include/crypto/internal/aead.h

   1 /*
   2  * AEAD: Authenticated Encryption with Associated Data
   3  *
   4  * Copyright (c) 2007-2015 Herbert Xu <herbert@gondor.apana.org.au>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the Free
   8  * Software Foundation; either version 2 of the License, or (at your option)
   9  * any later version.
  10  *
  11  */
  12
  13 #ifndef _CRYPTO_INTERNAL_AEAD_H
  14 #define _CRYPTO_INTERNAL_AEAD_H
  15
  16 #include <crypto/aead.h>
  17 #include <crypto/algapi.h>
  18 #include <linux/stddef.h>
  19 #include <linux/types.h>
  20
  21 struct rtattr;
  22
  23 struct aead_instance {
  24         void (*free)(struct aead_instance *inst);
  25         union {
  26                 struct {
  27                         char head[offsetof(struct aead_alg, base)];
  28                         struct crypto_instance base;
  29                 } s;
  30                 struct aead_alg alg;
  31         };
  32 };
  33
  34 struct crypto_aead_spawn {
  35         struct crypto_spawn base;
  36 };
  37
  38 struct aead_queue {
  39         struct crypto_queue base;
  40 };
  41
  42 static inline void *crypto_aead_ctx(struct crypto_aead *tfm)
  43 {
  44         return crypto_tfm_ctx(&tfm->base);
  45 }
  46
  47 static inline struct crypto_instance *aead_crypto_instance(
  48         struct aead_instance *inst)
  49 {
  50         return container_of(&inst->alg.base, struct crypto_instance, alg);
  51 }
  52
  53 static inline struct aead_instance *aead_instance(struct crypto_instance *inst)
  54 {
  55         return container_of(&inst->alg, struct aead_instance, alg.base);
  56 }
  57
  58 static inline struct aead_instance *aead_alg_instance(struct crypto_aead *aead)
  59 {
  60         return aead_instance(crypto_tfm_alg_instance(&aead->base));
  61 }
  62
  63 static inline void *aead_instance_ctx(struct aead_instance *inst)
  64 {
  65         return crypto_instance_ctx(aead_crypto_instance(inst));
  66 }
  67
  68 static inline void *aead_request_ctx(struct aead_request *req)
  69 {
  70         return req->__ctx;
  71 }
  72
  73 static inline void aead_request_complete(struct aead_request *req, int err)
  74 {
  75         req->base.complete(&req->base, err);
  76 }
  77
  78 static inline u32 aead_request_flags(struct aead_request *req)
  79 {
  80         return req->base.flags;
  81 }
  82
  83 static inline struct aead_request *aead_request_cast(
  84         struct crypto_async_request *req)
  85 {
  86         return container_of(req, struct aead_request, base);
  87 }
  88
  89 static inline void crypto_set_aead_spawn(
  90         struct crypto_aead_spawn *spawn, struct crypto_instance *inst)
  91 {
  92         crypto_set_spawn(&spawn->base, inst);
  93 }
  94
  95 int crypto_grab_aead(struct crypto_aead_spawn *spawn, const char *name,
  96                      u32 type, u32 mask);
  97
  98 static inline void crypto_drop_aead(struct crypto_aead_spawn *spawn)
  99 {
 100         crypto_drop_spawn(&spawn->base);
 101 }
 102
 103 static inline struct aead_alg *crypto_spawn_aead_alg(
 104         struct crypto_aead_spawn *spawn)
 105 {
 106         return container_of(spawn->base.alg, struct aead_alg, base);
 107 }
 108
 109 static inline struct crypto_aead *crypto_spawn_aead(
 110         struct crypto_aead_spawn *spawn)
 111 {
 112         return crypto_spawn_tfm2(&spawn->base);
 113 }
 114
 115 static inline void crypto_aead_set_reqsize(struct crypto_aead *aead,
 116                                            unsigned int reqsize)
 117 {
 118         aead->reqsize = reqsize;
 119 }
 120
 121 static inline unsigned int crypto_aead_alg_maxauthsize(struct aead_alg *alg)
 122 {
 123         return alg->maxauthsize;
 124 }
 125
 126 static inline unsigned int crypto_aead_maxauthsize(struct crypto_aead *aead)
 127 {
 128         return crypto_aead_alg_maxauthsize(crypto_aead_alg(aead));
 129 }
 130
 131 static inline void aead_init_queue(struct aead_queue *queue,
 132                                    unsigned int max_qlen)
 133 {
 134         crypto_init_queue(&queue->base, max_qlen);
 135 }
 136
 137 static inline int aead_enqueue_request(struct aead_queue *queue,
 138                                        struct aead_request *request)
 139 {
 140         return crypto_enqueue_request(&queue->base, &request->base);
 141 }
 142
 143 static inline struct aead_request *aead_dequeue_request(
 144         struct aead_queue *queue)
 145 {
 146         struct crypto_async_request *req;
 147
 148         req = crypto_dequeue_request(&queue->base);
 149
 150         return req ? container_of(req, struct aead_request, base) : NULL;
 151 }
 152
 153 static inline struct aead_request *aead_get_backlog(struct aead_queue *queue)
 154 {
 155         struct crypto_async_request *req;
 156
 157         req = crypto_get_backlog(&queue->base);
 158
 159         return req ? container_of(req, struct aead_request, base) : NULL;
 160 }
 161
 162 static inline unsigned int crypto_aead_alg_chunksize(struct aead_alg *alg)
 163 {
 164         return alg->chunksize;
 165 }
 166
 167 /**
 168  * crypto_aead_chunksize() - obtain chunk size
 169  * @tfm: cipher handle
 170  *
 171  * The block size is set to one for ciphers such as CCM.  However,
 172  * you still need to provide incremental updates in multiples of
 173  * the underlying block size as the IV does not have sub-block
 174  * granularity.  This is known in this API as the chunk size.
 175  *
 176  * Return: chunk size in bytes
 177  */
 178 static inline unsigned int crypto_aead_chunksize(struct crypto_aead *tfm)
 179 {
 180         return crypto_aead_alg_chunksize(crypto_aead_alg(tfm));
 181 }
 182
 183 int crypto_register_aead(struct aead_alg *alg);
 184 void crypto_unregister_aead(struct aead_alg *alg);
 185 int crypto_register_aeads(struct aead_alg *algs, int count);
 186 void crypto_unregister_aeads(struct aead_alg *algs, int count);
 187 int aead_register_instance(struct crypto_template *tmpl,
 188                            struct aead_instance *inst);
 189
 190 #endif  /* _CRYPTO_INTERNAL_AEAD_H */
 191