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32a6550e87
ESP32C2 has a ECC hardware accelerator capable of performing point multiplication and point verification with a significant performance boost
61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
/*
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* SPDX-FileCopyrightText: 2021-2022 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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#pragma once
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#include <stdint.h>
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#include <stdbool.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define P256_LEN (256/8)
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#define P192_LEN (192/8)
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/* Note: x & y are stored in little endian order (same as CPU byte order, and order used internally by most libraries).
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This is the same order used in hardware
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Note this is opposite to most byte string formats used to represent keys, which are often big endian
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*/
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typedef struct {
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uint8_t x[P256_LEN]; /* Little endian order */
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uint8_t y[P256_LEN]; /* Little endian order */
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unsigned len; /* P192_LEN or P256_LEN */
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} ecc_point_t;
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/**
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* @brief Perform ECC point multiplication (R = K * (Px, Py))
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*
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* @param point ECC point (multiplicand)
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* @param scalar Integer represented in byte array format (multiplier)
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* @param result Result of the multiplication
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* @param verify_first Verify that the point is on the curve before performing multiplication
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*
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* @return - 0 if the multiplication was successful
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* - -1 otherwise
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*
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* @note 'scalar' is expected as a byte array in little endian order.
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* Most byte string formats used to represent keys are in big endian order.
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*/
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int esp_ecc_point_multiply(const ecc_point_t *point, const uint8_t *scalar, ecc_point_t *result, bool verify_first);
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/**
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* @brief Perform ECC point verification,
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* i.e check whether the point (Px, Py) lies on the curve
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*
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* @param point ECC point that needs to be verified
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*
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* @return - 1, if point lies on the curve
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* - 0, otherwise
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*
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*/
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int esp_ecc_point_verify(const ecc_point_t *point);
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#ifdef __cplusplus
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}
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#endif
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