[mirror_ubuntu-artful-kernel.git] / crypto / lzo.c

/*
 * Cryptographic API.
 *
 * 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/lzo.h>

struct lzo_ctx {
	void *lzo_comp_mem;
};

static int lzo_init(struct crypto_tfm *tfm)
{
	struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);

	ctx->lzo_comp_mem = vmalloc(LZO1X_MEM_COMPRESS);
	if (!ctx->lzo_comp_mem)
		return -ENOMEM;

	return 0;
}

static void lzo_exit(struct crypto_tfm *tfm)
{
	struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);

	vfree(ctx->lzo_comp_mem);
}

static int lzo_compress(struct crypto_tfm *tfm, const u8 *src,
			    unsigned int slen, u8 *dst, unsigned int *dlen)
{
	struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
	size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
	int err;

	err = lzo1x_1_compress(src, slen, dst, &tmp_len, ctx->lzo_comp_mem);

	if (err != LZO_E_OK)
		return -EINVAL;

	*dlen = tmp_len;
	return 0;
}

static int lzo_decompress(struct crypto_tfm *tfm, 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 struct crypto_alg alg = {
	.cra_name		= "lzo",
	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
	.cra_ctxsize		= sizeof(struct lzo_ctx),
	.cra_module		= THIS_MODULE,
	.cra_init		= lzo_init,
	.cra_exit		= lzo_exit,
	.cra_u			= { .compress = {
	.coa_compress 		= lzo_compress,
	.coa_decompress  	= lzo_decompress } }
};

static int __init lzo_mod_init(void)
{
	return crypto_register_alg(&alg);
}

static void __exit lzo_mod_fini(void)
{
	crypto_unregister_alg(&alg);
}

module_init(lzo_mod_init);
module_exit(lzo_mod_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("LZO Compression Algorithm");
Commit	Line	Data
0b77abb3 ZS	1	/*
	2	* Cryptographic API.
	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms of the GNU General Public License version 2 as published by
	6	* the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	11	* more details.
	12	*
	13	* You should have received a copy of the GNU General Public License along with
	14	* this program; if not, write to the Free Software Foundation, Inc., 51
	15	* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	16	*
	17	*/
	18
	19	#include <linux/init.h>
	20	#include <linux/module.h>
	21	#include <linux/crypto.h>
	22	#include <linux/vmalloc.h>
	23	#include <linux/lzo.h>
	24
	25	struct lzo_ctx {
	26	void *lzo_comp_mem;
	27	};
	28
	29	static int lzo_init(struct crypto_tfm *tfm)
	30	{
	31	struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
	32
	33	ctx->lzo_comp_mem = vmalloc(LZO1X_MEM_COMPRESS);
	34	if (!ctx->lzo_comp_mem)
	35	return -ENOMEM;
	36
	37	return 0;
	38	}
	39
	40	static void lzo_exit(struct crypto_tfm *tfm)
	41	{
	42	struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
	43
	44	vfree(ctx->lzo_comp_mem);
	45	}
	46
	47	static int lzo_compress(struct crypto_tfm tfm, const u8 src,
	48	unsigned int slen, u8 dst, unsigned int dlen)
	49	{
	50	struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
	51	size_t tmp_len = dlen; / size_t(ulong) <-> uint on 64 bit */
	52	int err;
	53
	54	err = lzo1x_1_compress(src, slen, dst, &tmp_len, ctx->lzo_comp_mem);
	55
	56	if (err != LZO_E_OK)
	57	return -EINVAL;
	58
	59	*dlen = tmp_len;
	60	return 0;
	61	}
	62
	63	static int lzo_decompress(struct crypto_tfm tfm, const u8 src,
	64	unsigned int slen, u8 dst, unsigned int dlen)
65	{
66	int err;
67	size_t tmp_len = dlen; / size_t(ulong) <-> uint on 64 bit */
68
69	err = lzo1x_decompress_safe(src, slen, dst, &tmp_len);
70
71	if (err != LZO_E_OK)
72	return -EINVAL;
73
74	*dlen = tmp_len;
75	return 0;
76
77	}
78
79	static struct crypto_alg alg = {
80	.cra_name = "lzo",
81	.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
82	.cra_ctxsize = sizeof(struct lzo_ctx),
83	.cra_module = THIS_MODULE,
0b77abb3 ZS	84	.cra_init = lzo_init,
	85	.cra_exit = lzo_exit,
	86	.cra_u = { .compress = {
	87	.coa_compress = lzo_compress,
	88	.coa_decompress = lzo_decompress } }
	89	};
	90
3af5b90b	91	static int __init lzo_mod_init(void)
0b77abb3 ZS	92	{
	93	return crypto_register_alg(&alg);
	94	}
	95
3af5b90b	96	static void __exit lzo_mod_fini(void)
0b77abb3 ZS	97	{
	98	crypto_unregister_alg(&alg);
	99	}
	100
3af5b90b KB	101	module_init(lzo_mod_init);
3af5b90b KB	102	module_exit(lzo_mod_fini);
0b77abb3 ZS	103
	104	MODULE_LICENSE("GPL");
	105	MODULE_DESCRIPTION("LZO Compression Algorithm");