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(struct crypto_tfm *tfm)
  71 {
  72         if (tfm->crt_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         return alg->cra_ctxsize;
 103 }
 104
 105 static inline unsigned int crypto_cipher_ctxsize(struct crypto_alg *alg,
 106                                                  int flags)
 107 {
 108         unsigned int len = alg->cra_ctxsize;
 109
 110         switch (flags & CRYPTO_TFM_MODE_MASK) {
 111         case CRYPTO_TFM_MODE_CBC:
 112                 len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1);
 113                 len += alg->cra_blocksize;
 114                 break;
 115         }
 116
 117         return len;
 118 }
 119
 120 static inline unsigned int crypto_compress_ctxsize(struct crypto_alg *alg,
 121                                                    int flags)
 122 {
 123         return alg->cra_ctxsize;
 124 }
 125
 126 struct crypto_alg *crypto_mod_get(struct crypto_alg *alg);
 127 void crypto_mod_put(struct crypto_alg *alg);
 128 struct crypto_alg *__crypto_alg_lookup(const char *name, u32 type, u32 mask);
 129 struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask);
 130
 131 int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags);
 132 int crypto_init_cipher_flags(struct crypto_tfm *tfm, u32 flags);
 133 int crypto_init_compress_flags(struct crypto_tfm *tfm, u32 flags);
 134
 135 int crypto_init_digest_ops(struct crypto_tfm *tfm);
 136 int crypto_init_cipher_ops(struct crypto_tfm *tfm);
 137 int crypto_init_compress_ops(struct crypto_tfm *tfm);
 138
 139 void crypto_exit_digest_ops(struct crypto_tfm *tfm);
 140 void crypto_exit_cipher_ops(struct crypto_tfm *tfm);
 141 void crypto_exit_compress_ops(struct crypto_tfm *tfm);
 142
 143 void crypto_larval_error(const char *name, u32 type, u32 mask);
 144
 145 int crypto_register_instance(struct crypto_template *tmpl,
 146                              struct crypto_instance *inst);
 147
 148 int crypto_register_notifier(struct notifier_block *nb);
 149 int crypto_unregister_notifier(struct notifier_block *nb);
 150
 151 static inline int crypto_tmpl_get(struct crypto_template *tmpl)
 152 {
 153         return try_module_get(tmpl->module);
 154 }
 155
 156 static inline void crypto_tmpl_put(struct crypto_template *tmpl)
 157 {
 158         module_put(tmpl->module);
 159 }
 160
 161 static inline int crypto_is_larval(struct crypto_alg *alg)
 162 {
 163         return alg->cra_flags & CRYPTO_ALG_LARVAL;
 164 }
 165
 166 static inline int crypto_notify(unsigned long val, void *v)
 167 {
 168         return blocking_notifier_call_chain(&crypto_chain, val, v);
 169 }
 170
 171 #endif  /* _CRYPTO_INTERNAL_H */
 172