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/*
* Copyright 2016-2019 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/*
* Licensed under the OpenSSL licenses, (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* https://www.openssl.org/source/license.html
* or in the file LICENSE in the source distribution.
*/
#ifndef OSSL_CRYPTO_RAND_H
# define OSSL_CRYPTO_RAND_H
# include <openssl/rand.h>
/* forward declaration */
typedef struct rand_pool_st RAND_POOL;
void rand_cleanup_int(void);
void rand_drbg_cleanup_int(void);
void drbg_delete_thread_state(void);
/* Hardware-based seeding functions. */
size_t rand_acquire_entropy_from_tsc(RAND_POOL *pool);
size_t rand_acquire_entropy_from_cpu(RAND_POOL *pool);
/* DRBG entropy callbacks. */
size_t rand_drbg_get_entropy(RAND_DRBG *drbg,
unsigned char **pout,
int entropy, size_t min_len, size_t max_len,
int prediction_resistance);
void rand_drbg_cleanup_entropy(RAND_DRBG *drbg,
unsigned char *out, size_t outlen);
size_t rand_drbg_get_nonce(RAND_DRBG *drbg,
unsigned char **pout,
int entropy, size_t min_len, size_t max_len);
void rand_drbg_cleanup_nonce(RAND_DRBG *drbg,
unsigned char *out, size_t outlen);
size_t rand_drbg_get_additional_data(RAND_POOL *pool, unsigned char **pout);
void rand_drbg_cleanup_additional_data(RAND_POOL *pool, unsigned char *out);
/*
* RAND_POOL functions
*/
RAND_POOL *rand_pool_new(int entropy_requested, int secure,
size_t min_len, size_t max_len);
RAND_POOL *rand_pool_attach(const unsigned char *buffer, size_t len,
size_t entropy);
void rand_pool_free(RAND_POOL *pool);
const unsigned char *rand_pool_buffer(RAND_POOL *pool);
unsigned char *rand_pool_detach(RAND_POOL *pool);
void rand_pool_reattach(RAND_POOL *pool, unsigned char *buffer);
size_t rand_pool_entropy(RAND_POOL *pool);
size_t rand_pool_length(RAND_POOL *pool);
size_t rand_pool_entropy_available(RAND_POOL *pool);
size_t rand_pool_entropy_needed(RAND_POOL *pool);
/* |entropy_factor| expresses how many bits of data contain 1 bit of entropy */
size_t rand_pool_bytes_needed(RAND_POOL *pool, unsigned int entropy_factor);
size_t rand_pool_bytes_remaining(RAND_POOL *pool);
int rand_pool_add(RAND_POOL *pool,
const unsigned char *buffer, size_t len, size_t entropy);
unsigned char *rand_pool_add_begin(RAND_POOL *pool, size_t len);
int rand_pool_add_end(RAND_POOL *pool, size_t len, size_t entropy);
/*
* Add random bytes to the pool to acquire requested amount of entropy
*
* This function is platform specific and tries to acquire the requested
* amount of entropy by polling platform specific entropy sources.
*
* If the function succeeds in acquiring at least |entropy_requested| bits
* of entropy, the total entropy count is returned. If it fails, it returns
* an entropy count of 0.
*/
size_t rand_pool_acquire_entropy(RAND_POOL *pool);
/*
* Add some application specific nonce data
*
* This function is platform specific and adds some application specific
* data to the nonce used for instantiating the drbg.
*
* This data currently consists of the process and thread id, and a high
* resolution timestamp. The data does not include an atomic counter,
* because that is added by the calling function rand_drbg_get_nonce().
*
* Returns 1 on success and 0 on failure.
*/
int rand_pool_add_nonce_data(RAND_POOL *pool);
/*
* Add some platform specific additional data
*
* This function is platform specific and adds some random noise to the
* additional data used for generating random bytes and for reseeding
* the drbg.
*
* Returns 1 on success and 0 on failure.
*/
int rand_pool_add_additional_data(RAND_POOL *pool);
/*
* Initialise the random pool reseeding sources.
*
* Returns 1 on success and 0 on failure.
*/
int rand_pool_init(void);
/*
* Finalise the random pool reseeding sources.
*/
void rand_pool_cleanup(void);
/*
* Control the random pool use of open file descriptors.
*/
void rand_pool_keep_random_devices_open(int keep);
#endif
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