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 
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 
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 
50 static inline struct crypto_tfm *crypto_scomp_tfm(struct crypto_scomp *tfm)
51 {
52 	return &tfm->base;
53 }
54 
55 static inline void crypto_free_scomp(struct crypto_scomp *tfm)
56 {
57 	crypto_destroy_tfm(tfm, crypto_scomp_tfm(tfm));
58 }
59 
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 
65 static inline void *crypto_scomp_alloc_ctx(struct crypto_scomp *tfm)
66 {
67 	return crypto_scomp_alg(tfm)->alloc_ctx(tfm);
68 }
69 
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 
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 
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 void crypto_unregister_scomp(struct scomp_alg *alg);
117 
118 int crypto_register_scomps(struct scomp_alg *algs, int count);
119 void crypto_unregister_scomps(struct scomp_alg *algs, int count);
120 
121 #endif
122