mirror of https://gitee.com/openkylin/linux.git
137 lines
4.1 KiB
C
137 lines
4.1 KiB
C
/*
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* Synchronous Compression operations
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*
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* Copyright 2015 LG Electronics Inc.
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* Copyright (c) 2016, Intel Corporation
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* Author: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#ifndef _CRYPTO_SCOMP_INT_H
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#define _CRYPTO_SCOMP_INT_H
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#include <linux/crypto.h>
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#define SCOMP_SCRATCH_SIZE 131072
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struct crypto_scomp {
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struct crypto_tfm base;
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};
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/**
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* struct scomp_alg - synchronous compression algorithm
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*
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* @alloc_ctx: Function allocates algorithm specific context
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* @free_ctx: Function frees context allocated with alloc_ctx
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* @compress: Function performs a compress operation
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* @decompress: Function performs a de-compress operation
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* @init: Initialize the cryptographic transformation object.
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* This function is used to initialize the cryptographic
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* transformation object. This function is called only once at
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* the instantiation time, right after the transformation context
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* was allocated. In case the cryptographic hardware has some
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* special requirements which need to be handled by software, this
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* function shall check for the precise requirement of the
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* transformation and put any software fallbacks in place.
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* @exit: Deinitialize the cryptographic transformation object. This is a
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* counterpart to @init, used to remove various changes set in
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* @init.
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* @base: Common crypto API algorithm data structure
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*/
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struct scomp_alg {
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void *(*alloc_ctx)(struct crypto_scomp *tfm);
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void (*free_ctx)(struct crypto_scomp *tfm, void *ctx);
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int (*compress)(struct crypto_scomp *tfm, const u8 *src,
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unsigned int slen, u8 *dst, unsigned int *dlen,
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void *ctx);
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int (*decompress)(struct crypto_scomp *tfm, const u8 *src,
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unsigned int slen, u8 *dst, unsigned int *dlen,
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void *ctx);
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struct crypto_alg base;
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};
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static inline struct scomp_alg *__crypto_scomp_alg(struct crypto_alg *alg)
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{
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return container_of(alg, struct scomp_alg, base);
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}
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static inline struct crypto_scomp *__crypto_scomp_tfm(struct crypto_tfm *tfm)
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{
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return container_of(tfm, struct crypto_scomp, base);
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}
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static inline struct crypto_tfm *crypto_scomp_tfm(struct crypto_scomp *tfm)
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{
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return &tfm->base;
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}
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static inline void crypto_free_scomp(struct crypto_scomp *tfm)
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{
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crypto_destroy_tfm(tfm, crypto_scomp_tfm(tfm));
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}
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static inline struct scomp_alg *crypto_scomp_alg(struct crypto_scomp *tfm)
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{
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return __crypto_scomp_alg(crypto_scomp_tfm(tfm)->__crt_alg);
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}
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static inline void *crypto_scomp_alloc_ctx(struct crypto_scomp *tfm)
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{
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return crypto_scomp_alg(tfm)->alloc_ctx(tfm);
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}
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static inline void crypto_scomp_free_ctx(struct crypto_scomp *tfm,
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void *ctx)
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{
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return crypto_scomp_alg(tfm)->free_ctx(tfm, ctx);
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}
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static inline int crypto_scomp_compress(struct crypto_scomp *tfm,
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const u8 *src, unsigned int slen,
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u8 *dst, unsigned int *dlen, void *ctx)
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{
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return crypto_scomp_alg(tfm)->compress(tfm, src, slen, dst, dlen, ctx);
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}
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static inline int crypto_scomp_decompress(struct crypto_scomp *tfm,
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const u8 *src, unsigned int slen,
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u8 *dst, unsigned int *dlen,
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void *ctx)
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{
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return crypto_scomp_alg(tfm)->decompress(tfm, src, slen, dst, dlen,
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ctx);
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}
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int crypto_init_scomp_ops_async(struct crypto_tfm *tfm);
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struct acomp_req *crypto_acomp_scomp_alloc_ctx(struct acomp_req *req);
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void crypto_acomp_scomp_free_ctx(struct acomp_req *req);
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/**
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* crypto_register_scomp() -- Register synchronous compression algorithm
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*
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* Function registers an implementation of a synchronous
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* compression algorithm
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*
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* @alg: algorithm definition
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*
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* Return: zero on success; error code in case of error
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*/
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int crypto_register_scomp(struct scomp_alg *alg);
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/**
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* crypto_unregister_scomp() -- Unregister synchronous compression algorithm
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*
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* Function unregisters an implementation of a synchronous
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* compression algorithm
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*
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* @alg: algorithm definition
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*
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* Return: zero on success; error code in case of error
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*/
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int crypto_unregister_scomp(struct scomp_alg *alg);
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#endif
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