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/* Copyright (C) 2018 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*!
* \file
*
* \addtogroup random
*
* \brief Pseudo-random number generating API.
*
* The module provides generating of pseudo-random numbers and buffers.
*
* Example:
*
* ~~~
*
* uint16_t transaction_id = dnssec_random_uint16_t();
*
* ~~~
*
* @{
*/
#pragma once
#include <stdint.h>
#include <libdnssec/binary.h>
/*!
* Fill a buffer with pseudo-random data.
*
* \param data Pointer to the output buffer.
* \param size Size of the output buffer.
*
* \return Error code, DNSEC_EOK if successful.
*/
int dnssec_random_buffer(uint8_t *data, size_t size);
/*!
* Fill a binary structure with random data.
*
* \param data Preallocated binary structure to be filled.
*
* \return Error code, DNSEC_EOK if successful.
*/
int dnssec_random_binary(dnssec_binary_t *data);
/*!
* Declare function dnssec_random_<type>().
*/
#define dnssec_register_random_type(type) \
static inline type dnssec_random_##type(void) { \
type value; \
dnssec_random_buffer((uint8_t *)&value, sizeof(value)); \
return value; \
}
/*!
* Generate pseudo-random 16-bit number.
*/
static inline uint16_t dnssec_random_uint16_t(void);
/*!
* Generate pseudo-random 32-bit number.
*/
static inline uint32_t dnssec_random_uint32_t(void);
/*! \cond */
dnssec_register_random_type(uint16_t);
dnssec_register_random_type(uint32_t);
/*! \endcond */
/*! @} */
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