HMAC: adding upstream message support

components/esp32s2/esp_crypto_lock.c

@@ -0,0 +1,32 @@
+// 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"
+
+/* Single lock for SHA engine
+*/
+static _lock_t s_crypto_lock;
+
+void esp_crypto_lock_acquire(void)
+{
+    _lock_acquire(&s_crypto_lock);
+}
+
+void esp_crypto_lock_release(void)
+{
+    _lock_release(&s_crypto_lock);
+}
+