2 * Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (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 Apache License 2.0 (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);
29 /* Hardware-based seeding functions. */
30 size_t rand_acquire_entropy_from_tsc(RAND_POOL *pool);
31 size_t rand_acquire_entropy_from_cpu(RAND_POOL *pool);
33 /* DRBG entropy callbacks. */
34 size_t rand_drbg_get_entropy(RAND_DRBG *drbg,
36 int entropy, size_t min_len, size_t max_len,
37 int prediction_resistance);
38 void rand_drbg_cleanup_entropy(RAND_DRBG *drbg,
39 unsigned char *out, size_t outlen);
40 size_t rand_drbg_get_nonce(RAND_DRBG *drbg,
42 int entropy, size_t min_len, size_t max_len);
43 void rand_drbg_cleanup_nonce(RAND_DRBG *drbg,
44 unsigned char *out, size_t outlen);
46 size_t rand_drbg_get_additional_data(RAND_POOL *pool, unsigned char **pout);
48 void rand_drbg_cleanup_additional_data(RAND_POOL *pool, unsigned char *out);
50 /* CRNG test entropy filter callbacks. */
51 size_t rand_crngt_get_entropy(RAND_DRBG *drbg,
53 int entropy, size_t min_len, size_t max_len,
54 int prediction_resistance);
55 void rand_crngt_cleanup_entropy(RAND_DRBG *drbg,
56 unsigned char *out, size_t outlen);
61 RAND_POOL *rand_pool_new(int entropy_requested, int secure,
62 size_t min_len, size_t max_len);
63 RAND_POOL *rand_pool_attach(const unsigned char *buffer, size_t len,
65 void rand_pool_free(RAND_POOL *pool);
67 const unsigned char *rand_pool_buffer(RAND_POOL *pool);
68 unsigned char *rand_pool_detach(RAND_POOL *pool);
69 void rand_pool_reattach(RAND_POOL *pool, unsigned char *buffer);
71 size_t rand_pool_entropy(RAND_POOL *pool);
72 size_t rand_pool_length(RAND_POOL *pool);
74 size_t rand_pool_entropy_available(RAND_POOL *pool);
75 size_t rand_pool_entropy_needed(RAND_POOL *pool);
76 /* |entropy_factor| expresses how many bits of data contain 1 bit of entropy */
77 size_t rand_pool_bytes_needed(RAND_POOL *pool, unsigned int entropy_factor);
78 size_t rand_pool_bytes_remaining(RAND_POOL *pool);
80 int rand_pool_add(RAND_POOL *pool,
81 const unsigned char *buffer, size_t len, size_t entropy);
82 unsigned char *rand_pool_add_begin(RAND_POOL *pool, size_t len);
83 int rand_pool_add_end(RAND_POOL *pool, size_t len, size_t entropy);
87 * Add random bytes to the pool to acquire requested amount of entropy
89 * This function is platform specific and tries to acquire the requested
90 * amount of entropy by polling platform specific entropy sources.
92 * If the function succeeds in acquiring at least |entropy_requested| bits
93 * of entropy, the total entropy count is returned. If it fails, it returns
94 * an entropy count of 0.
96 size_t rand_pool_acquire_entropy(RAND_POOL *pool);
99 * Add some application specific nonce data
101 * This function is platform specific and adds some application specific
102 * data to the nonce used for instantiating the drbg.
104 * This data currently consists of the process and thread id, and a high
105 * resolution timestamp. The data does not include an atomic counter,
106 * because that is added by the calling function rand_drbg_get_nonce().
108 * Returns 1 on success and 0 on failure.
110 int rand_pool_add_nonce_data(RAND_POOL *pool);
114 * Add some platform specific additional data
116 * This function is platform specific and adds some random noise to the
117 * additional data used for generating random bytes and for reseeding
120 * Returns 1 on success and 0 on failure.
122 int rand_pool_add_additional_data(RAND_POOL *pool);
125 * Initialise the random pool reseeding sources.
127 * Returns 1 on success and 0 on failure.
129 int rand_pool_init(void);
132 * Finalise the random pool reseeding sources.
134 void rand_pool_cleanup(void);
137 * Control the random pool use of open file descriptors.
139 void rand_pool_keep_random_devices_open(int keep);
141 /* Equivalent of RAND_priv_bytes() but additionally taking an OPENSSL_CTX */
142 int rand_priv_bytes_ex(OPENSSL_CTX *ctx, unsigned char *buf, int num);
144 /* Equivalent of RAND_bytes() but additionally taking an OPENSSL_CTX */
145 int rand_bytes_ex(OPENSSL_CTX *ctx, unsigned char *buf, int num);