esp-idf/components/esp32h2/esp_crypto_lock.c

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// Copyright 2015-2020 Espressif Systems (Shanghai) PTE LTD
//
// 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 <sys/lock.h>
#include "esp_crypto_lock.h"
/* Lock overview:
SHA: peripheral independent, but DMA is shared with AES
AES: peripheral independent, but DMA is shared with SHA
MPI/RSA: independent
HMAC: needs SHA
DS: needs HMAC (which needs SHA), AES and MPI
*/
/* Lock for DS peripheral */
static _lock_t s_crypto_ds_lock;
/* Lock for HMAC peripheral */
static _lock_t s_crypto_hmac_lock;
/* Lock for the MPI/RSA peripheral, also used by the DS peripheral */
static _lock_t s_crypto_mpi_lock;
/* Single lock for SHA and AES, sharing a reserved GDMA channel */
static _lock_t s_crypto_sha_aes_lock;
void esp_crypto_hmac_lock_acquire(void)
{
_lock_acquire(&s_crypto_hmac_lock);
esp_crypto_sha_aes_lock_acquire();
}
void esp_crypto_hmac_lock_release(void)
{
esp_crypto_sha_aes_lock_release();
_lock_release(&s_crypto_hmac_lock);
}
void esp_crypto_ds_lock_acquire(void)
{
_lock_acquire(&s_crypto_ds_lock);
esp_crypto_hmac_lock_acquire();
esp_crypto_mpi_lock_acquire();
}
void esp_crypto_ds_lock_release(void)
{
esp_crypto_mpi_lock_release();
esp_crypto_hmac_lock_release();
_lock_release(&s_crypto_ds_lock);
}
void esp_crypto_sha_aes_lock_acquire(void)
{
_lock_acquire(&s_crypto_sha_aes_lock);
}
void esp_crypto_sha_aes_lock_release(void)
{
_lock_release(&s_crypto_sha_aes_lock);
}
void esp_crypto_mpi_lock_acquire(void)
{
_lock_acquire(&s_crypto_mpi_lock);
}
void esp_crypto_mpi_lock_release(void)
{
_lock_release(&s_crypto_mpi_lock);
}