linux/include/crypto/internal/skcipher.h
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   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/*
   3 * Symmetric key ciphers.
   4 * 
   5 * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
   6 */
   7
   8#ifndef _CRYPTO_INTERNAL_SKCIPHER_H
   9#define _CRYPTO_INTERNAL_SKCIPHER_H
  10
  11#include <crypto/algapi.h>
  12#include <crypto/internal/cipher.h>
  13#include <crypto/skcipher.h>
  14#include <linux/list.h>
  15#include <linux/types.h>
  16
  17struct aead_request;
  18struct rtattr;
  19
  20struct skcipher_instance {
  21        void (*free)(struct skcipher_instance *inst);
  22        union {
  23                struct {
  24                        char head[offsetof(struct skcipher_alg, base)];
  25                        struct crypto_instance base;
  26                } s;
  27                struct skcipher_alg alg;
  28        };
  29};
  30
  31struct crypto_skcipher_spawn {
  32        struct crypto_spawn base;
  33};
  34
  35struct skcipher_walk {
  36        union {
  37                struct {
  38                        struct page *page;
  39                        unsigned long offset;
  40                } phys;
  41
  42                struct {
  43                        u8 *page;
  44                        void *addr;
  45                } virt;
  46        } src, dst;
  47
  48        struct scatter_walk in;
  49        unsigned int nbytes;
  50
  51        struct scatter_walk out;
  52        unsigned int total;
  53
  54        struct list_head buffers;
  55
  56        u8 *page;
  57        u8 *buffer;
  58        u8 *oiv;
  59        void *iv;
  60
  61        unsigned int ivsize;
  62
  63        int flags;
  64        unsigned int blocksize;
  65        unsigned int stride;
  66        unsigned int alignmask;
  67};
  68
  69static inline struct crypto_instance *skcipher_crypto_instance(
  70        struct skcipher_instance *inst)
  71{
  72        return &inst->s.base;
  73}
  74
  75static inline struct skcipher_instance *skcipher_alg_instance(
  76        struct crypto_skcipher *skcipher)
  77{
  78        return container_of(crypto_skcipher_alg(skcipher),
  79                            struct skcipher_instance, alg);
  80}
  81
  82static inline void *skcipher_instance_ctx(struct skcipher_instance *inst)
  83{
  84        return crypto_instance_ctx(skcipher_crypto_instance(inst));
  85}
  86
  87static inline void skcipher_request_complete(struct skcipher_request *req, int err)
  88{
  89        req->base.complete(&req->base, err);
  90}
  91
  92int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn,
  93                         struct crypto_instance *inst,
  94                         const char *name, u32 type, u32 mask);
  95
  96static inline void crypto_drop_skcipher(struct crypto_skcipher_spawn *spawn)
  97{
  98        crypto_drop_spawn(&spawn->base);
  99}
 100
 101static inline struct skcipher_alg *crypto_skcipher_spawn_alg(
 102        struct crypto_skcipher_spawn *spawn)
 103{
 104        return container_of(spawn->base.alg, struct skcipher_alg, base);
 105}
 106
 107static inline struct skcipher_alg *crypto_spawn_skcipher_alg(
 108        struct crypto_skcipher_spawn *spawn)
 109{
 110        return crypto_skcipher_spawn_alg(spawn);
 111}
 112
 113static inline struct crypto_skcipher *crypto_spawn_skcipher(
 114        struct crypto_skcipher_spawn *spawn)
 115{
 116        return crypto_spawn_tfm2(&spawn->base);
 117}
 118
 119static inline void crypto_skcipher_set_reqsize(
 120        struct crypto_skcipher *skcipher, unsigned int reqsize)
 121{
 122        skcipher->reqsize = reqsize;
 123}
 124
 125int crypto_register_skcipher(struct skcipher_alg *alg);
 126void crypto_unregister_skcipher(struct skcipher_alg *alg);
 127int crypto_register_skciphers(struct skcipher_alg *algs, int count);
 128void crypto_unregister_skciphers(struct skcipher_alg *algs, int count);
 129int skcipher_register_instance(struct crypto_template *tmpl,
 130                               struct skcipher_instance *inst);
 131
 132int skcipher_walk_done(struct skcipher_walk *walk, int err);
 133int skcipher_walk_virt(struct skcipher_walk *walk,
 134                       struct skcipher_request *req,
 135                       bool atomic);
 136int skcipher_walk_async(struct skcipher_walk *walk,
 137                        struct skcipher_request *req);
 138int skcipher_walk_aead_encrypt(struct skcipher_walk *walk,
 139                               struct aead_request *req, bool atomic);
 140int skcipher_walk_aead_decrypt(struct skcipher_walk *walk,
 141                               struct aead_request *req, bool atomic);
 142void skcipher_walk_complete(struct skcipher_walk *walk, int err);
 143
 144static inline void skcipher_walk_abort(struct skcipher_walk *walk)
 145{
 146        skcipher_walk_done(walk, -ECANCELED);
 147}
 148
 149static inline void *crypto_skcipher_ctx(struct crypto_skcipher *tfm)
 150{
 151        return crypto_tfm_ctx(&tfm->base);
 152}
 153
 154static inline void *skcipher_request_ctx(struct skcipher_request *req)
 155{
 156        return req->__ctx;
 157}
 158
 159static inline u32 skcipher_request_flags(struct skcipher_request *req)
 160{
 161        return req->base.flags;
 162}
 163
 164static inline unsigned int crypto_skcipher_alg_min_keysize(
 165        struct skcipher_alg *alg)
 166{
 167        return alg->min_keysize;
 168}
 169
 170static inline unsigned int crypto_skcipher_alg_max_keysize(
 171        struct skcipher_alg *alg)
 172{
 173        return alg->max_keysize;
 174}
 175
 176static inline unsigned int crypto_skcipher_alg_walksize(
 177        struct skcipher_alg *alg)
 178{
 179        return alg->walksize;
 180}
 181
 182/**
 183 * crypto_skcipher_walksize() - obtain walk size
 184 * @tfm: cipher handle
 185 *
 186 * In some cases, algorithms can only perform optimally when operating on
 187 * multiple blocks in parallel. This is reflected by the walksize, which
 188 * must be a multiple of the chunksize (or equal if the concern does not
 189 * apply)
 190 *
 191 * Return: walk size in bytes
 192 */
 193static inline unsigned int crypto_skcipher_walksize(
 194        struct crypto_skcipher *tfm)
 195{
 196        return crypto_skcipher_alg_walksize(crypto_skcipher_alg(tfm));
 197}
 198
 199/* Helpers for simple block cipher modes of operation */
 200struct skcipher_ctx_simple {
 201        struct crypto_cipher *cipher;   /* underlying block cipher */
 202};
 203static inline struct crypto_cipher *
 204skcipher_cipher_simple(struct crypto_skcipher *tfm)
 205{
 206        struct skcipher_ctx_simple *ctx = crypto_skcipher_ctx(tfm);
 207
 208        return ctx->cipher;
 209}
 210
 211struct skcipher_instance *skcipher_alloc_instance_simple(
 212        struct crypto_template *tmpl, struct rtattr **tb);
 213
 214static inline struct crypto_alg *skcipher_ialg_simple(
 215        struct skcipher_instance *inst)
 216{
 217        struct crypto_cipher_spawn *spawn = skcipher_instance_ctx(inst);
 218
 219        return crypto_spawn_cipher_alg(spawn);
 220}
 221
 222#endif  /* _CRYPTO_INTERNAL_SKCIPHER_H */
 223
 224
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