/* * Copyright (c) 2015-2016, Freescale Semiconductor, Inc. * Copyright 2016-2018 NXP * All rights reserved. * * SPDX-License-Identifier: BSD-3-Clause */ #ifndef _FSL_TRNG_DRIVER_H_ #define _FSL_TRNG_DRIVER_H_ #include "fsl_common.h" #if defined(FSL_FEATURE_SOC_TRNG_COUNT) && FSL_FEATURE_SOC_TRNG_COUNT /*! * @addtogroup trng * @{ */ /******************************************************************************* * Definitions *******************************************************************************/ /*! @name Driver version */ /*@{*/ /*! @brief TRNG driver version 2.0.3. * * Current version: 2.0.3 * * Change log: * - Version 2.0.3 * - update TRNG_Init to restart entropy generation * - Version 2.0.2 * - fix MISRA issues * - Version 2.0.1 * - add support for KL8x and KL28Z * - update default OSCDIV for K81 to divide by 2 */ #define FSL_TRNG_DRIVER_VERSION (MAKE_VERSION(2, 0, 3)) /*@}*/ /*! @brief TRNG sample mode. Used by trng_config_t. */ typedef enum _trng_sample_mode { kTRNG_SampleModeVonNeumann = 0U, /*!< Use von Neumann data in both Entropy shifter and Statistical Checker. */ kTRNG_SampleModeRaw = 1U, /*!< Use raw data into both Entropy shifter and Statistical Checker. */ kTRNG_SampleModeVonNeumannRaw = 2U /*!< Use von Neumann data in Entropy shifter. Use raw data into Statistical Checker. */ } trng_sample_mode_t; /*! @brief TRNG clock mode. Used by trng_config_t. */ typedef enum _trng_clock_mode { kTRNG_ClockModeRingOscillator = 0U, /*!< Ring oscillator is used to operate the TRNG (default). */ kTRNG_ClockModeSystem = 1U /*!< System clock is used to operate the TRNG. This is for test use only, and indeterminate results may occur. */ } trng_clock_mode_t; /*! @brief TRNG ring oscillator divide. Used by trng_config_t. */ typedef enum _trng_ring_osc_div { kTRNG_RingOscDiv0 = 0U, /*!< Ring oscillator with no divide */ kTRNG_RingOscDiv2 = 1U, /*!< Ring oscillator divided-by-2. */ kTRNG_RingOscDiv4 = 2U, /*!< Ring oscillator divided-by-4. */ kTRNG_RingOscDiv8 = 3U /*!< Ring oscillator divided-by-8. */ } trng_ring_osc_div_t; /*! @brief Data structure for definition of statistical check limits. Used by trng_config_t. */ typedef struct _trng_statistical_check_limit { uint32_t maximum; /*!< Maximum limit.*/ uint32_t minimum; /*!< Minimum limit.*/ } trng_statistical_check_limit_t; /*! * @brief Data structure for the TRNG initialization * * This structure initializes the TRNG by calling the TRNG_Init() function. * It contains all TRNG configurations. */ typedef struct _trng_user_config { bool lock; /*!< @brief Disable programmability of TRNG registers. */ trng_clock_mode_t clockMode; /*!< @brief Clock mode used to operate TRNG.*/ trng_ring_osc_div_t ringOscDiv; /*!< @brief Ring oscillator divide used by TRNG. */ trng_sample_mode_t sampleMode; /*!< @brief Sample mode of the TRNG ring oscillator. */ /* Seed Control*/ uint16_t entropyDelay; /*!< @brief Entropy Delay. Defines the length (in system clocks) of each Entropy sample taken. */ uint16_t sampleSize; /*!< @brief Sample Size. Defines the total number of Entropy samples that will be taken during Entropy generation. */ uint16_t sparseBitLimit; /*!< @brief Sparse Bit Limit which defines the maximum number of * consecutive samples that may be discarded before an error is generated. * This limit is used only for during von Neumann sampling (enabled by TRNG_HAL_SetSampleMode()). * Samples are discarded if two consecutive raw samples are both 0 or both 1. If * this discarding occurs for a long period of time, it indicates that there is * insufficient Entropy. */ /* Statistical Check Parameters.*/ uint8_t retryCount; /*!< @brief Retry count. It defines the number of times a statistical check may fails * during the TRNG Entropy Generation before generating an error. */ uint8_t longRunMaxLimit; /*!< @brief Largest allowable number of consecutive samples of all 1, or all 0, * that is allowed during the Entropy generation. */ trng_statistical_check_limit_t monobitLimit; /*!< @brief Maximum and minimum limits for statistical check of number of ones/zero detected during entropy generation. */ trng_statistical_check_limit_t runBit1Limit; /*!< @brief Maximum and minimum limits for statistical check of number of runs of length 1 detected during entropy generation. */ trng_statistical_check_limit_t runBit2Limit; /*!< @brief Maximum and minimum limits for statistical check of number of runs of length 2 detected during entropy generation. */ trng_statistical_check_limit_t runBit3Limit; /*!< @brief Maximum and minimum limits for statistical check of number of runs of length 3 detected during entropy generation. */ trng_statistical_check_limit_t runBit4Limit; /*!< @brief Maximum and minimum limits for statistical check of number of runs of length 4 detected during entropy generation. */ trng_statistical_check_limit_t runBit5Limit; /*!< @brief Maximum and minimum limits for statistical check of number of runs of length 5 detected during entropy generation. */ trng_statistical_check_limit_t runBit6PlusLimit; /*!< @brief Maximum and minimum limits for statistical check of number of runs of length 6 or more detected during entropy generation. */ trng_statistical_check_limit_t pokerLimit; /*!< @brief Maximum and minimum limits for statistical check of "Poker Test". */ trng_statistical_check_limit_t frequencyCountLimit; /*!< @brief Maximum and minimum limits for statistical check of entropy sample frequency count. */ } trng_config_t; /******************************************************************************* * API *******************************************************************************/ #if defined(__cplusplus) extern "C" { #endif /*! * @brief Initializes the user configuration structure to default values. * * This function initializes the configuration structure to default values. The default * values are as follows. * @code * user_config->lock = 0; * user_config->clockMode = kTRNG_ClockModeRingOscillator; * user_config->ringOscDiv = kTRNG_RingOscDiv0; Or to other kTRNG_RingOscDiv[2|8] depending on the platform. * user_config->sampleMode = kTRNG_SampleModeRaw; * user_config->entropyDelay = 3200; * user_config->sampleSize = 2500; * user_config->sparseBitLimit = TRNG_USER_CONFIG_DEFAULT_SPARSE_BIT_LIMIT; * user_config->retryCount = 63; * user_config->longRunMaxLimit = 34; * user_config->monobitLimit.maximum = 1384; * user_config->monobitLimit.minimum = 1116; * user_config->runBit1Limit.maximum = 405; * user_config->runBit1Limit.minimum = 227; * user_config->runBit2Limit.maximum = 220; * user_config->runBit2Limit.minimum = 98; * user_config->runBit3Limit.maximum = 125; * user_config->runBit3Limit.minimum = 37; * user_config->runBit4Limit.maximum = 75; * user_config->runBit4Limit.minimum = 11; * user_config->runBit5Limit.maximum = 47; * user_config->runBit5Limit.minimum = 1; * user_config->runBit6PlusLimit.maximum = 47; * user_config->runBit6PlusLimit.minimum = 1; * user_config->pokerLimit.maximum = 26912; * user_config->pokerLimit.minimum = 24445; * user_config->frequencyCountLimit.maximum = 25600; * user_config->frequencyCountLimit.minimum = 1600; * @endcode * * @param user_config User configuration structure. * @return If successful, returns the kStatus_TRNG_Success. Otherwise, it returns an error. */ status_t TRNG_GetDefaultConfig(trng_config_t *userConfig); /*! * @brief Initializes the TRNG. * * This function initializes the TRNG. * When called, the TRNG entropy generation starts immediately. * * @param base TRNG base address * @param userConfig Pointer to the initialization configuration structure. * @return If successful, returns the kStatus_TRNG_Success. Otherwise, it returns an error. */ status_t TRNG_Init(TRNG_Type *base, const trng_config_t *userConfig); /*! * @brief Shuts down the TRNG. * * This function shuts down the TRNG. * * @param base TRNG base address. */ void TRNG_Deinit(TRNG_Type *base); /*! * @brief Gets random data. * * This function gets random data from the TRNG. * * @param base TRNG base address. * @param data Pointer address used to store random data. * @param dataSize Size of the buffer pointed by the data parameter. * @return random data */ status_t TRNG_GetRandomData(TRNG_Type *base, void *data, size_t dataSize); #if defined(__cplusplus) } #endif /*! @}*/ #endif /* FSL_FEATURE_SOC_TRNG_COUNT */ #endif /*_FSL_TRNG_H_*/