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
20 struct 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 */
44 struct 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
__crypto_scomp_alg(struct crypto_alg * alg)56 static inline struct scomp_alg *__crypto_scomp_alg(struct crypto_alg *alg)
57 {
58 return container_of(alg, struct scomp_alg, base);
59 }
60
__crypto_scomp_tfm(struct crypto_tfm * tfm)61 static inline struct crypto_scomp *__crypto_scomp_tfm(struct crypto_tfm *tfm)
62 {
63 return container_of(tfm, struct crypto_scomp, base);
64 }
65
crypto_scomp_tfm(struct crypto_scomp * tfm)66 static inline struct crypto_tfm *crypto_scomp_tfm(struct crypto_scomp *tfm)
67 {
68 return &tfm->base;
69 }
70
crypto_free_scomp(struct crypto_scomp * tfm)71 static inline void crypto_free_scomp(struct crypto_scomp *tfm)
72 {
73 crypto_destroy_tfm(tfm, crypto_scomp_tfm(tfm));
74 }
75
crypto_scomp_alg(struct crypto_scomp * tfm)76 static 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
crypto_scomp_alloc_ctx(struct crypto_scomp * tfm)81 static inline void *crypto_scomp_alloc_ctx(struct crypto_scomp *tfm)
82 {
83 return crypto_scomp_alg(tfm)->alloc_ctx(tfm);
84 }
85
crypto_scomp_free_ctx(struct crypto_scomp * tfm,void * ctx)86 static 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
crypto_scomp_compress(struct crypto_scomp * tfm,const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen,void * ctx)92 static 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
crypto_scomp_decompress(struct crypto_scomp * tfm,const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen,void * ctx)99 static 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
108 int crypto_init_scomp_ops_async(struct crypto_tfm *tfm);
109 struct acomp_req *crypto_acomp_scomp_alloc_ctx(struct acomp_req *req);
110 void 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 */
122 int 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 */
134 int crypto_unregister_scomp(struct scomp_alg *alg);
135
136 int crypto_register_scomps(struct scomp_alg *algs, int count);
137 void crypto_unregister_scomps(struct scomp_alg *algs, int count);
138
139 #endif
140