/***************************************************************************//** * \file cy_crypto_core_prng_v1.c * \version 2.40 * * \brief * This file provides the source code to the API for the PRNG * in the Crypto block driver. * ******************************************************************************** * Copyright 2016-2020 Cypress Semiconductor Corporation * SPDX-License-Identifier: Apache-2.0 * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. *******************************************************************************/ #include "cy_device.h" #if defined (CY_IP_MXCRYPTO) #include "cy_crypto_core_prng_v1.h" #if defined(__cplusplus) extern "C" { #endif #if (CPUSS_CRYPTO_PR == 1) #include "cy_crypto_core_hw_v1.h" #include "cy_syslib.h" /******************************************************************************* * Function Name: Cy_Crypto_Core_V1_Prng_Init ****************************************************************************//** * * Initializes the PRND parameters. * Invoking this function causes a restart of the pseudo-random sequence. * * \param base * The pointer to the CRYPTO instance. * * \param lfsr32InitState * A non-zero seed value for the first LFSR. * \param lfsr31InitState * A non-zero seed value for the second LFSR. * \param lfsr29InitState * A non-zero seed value for the third LFSR. * * \return * \ref cy_en_crypto_status_t * *******************************************************************************/ cy_en_crypto_status_t Cy_Crypto_Core_V1_Prng_Init(CRYPTO_Type *base, uint32_t lfsr32InitState, uint32_t lfsr31InitState, uint32_t lfsr29InitState) { REG_CRYPTO_PR_LFSR_CTL0(base) = (uint32_t)(_VAL2FLD(CRYPTO_PR_LFSR_CTL0_LFSR32, lfsr32InitState)); REG_CRYPTO_PR_LFSR_CTL1(base) = (uint32_t)(_VAL2FLD(CRYPTO_PR_LFSR_CTL1_LFSR31, lfsr31InitState)); REG_CRYPTO_PR_LFSR_CTL2(base) = (uint32_t)(_VAL2FLD(CRYPTO_PR_LFSR_CTL2_LFSR29, lfsr29InitState)); return (CY_CRYPTO_SUCCESS); } /******************************************************************************* * Function Name: Cy_Crypto_Core_V1_Prng ****************************************************************************//** * * Generates a Pseudo Random Number. * * \param base * The pointer to the CRYPTO instance. * * \param max * The maximum value of a random number. * * \param randomNum * The pointer to a variable to store the generated pseudo random number. * * \return * \ref cy_en_crypto_status_t * *******************************************************************************/ cy_en_crypto_status_t Cy_Crypto_Core_V1_Prng(CRYPTO_Type *base, uint32_t max, uint32_t *randomNum) { Cy_Crypto_SetReg1Instr(base, max); Cy_Crypto_Run1ParamInstr(base, CY_CRYPTO_V1_PRNG_OPC, CY_CRYPTO_RSRC0_SHIFT); /* Wait until the PRNG instruction is complete */ while(0uL != _FLD2VAL(CRYPTO_STATUS_PR_BUSY, REG_CRYPTO_STATUS(base))) { } *randomNum = (uint32_t)_FLD2VAL(CRYPTO_PR_RESULT_DATA32, REG_CRYPTO_PR_RESULT(base)); return (CY_CRYPTO_SUCCESS); } #endif /* #if (CPUSS_CRYPTO_PR == 1) */ #if defined(__cplusplus) } #endif #endif /* CY_IP_MXCRYPTO */ /* [] END OF FILE */