include/crypto/internal/skcipher.h

   1 /*
   2  * Symmetric key ciphers.
   3  *
   4  * Copyright (c) 2007 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_SKCIPHER_H
  14 #define _CRYPTO_INTERNAL_SKCIPHER_H
  15
  16 #include <crypto/algapi.h>
  17 #include <crypto/skcipher.h>
  18 #include <linux/list.h>
  19 #include <linux/types.h>
  20
  21 struct aead_request;
  22 struct rtattr;
  23
  24 struct skcipher_instance {
  25         void (*free)(struct skcipher_instance *inst);
  26         union {
  27                 struct {
  28                         char head[offsetof(struct skcipher_alg, base)];
  29                         struct crypto_instance base;
  30                 } s;
  31                 struct skcipher_alg alg;
  32         };
  33 };
  34
  35 struct crypto_skcipher_spawn {
  36         struct crypto_spawn base;
  37 };
  38
  39 struct skcipher_walk {
  40         union {
  41                 struct {
  42                         struct page *page;
  43                         unsigned long offset;
  44                 } phys;
  45
  46                 struct {
  47                         u8 *page;
  48                         void *addr;
  49                 } virt;
  50         } src, dst;
  51
  52         struct scatter_walk in;
  53         unsigned int nbytes;
  54
  55         struct scatter_walk out;
  56         unsigned int total;
  57
  58         struct list_head buffers;
  59
  60         u8 *page;
  61         u8 *buffer;
  62         u8 *oiv;
  63         void *iv;
  64
  65         unsigned int ivsize;
  66
  67         int flags;
  68         unsigned int blocksize;
  69         unsigned int stride;
  70         unsigned int alignmask;
  71 };
  72
  73 extern const struct crypto_type crypto_givcipher_type;
  74
  75 static inline struct crypto_instance *skcipher_crypto_instance(
  76         struct skcipher_instance *inst)
  77 {
  78         return &inst->s.base;
  79 }
  80
  81 static inline struct skcipher_instance *skcipher_alg_instance(
  82         struct crypto_skcipher *skcipher)
  83 {
  84         return container_of(crypto_skcipher_alg(skcipher),
  85                             struct skcipher_instance, alg);
  86 }
  87
  88 static inline void *skcipher_instance_ctx(struct skcipher_instance *inst)
  89 {
  90         return crypto_instance_ctx(skcipher_crypto_instance(inst));
  91 }
  92
  93 static inline void skcipher_request_complete(struct skcipher_request *req, int err)
  94 {
  95         req->base.complete(&req->base, err);
  96 }
  97
  98 static inline void crypto_set_skcipher_spawn(
  99         struct crypto_skcipher_spawn *spawn, struct crypto_instance *inst)
 100 {
 101         crypto_set_spawn(&spawn->base, inst);
 102 }
 103
 104 int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name,
 105                          u32 type, u32 mask);
 106
 107 static inline void crypto_drop_skcipher(struct crypto_skcipher_spawn *spawn)
 108 {
 109         crypto_drop_spawn(&spawn->base);
 110 }
 111
 112 static inline struct skcipher_alg *crypto_skcipher_spawn_alg(
 113         struct crypto_skcipher_spawn *spawn)
 114 {
 115         return container_of(spawn->base.alg, struct skcipher_alg, base);
 116 }
 117
 118 static inline struct skcipher_alg *crypto_spawn_skcipher_alg(
 119         struct crypto_skcipher_spawn *spawn)
 120 {
 121         return crypto_skcipher_spawn_alg(spawn);
 122 }
 123
 124 static inline struct crypto_skcipher *crypto_spawn_skcipher(
 125         struct crypto_skcipher_spawn *spawn)
 126 {
 127         return crypto_spawn_tfm2(&spawn->base);
 128 }
 129
 130 static inline void crypto_skcipher_set_reqsize(
 131         struct crypto_skcipher *skcipher, unsigned int reqsize)
 132 {
 133         skcipher->reqsize = reqsize;
 134 }
 135
 136 int crypto_register_skcipher(struct skcipher_alg *alg);
 137 void crypto_unregister_skcipher(struct skcipher_alg *alg);
 138 int crypto_register_skciphers(struct skcipher_alg *algs, int count);
 139 void crypto_unregister_skciphers(struct skcipher_alg *algs, int count);
 140 int skcipher_register_instance(struct crypto_template *tmpl,
 141                                struct skcipher_instance *inst);
 142
 143 int skcipher_walk_done(struct skcipher_walk *walk, int err);
 144 int skcipher_walk_virt(struct skcipher_walk *walk,
 145                        struct skcipher_request *req,
 146                        bool atomic);
 147 void skcipher_walk_atomise(struct skcipher_walk *walk);
 148 int skcipher_walk_async(struct skcipher_walk *walk,
 149                         struct skcipher_request *req);
 150 int skcipher_walk_aead(struct skcipher_walk *walk, struct aead_request *req,
 151                        bool atomic);
 152 int skcipher_walk_aead_encrypt(struct skcipher_walk *walk,
 153                                struct aead_request *req, bool atomic);
 154 int skcipher_walk_aead_decrypt(struct skcipher_walk *walk,
 155                                struct aead_request *req, bool atomic);
 156 void skcipher_walk_complete(struct skcipher_walk *walk, int err);
 157
 158 static inline void ablkcipher_request_complete(struct ablkcipher_request *req,
 159                                                int err)
 160 {
 161         req->base.complete(&req->base, err);
 162 }
 163
 164 static inline u32 ablkcipher_request_flags(struct ablkcipher_request *req)
 165 {
 166         return req->base.flags;
 167 }
 168
 169 static inline void *crypto_skcipher_ctx(struct crypto_skcipher *tfm)
 170 {
 171         return crypto_tfm_ctx(&tfm->base);
 172 }
 173
 174 static inline void *skcipher_request_ctx(struct skcipher_request *req)
 175 {
 176         return req->__ctx;
 177 }
 178
 179 static inline u32 skcipher_request_flags(struct skcipher_request *req)
 180 {
 181         return req->base.flags;
 182 }
 183
 184 static inline unsigned int crypto_skcipher_alg_min_keysize(
 185         struct skcipher_alg *alg)
 186 {
 187         if ((alg->base.cra_flags & CRYPTO_ALG_TYPE_MASK) ==
 188             CRYPTO_ALG_TYPE_BLKCIPHER)
 189                 return alg->base.cra_blkcipher.min_keysize;
 190
 191         if (alg->base.cra_ablkcipher.encrypt)
 192                 return alg->base.cra_ablkcipher.min_keysize;
 193
 194         return alg->min_keysize;
 195 }
 196
 197 static inline unsigned int crypto_skcipher_alg_max_keysize(
 198         struct skcipher_alg *alg)
 199 {
 200         if ((alg->base.cra_flags & CRYPTO_ALG_TYPE_MASK) ==
 201             CRYPTO_ALG_TYPE_BLKCIPHER)
 202                 return alg->base.cra_blkcipher.max_keysize;
 203
 204         if (alg->base.cra_ablkcipher.encrypt)
 205                 return alg->base.cra_ablkcipher.max_keysize;
 206
 207         return alg->max_keysize;
 208 }
 209
 210 #endif  /* _CRYPTO_INTERNAL_SKCIPHER_H */
 211