mirror of https://github.com/ARMmbed/mbed-os.git
111 lines
3.8 KiB
C
111 lines
3.8 KiB
C
/*******************************************************************************
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* Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
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* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Except as contained in this notice, the name of Maxim Integrated
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* Products, Inc. shall not be used except as stated in the Maxim Integrated
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* Products, Inc. Branding Policy.
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*
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* The mere transfer of this software does not imply any licenses
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* of trade secrets, proprietary technology, copyrights, patents,
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* trademarks, maskwork rights, or any other form of intellectual
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* property whatsoever. Maxim Integrated Products, Inc. retains all
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* ownership rights.
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*
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* $Date: 2016-03-11 11:46:37 -0600 (Fri, 11 Mar 2016) $
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* $Revision: 21839 $
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*
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******************************************************************************/
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/**
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* @file prng.h
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* @brief Pseudo-random number generator(PRNG) driver header file.
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* @note The PRNG hardware does not produce true random numbers. The output
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* should be used as a seed to an approved random-number algorithm, per
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* a certifying authority such as NIST or PCI. The approved algorithm
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* will output random numbers which are cerfitied for use in encryption
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* and authentication algorithms.
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*/
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#ifndef _PRNG_H_
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#define _PRNG_H_
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/***** Includes *****/
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#include "prng_regs.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/***** Definitions *****/
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/***** Globals *****/
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/***** Function Prototypes *****/
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/**
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* @brief Initialize required clocks and enable PRNG module
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* @note Function will set divisors to /1 if they are found disabled.
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* Otherwise, it will not change the divisor.
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*/
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void PRNG_Init(void);
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/**
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* @brief Returns ready bit to indicates that the PRNG_GetSeed can be called without
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* being held off. Only needs to be called after POR.
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*
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* @return 0 - PRNG not ready, non-zero = PRNG ready to read
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*/
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__STATIC_INLINE uint16_t PRNG_Ready(void)
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{
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return (MXC_PRNG->user_entropy & MXC_F_PRNG_USER_ENTROPY_RND_NUM_READY);
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}
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/**
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* @brief Retrieve a seed value from the PRNG
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* @note The PRNG hardware does not produce true random numbers. The output
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* should be used as a seed to an approved random-number algorithm, per
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* a certifying authority such as NIST or PCI. The approved algorithm
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* will output random numbers which are cerfitied for use in encryption
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* and authentication algorithms.
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*
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* @return This function returns a 16-bit seed value
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*/
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__STATIC_INLINE uint16_t PRNG_GetSeed(void)
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{
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return MXC_PRNG->rnd_num;
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}
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/**
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* @brief Add user entropy to the PRNG entropy source
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*
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* @param entropy This value will be mixed into the PRNG entropy source
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*/
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__STATIC_INLINE void PRNG_AddUserEntropy(uint8_t entropy)
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{
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MXC_PRNG->user_entropy = (uint32_t)entropy;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* _PRNG_H_ */
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