e66e87aa8e
This is Atmel/Microchip's official library for interfacing to the Atmel ATECC508 chip. The submodule points to their repository in GitHub. Additionally, this includes the HAL necessary to use this library in esp_open_rtos using the i2c library in extras/i2c. I have also included a tool I wrote to play with the chip as an example under examples/atcatool. The extras module currently overrides atca_iface.h to fix bug in cryptoauthlib (c11-only feature, which breaks c++ builds that want to use cryptoauthlib)
83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
#include "cryptoauthlib.h"
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#include "lwip/def.h"
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#include <stdio.h>
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#include <malloc.h>
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#define ATEC_DEBUG
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#ifdef ATEC_DEBUG
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#define DBG(...) printf("%s:%d ",__FILE__,__LINE__); printf(__VA_ARGS__); printf("\r\n");
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#define DBGX(...) printf(__VA_ARGS__);
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#else
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#define DBGV(...) {};
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#define DBGVX(...) {};
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#endif
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void init_cryptoauthlib(uint8_t i2c_addr)
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{
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uint32_t revision;
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uint32_t serial[(ATCA_SERIAL_NUM_SIZE + sizeof(uint32_t) - 1) / sizeof(uint32_t)];
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bool config_is_locked, data_is_locked;
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ATCA_STATUS status;
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const ATCAIfaceCfg *atca_cfg;
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/*
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* Allow for addresses either in 7-bit format (0-7F) or in Atmel 8-bit shifted-by-one format.
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* If user specifies address > 0x80, it must be already shifted since I2C bus addresses > 0x7f are invalid.
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*/
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if (i2c_addr < 0x7f) i2c_addr <<= 1;
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atca_cfg = &cfg_ateccx08a_i2c_default;
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if (atca_cfg->atcai2c.slave_address != i2c_addr)
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{
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ATCAIfaceCfg *cfg = (ATCAIfaceCfg *) calloc(1, sizeof(*cfg));
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memcpy(cfg, &cfg_ateccx08a_i2c_default, sizeof(*cfg));
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cfg->atcai2c.slave_address = i2c_addr;
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atca_cfg = cfg;
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}
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status = atcab_init(atca_cfg);
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if (status != ATCA_SUCCESS)
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{
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DBG("ATCA: Library init failed");
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goto out;
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}
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status = atcab_info((uint8_t *) &revision);
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if (status != ATCA_SUCCESS)
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{
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DBG("ATCA: Failed to get chip info");
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goto out;
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}
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status = atcab_read_serial_number((uint8_t *) serial);
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if (status != ATCA_SUCCESS)
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{
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DBG("ATCA: Failed to get chip serial number");
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goto out;
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}
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status = atcab_is_locked(LOCK_ZONE_CONFIG, &config_is_locked);
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status = atcab_is_locked(LOCK_ZONE_DATA, &data_is_locked);
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if (status != ATCA_SUCCESS)
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{
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DBG("ATCA: Failed to get chip zone lock status");
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goto out;
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}
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DBG("ATECC508 @ 0x%02x: rev 0x%04x S/N 0x%04x%04x%02x, zone "
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"lock status: %s, %s",
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i2c_addr >> 1, htonl(revision), htonl(serial[0]), htonl(serial[1]),
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*((uint8_t *) &serial[2]), (config_is_locked ? "yes" : "no"),
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(data_is_locked ? "yes" : "no"));
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out:
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/*
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* We do not free atca_cfg in case of an error even if it was allocated
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* because it is referenced by ATCA basic object.
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*/
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if (status != ATCA_SUCCESS)
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{
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DBG("ATCA: Chip is not available");
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/* In most cases the device can still work, so we continue anyway. */
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}
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}
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