1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * Synchronous Compression operations
4 *
5 * Copyright 2015 LG Electronics Inc.
6 * Copyright (c) 2016, Intel Corporation
7 * Author: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
8 */
9 #ifndef _CRYPTO_SCOMP_INT_H
10 #define _CRYPTO_SCOMP_INT_H
11 #include <linux/crypto.h>
12
13 #define SCOMP_SCRATCH_SIZE 131072
14
15 struct crypto_scomp {
16 struct crypto_tfm base;
17 };
18
19 /**
20 * struct scomp_alg - synchronous compression algorithm
21 *
22 * @alloc_ctx: Function allocates algorithm specific context
23 * @free_ctx: Function frees context allocated with alloc_ctx
24 * @compress: Function performs a compress operation
25 * @decompress: Function performs a de-compress operation
26 * @base: Common crypto API algorithm data structure
27 */
28 struct scomp_alg {
29 void *(*alloc_ctx)(struct crypto_scomp *tfm);
30 void (*free_ctx)(struct crypto_scomp *tfm, void *ctx);
31 int (*compress)(struct crypto_scomp *tfm, const u8 *src,
32 unsigned int slen, u8 *dst, unsigned int *dlen,
33 void *ctx);
34 int (*decompress)(struct crypto_scomp *tfm, const u8 *src,
35 unsigned int slen, u8 *dst, unsigned int *dlen,
36 void *ctx);
37 struct crypto_alg base;
38 };
39
__crypto_scomp_alg(struct crypto_alg * alg)40 static inline struct scomp_alg *__crypto_scomp_alg(struct crypto_alg *alg)
41 {
42 return container_of(alg, struct scomp_alg, base);
43 }
44
__crypto_scomp_tfm(struct crypto_tfm * tfm)45 static inline struct crypto_scomp *__crypto_scomp_tfm(struct crypto_tfm *tfm)
46 {
47 return container_of(tfm, struct crypto_scomp, base);
48 }
49
crypto_scomp_tfm(struct crypto_scomp * tfm)50 static inline struct crypto_tfm *crypto_scomp_tfm(struct crypto_scomp *tfm)
51 {
52 return &tfm->base;
53 }
54
crypto_free_scomp(struct crypto_scomp * tfm)55 static inline void crypto_free_scomp(struct crypto_scomp *tfm)
56 {
57 crypto_destroy_tfm(tfm, crypto_scomp_tfm(tfm));
58 }
59
crypto_scomp_alg(struct crypto_scomp * tfm)60 static inline struct scomp_alg *crypto_scomp_alg(struct crypto_scomp *tfm)
61 {
62 return __crypto_scomp_alg(crypto_scomp_tfm(tfm)->__crt_alg);
63 }
64
crypto_scomp_alloc_ctx(struct crypto_scomp * tfm)65 static inline void *crypto_scomp_alloc_ctx(struct crypto_scomp *tfm)
66 {
67 return crypto_scomp_alg(tfm)->alloc_ctx(tfm);
68 }
69
crypto_scomp_free_ctx(struct crypto_scomp * tfm,void * ctx)70 static inline void crypto_scomp_free_ctx(struct crypto_scomp *tfm,
71 void *ctx)
72 {
73 return crypto_scomp_alg(tfm)->free_ctx(tfm, ctx);
74 }
75
crypto_scomp_compress(struct crypto_scomp * tfm,const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen,void * ctx)76 static inline int crypto_scomp_compress(struct crypto_scomp *tfm,
77 const u8 *src, unsigned int slen,
78 u8 *dst, unsigned int *dlen, void *ctx)
79 {
80 return crypto_scomp_alg(tfm)->compress(tfm, src, slen, dst, dlen, ctx);
81 }
82
crypto_scomp_decompress(struct crypto_scomp * tfm,const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen,void * ctx)83 static inline int crypto_scomp_decompress(struct crypto_scomp *tfm,
84 const u8 *src, unsigned int slen,
85 u8 *dst, unsigned int *dlen,
86 void *ctx)
87 {
88 return crypto_scomp_alg(tfm)->decompress(tfm, src, slen, dst, dlen,
89 ctx);
90 }
91
92 int crypto_init_scomp_ops_async(struct crypto_tfm *tfm);
93 struct acomp_req *crypto_acomp_scomp_alloc_ctx(struct acomp_req *req);
94 void crypto_acomp_scomp_free_ctx(struct acomp_req *req);
95
96 /**
97 * crypto_register_scomp() -- Register synchronous compression algorithm
98 *
99 * Function registers an implementation of a synchronous
100 * compression algorithm
101 *
102 * @alg: algorithm definition
103 *
104 * Return: zero on success; error code in case of error
105 */
106 int crypto_register_scomp(struct scomp_alg *alg);
107
108 /**
109 * crypto_unregister_scomp() -- Unregister synchronous compression algorithm
110 *
111 * Function unregisters an implementation of a synchronous
112 * compression algorithm
113 *
114 * @alg: algorithm definition
115 *
116 * Return: zero on success; error code in case of error
117 */
118 int crypto_unregister_scomp(struct scomp_alg *alg);
119
120 int crypto_register_scomps(struct scomp_alg *algs, int count);
121 void crypto_unregister_scomps(struct scomp_alg *algs, int count);
122
123 #endif
124
