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