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 extern enum km_type crypto_km_types[];
  54
  55 static inline enum km_type crypto_kmap_type(int out)
  56 {
  57         return crypto_km_types[(in_softirq() ? 2 : 0) + out];
  58 }
  59
  60 static inline void *crypto_kmap(struct page *page, int out)
  61 {
  62         return kmap_atomic(page, crypto_kmap_type(out));
  63 }
  64
  65 static inline void crypto_kunmap(void *vaddr, int out)
  66 {
  67         kunmap_atomic(vaddr, crypto_kmap_type(out));
  68 }
  69
  70 static inline void crypto_yield(u32 flags)
  71 {
  72         if (flags & CRYPTO_TFM_REQ_MAY_SLEEP)
  73                 cond_resched();
  74 }
  75
  76 #ifdef CONFIG_CRYPTO_HMAC
  77 int crypto_alloc_hmac_block(struct crypto_tfm *tfm);
  78 void crypto_free_hmac_block(struct crypto_tfm *tfm);
  79 #else
  80 static inline int crypto_alloc_hmac_block(struct crypto_tfm *tfm)
  81 {
  82         return 0;
  83 }
  84
  85 static inline void crypto_free_hmac_block(struct crypto_tfm *tfm)
  86 { }
  87 #endif
  88
  89 #ifdef CONFIG_PROC_FS
  90 void __init crypto_init_proc(void);
  91 void __exit crypto_exit_proc(void);
  92 #else
  93 static inline void crypto_init_proc(void)
  94 { }
  95 static inline void crypto_exit_proc(void)
  96 { }
  97 #endif
  98
  99 static inline unsigned int crypto_digest_ctxsize(struct crypto_alg *alg,
 100                                                  int flags)
 101 {
 102         unsigned int len = alg->cra_ctxsize;
 103
 104         if (alg->cra_alignmask) {
 105                 len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1);
 106                 len += alg->cra_digest.dia_digestsize;
 107         }
 108
 109         return len;
 110 }
 111
 112 static inline unsigned int crypto_cipher_ctxsize(struct crypto_alg *alg,
 113                                                  int flags)
 114 {
 115         unsigned int len = alg->cra_ctxsize;
 116
 117         switch (flags & CRYPTO_TFM_MODE_MASK) {
 118         case CRYPTO_TFM_MODE_CBC:
 119                 len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1);
 120                 len += alg->cra_blocksize;
 121                 break;
 122         }
 123
 124         return len;
 125 }
 126
 127 static inline unsigned int crypto_compress_ctxsize(struct crypto_alg *alg,
 128                                                    int flags)
 129 {
 130         return alg->cra_ctxsize;
 131 }
 132
 133 struct crypto_alg *crypto_mod_get(struct crypto_alg *alg);
 134 void crypto_mod_put(struct crypto_alg *alg);
 135 struct crypto_alg *__crypto_alg_lookup(const char *name, u32 type, u32 mask);
 136 struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask);
 137
 138 int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags);
 139 int crypto_init_cipher_flags(struct crypto_tfm *tfm, u32 flags);
 140 int crypto_init_compress_flags(struct crypto_tfm *tfm, u32 flags);
 141
 142 int crypto_init_digest_ops(struct crypto_tfm *tfm);
 143 int crypto_init_cipher_ops(struct crypto_tfm *tfm);
 144 int crypto_init_compress_ops(struct crypto_tfm *tfm);
 145
 146 void crypto_exit_digest_ops(struct crypto_tfm *tfm);
 147 void crypto_exit_cipher_ops(struct crypto_tfm *tfm);
 148 void crypto_exit_compress_ops(struct crypto_tfm *tfm);
 149
 150 void crypto_larval_error(const char *name, u32 type, u32 mask);
 151
 152 void crypto_shoot_alg(struct crypto_alg *alg);
 153 struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 flags);
 154
 155 int crypto_register_instance(struct crypto_template *tmpl,
 156                              struct crypto_instance *inst);
 157
 158 int crypto_register_notifier(struct notifier_block *nb);
 159 int crypto_unregister_notifier(struct notifier_block *nb);
 160
 161 static inline void crypto_alg_put(struct crypto_alg *alg)
 162 {
 163         if (atomic_dec_and_test(&alg->cra_refcnt) && alg->cra_destroy)
 164                 alg->cra_destroy(alg);
 165 }
 166
 167 static inline int crypto_tmpl_get(struct crypto_template *tmpl)
 168 {
 169         return try_module_get(tmpl->module);
 170 }
 171
 172 static inline void crypto_tmpl_put(struct crypto_template *tmpl)
 173 {
 174         module_put(tmpl->module);
 175 }
 176
 177 static inline int crypto_is_larval(struct crypto_alg *alg)
 178 {
 179         return alg->cra_flags & CRYPTO_ALG_LARVAL;
 180 }
 181
 182 static inline int crypto_is_dead(struct crypto_alg *alg)
 183 {
 184         return alg->cra_flags & CRYPTO_ALG_DEAD;
 185 }
 186
 187 static inline int crypto_is_moribund(struct crypto_alg *alg)
 188 {
 189         return alg->cra_flags & (CRYPTO_ALG_DEAD | CRYPTO_ALG_DYING);
 190 }
 191
 192 static inline int crypto_notify(unsigned long val, void *v)
 193 {
 194         return blocking_notifier_call_chain(&crypto_chain, val, v);
 195 }
 196
 197 #endif  /* _CRYPTO_INTERNAL_H */
 198