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/mm.h>
  18 #include <linux/highmem.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/init.h>
  21 #include <linux/list.h>
  22 #include <linux/module.h>
  23 #include <linux/kernel.h>
  24 #include <linux/rwsem.h>
  25 #include <linux/slab.h>
  26 #include <asm/kmap_types.h>
  27
  28 struct crypto_instance;
  29 struct crypto_template;
  30
  31 extern struct list_head crypto_alg_list;
  32 extern struct rw_semaphore crypto_alg_sem;
  33
  34 extern enum km_type crypto_km_types[];
  35
  36 static inline enum km_type crypto_kmap_type(int out)
  37 {
  38         return crypto_km_types[(in_softirq() ? 2 : 0) + out];
  39 }
  40
  41 static inline void *crypto_kmap(struct page *page, int out)
  42 {
  43         return kmap_atomic(page, crypto_kmap_type(out));
  44 }
  45
  46 static inline void crypto_kunmap(void *vaddr, int out)
  47 {
  48         kunmap_atomic(vaddr, crypto_kmap_type(out));
  49 }
  50
  51 static inline void crypto_yield(struct crypto_tfm *tfm)
  52 {
  53         if (tfm->crt_flags & CRYPTO_TFM_REQ_MAY_SLEEP)
  54                 cond_resched();
  55 }
  56
  57 #ifdef CONFIG_CRYPTO_HMAC
  58 int crypto_alloc_hmac_block(struct crypto_tfm *tfm);
  59 void crypto_free_hmac_block(struct crypto_tfm *tfm);
  60 #else
  61 static inline int crypto_alloc_hmac_block(struct crypto_tfm *tfm)
  62 {
  63         return 0;
  64 }
  65
  66 static inline void crypto_free_hmac_block(struct crypto_tfm *tfm)
  67 { }
  68 #endif
  69
  70 #ifdef CONFIG_PROC_FS
  71 void __init crypto_init_proc(void);
  72 void __exit crypto_exit_proc(void);
  73 #else
  74 static inline void crypto_init_proc(void)
  75 { }
  76 static inline void crypto_exit_proc(void)
  77 { }
  78 #endif
  79
  80 static inline unsigned int crypto_digest_ctxsize(struct crypto_alg *alg,
  81                                                  int flags)
  82 {
  83         return alg->cra_ctxsize;
  84 }
  85
  86 static inline unsigned int crypto_cipher_ctxsize(struct crypto_alg *alg,
  87                                                  int flags)
  88 {
  89         unsigned int len = alg->cra_ctxsize;
  90
  91         switch (flags & CRYPTO_TFM_MODE_MASK) {
  92         case CRYPTO_TFM_MODE_CBC:
  93                 len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1);
  94                 len += alg->cra_blocksize;
  95                 break;
  96         }
  97
  98         return len;
  99 }
 100
 101 static inline unsigned int crypto_compress_ctxsize(struct crypto_alg *alg,
 102                                                    int flags)
 103 {
 104         return alg->cra_ctxsize;
 105 }
 106
 107 int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags);
 108 int crypto_init_cipher_flags(struct crypto_tfm *tfm, u32 flags);
 109 int crypto_init_compress_flags(struct crypto_tfm *tfm, u32 flags);
 110
 111 int crypto_init_digest_ops(struct crypto_tfm *tfm);
 112 int crypto_init_cipher_ops(struct crypto_tfm *tfm);
 113 int crypto_init_compress_ops(struct crypto_tfm *tfm);
 114
 115 void crypto_exit_digest_ops(struct crypto_tfm *tfm);
 116 void crypto_exit_cipher_ops(struct crypto_tfm *tfm);
 117 void crypto_exit_compress_ops(struct crypto_tfm *tfm);
 118
 119 int crypto_register_instance(struct crypto_template *tmpl,
 120                              struct crypto_instance *inst);
 121
 122 static inline int crypto_tmpl_get(struct crypto_template *tmpl)
 123 {
 124         return try_module_get(tmpl->module);
 125 }
 126
 127 static inline void crypto_tmpl_put(struct crypto_template *tmpl)
 128 {
 129         module_put(tmpl->module);
 130 }
 131
 132 #endif  /* _CRYPTO_INTERNAL_H */
 133