crypto/internal.h

   1 /*
   2  * Cryptographic API.
   3  *
   4  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
   5  * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the Free
   9  * Software Foundation; either version 2 of the License, or (at your option)
  10  * any later version.
  11  *
  12  */
  13 #ifndef _CRYPTO_INTERNAL_H
  14 #define _CRYPTO_INTERNAL_H
  15
  16 #include <crypto/algapi.h>
  17 #include <linux/completion.h>
  18 #include <linux/mm.h>
  19 #include <linux/highmem.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/init.h>
  22 #include <linux/list.h>
  23 #include <linux/module.h>
  24 #include <linux/kernel.h>
  25 #include <linux/notifier.h>
  26 #include <linux/rwsem.h>
  27 #include <linux/slab.h>
  28
  29 #ifdef CONFIG_CRYPTO_FIPS
  30 extern int fips_enabled;
  31 #else
  32 #define fips_enabled 0
  33 #endif
  34
  35 /* Crypto notification events. */
  36 enum {
  37         CRYPTO_MSG_ALG_REQUEST,
  38         CRYPTO_MSG_ALG_REGISTER,
  39         CRYPTO_MSG_ALG_UNREGISTER,
  40         CRYPTO_MSG_TMPL_REGISTER,
  41         CRYPTO_MSG_TMPL_UNREGISTER,
  42 };
  43
  44 struct crypto_instance;
  45 struct crypto_template;
  46
  47 struct crypto_larval {
  48         struct crypto_alg alg;
  49         struct crypto_alg *adult;
  50         struct completion completion;
  51         u32 mask;
  52 };
  53
  54 extern struct list_head crypto_alg_list;
  55 extern struct rw_semaphore crypto_alg_sem;
  56 extern struct blocking_notifier_head crypto_chain;
  57
  58 #ifdef CONFIG_PROC_FS
  59 void __init crypto_init_proc(void);
  60 void __exit crypto_exit_proc(void);
  61 #else
  62 static inline void crypto_init_proc(void)
  63 { }
  64 static inline void crypto_exit_proc(void)
  65 { }
  66 #endif
  67
  68 static inline unsigned int crypto_digest_ctxsize(struct crypto_alg *alg)
  69 {
  70         unsigned int len = alg->cra_ctxsize;
  71
  72         if (alg->cra_alignmask) {
  73                 len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1);
  74                 len += alg->cra_digest.dia_digestsize;
  75         }
  76
  77         return len;
  78 }
  79
  80 static inline unsigned int crypto_cipher_ctxsize(struct crypto_alg *alg)
  81 {
  82         return alg->cra_ctxsize;
  83 }
  84
  85 static inline unsigned int crypto_compress_ctxsize(struct crypto_alg *alg)
  86 {
  87         return alg->cra_ctxsize;
  88 }
  89
  90 struct crypto_alg *crypto_mod_get(struct crypto_alg *alg);
  91 struct crypto_alg *crypto_alg_lookup(const char *name, u32 type, u32 mask);
  92 struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask);
  93
  94 int crypto_init_digest_ops(struct crypto_tfm *tfm);
  95 int crypto_init_digest_ops_async(struct crypto_tfm *tfm);
  96 int crypto_init_cipher_ops(struct crypto_tfm *tfm);
  97 int crypto_init_compress_ops(struct crypto_tfm *tfm);
  98
  99 void crypto_exit_digest_ops(struct crypto_tfm *tfm);
 100 void crypto_exit_cipher_ops(struct crypto_tfm *tfm);
 101 void crypto_exit_compress_ops(struct crypto_tfm *tfm);
 102
 103 struct crypto_larval *crypto_larval_alloc(const char *name, u32 type, u32 mask);
 104 void crypto_larval_kill(struct crypto_alg *alg);
 105 struct crypto_alg *crypto_larval_lookup(const char *name, u32 type, u32 mask);
 106 void crypto_larval_error(const char *name, u32 type, u32 mask);
 107 void crypto_alg_tested(const char *name, int err);
 108
 109 void crypto_shoot_alg(struct crypto_alg *alg);
 110 struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type,
 111                                       u32 mask);
 112 void *crypto_create_tfm(struct crypto_alg *alg,
 113                         const struct crypto_type *frontend);
 114 void *crypto_alloc_tfm(const char *alg_name,
 115                        const struct crypto_type *frontend, u32 type, u32 mask);
 116
 117 int crypto_register_instance(struct crypto_template *tmpl,
 118                              struct crypto_instance *inst);
 119
 120 int crypto_register_notifier(struct notifier_block *nb);
 121 int crypto_unregister_notifier(struct notifier_block *nb);
 122 int crypto_probing_notify(unsigned long val, void *v);
 123
 124 static inline void crypto_alg_put(struct crypto_alg *alg)
 125 {
 126         if (atomic_dec_and_test(&alg->cra_refcnt) && alg->cra_destroy)
 127                 alg->cra_destroy(alg);
 128 }
 129
 130 static inline int crypto_tmpl_get(struct crypto_template *tmpl)
 131 {
 132         return try_module_get(tmpl->module);
 133 }
 134
 135 static inline void crypto_tmpl_put(struct crypto_template *tmpl)
 136 {
 137         module_put(tmpl->module);
 138 }
 139
 140 static inline int crypto_is_larval(struct crypto_alg *alg)
 141 {
 142         return alg->cra_flags & CRYPTO_ALG_LARVAL;
 143 }
 144
 145 static inline int crypto_is_dead(struct crypto_alg *alg)
 146 {
 147         return alg->cra_flags & CRYPTO_ALG_DEAD;
 148 }
 149
 150 static inline int crypto_is_moribund(struct crypto_alg *alg)
 151 {
 152         return alg->cra_flags & (CRYPTO_ALG_DEAD | CRYPTO_ALG_DYING);
 153 }
 154
 155 static inline void crypto_notify(unsigned long val, void *v)
 156 {
 157         blocking_notifier_call_chain(&crypto_chain, val, v);
 158 }
 159
 160 #endif  /* _CRYPTO_INTERNAL_H */
 161