112 lines
4.1 KiB
C
112 lines
4.1 KiB
C
/***************************************************************************//**
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* @file trng.c
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* @brief Implementation of the TRNG Interface
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* @author Antoniu Miclaus ([email protected])
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********************************************************************************
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* Copyright 2023(c) Analog Devices, Inc.
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* - Neither the name of Analog Devices, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* - The use of this software may or may not infringe the patent rights
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* of one or more patent holders. This license does not release you
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* from the requirement that you obtain separate licenses from these
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* patent holders to use this software.
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* - Use of the software either in source or binary form, must be run
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* on or directly connected to an Analog Devices Inc. component.
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*
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* THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT,
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, INTELLECTUAL PROPERTY RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*******************************************************************************/
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/******************************************************************************/
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/***************************** Include Files **********************************/
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/******************************************************************************/
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#include <inttypes.h>
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#include "trng.h"
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#include <stdlib.h>
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#include "error.h"
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/******************************************************************************/
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/************************ Functions Definitions *******************************/
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/******************************************************************************/
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/**
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* @brief Initialize the TRNG.
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* @param desc - The TRNG descriptor.
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* @param param - The structure that contains the TRNG parameters.
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* @return 0 in case of success, -1 otherwise.
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*/
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int trng_init(struct trng_desc **desc,
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const struct trng_init_param *param)
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{
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int ret;
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if (!param || !param->platform_ops)
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return -EINVAL;
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if (!param->platform_ops->init)
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return -ENOSYS;
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ret = param->platform_ops->init(desc, param);
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if (ret)
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return ret;
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(*desc)->platform_ops = param->platform_ops;
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return 0;
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}
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/**
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* @brief Free the resources allocated by trng_init().
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* @param desc - The TRNG descriptor.
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* @return 0 in case of success, -1 otherwise.
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*/
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int trng_remove(struct trng_desc *desc)
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{
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if (!desc || !desc->platform_ops)
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return -EINVAL;
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if (!desc->platform_ops->remove)
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return -ENOSYS;
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return desc->platform_ops->remove(desc);
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}
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/**
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* @brief Fill buffer with rng data.
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* @param desc - The TRNG descriptor.
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* @param buff - Buffer to be filled
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* @param len - Size of the buffer
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* @return 0 in case of success, -1 otherwise.
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*/
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int trng_fill_buffer(struct trng_desc *desc, uint8_t *buff,
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uint32_t len)
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{
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if (!desc || !desc->platform_ops)
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return -EINVAL;
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if (!desc->platform_ops->fill_buffer)
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return -ENOSYS;
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return desc->platform_ops->fill_buffer(desc, buff, len);
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}
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