[linux-block.git] / crypto / 842.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Cryptographic API for the 842 software compression algorithm.
 *
 * 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;
}
subsys_initcall(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
c942fddf	1	// SPDX-License-Identifier: GPL-2.0-or-later
35a1fc18	2	/*
2062c5b6	3	* Cryptographic API for the 842 software compression algorithm.
35a1fc18	4	*
2062c5b6	5	* Copyright (C) IBM Corporation, 2011-2015
35a1fc18	6	*
2062c5b6 DS	7	* Original Authors: Robert Jennings <rcj@linux.vnet.ibm.com>
2062c5b6 DS	8	* Seth Jennings <sjenning@linux.vnet.ibm.com>
35a1fc18	9	*
2062c5b6 DS	10	* Rewrite: Dan Streetman <ddstreet@ieee.org>
	11	*
	12	* This is the software implementation of compression and decompression using
	13	* the 842 format. This uses the software 842 library at lib/842/ which is
	14	* only a reference implementation, and is very, very slow as compared to other
	15	* software compressors. You probably do not want to use this software
	16	* compression. If you have access to the PowerPC 842 compression hardware, you
	17	* want to use the 842 hardware compression interface, which is at:
	18	* drivers/crypto/nx/nx-842-crypto.c
35a1fc18 SJ	19	*/
	20
	21	#include <linux/init.h>
	22	#include <linux/module.h>
	23	#include <linux/crypto.h>
2062c5b6	24	#include <linux/sw842.h>
6a8de3ae	25	#include <crypto/internal/scompress.h>
35a1fc18	26
2062c5b6	27	struct crypto842_ctx {
6a8de3ae	28	void wmem; / working memory for compress */
35a1fc18 SJ	29	};
35a1fc18 SJ	30
6a8de3ae GC	31	static void crypto842_alloc_ctx(struct crypto_scomp tfm)
	32	{
	33	void *ctx;
	34
	35	ctx = kmalloc(SW842_MEM_COMPRESS, GFP_KERNEL);
	36	if (!ctx)
	37	return ERR_PTR(-ENOMEM);
	38
	39	return ctx;
	40	}
	41
	42	static int crypto842_init(struct crypto_tfm *tfm)
	43	{
	44	struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm);
	45
	46	ctx->wmem = crypto842_alloc_ctx(NULL);
	47	if (IS_ERR(ctx->wmem))
	48	return -ENOMEM;
	49
	50	return 0;
	51	}
	52
	53	static void crypto842_free_ctx(struct crypto_scomp tfm, void ctx)
	54	{
	55	kfree(ctx);
	56	}
	57
	58	static void crypto842_exit(struct crypto_tfm *tfm)
	59	{
	60	struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm);
	61
	62	crypto842_free_ctx(NULL, ctx->wmem);
	63	}
	64
2062c5b6 DS	65	static int crypto842_compress(struct crypto_tfm *tfm,
	66	const u8 *src, unsigned int slen,
	67	u8 dst, unsigned int dlen)
35a1fc18	68	{
2062c5b6	69	struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm);
35a1fc18	70
2062c5b6	71	return sw842_compress(src, slen, dst, dlen, ctx->wmem);
35a1fc18 SJ	72	}
35a1fc18 SJ	73
6a8de3ae GC	74	static int crypto842_scompress(struct crypto_scomp *tfm,
	75	const u8 *src, unsigned int slen,
	76	u8 dst, unsigned int dlen, void *ctx)
	77	{
	78	return sw842_compress(src, slen, dst, dlen, ctx);
	79	}
	80
2062c5b6 DS	81	static int crypto842_decompress(struct crypto_tfm *tfm,
	82	const u8 *src, unsigned int slen,
	83	u8 dst, unsigned int dlen)
35a1fc18	84	{
2062c5b6	85	return sw842_decompress(src, slen, dst, dlen);
35a1fc18 SJ	86	}
35a1fc18 SJ	87
6a8de3ae GC	88	static int crypto842_sdecompress(struct crypto_scomp *tfm,
	89	const u8 *src, unsigned int slen,
	90	u8 dst, unsigned int dlen, void *ctx)
	91	{
	92	return sw842_decompress(src, slen, dst, dlen);
	93	}
	94
35a1fc18 SJ	95	static struct crypto_alg alg = {
35a1fc18 SJ	96	.cra_name = "842",
2062c5b6 DS	97	.cra_driver_name = "842-generic",
2062c5b6 DS	98	.cra_priority = 100,
35a1fc18	99	.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
2062c5b6	100	.cra_ctxsize = sizeof(struct crypto842_ctx),
35a1fc18	101	.cra_module = THIS_MODULE,
6a8de3ae GC	102	.cra_init = crypto842_init,
6a8de3ae GC	103	.cra_exit = crypto842_exit,
35a1fc18	104	.cra_u = { .compress = {
2062c5b6 DS	105	.coa_compress = crypto842_compress,
2062c5b6 DS	106	.coa_decompress = crypto842_decompress } }
35a1fc18 SJ	107	};
35a1fc18 SJ	108
6a8de3ae GC	109	static struct scomp_alg scomp = {
	110	.alloc_ctx = crypto842_alloc_ctx,
	111	.free_ctx = crypto842_free_ctx,
	112	.compress = crypto842_scompress,
	113	.decompress = crypto842_sdecompress,
	114	.base = {
	115	.cra_name = "842",
	116	.cra_driver_name = "842-scomp",
	117	.cra_priority = 100,
	118	.cra_module = THIS_MODULE,
	119	}
	120	};
	121
2062c5b6	122	static int __init crypto842_mod_init(void)
35a1fc18	123	{
6a8de3ae GC	124	int ret;
	125
	126	ret = crypto_register_alg(&alg);
	127	if (ret)
	128	return ret;
	129
	130	ret = crypto_register_scomp(&scomp);
	131	if (ret) {
	132	crypto_unregister_alg(&alg);
	133	return ret;
	134	}
	135
	136	return ret;
35a1fc18	137	}
c4741b23	138	subsys_initcall(crypto842_mod_init);
35a1fc18	139
2062c5b6	140	static void __exit crypto842_mod_exit(void)
35a1fc18 SJ	141	{
35a1fc18 SJ	142	crypto_unregister_alg(&alg);
6a8de3ae	143	crypto_unregister_scomp(&scomp);
35a1fc18	144	}
2062c5b6	145	module_exit(crypto842_mod_exit);
35a1fc18 SJ	146
35a1fc18 SJ	147	MODULE_LICENSE("GPL");
2062c5b6	148	MODULE_DESCRIPTION("842 Software Compression Algorithm");
5d26a105	149	MODULE_ALIAS_CRYPTO("842");
2062c5b6 DS	150	MODULE_ALIAS_CRYPTO("842-generic");
2062c5b6 DS	151	MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.org>");