2 * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
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
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.
18 #ifndef HEADER_RAND_INT_H
19 # define HEADER_RAND_INT_H
21 # include <openssl/rand.h>
23 /* forward declaration */
24 typedef struct rand_pool_st RAND_POOL;
26 void rand_cleanup_int(void);
27 void rand_drbg_cleanup_int(void);
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);
34 /* DRBG entropy callbacks. */
35 size_t rand_drbg_get_entropy(RAND_DRBG *drbg,
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);
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);
50 const unsigned char *rand_pool_buffer(RAND_POOL *pool);
51 unsigned char *rand_pool_detach(RAND_POOL *pool);
53 size_t rand_pool_entropy(RAND_POOL *pool);
54 size_t rand_pool_length(RAND_POOL *pool);
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);
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);
68 * Add random bytes to the pool to acquire requested amount of entropy
70 * This function is platform specific and tries to acquire the requested
71 * amount of entropy by polling platform specific entropy sources.
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.
77 size_t rand_pool_acquire_entropy(RAND_POOL *pool);