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36 lines
1.6 KiB
C
36 lines
1.6 KiB
C
/*
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* SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <stdbool.h>
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#include <string.h>
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#include <sys/param.h>
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#include "rom/ecdsa.h"
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#define ROM_FUNC_TYPECAST int(*)(const uint8_t*, const uint8_t*, int, const uint8_t*, uint8_t*)
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extern uint32_t _rom_eco_version;
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int (*_rom_ets_ecdsa_verify)(const uint8_t*, const uint8_t*, int, const uint8_t*, uint8_t*);
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/* On ESP32-C6 ECO 0, the ROM interface hasn't exposed ets_ecdsa_verify symbol, so for that we have defined
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* the function here and then jump to the absolute address in ROM.
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*
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* There is a possibility of updating the ROM in the future chip revisions without any major upgrades,
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* in that case, the same binary should work as is on the new chip revision. For that, we check the _rom_eco_version
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* and if its a newer one, we jump to the new ROM interface. These addresses won't change in the future
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*
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* ets_ecdsa_verify symbol will be present in the upcoming ROM ECO versions so even though we have defined it here,
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* linker will pick the symbol address from rom.ld file
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*/
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int ets_ecdsa_verify(const uint8_t *key, const uint8_t *sig, ECDSA_CURVE curve_id, const uint8_t *image_digest, uint8_t *verified_digest)
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{
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if (_rom_eco_version == 0) {
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_rom_ets_ecdsa_verify = (ROM_FUNC_TYPECAST)0x4001a824;
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return _rom_ets_ecdsa_verify(key, sig, curve_id, image_digest, verified_digest);
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} else {
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_rom_ets_ecdsa_verify = (ROM_FUNC_TYPECAST)0x40001490;
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return _rom_ets_ecdsa_verify(key, sig, curve_id, image_digest, verified_digest);
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}
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}
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