scompress.h
4.24 KB
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/*
* Synchronous Compression operations
*
* Copyright 2015 LG Electronics Inc.
* Copyright (c) 2016, Intel Corporation
* Author: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
*
* 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.
*
*/
#ifndef _CRYPTO_SCOMP_INT_H
#define _CRYPTO_SCOMP_INT_H
#include <linux/crypto.h>
#define SCOMP_SCRATCH_SIZE 131072
struct crypto_scomp {
struct crypto_tfm base;
};
/**
* struct scomp_alg - synchronous compression algorithm
*
* @alloc_ctx: Function allocates algorithm specific context
* @free_ctx: Function frees context allocated with alloc_ctx
* @compress: Function performs a compress operation
* @decompress: Function performs a de-compress operation
* @init: Initialize the cryptographic transformation object.
* This function is used to initialize the cryptographic
* transformation object. This function is called only once at
* the instantiation time, right after the transformation context
* was allocated. In case the cryptographic hardware has some
* special requirements which need to be handled by software, this
* function shall check for the precise requirement of the
* transformation and put any software fallbacks in place.
* @exit: Deinitialize the cryptographic transformation object. This is a
* counterpart to @init, used to remove various changes set in
* @init.
* @base: Common crypto API algorithm data structure
*/
struct scomp_alg {
void *(*alloc_ctx)(struct crypto_scomp *tfm);
void (*free_ctx)(struct crypto_scomp *tfm, void *ctx);
int (*compress)(struct crypto_scomp *tfm, const u8 *src,
unsigned int slen, u8 *dst, unsigned int *dlen,
void *ctx);
int (*decompress)(struct crypto_scomp *tfm, const u8 *src,
unsigned int slen, u8 *dst, unsigned int *dlen,
void *ctx);
struct crypto_alg base;
};
static inline struct scomp_alg *__crypto_scomp_alg(struct crypto_alg *alg)
{
return container_of(alg, struct scomp_alg, base);
}
static inline struct crypto_scomp *__crypto_scomp_tfm(struct crypto_tfm *tfm)
{
return container_of(tfm, struct crypto_scomp, base);
}
static inline struct crypto_tfm *crypto_scomp_tfm(struct crypto_scomp *tfm)
{
return &tfm->base;
}
static inline void crypto_free_scomp(struct crypto_scomp *tfm)
{
crypto_destroy_tfm(tfm, crypto_scomp_tfm(tfm));
}
static inline struct scomp_alg *crypto_scomp_alg(struct crypto_scomp *tfm)
{
return __crypto_scomp_alg(crypto_scomp_tfm(tfm)->__crt_alg);
}
static inline void *crypto_scomp_alloc_ctx(struct crypto_scomp *tfm)
{
return crypto_scomp_alg(tfm)->alloc_ctx(tfm);
}
static inline void crypto_scomp_free_ctx(struct crypto_scomp *tfm,
void *ctx)
{
return crypto_scomp_alg(tfm)->free_ctx(tfm, ctx);
}
static inline int crypto_scomp_compress(struct crypto_scomp *tfm,
const u8 *src, unsigned int slen,
u8 *dst, unsigned int *dlen, void *ctx)
{
return crypto_scomp_alg(tfm)->compress(tfm, src, slen, dst, dlen, ctx);
}
static inline int crypto_scomp_decompress(struct crypto_scomp *tfm,
const u8 *src, unsigned int slen,
u8 *dst, unsigned int *dlen,
void *ctx)
{
return crypto_scomp_alg(tfm)->decompress(tfm, src, slen, dst, dlen,
ctx);
}
int crypto_init_scomp_ops_async(struct crypto_tfm *tfm);
struct acomp_req *crypto_acomp_scomp_alloc_ctx(struct acomp_req *req);
void crypto_acomp_scomp_free_ctx(struct acomp_req *req);
/**
* crypto_register_scomp() -- Register synchronous compression algorithm
*
* Function registers an implementation of a synchronous
* compression algorithm
*
* @alg: algorithm definition
*
* Return: zero on success; error code in case of error
*/
int crypto_register_scomp(struct scomp_alg *alg);
/**
* crypto_unregister_scomp() -- Unregister synchronous compression algorithm
*
* Function unregisters an implementation of a synchronous
* compression algorithm
*
* @alg: algorithm definition
*
* Return: zero on success; error code in case of error
*/
int crypto_unregister_scomp(struct scomp_alg *alg);
int crypto_register_scomps(struct scomp_alg *algs, int count);
void crypto_unregister_scomps(struct scomp_alg *algs, int count);
#endif