[mirror_ubuntu-zesty-kernel.git] / crypto / 842.c

/*
 * Cryptographic API for the 842 software compression algorithm.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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.
 *
 * Copyright (C) IBM Corporation, 2011-2015
 *
 * Original Authors: Robert Jennings <rcj@linux.vnet.ibm.com>
 *                   Seth Jennings <sjenning@linux.vnet.ibm.com>
 *
 * Rewrite: Dan Streetman <ddstreet@ieee.org>
 *
 * This is the software implementation of compression and decompression using
 * the 842 format.  This uses the software 842 library at lib/842/ which is
 * only a reference implementation, and is very, very slow as compared to other
 * software compressors.  You probably do not want to use this software
 * compression.  If you have access to the PowerPC 842 compression hardware, you
 * want to use the 842 hardware compression interface, which is at:
 * drivers/crypto/nx/nx-842-crypto.c
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/crypto.h>
#include <linux/sw842.h>
#include <crypto/internal/scompress.h>

struct crypto842_ctx {
	void *wmem;	/* working memory for compress */
};

static void *crypto842_alloc_ctx(struct crypto_scomp *tfm)
{
	void *ctx;

	ctx = kmalloc(SW842_MEM_COMPRESS, GFP_KERNEL);
	if (!ctx)
		return ERR_PTR(-ENOMEM);

	return ctx;
}

static int crypto842_init(struct crypto_tfm *tfm)
{
	struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm);

	ctx->wmem = crypto842_alloc_ctx(NULL);
	if (IS_ERR(ctx->wmem))
		return -ENOMEM;

	return 0;
}

static void crypto842_free_ctx(struct crypto_scomp *tfm, void *ctx)
{
	kfree(ctx);
}

static void crypto842_exit(struct crypto_tfm *tfm)
{
	struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm);

	crypto842_free_ctx(NULL, ctx->wmem);
}

static int crypto842_compress(struct crypto_tfm *tfm,
			      const u8 *src, unsigned int slen,
			      u8 *dst, unsigned int *dlen)
{
	struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm);

	return sw842_compress(src, slen, dst, dlen, ctx->wmem);
}

static int crypto842_scompress(struct crypto_scomp *tfm,
			       const u8 *src, unsigned int slen,
			       u8 *dst, unsigned int *dlen, void *ctx)
{
	return sw842_compress(src, slen, dst, dlen, ctx);
}

static int crypto842_decompress(struct crypto_tfm *tfm,
				const u8 *src, unsigned int slen,
				u8 *dst, unsigned int *dlen)
{
	return sw842_decompress(src, slen, dst, dlen);
}

static int crypto842_sdecompress(struct crypto_scomp *tfm,
				 const u8 *src, unsigned int slen,
				 u8 *dst, unsigned int *dlen, void *ctx)
{
	return sw842_decompress(src, slen, dst, dlen);
}

static struct crypto_alg alg = {
	.cra_name		= "842",
	.cra_driver_name	= "842-generic",
	.cra_priority		= 100,
	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
	.cra_ctxsize		= sizeof(struct crypto842_ctx),
	.cra_module		= THIS_MODULE,
	.cra_init		= crypto842_init,
	.cra_exit		= crypto842_exit,
	.cra_u			= { .compress = {
	.coa_compress		= crypto842_compress,
	.coa_decompress		= crypto842_decompress } }
};

static struct scomp_alg scomp = {
	.alloc_ctx		= crypto842_alloc_ctx,
	.free_ctx		= crypto842_free_ctx,
	.compress		= crypto842_scompress,
	.decompress		= crypto842_sdecompress,
	.base			= {
		.cra_name	= "842",
		.cra_driver_name = "842-scomp",
		.cra_priority	 = 100,
		.cra_module	 = THIS_MODULE,
	}
};

static int __init crypto842_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;
}
module_init(crypto842_mod_init);

static void __exit crypto842_mod_exit(void)
{
	crypto_unregister_alg(&alg);
	crypto_unregister_scomp(&scomp);
}
module_exit(crypto842_mod_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("842 Software Compression Algorithm");
MODULE_ALIAS_CRYPTO("842");
MODULE_ALIAS_CRYPTO("842-generic");
MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.org>");
Commit	Line	Data
	1	/*
	2	* Cryptographic API for the 842 software compression algorithm.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation; either version 2 of the License, or
	7	* (at your option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* Copyright (C) IBM Corporation, 2011-2015
	15	*
	16	* Original Authors: Robert Jennings <rcj@linux.vnet.ibm.com>
	17	* Seth Jennings <sjenning@linux.vnet.ibm.com>
	18	*
	19	* Rewrite: Dan Streetman <ddstreet@ieee.org>
	20	*
	21	* This is the software implementation of compression and decompression using
	22	* the 842 format. This uses the software 842 library at lib/842/ which is
	23	* only a reference implementation, and is very, very slow as compared to other
	24	* software compressors. You probably do not want to use this software
	25	* compression. If you have access to the PowerPC 842 compression hardware, you
	26	* want to use the 842 hardware compression interface, which is at:
	27	* drivers/crypto/nx/nx-842-crypto.c
	28	*/
	29
	30	#include <linux/init.h>
	31	#include <linux/module.h>
	32	#include <linux/crypto.h>
	33	#include <linux/sw842.h>
	34	#include <crypto/internal/scompress.h>
	35
	36	struct crypto842_ctx {
	37	void wmem; / working memory for compress */
	38	};
	39
	40	static void crypto842_alloc_ctx(struct crypto_scomp tfm)
	41	{
	42	void *ctx;
	43
	44	ctx = kmalloc(SW842_MEM_COMPRESS, GFP_KERNEL);
	45	if (!ctx)
	46	return ERR_PTR(-ENOMEM);
	47
	48	return ctx;
	49	}
	50
	51	static int crypto842_init(struct crypto_tfm *tfm)
	52	{
	53	struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm);
	54
	55	ctx->wmem = crypto842_alloc_ctx(NULL);
	56	if (IS_ERR(ctx->wmem))
	57	return -ENOMEM;
	58
	59	return 0;
	60	}
	61
	62	static void crypto842_free_ctx(struct crypto_scomp tfm, void ctx)
	63	{
	64	kfree(ctx);
	65	}
	66
	67	static void crypto842_exit(struct crypto_tfm *tfm)
	68	{
	69	struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm);
	70
	71	crypto842_free_ctx(NULL, ctx->wmem);
	72	}
	73
	74	static int crypto842_compress(struct crypto_tfm *tfm,
	75	const u8 *src, unsigned int slen,
	76	u8 dst, unsigned int dlen)
	77	{
	78	struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm);
	79
	80	return sw842_compress(src, slen, dst, dlen, ctx->wmem);
	81	}
	82
	83	static int crypto842_scompress(struct crypto_scomp *tfm,
	84	const u8 *src, unsigned int slen,
	85	u8 dst, unsigned int dlen, void *ctx)
	86	{
	87	return sw842_compress(src, slen, dst, dlen, ctx);
	88	}
	89
	90	static int crypto842_decompress(struct crypto_tfm *tfm,
	91	const u8 *src, unsigned int slen,
	92	u8 dst, unsigned int dlen)
	93	{
	94	return sw842_decompress(src, slen, dst, dlen);
	95	}
	96
	97	static int crypto842_sdecompress(struct crypto_scomp *tfm,
	98	const u8 *src, unsigned int slen,
	99	u8 dst, unsigned int dlen, void *ctx)
	100	{
	101	return sw842_decompress(src, slen, dst, dlen);
	102	}
	103
	104	static struct crypto_alg alg = {
	105	.cra_name = "842",
	106	.cra_driver_name = "842-generic",
	107	.cra_priority = 100,
	108	.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
	109	.cra_ctxsize = sizeof(struct crypto842_ctx),
	110	.cra_module = THIS_MODULE,
	111	.cra_init = crypto842_init,
	112	.cra_exit = crypto842_exit,
	113	.cra_u = { .compress = {
	114	.coa_compress = crypto842_compress,
	115	.coa_decompress = crypto842_decompress } }
	116	};
	117
	118	static struct scomp_alg scomp = {
	119	.alloc_ctx = crypto842_alloc_ctx,
	120	.free_ctx = crypto842_free_ctx,
	121	.compress = crypto842_scompress,
	122	.decompress = crypto842_sdecompress,
	123	.base = {
	124	.cra_name = "842",
	125	.cra_driver_name = "842-scomp",
	126	.cra_priority = 100,
	127	.cra_module = THIS_MODULE,
	128	}
	129	};
	130
	131	static int __init crypto842_mod_init(void)
	132	{
	133	int ret;
	134
	135	ret = crypto_register_alg(&alg);
	136	if (ret)
	137	return ret;
	138
	139	ret = crypto_register_scomp(&scomp);
	140	if (ret) {
	141	crypto_unregister_alg(&alg);
	142	return ret;
	143	}
	144
	145	return ret;
	146	}
	147	module_init(crypto842_mod_init);
	148
	149	static void __exit crypto842_mod_exit(void)
	150	{
	151	crypto_unregister_alg(&alg);
	152	crypto_unregister_scomp(&scomp);
	153	}
	154	module_exit(crypto842_mod_exit);
	155
	156	MODULE_LICENSE("GPL");
	157	MODULE_DESCRIPTION("842 Software Compression Algorithm");
	158	MODULE_ALIAS_CRYPTO("842");
	159	MODULE_ALIAS_CRYPTO("842-generic");
	160	MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.org>");