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 #include <asm/kmap_types.h>
  29
  30 /* Crypto notification events. */
  31 enum {
  32         CRYPTO_MSG_ALG_REQUEST,
  33         CRYPTO_MSG_ALG_REGISTER,
  34         CRYPTO_MSG_ALG_UNREGISTER,
  35         CRYPTO_MSG_TMPL_REGISTER,
  36         CRYPTO_MSG_TMPL_UNREGISTER,
  37 };
  38
  39 struct crypto_instance;
  40 struct crypto_template;
  41
  42 struct crypto_larval {
  43         struct crypto_alg alg;
  44         struct crypto_alg *adult;
  45         struct completion completion;
  46         u32 mask;
  47 };
  48
  49 extern struct list_head crypto_alg_list;
  50 extern struct rw_semaphore crypto_alg_sem;
  51 extern struct blocking_notifier_head crypto_chain;
  52
  53 static inline enum km_type crypto_kmap_type(int out)
  54 {
  55         enum km_type type;
  56
  57         if (in_softirq())
  58                 type = out * (KM_SOFTIRQ1 - KM_SOFTIRQ0) + KM_SOFTIRQ0;
  59         else
  60                 type = out * (KM_USER1 - KM_USER0) + KM_USER0;
  61
  62         return type;
  63 }
  64
  65 static inline void *crypto_kmap(struct page *page, int out)
  66 {
  67         return kmap_atomic(page, crypto_kmap_type(out));
  68 }
  69
  70 static inline void crypto_kunmap(void *vaddr, int out)
  71 {
  72         kunmap_atomic(vaddr, crypto_kmap_type(out));
  73 }
  74
  75 static inline void crypto_yield(u32 flags)
  76 {
  77         if (flags & CRYPTO_TFM_REQ_MAY_SLEEP)
  78                 cond_resched();
  79 }
  80
  81 #ifdef CONFIG_PROC_FS
  82 void __init crypto_init_proc(void);
  83 void __exit crypto_exit_proc(void);
  84 #else
  85 static inline void crypto_init_proc(void)
  86 { }
  87 static inline void crypto_exit_proc(void)
  88 { }
  89 #endif
  90
  91 static inline unsigned int crypto_digest_ctxsize(struct crypto_alg *alg)
  92 {
  93         unsigned int len = alg->cra_ctxsize;
  94
  95         if (alg->cra_alignmask) {
  96                 len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1);
  97                 len += alg->cra_digest.dia_digestsize;
  98         }
  99
 100         return len;
 101 }
 102
 103 static inline unsigned int crypto_cipher_ctxsize(struct crypto_alg *alg)
 104 {
 105         return alg->cra_ctxsize;
 106 }
 107
 108 static inline unsigned int crypto_compress_ctxsize(struct crypto_alg *alg)
 109 {
 110         return alg->cra_ctxsize;
 111 }
 112
 113 struct crypto_alg *crypto_mod_get(struct crypto_alg *alg);
 114 struct crypto_alg *__crypto_alg_lookup(const char *name, u32 type, u32 mask);
 115 struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask);
 116
 117 int crypto_init_digest_ops(struct crypto_tfm *tfm);
 118 int crypto_init_cipher_ops(struct crypto_tfm *tfm);
 119 int crypto_init_compress_ops(struct crypto_tfm *tfm);
 120
 121 void crypto_exit_digest_ops(struct crypto_tfm *tfm);
 122 void crypto_exit_cipher_ops(struct crypto_tfm *tfm);
 123 void crypto_exit_compress_ops(struct crypto_tfm *tfm);
 124
 125 void crypto_larval_error(const char *name, u32 type, u32 mask);
 126
 127 void crypto_shoot_alg(struct crypto_alg *alg);
 128 struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type,
 129                                       u32 mask);
 130
 131 int crypto_register_instance(struct crypto_template *tmpl,
 132                              struct crypto_instance *inst);
 133
 134 int crypto_register_notifier(struct notifier_block *nb);
 135 int crypto_unregister_notifier(struct notifier_block *nb);
 136
 137 static inline void crypto_alg_put(struct crypto_alg *alg)
 138 {
 139         if (atomic_dec_and_test(&alg->cra_refcnt) && alg->cra_destroy)
 140                 alg->cra_destroy(alg);
 141 }
 142
 143 static inline int crypto_tmpl_get(struct crypto_template *tmpl)
 144 {
 145         return try_module_get(tmpl->module);
 146 }
 147
 148 static inline void crypto_tmpl_put(struct crypto_template *tmpl)
 149 {
 150         module_put(tmpl->module);
 151 }
 152
 153 static inline int crypto_is_larval(struct crypto_alg *alg)
 154 {
 155         return alg->cra_flags & CRYPTO_ALG_LARVAL;
 156 }
 157
 158 static inline int crypto_is_dead(struct crypto_alg *alg)
 159 {
 160         return alg->cra_flags & CRYPTO_ALG_DEAD;
 161 }
 162
 163 static inline int crypto_is_moribund(struct crypto_alg *alg)
 164 {
 165         return alg->cra_flags & (CRYPTO_ALG_DEAD | CRYPTO_ALG_DYING);
 166 }
 167
 168 static inline int crypto_notify(unsigned long val, void *v)
 169 {
 170         return blocking_notifier_call_chain(&crypto_chain, val, v);
 171 }
 172
 173 #endif  /* _CRYPTO_INTERNAL_H */
 174