Commit 6a8de3ae authored by Giovanni Cabiddu's avatar Giovanni Cabiddu Committed by Herbert Xu
Browse files

crypto: acomp - add support for 842 via scomp 



Add scomp backend for 842 compression algorithm.

Signed-off-by: default avatarGiovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 91d53d96

crypto/842.c

+79 −2
Original line number Diff line number Diff line
@@ -31,11 +31,46 @@ 
#include <linux/module.h>

#include <linux/crypto.h>

#include <linux/sw842.h>

#include <crypto/internal/scompress.h>



struct crypto842_ctx {

	char wmem[SW842_MEM_COMPRESS];	/* working memory for compress */

	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)
@@ -45,6 +80,13 @@ static int crypto842_compress(struct crypto_tfm *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)
@@ -52,6 +94,13 @@ static int crypto842_decompress(struct crypto_tfm *tfm, 
	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",
@@ -59,20 +108,48 @@ static struct crypto_alg alg = { 
	.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)

{

	return crypto_register_alg(&alg);

	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);

crypto/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -1598,6 +1598,7 @@ config CRYPTO_LZO 
config CRYPTO_842

	tristate "842 compression algorithm"

	select CRYPTO_ALGAPI

	select CRYPTO_ACOMP2

	select 842_COMPRESS

	select 842_DECOMPRESS

	help