mirror of https://github.com/ARMmbed/mbed-os.git
77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2019 Cypress Semiconductor Corporation
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* Hardware entropy collector for the PSoC6A families */
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#if DEVICE_TRNG
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#if !(defined(TARGET_PSA) && defined(COMPONENT_NSPE))
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#include "trng_api.h"
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#include "psoc6_utils.h"
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#include "cy_crypto_core_trng.h"
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/* Initialization polynomial values fro True Random Generator */
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#define GARO31_INITSTATE (0x04c11db7UL)
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#define FIRO31_INITSTATE (0x04c11db7UL)
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#define MAX_TRNG_BIT_SIZE (32UL)
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void trng_init(trng_t *obj)
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{
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(void)obj;
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cy_reserve_crypto(CY_CRYPTO_TRNG_HW);
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}
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void trng_free(trng_t *obj)
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{
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/* Deinitialization is not needed for the driver */
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(void)obj;
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cy_free_crypto(CY_CRYPTO_TRNG_HW);
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}
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int trng_get_bytes(trng_t *obj, uint8_t *output, size_t length, size_t *output_length)
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{
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int ret = 0;
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*output_length = 0U;
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/* temporary random data buffer */
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uint32_t random;
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(void)obj;
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/* Get Random byte */
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while ((*output_length < length) && (ret == 0)) {
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if (Cy_Crypto_Core_Trng(CRYPTO, GARO31_INITSTATE, FIRO31_INITSTATE, MAX_TRNG_BIT_SIZE, &random) != CY_CRYPTO_SUCCESS) {
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ret = -1;
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} else {
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for (uint8_t i = 0; (i < 4U) && (*output_length < length) ; i++) {
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*output++ = ((uint8_t *)&random)[i];
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*output_length += 1U;
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}
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}
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}
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random = 0UL;
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return (ret);
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}
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#endif // #if !(defined(TARGET_PSA) && defined(COMPONENT_NSPE))
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#endif
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