HMAC: adding upstream message support

components/esp32s2/include/esp_crypto_lock.h

@@ -0,0 +1,41 @@
+// 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 ESP cryptography peripheral.
+ */
+void esp_crypto_lock_acquire(void);
+
+/**
+ * Release the lock for the ESP cryptography peripheral.
+ */
+void esp_crypto_lock_release(void);
+
+#ifdef __cplusplus
+}
+#endif