crypto/include/internal/rand_int.h

   1 /*
   2  * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 /*
  11  * Licensed under the OpenSSL licenses, (the "License");
  12  * you may not use this file except in compliance with the License.
  13  * You may obtain a copy of the License at
  14  * https://www.openssl.org/source/license.html
  15  * or in the file LICENSE in the source distribution.
  16  */
  17
  18 #ifndef HEADER_RAND_INT_H
  19 # define HEADER_RAND_INT_H
  20
  21 # include <openssl/rand.h>
  22
  23 /* forward declaration */
  24 typedef struct rand_pool_st RAND_POOL;
  25
  26 void rand_cleanup_int(void);
  27 void rand_drbg_cleanup_int(void);
  28 void rand_fork(void);
  29
  30 /* Hardware-based seeding functions. */
  31 size_t rand_acquire_entropy_from_tsc(RAND_POOL *pool);
  32 size_t rand_acquire_entropy_from_cpu(RAND_POOL *pool);
  33
  34 /* DRBG entropy callbacks. */
  35 size_t rand_drbg_get_entropy(RAND_DRBG *drbg,
  36                              unsigned char **pout,
  37                              int entropy, size_t min_len, size_t max_len,
  38                              int prediction_resistance);
  39 void rand_drbg_cleanup_entropy(RAND_DRBG *drbg,
  40                                unsigned char *out, size_t outlen);
  41 size_t rand_drbg_get_additional_data(unsigned char **pout, size_t max_len);
  42
  43
  44 /*
  45  * RAND_POOL functions
  46  */
  47 RAND_POOL *rand_pool_new(int entropy_requested, size_t min_len, size_t max_len);
  48 void rand_pool_free(RAND_POOL *pool);
  49
  50 const unsigned char *rand_pool_buffer(RAND_POOL *pool);
  51 unsigned char *rand_pool_detach(RAND_POOL *pool);
  52
  53 size_t rand_pool_entropy(RAND_POOL *pool);
  54 size_t rand_pool_length(RAND_POOL *pool);
  55
  56 size_t rand_pool_entropy_available(RAND_POOL *pool);
  57 size_t rand_pool_entropy_needed(RAND_POOL *pool);
  58 size_t rand_pool_bytes_needed(RAND_POOL *pool, unsigned int entropy_per_byte);
  59 size_t rand_pool_bytes_remaining(RAND_POOL *pool);
  60
  61 size_t rand_pool_add(RAND_POOL *pool,
  62                      const unsigned char *buffer, size_t len, size_t entropy);
  63 unsigned char *rand_pool_add_begin(RAND_POOL *pool, size_t len);
  64 size_t rand_pool_add_end(RAND_POOL *pool, size_t len, size_t entropy);
  65
  66
  67 /*
  68  * Add random bytes to the pool to acquire requested amount of entropy
  69  *
  70  * This function is platform specific and tries to acquire the requested
  71  * amount of entropy by polling platform specific entropy sources.
  72  *
  73  * If the function succeeds in acquiring at least |entropy_requested| bits
  74  * of entropy, the total entropy count is returned. If it fails, it returns
  75  * an entropy count of 0.
  76  */
  77 size_t rand_pool_acquire_entropy(RAND_POOL *pool);
  78
  79 #endif