esp_rom: Add initial ESP32-C3 support

From internal commit 7761d6e8

components/esp_rom/include/esp32c3/rom/hmac.h

@@ -0,0 +1,63 @@
+// Copyright 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 _ROM_HMAC_H_
+#define _ROM_HMAC_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <stdlib.h>
+#include "efuse.h"
+
+void ets_hmac_enable(void);
+
+void ets_hmac_disable(void);
+
+/* Use the "upstream" HMAC key (ETS_EFUSE_KEY_PURPOSE_HMAC_UP)
+   to digest a message.
+*/
+int ets_hmac_calculate_message(ets_efuse_block_t key_block, const void *message, size_t message_len, uint8_t *hmac);
+
+/* Calculate a downstream HMAC message to temporarily enable JTAG, or
+   to generate a Digital Signature data decryption key.
+
+   - purpose must be ETS_EFUSE_KEY_PURPOSE_HMAC_DOWN_DIGITAL_SIGNATURE
+     or ETS_EFUSE_KEY_PURPOSE_HMAC_DOWN_JTAG
+
+   - key_block must be in range ETS_EFUSE_BLOCK_KEY0 toETS_EFUSE_BLOCK_KEY6.
+     This efuse block must have the corresponding purpose set in "purpose", or
+     ETS_EFUSE_KEY_PURPOSE_HMAC_DOWN_ALL.
+
+   The result of this HMAC calculation is only made available "downstream" to the
+   corresponding hardware module, and cannot be accessed by software.
+*/
+int ets_hmac_calculate_downstream(ets_efuse_block_t key_block, ets_efuse_purpose_t purpose);
+
+/* Invalidate a downstream HMAC value previously calculated by ets_hmac_calculate_downstream().
+ *
+ * - purpose must match a previous call to ets_hmac_calculate_downstream().
+ *
+ * After this function is called, the corresponding internal operation (JTAG or DS) will no longer
+ * have access to the generated key.
+ */
+int ets_hmac_invalidate_downstream(ets_efuse_purpose_t purpose);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // _ROM_HMAC_H_