1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Key-agreement Protocol Primitives (KPP) 4 * 5 * Copyright (c) 2016, Intel Corporation 6 * Authors: Salvatore Benedetto <salvatore.benedetto@intel.com> 7 */ 8 #ifndef _CRYPTO_KPP_INT_H 9 #define _CRYPTO_KPP_INT_H 10 #include <crypto/kpp.h> 11 #include <crypto/algapi.h> 12 13 /** 14 * struct kpp_instance - KPP template instance 15 * @free: Callback getting invoked upon instance destruction. Must be set. 16 * @s: Internal. Generic crypto core instance state properly layout 17 * to alias with @alg as needed. 18 * @alg: The &struct kpp_alg implementation provided by the instance. 19 */ 20 struct kpp_instance { 21 void (*free)(struct kpp_instance *inst); 22 union { 23 struct { 24 char head[offsetof(struct kpp_alg, base)]; 25 struct crypto_instance base; 26 } s; 27 struct kpp_alg alg; 28 }; 29 }; 30 31 /** 32 * struct crypto_kpp_spawn - KPP algorithm spawn 33 * @base: Internal. Generic crypto core spawn state. 34 * 35 * Template instances can get a hold on some inner KPP algorithm by 36 * binding a &struct crypto_kpp_spawn via 37 * crypto_grab_kpp(). Transforms may subsequently get instantiated 38 * from the referenced inner &struct kpp_alg by means of 39 * crypto_spawn_kpp(). 40 */ 41 struct crypto_kpp_spawn { 42 struct crypto_spawn base; 43 }; 44 45 /* 46 * Transform internal helpers. 47 */ 48 static inline void *kpp_request_ctx(struct kpp_request *req) 49 { 50 return req->__ctx; 51 } 52 53 static inline void *kpp_request_ctx_dma(struct kpp_request *req) 54 { 55 unsigned int align = crypto_dma_align(); 56 57 if (align <= crypto_tfm_ctx_alignment()) 58 align = 1; 59 60 return PTR_ALIGN(kpp_request_ctx(req), align); 61 } 62 63 static inline void kpp_set_reqsize(struct crypto_kpp *kpp, 64 unsigned int reqsize) 65 { 66 kpp->reqsize = reqsize; 67 } 68 69 static inline void kpp_set_reqsize_dma(struct crypto_kpp *kpp, 70 unsigned int reqsize) 71 { 72 reqsize += crypto_dma_align() & ~(crypto_tfm_ctx_alignment() - 1); 73 kpp->reqsize = reqsize; 74 } 75 76 static inline void *kpp_tfm_ctx(struct crypto_kpp *tfm) 77 { 78 return crypto_tfm_ctx(&tfm->base); 79 } 80 81 static inline void *kpp_tfm_ctx_dma(struct crypto_kpp *tfm) 82 { 83 return crypto_tfm_ctx_dma(&tfm->base); 84 } 85 86 static inline void kpp_request_complete(struct kpp_request *req, int err) 87 { 88 req->base.complete(&req->base, err); 89 } 90 91 static inline const char *kpp_alg_name(struct crypto_kpp *tfm) 92 { 93 return crypto_kpp_tfm(tfm)->__crt_alg->cra_name; 94 } 95 96 /* 97 * Template instance internal helpers. 98 */ 99 /** 100 * kpp_crypto_instance() - Cast a &struct kpp_instance to the corresponding 101 * generic &struct crypto_instance. 102 * @inst: Pointer to the &struct kpp_instance to be cast. 103 * Return: A pointer to the &struct crypto_instance embedded in @inst. 104 */ 105 static inline struct crypto_instance *kpp_crypto_instance( 106 struct kpp_instance *inst) 107 { 108 return &inst->s.base; 109 } 110 111 /** 112 * kpp_instance() - Cast a generic &struct crypto_instance to the corresponding 113 * &struct kpp_instance. 114 * @inst: Pointer to the &struct crypto_instance to be cast. 115 * Return: A pointer to the &struct kpp_instance @inst is embedded in. 116 */ 117 static inline struct kpp_instance *kpp_instance(struct crypto_instance *inst) 118 { 119 return container_of(inst, struct kpp_instance, s.base); 120 } 121 122 /** 123 * kpp_alg_instance() - Get the &struct kpp_instance a given KPP transform has 124 * been instantiated from. 125 * @kpp: The KPP transform instantiated from some &struct kpp_instance. 126 * Return: The &struct kpp_instance associated with @kpp. 127 */ 128 static inline struct kpp_instance *kpp_alg_instance(struct crypto_kpp *kpp) 129 { 130 return kpp_instance(crypto_tfm_alg_instance(&kpp->base)); 131 } 132 133 /** 134 * kpp_instance_ctx() - Get a pointer to a &struct kpp_instance's implementation 135 * specific context data. 136 * @inst: The &struct kpp_instance whose context data to access. 137 * 138 * A KPP template implementation may allocate extra memory beyond the 139 * end of a &struct kpp_instance instantiated from &crypto_template.create(). 140 * This function provides a means to obtain a pointer to this area. 141 * 142 * Return: A pointer to the implementation specific context data. 143 */ 144 static inline void *kpp_instance_ctx(struct kpp_instance *inst) 145 { 146 return crypto_instance_ctx(kpp_crypto_instance(inst)); 147 } 148 149 /* 150 * KPP algorithm (un)registration functions. 151 */ 152 /** 153 * crypto_register_kpp() -- Register key-agreement protocol primitives algorithm 154 * 155 * Function registers an implementation of a key-agreement protocol primitive 156 * algorithm 157 * 158 * @alg: algorithm definition 159 * 160 * Return: zero on success; error code in case of error 161 */ 162 int crypto_register_kpp(struct kpp_alg *alg); 163 164 /** 165 * crypto_unregister_kpp() -- Unregister key-agreement protocol primitive 166 * algorithm 167 * 168 * Function unregisters an implementation of a key-agreement protocol primitive 169 * algorithm 170 * 171 * @alg: algorithm definition 172 */ 173 void crypto_unregister_kpp(struct kpp_alg *alg); 174 175 /** 176 * kpp_register_instance() - Register a KPP template instance. 177 * @tmpl: The instantiating template. 178 * @inst: The KPP template instance to be registered. 179 * Return: %0 on success, negative error code otherwise. 180 */ 181 int kpp_register_instance(struct crypto_template *tmpl, 182 struct kpp_instance *inst); 183 184 /* 185 * KPP spawn related functions. 186 */ 187 /** 188 * crypto_grab_kpp() - Look up a KPP algorithm and bind a spawn to it. 189 * @spawn: The KPP spawn to bind. 190 * @inst: The template instance owning @spawn. 191 * @name: The KPP algorithm name to look up. 192 * @type: The type bitset to pass on to the lookup. 193 * @mask: The mask bismask to pass on to the lookup. 194 * Return: %0 on success, a negative error code otherwise. 195 */ 196 int crypto_grab_kpp(struct crypto_kpp_spawn *spawn, 197 struct crypto_instance *inst, 198 const char *name, u32 type, u32 mask); 199 200 /** 201 * crypto_drop_kpp() - Release a spawn previously bound via crypto_grab_kpp(). 202 * @spawn: The spawn to release. 203 */ 204 static inline void crypto_drop_kpp(struct crypto_kpp_spawn *spawn) 205 { 206 crypto_drop_spawn(&spawn->base); 207 } 208 209 /** 210 * crypto_spawn_kpp_alg() - Get the algorithm a KPP spawn has been bound to. 211 * @spawn: The spawn to get the referenced &struct kpp_alg for. 212 * 213 * This function as well as the returned result are safe to use only 214 * after @spawn has been successfully bound via crypto_grab_kpp() and 215 * up to until the template instance owning @spawn has either been 216 * registered successfully or the spawn has been released again via 217 * crypto_drop_spawn(). 218 * 219 * Return: A pointer to the &struct kpp_alg referenced from the spawn. 220 */ 221 static inline struct kpp_alg *crypto_spawn_kpp_alg( 222 struct crypto_kpp_spawn *spawn) 223 { 224 return container_of(spawn->base.alg, struct kpp_alg, base); 225 } 226 227 /** 228 * crypto_spawn_kpp() - Create a transform from a KPP spawn. 229 * @spawn: The spawn previously bound to some &struct kpp_alg via 230 * crypto_grab_kpp(). 231 * 232 * Once a &struct crypto_kpp_spawn has been successfully bound to a 233 * &struct kpp_alg via crypto_grab_kpp(), transforms for the latter 234 * may get instantiated from the former by means of this function. 235 * 236 * Return: A pointer to the freshly created KPP transform on success 237 * or an ``ERR_PTR()`` otherwise. 238 */ 239 static inline struct crypto_kpp *crypto_spawn_kpp( 240 struct crypto_kpp_spawn *spawn) 241 { 242 return crypto_spawn_tfm2(&spawn->base); 243 } 244 245 #endif 246