60 lines
2 KiB
C
60 lines
2 KiB
C
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// Copyright 2018-2020 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#pragma once
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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#include "efuse.h"
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void ets_hmac_enable(void);
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void ets_hmac_disable(void);
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/* Use the "upstream" HMAC key (ETS_EFUSE_KEY_PURPOSE_HMAC_UP)
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to digest a message.
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*/
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int ets_hmac_calculate_message(ets_efuse_block_t key_block, const void *message, size_t message_len, uint8_t *hmac);
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/* Calculate a downstream HMAC message to temporarily enable JTAG, or
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to generate a Digital Signature data decryption key.
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- purpose must be ETS_EFUSE_KEY_PURPOSE_HMAC_DOWN_DIGITAL_SIGNATURE
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or ETS_EFUSE_KEY_PURPOSE_HMAC_DOWN_JTAG
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- key_block must be in range ETS_EFUSE_BLOCK_KEY0 toETS_EFUSE_BLOCK_KEY6.
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This efuse block must have the corresponding purpose set in "purpose", or
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ETS_EFUSE_KEY_PURPOSE_HMAC_DOWN_ALL.
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The result of this HMAC calculation is only made available "downstream" to the
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corresponding hardware module, and cannot be accessed by software.
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*/
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int ets_hmac_calculate_downstream(ets_efuse_block_t key_block, ets_efuse_purpose_t purpose);
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/* Invalidate a downstream HMAC value previously calculated by ets_hmac_calculate_downstream().
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*
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* - purpose must match a previous call to ets_hmac_calculate_downstream().
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*
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* After this function is called, the corresponding internal operation (JTAG or DS) will no longer
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* have access to the generated key.
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*/
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int ets_hmac_invalidate_downstream(ets_efuse_purpose_t purpose);
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#ifdef __cplusplus
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}
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#endif
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