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Linux kernel mirror (for testing)
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kernel
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linux
1/*
2 * Synchronous Compression operations
3 *
4 * Copyright 2015 LG Electronics Inc.
5 * Copyright (c) 2016, Intel Corporation
6 * Author: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the Free
10 * Software Foundation; either version 2 of the License, or (at your option)
11 * any later version.
12 *
13 */
14#ifndef _CRYPTO_SCOMP_INT_H
15#define _CRYPTO_SCOMP_INT_H
16#include <linux/crypto.h>
17
18#define SCOMP_SCRATCH_SIZE 131072
19
20struct crypto_scomp {
21 struct crypto_tfm base;
22};
23
24/**
25 * struct scomp_alg - synchronous compression algorithm
26 *
27 * @alloc_ctx: Function allocates algorithm specific context
28 * @free_ctx: Function frees context allocated with alloc_ctx
29 * @compress: Function performs a compress operation
30 * @decompress: Function performs a de-compress operation
31 * @init: Initialize the cryptographic transformation object.
32 * This function is used to initialize the cryptographic
33 * transformation object. This function is called only once at
34 * the instantiation time, right after the transformation context
35 * was allocated. In case the cryptographic hardware has some
36 * special requirements which need to be handled by software, this
37 * function shall check for the precise requirement of the
38 * transformation and put any software fallbacks in place.
39 * @exit: Deinitialize the cryptographic transformation object. This is a
40 * counterpart to @init, used to remove various changes set in
41 * @init.
42 * @base: Common crypto API algorithm data structure
43 */
44struct scomp_alg {
45 void *(*alloc_ctx)(struct crypto_scomp *tfm);
46 void (*free_ctx)(struct crypto_scomp *tfm, void *ctx);
47 int (*compress)(struct crypto_scomp *tfm, const u8 *src,
48 unsigned int slen, u8 *dst, unsigned int *dlen,
49 void *ctx);
50 int (*decompress)(struct crypto_scomp *tfm, const u8 *src,
51 unsigned int slen, u8 *dst, unsigned int *dlen,
52 void *ctx);
53 struct crypto_alg base;
54};
55
56static inline struct scomp_alg *__crypto_scomp_alg(struct crypto_alg *alg)
57{
58 return container_of(alg, struct scomp_alg, base);
59}
60
61static inline struct crypto_scomp *__crypto_scomp_tfm(struct crypto_tfm *tfm)
62{
63 return container_of(tfm, struct crypto_scomp, base);
64}
65
66static inline struct crypto_tfm *crypto_scomp_tfm(struct crypto_scomp *tfm)
67{
68 return &tfm->base;
69}
70
71static inline void crypto_free_scomp(struct crypto_scomp *tfm)
72{
73 crypto_destroy_tfm(tfm, crypto_scomp_tfm(tfm));
74}
75
76static inline struct scomp_alg *crypto_scomp_alg(struct crypto_scomp *tfm)
77{
78 return __crypto_scomp_alg(crypto_scomp_tfm(tfm)->__crt_alg);
79}
80
81static inline void *crypto_scomp_alloc_ctx(struct crypto_scomp *tfm)
82{
83 return crypto_scomp_alg(tfm)->alloc_ctx(tfm);
84}
85
86static inline void crypto_scomp_free_ctx(struct crypto_scomp *tfm,
87 void *ctx)
88{
89 return crypto_scomp_alg(tfm)->free_ctx(tfm, ctx);
90}
91
92static inline int crypto_scomp_compress(struct crypto_scomp *tfm,
93 const u8 *src, unsigned int slen,
94 u8 *dst, unsigned int *dlen, void *ctx)
95{
96 return crypto_scomp_alg(tfm)->compress(tfm, src, slen, dst, dlen, ctx);
97}
98
99static inline int crypto_scomp_decompress(struct crypto_scomp *tfm,
100 const u8 *src, unsigned int slen,
101 u8 *dst, unsigned int *dlen,
102 void *ctx)
103{
104 return crypto_scomp_alg(tfm)->decompress(tfm, src, slen, dst, dlen,
105 ctx);
106}
107
108int crypto_init_scomp_ops_async(struct crypto_tfm *tfm);
109struct acomp_req *crypto_acomp_scomp_alloc_ctx(struct acomp_req *req);
110void crypto_acomp_scomp_free_ctx(struct acomp_req *req);
111
112/**
113 * crypto_register_scomp() -- Register synchronous compression algorithm
114 *
115 * Function registers an implementation of a synchronous
116 * compression algorithm
117 *
118 * @alg: algorithm definition
119 *
120 * Return: zero on success; error code in case of error
121 */
122int crypto_register_scomp(struct scomp_alg *alg);
123
124/**
125 * crypto_unregister_scomp() -- Unregister synchronous compression algorithm
126 *
127 * Function unregisters an implementation of a synchronous
128 * compression algorithm
129 *
130 * @alg: algorithm definition
131 *
132 * Return: zero on success; error code in case of error
133 */
134int crypto_unregister_scomp(struct scomp_alg *alg);
135
136#endif