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 /* Crypto notification events. */
  30 enum {
  31         CRYPTO_MSG_ALG_REQUEST,
  32         CRYPTO_MSG_ALG_REGISTER,
  33         CRYPTO_MSG_ALG_UNREGISTER,
  34         CRYPTO_MSG_TMPL_REGISTER,
  35         CRYPTO_MSG_TMPL_UNREGISTER,
  36 };
  37
  38 struct crypto_instance;
  39 struct crypto_template;
  40
  41 struct crypto_larval {
  42         struct crypto_alg alg;
  43         struct crypto_alg *adult;
  44         struct completion completion;
  45         u32 mask;
  46 };
  47
  48 extern struct list_head crypto_alg_list;
  49 extern struct rw_semaphore crypto_alg_sem;
  50 extern struct blocking_notifier_head crypto_chain;
  51
  52 #ifdef CONFIG_PROC_FS
  53 void __init crypto_init_proc(void);
  54 void __exit crypto_exit_proc(void);
  55 #else
  56 static inline void crypto_init_proc(void)
  57 { }
  58 static inline void crypto_exit_proc(void)
  59 { }
  60 #endif
  61
  62 static inline unsigned int crypto_digest_ctxsize(struct crypto_alg *alg)
  63 {
  64         unsigned int len = alg->cra_ctxsize;
  65
  66         if (alg->cra_alignmask) {
  67                 len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1);
  68                 len += alg->cra_digest.dia_digestsize;
  69         }
  70
  71         return len;
  72 }
  73
  74 static inline unsigned int crypto_cipher_ctxsize(struct crypto_alg *alg)
  75 {
  76         return alg->cra_ctxsize;
  77 }
  78
  79 static inline unsigned int crypto_compress_ctxsize(struct crypto_alg *alg)
  80 {
  81         return alg->cra_ctxsize;
  82 }
  83
  84 struct crypto_alg *crypto_mod_get(struct crypto_alg *alg);
  85 struct crypto_alg *__crypto_alg_lookup(const char *name, u32 type, u32 mask);
  86 struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask);
  87
  88 int crypto_init_digest_ops(struct crypto_tfm *tfm);
  89 int crypto_init_digest_ops_async(struct crypto_tfm *tfm);
  90 int crypto_init_cipher_ops(struct crypto_tfm *tfm);
  91 int crypto_init_compress_ops(struct crypto_tfm *tfm);
  92
  93 void crypto_exit_digest_ops(struct crypto_tfm *tfm);
  94 void crypto_exit_cipher_ops(struct crypto_tfm *tfm);
  95 void crypto_exit_compress_ops(struct crypto_tfm *tfm);
  96
  97 void crypto_larval_kill(struct crypto_alg *alg);
  98 struct crypto_alg *crypto_larval_lookup(const char *name, u32 type, u32 mask);
  99 void crypto_larval_error(const char *name, u32 type, u32 mask);
 100
 101 void crypto_shoot_alg(struct crypto_alg *alg);
 102 struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type,
 103                                       u32 mask);
 104
 105 int crypto_register_instance(struct crypto_template *tmpl,
 106                              struct crypto_instance *inst);
 107
 108 int crypto_register_notifier(struct notifier_block *nb);
 109 int crypto_unregister_notifier(struct notifier_block *nb);
 110
 111 static inline void crypto_alg_put(struct crypto_alg *alg)
 112 {
 113         if (atomic_dec_and_test(&alg->cra_refcnt) && alg->cra_destroy)
 114                 alg->cra_destroy(alg);
 115 }
 116
 117 static inline int crypto_tmpl_get(struct crypto_template *tmpl)
 118 {
 119         return try_module_get(tmpl->module);
 120 }
 121
 122 static inline void crypto_tmpl_put(struct crypto_template *tmpl)
 123 {
 124         module_put(tmpl->module);
 125 }
 126
 127 static inline int crypto_is_larval(struct crypto_alg *alg)
 128 {
 129         return alg->cra_flags & CRYPTO_ALG_LARVAL;
 130 }
 131
 132 static inline int crypto_is_dead(struct crypto_alg *alg)
 133 {
 134         return alg->cra_flags & CRYPTO_ALG_DEAD;
 135 }
 136
 137 static inline int crypto_is_moribund(struct crypto_alg *alg)
 138 {
 139         return alg->cra_flags & (CRYPTO_ALG_DEAD | CRYPTO_ALG_DYING);
 140 }
 141
 142 static inline int crypto_notify(unsigned long val, void *v)
 143 {
 144         return blocking_notifier_call_chain(&crypto_chain, val, v);
 145 }
 146
 147 #endif  /* _CRYPTO_INTERNAL_H */
 148