esp32c3: added target component

components/esp32c3/include/esp_hmac.h

@@ -0,0 +1,67 @@
+// 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.
+
+#ifndef _ESP_HMAC_H_
+#define _ESP_HMAC_H_
+
+#include <stdbool.h>
+#include "esp_err.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * The possible efuse keys for the HMAC peripheral
+ */
+typedef enum {
+    HMAC_KEY0 = 0,
+    HMAC_KEY1,
+    HMAC_KEY2,
+    HMAC_KEY3,
+    HMAC_KEY4,
+    HMAC_KEY5,
+    HMAC_KEY_MAX
+} hmac_key_id_t;
+
+/**
+ * @brief
+ * Calculate the HMAC of a given message.
+ *
+ * Calculate the HMAC \c hmac of a given message \c message with length \c message_len.
+ * SHA256 is used for the calculation (fixed on ESP32S2).
+ *
+ * @note Uses the HMAC peripheral in "upstream" mode.
+ *
+ * @param key_id Determines which of the 6 key blocks in the efuses should be used for the HMAC calcuation.
+ *        The corresponding purpose field of the key block in the efuse must be set to the HMAC upstream purpose value.
+ * @param message the message for which to calculate the HMAC
+ * @param message_len message length
+ *             return ESP_ERR_INVALID_STATE if unsuccessful
+ * @param [out] hmac the hmac result; the buffer behind the provided pointer must be 32 bytes long
+ *
+ * @return
+ *      * ESP_OK, if the calculation was successful,
+ *      * ESP_FAIL, if the hmac calculation failed
+ */
+esp_err_t esp_hmac_calculate(hmac_key_id_t key_id,
+        const void *message,
+        size_t message_len,
+        uint8_t *hmac);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // _ESP_HMAC_H_