/***************************************************************************//** * \file cy_crypto_core_trng_v1.c * \version 2.40 * * \brief * This file provides the source code to the API for the TRNG * 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_trng_v1.h" #if defined(__cplusplus) extern "C" { #endif #if (CPUSS_CRYPTO_TR == 1) #include "cy_crypto_core_hw_v1.h" #include "cy_crypto_core_trng_config_v1.h" #include "cy_syslib.h" static void Cy_Crypto_Core_V1_Trng_Init(CRYPTO_Type *base); static void Cy_Crypto_Core_V1_Trng_Disable(CRYPTO_Type *base); /******************************************************************************* * Function Name: Cy_Crypto_Core_V1_Trng_Init ****************************************************************************//** * * Initializes the TRNG parameters. * * \param base * The pointer to the CRYPTO instance. * *******************************************************************************/ static void Cy_Crypto_Core_V1_Trng_Init(CRYPTO_Type *base) { REG_CRYPTO_TR_CTL0(base) = CY_CRYPTO_V1_TR_CTL0_VAL; REG_CRYPTO_TR_CTL1(base) = CY_CRYPTO_V1_TR_CTL1_VAL; REG_CRYPTO_TR_MON_CTL(base) = CY_CRYPTO_V1_TR_BTSTR_SEL; REG_CRYPTO_TR_MON_CMD(base) = CY_CRYPTO_V1_TR_START_MON; REG_CRYPTO_TR_MON_RC_CTL(base) = CY_CRYPTO_V1_TR_RC_CUTOFF; REG_CRYPTO_TR_MON_AP_CTL(base) = CY_CRYPTO_V1_TR_AC_CUTOFF; } /******************************************************************************* * Function Name: Cy_Crypto_Core_V1_Trng_Disable ****************************************************************************//** * * Disable TRNG by disabling TRNG ring oscillators * * \param base * The pointer to the CRYPTO instance. * *******************************************************************************/ static void Cy_Crypto_Core_V1_Trng_Disable(CRYPTO_Type *base) { REG_CRYPTO_TR_CTL1(base) = CY_CRYPTO_V1_TR_CTL1_DISABLE_VAL; } /******************************************************************************* * Function Name: Cy_Crypto_Core_V1_Trng ****************************************************************************//** * * Generates a True Random Number. * * \param base * The pointer to the CRYPTO instance. * * \param GAROPol * The polynomial for the programmable Galois ring oscillator. * * \param FIROPol * The polynomial for the programmable Fibonacci ring oscillator. * * \param max * The maximum length of a random number, in the range [0, 32] bits. * * \param randomNum * The pointer to a generated true random number. Must be 4-byte aligned. * * \return * \ref cy_en_crypto_status_t * *******************************************************************************/ cy_en_crypto_status_t Cy_Crypto_Core_V1_Trng(CRYPTO_Type *base, uint32_t GAROPol, uint32_t FIROPol, uint32_t max, uint32_t *randomNum) { Cy_Crypto_Core_V1_Trng_Init(base); REG_CRYPTO_TR_GARO_CTL(base) = GAROPol; REG_CRYPTO_TR_FIRO_CTL(base) = FIROPol; Cy_Crypto_SetReg1Instr(base, max); Cy_Crypto_Run1ParamInstr(base, CY_CRYPTO_V1_TRNG_OPC, CY_CRYPTO_RSRC0_SHIFT); /* Wait until the TRNG instruction is complete */ while (0uL != _FLD2VAL(CRYPTO_STATUS_TR_BUSY, REG_CRYPTO_STATUS(base))) { } *randomNum = (uint32_t)_FLD2VAL(CRYPTO_TR_RESULT_DATA32, REG_CRYPTO_TR_RESULT(base)); /* Disable TRNG to reduce power consumption */ Cy_Crypto_Core_V1_Trng_Disable(base); return (CY_CRYPTO_SUCCESS); } #endif /* #if (CPUSS_CRYPTO_TR == 1) */ #if defined(__cplusplus) } #endif #endif /* CY_IP_MXCRYPTO */ /* [] END OF FILE */