1 /*
2 * SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6 #include <stdbool.h>
7 #include <string.h>
8 #include <sys/param.h>
9 #include "rom/ecdsa.h"
10
11 #define ROM_FUNC_TYPECAST int(*)(const uint8_t*, const uint8_t*, int, const uint8_t*, uint8_t*)
12
13 extern uint32_t _rom_eco_version;
14 int (*_rom_ets_ecdsa_verify)(const uint8_t*, const uint8_t*, int, const uint8_t*, uint8_t*);
15
16 /* On ESP32-C6 ECO 0, the ROM interface hasn't exposed ets_ecdsa_verify symbol, so for that we have defined
17 * the function here and then jump to the absolute address in ROM.
18 *
19 * There is a possibility of updating the ROM in the future chip revisions without any major upgrades,
20 * in that case, the same binary should work as is on the new chip revision. For that, we check the _rom_eco_version
21 * and if its a newer one, we jump to the new ROM interface. These addresses won't change in the future
22 *
23 * ets_ecdsa_verify symbol will be present in the upcoming ROM ECO versions so even though we have defined it here,
24 * linker will pick the symbol address from rom.ld file
25 */
ets_ecdsa_verify(const uint8_t * key,const uint8_t * sig,ECDSA_CURVE curve_id,const uint8_t * image_digest,uint8_t * verified_digest)26 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)
27 {
28 if (_rom_eco_version == 0) {
29 _rom_ets_ecdsa_verify = (ROM_FUNC_TYPECAST)0x4001a824;
30 return _rom_ets_ecdsa_verify(key, sig, curve_id, image_digest, verified_digest);
31 } else {
32 _rom_ets_ecdsa_verify = (ROM_FUNC_TYPECAST)0x40001490;
33 return _rom_ets_ecdsa_verify(key, sig, curve_id, image_digest, verified_digest);
34 }
35 }
36