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112 lines
4.5 KiB
C
112 lines
4.5 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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#pragma once
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#include <stdbool.h>
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#include <stdint.h>
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#include "mbedtls/ecp.h"
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#include "mbedtls/pk.h"
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#include "sdkconfig.h"
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#include "soc/soc_caps.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define USE_ECDSA_KEY_FROM_KEY_MANAGER INT_MAX
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/**
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* @brief ECDSA private key context initialization config structure
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* @note Contains configuration information like the efuse key block that should be used as the private key,
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* EC group ID of the private key and if the export public key operation is supported
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* by the peripheral, a flag load_pubkey that is used specify if the public key has to be populated
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*/
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typedef struct {
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mbedtls_ecp_group_id grp_id; /*!< MbedTLS ECP group identifier */
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uint8_t efuse_block; /*!< EFuse block id for ECDSA private key */
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#ifdef SOC_ECDSA_SUPPORT_EXPORT_PUBKEY
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bool load_pubkey; /*!< Export ECDSA public key from the hardware */
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#endif
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bool use_km_key; /*!< Use key deployed in the key manager for ECDSA operation.
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Note: The key must be already deployed by the application and it must be activated for the lifetime of this context */
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} esp_ecdsa_pk_conf_t; //TODO: IDF-9008 (Add a config to select the ecdsa key from the key manager peripheral)
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#if SOC_ECDSA_SUPPORT_EXPORT_PUBKEY || __DOXYGEN__
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/**
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* @brief Populate the public key buffer of the mbedtls_ecp_keypair context.
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*
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* @param keypair The mbedtls ECP key-pair structure
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* @param efuse_blk The efuse key block that should be used as the private key.
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* The key purpose of this block must be ECDSA_KEY
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* @return - 0 if successful
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* - MBEDTLS_ERR_ECP_BAD_INPUT_DATA if invalid ecp group id specified
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* - MBEDTLS_ERR_ECP_INVALID_KEY if efuse block with purpose ECDSA_KEY is not found
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* - -1 if invalid efuse block is specified
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*/
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int esp_ecdsa_load_pubkey(mbedtls_ecp_keypair *keypair, int efuse_blk);
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#endif // SOC_ECDSA_SUPPORT_EXPORT_PUBKEY || __DOXYGEN__
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#if CONFIG_MBEDTLS_HARDWARE_ECDSA_SIGN || __DOXYGEN__
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/**
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* @brief Initialize MPI to notify mbedtls_ecdsa_sign to use the private key in efuse
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* We break the MPI struct of the private key in order to
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* differentiate between hardware key and software key
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*
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* @param key The MPI in which this functions stores the hardware context.
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* This must be uninitialized
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* @param efuse_blk The efuse key block that should be used as the private key.
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* The key purpose of this block must be ECDSA_KEY
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*
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* @return - 0 if successful
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* - -1 otherwise
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*
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*/
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int esp_ecdsa_privkey_load_mpi(mbedtls_mpi *key, int efuse_blk);
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/**
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* @brief Initialize PK context to notify mbedtls_ecdsa_sign to use the private key in efuse
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* We break the MPI struct used to represent the private key `d` in ECP keypair
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* in order to differentiate between hardware key and software key
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*
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* @param key_ctx The context in which this functions stores the hardware context.
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* This must be uninitialized
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* @param efuse_blk The efuse key block that should be used as the private key.
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* The key purpose of this block must be ECDSA_KEY
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*
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* @return - 0 if successful
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* - -1 otherwise
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*/
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int esp_ecdsa_privkey_load_pk_context(mbedtls_pk_context *key_ctx, int efuse_blk);
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/**
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* @brief Initialize PK context and completely populate mbedtls_ecp_keypair context.
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* We break the MPI struct used to represent the private key `d` in ECP keypair
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* in order to differentiate between hardware key and software key.
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* We also populate the ECP group field present in the mbedtls_ecp_keypair context.
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* If the ECDSA peripheral of the chip supports exporting the public key,
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* we can also populate the public key buffer of the mbedtls_ecp_keypair context
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* if the load_pubkey flag is set in the esp_ecdsa_pk_conf_t config argument.
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*
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* @param key_ctx The context in which this functions stores the hardware context.
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* This must be uninitialized
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* @param conf ESP-ECDSA private key context initialization config structure
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*
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* @return - 0 if successful
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* - -1 otherwise
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*/
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int esp_ecdsa_set_pk_context(mbedtls_pk_context *key_ctx, esp_ecdsa_pk_conf_t *conf);
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#endif // CONFIG_MBEDTLS_HARDWARE_ECDSA_SIGN || __DOXYGEN__
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#ifdef __cplusplus
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}
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#endif
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