include/crypto/algapi.h

   1 /*
   2  * Cryptographic API for algorithms (i.e., low-level API).
   3  *
   4  * Copyright (c) 2006 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 #ifndef _CRYPTO_ALGAPI_H
  13 #define _CRYPTO_ALGAPI_H
  14
  15 #include <linux/crypto.h>
  16
  17 struct module;
  18 struct seq_file;
  19
  20 struct crypto_type {
  21         unsigned int (*ctxsize)(struct crypto_alg *alg, u32 type, u32 mask);
  22         int (*init)(struct crypto_tfm *tfm, u32 type, u32 mask);
  23         void (*exit)(struct crypto_tfm *tfm);
  24         void (*show)(struct seq_file *m, struct crypto_alg *alg);
  25 };
  26
  27 struct crypto_instance {
  28         struct crypto_alg alg;
  29
  30         struct crypto_template *tmpl;
  31         struct hlist_node list;
  32
  33         void *__ctx[] CRYPTO_MINALIGN_ATTR;
  34 };
  35
  36 struct crypto_template {
  37         struct list_head list;
  38         struct hlist_head instances;
  39         struct module *module;
  40
  41         struct crypto_instance *(*alloc)(void *param, unsigned int len);
  42         void (*free)(struct crypto_instance *inst);
  43
  44         char name[CRYPTO_MAX_ALG_NAME];
  45 };
  46
  47 struct crypto_spawn {
  48         struct list_head list;
  49         struct crypto_alg *alg;
  50         struct crypto_instance *inst;
  51 };
  52
  53 struct scatter_walk {
  54         struct scatterlist *sg;
  55         unsigned int offset;
  56 };
  57
  58 struct blkcipher_walk {
  59         union {
  60                 struct {
  61                         struct page *page;
  62                         unsigned long offset;
  63                 } phys;
  64
  65                 struct {
  66                         u8 *page;
  67                         u8 *addr;
  68                 } virt;
  69         } src, dst;
  70
  71         struct scatter_walk in;
  72         unsigned int nbytes;
  73
  74         struct scatter_walk out;
  75         unsigned int total;
  76
  77         void *page;
  78         u8 *buffer;
  79         u8 *iv;
  80
  81         int flags;
  82 };
  83
  84 extern const struct crypto_type crypto_blkcipher_type;
  85 extern const struct crypto_type crypto_hash_type;
  86
  87 void crypto_mod_put(struct crypto_alg *alg);
  88
  89 int crypto_register_template(struct crypto_template *tmpl);
  90 void crypto_unregister_template(struct crypto_template *tmpl);
  91 struct crypto_template *crypto_lookup_template(const char *name);
  92
  93 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
  94                       struct crypto_instance *inst);
  95 void crypto_drop_spawn(struct crypto_spawn *spawn);
  96 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
  97                                     u32 mask);
  98
  99 struct crypto_alg *crypto_get_attr_alg(void *param, unsigned int len,
 100                                        u32 type, u32 mask);
 101 struct crypto_instance *crypto_alloc_instance(const char *name,
 102                                               struct crypto_alg *alg);
 103
 104 int blkcipher_walk_done(struct blkcipher_desc *desc,
 105                         struct blkcipher_walk *walk, int err);
 106 int blkcipher_walk_virt(struct blkcipher_desc *desc,
 107                         struct blkcipher_walk *walk);
 108 int blkcipher_walk_phys(struct blkcipher_desc *desc,
 109                         struct blkcipher_walk *walk);
 110
 111 static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm)
 112 {
 113         unsigned long addr = (unsigned long)crypto_tfm_ctx(tfm);
 114         unsigned long align = crypto_tfm_alg_alignmask(tfm);
 115
 116         if (align <= crypto_tfm_ctx_alignment())
 117                 align = 1;
 118         return (void *)ALIGN(addr, align);
 119 }
 120
 121 static inline void *crypto_instance_ctx(struct crypto_instance *inst)
 122 {
 123         return inst->__ctx;
 124 }
 125
 126 static inline void *crypto_blkcipher_ctx(struct crypto_blkcipher *tfm)
 127 {
 128         return crypto_tfm_ctx(&tfm->base);
 129 }
 130
 131 static inline void *crypto_blkcipher_ctx_aligned(struct crypto_blkcipher *tfm)
 132 {
 133         return crypto_tfm_ctx_aligned(&tfm->base);
 134 }
 135
 136 static inline struct crypto_cipher *crypto_spawn_cipher(
 137         struct crypto_spawn *spawn)
 138 {
 139         u32 type = CRYPTO_ALG_TYPE_CIPHER;
 140         u32 mask = CRYPTO_ALG_TYPE_MASK;
 141
 142         return __crypto_cipher_cast(crypto_spawn_tfm(spawn, type, mask));
 143 }
 144
 145 static inline struct cipher_alg *crypto_cipher_alg(struct crypto_cipher *tfm)
 146 {
 147         return &crypto_cipher_tfm(tfm)->__crt_alg->cra_cipher;
 148 }
 149
 150 static inline struct crypto_hash *crypto_spawn_hash(struct crypto_spawn *spawn)
 151 {
 152         u32 type = CRYPTO_ALG_TYPE_HASH;
 153         u32 mask = CRYPTO_ALG_TYPE_HASH_MASK;
 154
 155         return __crypto_hash_cast(crypto_spawn_tfm(spawn, type, mask));
 156 }
 157
 158 static inline void *crypto_hash_ctx_aligned(struct crypto_hash *tfm)
 159 {
 160         return crypto_tfm_ctx_aligned(&tfm->base);
 161 }
 162
 163 static inline void blkcipher_walk_init(struct blkcipher_walk *walk,
 164                                        struct scatterlist *dst,
 165                                        struct scatterlist *src,
 166                                        unsigned int nbytes)
 167 {
 168         walk->in.sg = src;
 169         walk->out.sg = dst;
 170         walk->total = nbytes;
 171 }
 172
 173 #endif  /* _CRYPTO_ALGAPI_H */
 174