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 static inline struct crypto_instance *skcipher_crypto_instance(
  74         struct skcipher_instance *inst)
  75 {
  76         return &inst->s.base;
  77 }
  78
  79 static inline struct skcipher_instance *skcipher_alg_instance(
  80         struct crypto_skcipher *skcipher)
  81 {
  82         return container_of(crypto_skcipher_alg(skcipher),
  83                             struct skcipher_instance, alg);
  84 }
  85
  86 static inline void *skcipher_instance_ctx(struct skcipher_instance *inst)
  87 {
  88         return crypto_instance_ctx(skcipher_crypto_instance(inst));
  89 }
  90
  91 static inline void skcipher_request_complete(struct skcipher_request *req, int err)
  92 {
  93         req->base.complete(&req->base, err);
  94 }
  95
  96 static inline void crypto_set_skcipher_spawn(
  97         struct crypto_skcipher_spawn *spawn, struct crypto_instance *inst)
  98 {
  99         crypto_set_spawn(&spawn->base, inst);
 100 }
 101
 102 int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name,
 103                          u32 type, u32 mask);
 104
 105 static inline void crypto_drop_skcipher(struct crypto_skcipher_spawn *spawn)
 106 {
 107         crypto_drop_spawn(&spawn->base);
 108 }
 109
 110 static inline struct skcipher_alg *crypto_skcipher_spawn_alg(
 111         struct crypto_skcipher_spawn *spawn)
 112 {
 113         return container_of(spawn->base.alg, struct skcipher_alg, base);
 114 }
 115
 116 static inline struct skcipher_alg *crypto_spawn_skcipher_alg(
 117         struct crypto_skcipher_spawn *spawn)
 118 {
 119         return crypto_skcipher_spawn_alg(spawn);
 120 }
 121
 122 static inline struct crypto_skcipher *crypto_spawn_skcipher(
 123         struct crypto_skcipher_spawn *spawn)
 124 {
 125         return crypto_spawn_tfm2(&spawn->base);
 126 }
 127
 128 static inline void crypto_skcipher_set_reqsize(
 129         struct crypto_skcipher *skcipher, unsigned int reqsize)
 130 {
 131         skcipher->reqsize = reqsize;
 132 }
 133
 134 int crypto_register_skcipher(struct skcipher_alg *alg);
 135 void crypto_unregister_skcipher(struct skcipher_alg *alg);
 136 int crypto_register_skciphers(struct skcipher_alg *algs, int count);
 137 void crypto_unregister_skciphers(struct skcipher_alg *algs, int count);
 138 int skcipher_register_instance(struct crypto_template *tmpl,
 139                                struct skcipher_instance *inst);
 140
 141 int skcipher_walk_done(struct skcipher_walk *walk, int err);
 142 int skcipher_walk_virt(struct skcipher_walk *walk,
 143                        struct skcipher_request *req,
 144                        bool atomic);
 145 void skcipher_walk_atomise(struct skcipher_walk *walk);
 146 int skcipher_walk_async(struct skcipher_walk *walk,
 147                         struct skcipher_request *req);
 148 int skcipher_walk_aead(struct skcipher_walk *walk, struct aead_request *req,
 149                        bool atomic);
 150 int skcipher_walk_aead_encrypt(struct skcipher_walk *walk,
 151                                struct aead_request *req, bool atomic);
 152 int skcipher_walk_aead_decrypt(struct skcipher_walk *walk,
 153                                struct aead_request *req, bool atomic);
 154 void skcipher_walk_complete(struct skcipher_walk *walk, int err);
 155
 156 static inline void ablkcipher_request_complete(struct ablkcipher_request *req,
 157                                                int err)
 158 {
 159         req->base.complete(&req->base, err);
 160 }
 161
 162 static inline u32 ablkcipher_request_flags(struct ablkcipher_request *req)
 163 {
 164         return req->base.flags;
 165 }
 166
 167 static inline void *crypto_skcipher_ctx(struct crypto_skcipher *tfm)
 168 {
 169         return crypto_tfm_ctx(&tfm->base);
 170 }
 171
 172 static inline void *skcipher_request_ctx(struct skcipher_request *req)
 173 {
 174         return req->__ctx;
 175 }
 176
 177 static inline u32 skcipher_request_flags(struct skcipher_request *req)
 178 {
 179         return req->base.flags;
 180 }
 181
 182 static inline unsigned int crypto_skcipher_alg_min_keysize(
 183         struct skcipher_alg *alg)
 184 {
 185         if ((alg->base.cra_flags & CRYPTO_ALG_TYPE_MASK) ==
 186             CRYPTO_ALG_TYPE_BLKCIPHER)
 187                 return alg->base.cra_blkcipher.min_keysize;
 188
 189         if (alg->base.cra_ablkcipher.encrypt)
 190                 return alg->base.cra_ablkcipher.min_keysize;
 191
 192         return alg->min_keysize;
 193 }
 194
 195 static inline unsigned int crypto_skcipher_alg_max_keysize(
 196         struct skcipher_alg *alg)
 197 {
 198         if ((alg->base.cra_flags & CRYPTO_ALG_TYPE_MASK) ==
 199             CRYPTO_ALG_TYPE_BLKCIPHER)
 200                 return alg->base.cra_blkcipher.max_keysize;
 201
 202         if (alg->base.cra_ablkcipher.encrypt)
 203                 return alg->base.cra_ablkcipher.max_keysize;
 204
 205         return alg->max_keysize;
 206 }
 207
 208 /* Helpers for simple block cipher modes of operation */
 209 struct skcipher_ctx_simple {
 210         struct crypto_cipher *cipher;   /* underlying block cipher */
 211 };
 212 static inline struct crypto_cipher *
 213 skcipher_cipher_simple(struct crypto_skcipher *tfm)
 214 {
 215         struct skcipher_ctx_simple *ctx = crypto_skcipher_ctx(tfm);
 216
 217         return ctx->cipher;
 218 }
 219 struct skcipher_instance *
 220 skcipher_alloc_instance_simple(struct crypto_template *tmpl, struct rtattr **tb,
 221                                struct crypto_alg **cipher_alg_ret);
 222
 223 #endif  /* _CRYPTO_INTERNAL_SKCIPHER_H */
 224