err;
	size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */

	err = lzo1x_decompress_safe(src, slen, dst, &tmp_len);

	if (err != LZO_E_OK)
		return -EINVAL;

	*dlen = tmp_len;
	return 0;
}

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

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

static struct crypto_alg alg = {
	.cra_name		= "lzo-rle",
	.cra_driver_name	= "lzo-rle-generic",
	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
	.cra_ctxsize		= sizeof(struct lzorle_ctx),
	.cra_module		= THIS_MODULE,
	.cra_init		= lzorle_init,
	.cra_exit		= lzorle_exit,
	.cra_u			= { .compress = {
	.coa_compress		= lzorle_compress,
	.coa_decompress		= lzorle_decompress } }
};

static struct scomp_alg scomp = {
	.alloc_ctx		= lzorle_alloc_ctx,
	.free_ctx		= lzorle_free_ctx,
	.compress		= lzorle_scompress,
	.decompress		= lzorle_sdecompress,
	.base			= {
		.cra_name	= "lzo-rle",
		.cra_driver_name = "lzo-rle-scomp",
		.cra_module	 = THIS_MODULE,
	}
};

static int __init lzorle_mod_init(void)
{
	int ret;

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

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

	return ret;
}

static void __exit lzorle_mod_fini(void)
{
	crypto_unregister_alg(&alg);
	crypto_unregister_scomp(&scomp);
}

subsys_initcall(lzorle_mod_init);
module_exit(lzorle_mod_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("LZO-RLE Compression Algorithm");
MODULE_ALIAS_CRYPTO("lzo-rle");
Commit	Line	Data
2b27bdcc	1	// SPDX-License-Identifier: GPL-2.0-only
45ec975e DR	2	/*
45ec975e DR	3	* Cryptographic API.
45ec975e DR	4	*/
	5
	6	#include <linux/init.h>
	7	#include <linux/module.h>
	8	#include <linux/crypto.h>
	9	#include <linux/vmalloc.h>
	10	#include <linux/mm.h>
	11	#include <linux/lzo.h>
	12	#include <crypto/internal/scompress.h>
	13
	14	struct lzorle_ctx {
	15	void *lzorle_comp_mem;
	16	};
	17
	18	static void lzorle_alloc_ctx(struct crypto_scomp tfm)
	19	{
	20	void *ctx;
	21
	22	ctx = kvmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
	23	if (!ctx)
	24	return ERR_PTR(-ENOMEM);
	25
	26	return ctx;
	27	}
	28
	29	static int lzorle_init(struct crypto_tfm *tfm)
	30	{
	31	struct lzorle_ctx *ctx = crypto_tfm_ctx(tfm);
	32
	33	ctx->lzorle_comp_mem = lzorle_alloc_ctx(NULL);
	34	if (IS_ERR(ctx->lzorle_comp_mem))
	35	return -ENOMEM;
	36
	37	return 0;
	38	}
	39
	40	static void lzorle_free_ctx(struct crypto_scomp tfm, void ctx)
	41	{
	42	kvfree(ctx);
	43	}
	44
	45	static void lzorle_exit(struct crypto_tfm *tfm)
	46	{
	47	struct lzorle_ctx *ctx = crypto_tfm_ctx(tfm);
	48
	49	lzorle_free_ctx(NULL, ctx->lzorle_comp_mem);
	50	}
	51
	52	static int __lzorle_compress(const u8 *src, unsigned int slen,
	53	u8 dst, unsigned int dlen, void *ctx)
	54	{
	55	size_t tmp_len = dlen; / size_t(ulong) <-> uint on 64 bit */
	56	int err;
	57
	58	err = lzorle1x_1_compress(src, slen, dst, &tmp_len, ctx);
	59
	60	if (err != LZO_E_OK)
	61	return -EINVAL;
	62
	63	*dlen = tmp_len;
	64	return 0;
	65	}
	66
	67	static int lzorle_compress(struct crypto_tfm tfm, const u8 src,
68	unsigned int slen, u8 dst, unsigned int dlen)
69	{
70	struct lzorle_ctx *ctx = crypto_tfm_ctx(tfm);
71
72	return __lzorle_compress(src, slen, dst, dlen, ctx->lzorle_comp_mem);
73	}
74
75	static int lzorle_scompress(struct crypto_scomp tfm, const u8 src,
76	unsigned int slen, u8 dst, unsigned int dlen,
77	void *ctx)
78	{
79	return __lzorle_compress(src, slen, dst, dlen, ctx);
80	}
81
82	static int __lzorle_decompress(const u8 *src, unsigned int slen,
83	u8 dst, unsigned int dlen)
84	{
85	int err;
86	size_t tmp_len = dlen; / size_t(ulong) <-> uint on 64 bit */
87
88	err = lzo1x_decompress_safe(src, slen, dst, &tmp_len);
89
90	if (err != LZO_E_OK)
91	return -EINVAL;
92
93	*dlen = tmp_len;
94	return 0;
95	}
96
97	static int lzorle_decompress(struct crypto_tfm tfm, const u8 src,
98	unsigned int slen, u8 dst, unsigned int dlen)
99	{
100	return __lzorle_decompress(src, slen, dst, dlen);
101	}
102
103	static int lzorle_sdecompress(struct crypto_scomp tfm, const u8 src,
104	unsigned int slen, u8 dst, unsigned int dlen,
105	void *ctx)
106	{
107	return __lzorle_decompress(src, slen, dst, dlen);
108	}
109
110	static struct crypto_alg alg = {
111	.cra_name = "lzo-rle",
d6ebf528	112	.cra_driver_name = "lzo-rle-generic",
45ec975e DR	113	.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
	114	.cra_ctxsize = sizeof(struct lzorle_ctx),
	115	.cra_module = THIS_MODULE,
	116	.cra_init = lzorle_init,
	117	.cra_exit = lzorle_exit,
	118	.cra_u = { .compress = {
	119	.coa_compress = lzorle_compress,
	120	.coa_decompress = lzorle_decompress } }
	121	};
	122
	123	static struct scomp_alg scomp = {
	124	.alloc_ctx = lzorle_alloc_ctx,
	125	.free_ctx = lzorle_free_ctx,
	126	.compress = lzorle_scompress,
	127	.decompress = lzorle_sdecompress,
	128	.base = {
	129	.cra_name = "lzo-rle",
	130	.cra_driver_name = "lzo-rle-scomp",
	131	.cra_module = THIS_MODULE,
	132	}
	133	};
	134
	135	static int __init lzorle_mod_init(void)
	136	{
	137	int ret;
	138
	139	ret = crypto_register_alg(&alg);
	140	if (ret)
	141	return ret;
	142
	143	ret = crypto_register_scomp(&scomp);
	144	if (ret) {
	145	crypto_unregister_alg(&alg);
	146	return ret;
	147	}
	148
	149	return ret;
	150	}
	151
	152	static void __exit lzorle_mod_fini(void)
	153	{
	154	crypto_unregister_alg(&alg);
	155	crypto_unregister_scomp(&scomp);
	156	}
	157
c4741b23	158	subsys_initcall(lzorle_mod_init);
45ec975e DR	159	module_exit(lzorle_mod_fini);
	160
	161	MODULE_LICENSE("GPL");
	162	MODULE_DESCRIPTION("LZO-RLE Compression Algorithm");
	163	MODULE_ALIAS_CRYPTO("lzo-rle");