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/*
* Copyright (c) 2021, Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*
*/
#include <stddef.h>
#include "tfm_plat_crypto_nv_seed.h"
#include "psa/internal_trusted_storage.h"
#ifndef TFM_PSA_API
#include "mbedtls/entropy.h"
static unsigned char seed_buf[MBEDTLS_ENTROPY_BLOCK_SIZE];
/*
\brief Copy the seed to the destination buffer
\param[out] p_dst Pointer to buffer where to store the seed
\param[in] p_src Pointer to the seed
\param[in] size Length of the seed
*/
static inline void copy_seed(uint8_t *p_dst, const uint8_t *p_src, size_t size)
{
uint32_t i;
for (i = size; i > 0; i--) {
*p_dst = *p_src;
p_src++;
p_dst++;
}
}
#endif
int tfm_plat_crypto_nv_seed_read(unsigned char *buf, size_t buf_len)
{
#ifdef TFM_PSA_API
psa_storage_uid_t uid = NV_SEED_FILE_ID;
psa_status_t status;
size_t data_length = 0;
status = psa_its_get(uid, 0, buf_len, buf, &data_length);
if (status == PSA_SUCCESS && data_length == buf_len) {
return TFM_CRYPTO_NV_SEED_SUCCESS;
} else {
return TFM_CRYPTO_NV_SEED_FAILED;
}
#else
if (buf_len != MBEDTLS_ENTROPY_BLOCK_SIZE) {
return TFM_CRYPTO_NV_SEED_FAILED;
} else {
copy_seed(buf, seed_buf, buf_len);
return TFM_CRYPTO_NV_SEED_SUCCESS;
}
#endif
}
int tfm_plat_crypto_nv_seed_write(const unsigned char *buf, size_t buf_len)
{
#ifdef TFM_PSA_API
psa_storage_uid_t uid = NV_SEED_FILE_ID;
psa_status_t status;
status = psa_its_set(uid, buf_len, buf, 0);
if (status == PSA_SUCCESS) {
return TFM_CRYPTO_NV_SEED_SUCCESS;
} else {
return TFM_CRYPTO_NV_SEED_FAILED;
}
#else
if (buf_len != MBEDTLS_ENTROPY_BLOCK_SIZE) {
return TFM_CRYPTO_NV_SEED_FAILED;
} else {
copy_seed(seed_buf, buf, buf_len);
return TFM_CRYPTO_NV_SEED_SUCCESS;
}
#endif
}
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