OVMS3-idf/components/esp32s2/include/esp_crypto_lock.h

// 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.

#pragma once

#ifdef __cplusplus
extern "C" {
#endif

/**
 * This API should be used by all components which use the SHA, AES, HMAC and DS crypto hardware on the ESP32S2.
 * They can not be used in parallel because they use the same DMA or are calling each other.
 * E.g., HMAC uses SHA or DS uses HMAC and AES. See the ESP32S2 Technical Reference Manual for more details.
 *
 * Other unrelated components must not use it.
 */

/**
 * Acquire lock for the AES and SHA cryptography peripherals, which both use the crypto DMA.
 */
void esp_crypto_dma_lock_acquire(void);

/**
 * Release lock for the AES and SHA cryptography peripherals, which both use the crypto DMA.
 */
void esp_crypto_dma_lock_release(void);

/**
 * Acquire lock for the MPI/RSA cryptography peripheral
 */
void esp_crypto_mpi_lock_acquire(void);

/**
 * Release lock for the MPI/RSA cryptography peripheral
 */
void esp_crypto_mpi_lock_release(void);

#ifdef __cplusplus
}
#endif