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