63 lines
2.1 KiB
C
63 lines
2.1 KiB
C
// Copyright 2018 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_
|