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  * @base:	Common crypto API algorithm data structure
32  */
33 struct scomp_alg {
34 	void *(*alloc_ctx)(struct crypto_scomp *tfm);
35 	void (*free_ctx)(struct crypto_scomp *tfm, void *ctx);
36 	int (*compress)(struct crypto_scomp *tfm, const u8 *src,
37 			unsigned int slen, u8 *dst, unsigned int *dlen,
38 			void *ctx);
39 	int (*decompress)(struct crypto_scomp *tfm, const u8 *src,
40 			  unsigned int slen, u8 *dst, unsigned int *dlen,
41 			  void *ctx);
42 	struct crypto_alg base;
43 };
44 
45 static inline struct scomp_alg *__crypto_scomp_alg(struct crypto_alg *alg)
46 {
47 	return container_of(alg, struct scomp_alg, base);
48 }
49 
50 static inline struct crypto_scomp *__crypto_scomp_tfm(struct crypto_tfm *tfm)
51 {
52 	return container_of(tfm, struct crypto_scomp, base);
53 }
54 
55 static inline struct crypto_tfm *crypto_scomp_tfm(struct crypto_scomp *tfm)
56 {
57 	return &tfm->base;
58 }
59 
60 static inline void crypto_free_scomp(struct crypto_scomp *tfm)
61 {
62 	crypto_destroy_tfm(tfm, crypto_scomp_tfm(tfm));
63 }
64 
65 static inline struct scomp_alg *crypto_scomp_alg(struct crypto_scomp *tfm)
66 {
67 	return __crypto_scomp_alg(crypto_scomp_tfm(tfm)->__crt_alg);
68 }
69 
70 static inline void *crypto_scomp_alloc_ctx(struct crypto_scomp *tfm)
71 {
72 	return crypto_scomp_alg(tfm)->alloc_ctx(tfm);
73 }
74 
75 static inline void crypto_scomp_free_ctx(struct crypto_scomp *tfm,
76 					 void *ctx)
77 {
78 	return crypto_scomp_alg(tfm)->free_ctx(tfm, ctx);
79 }
80 
81 static inline int crypto_scomp_compress(struct crypto_scomp *tfm,
82 					const u8 *src, unsigned int slen,
83 					u8 *dst, unsigned int *dlen, void *ctx)
84 {
85 	return crypto_scomp_alg(tfm)->compress(tfm, src, slen, dst, dlen, ctx);
86 }
87 
88 static inline int crypto_scomp_decompress(struct crypto_scomp *tfm,
89 					  const u8 *src, unsigned int slen,
90 					  u8 *dst, unsigned int *dlen,
91 					  void *ctx)
92 {
93 	return crypto_scomp_alg(tfm)->decompress(tfm, src, slen, dst, dlen,
94 						 ctx);
95 }
96 
97 int crypto_init_scomp_ops_async(struct crypto_tfm *tfm);
98 struct acomp_req *crypto_acomp_scomp_alloc_ctx(struct acomp_req *req);
99 void crypto_acomp_scomp_free_ctx(struct acomp_req *req);
100 
101 /**
102  * crypto_register_scomp() -- Register synchronous compression algorithm
103  *
104  * Function registers an implementation of a synchronous
105  * compression algorithm
106  *
107  * @alg:	algorithm definition
108  *
109  * Return: zero on success; error code in case of error
110  */
111 int crypto_register_scomp(struct scomp_alg *alg);
112 
113 /**
114  * crypto_unregister_scomp() -- Unregister synchronous compression algorithm
115  *
116  * Function unregisters an implementation of a synchronous
117  * compression algorithm
118  *
119  * @alg:	algorithm definition
120  *
121  * Return: zero on success; error code in case of error
122  */
123 int crypto_unregister_scomp(struct scomp_alg *alg);
124 
125 int crypto_register_scomps(struct scomp_alg *algs, int count);
126 void crypto_unregister_scomps(struct scomp_alg *algs, int count);
127 
128 #endif
129