mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-15 19:08:07 +00:00
119 lines
3.2 KiB
C
119 lines
3.2 KiB
C
/*
|
|
* This file is part of the Trezor project, https://trezor.io/
|
|
*
|
|
* Copyright (c) SatoshiLabs
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <trezor_bsp.h>
|
|
#include <trezor_model.h>
|
|
#include <trezor_rtl.h>
|
|
|
|
#include <util/flash.h>
|
|
#include <util/fwutils.h>
|
|
#include <util/image.h>
|
|
#include "blake2s.h"
|
|
#include "flash_area.h"
|
|
|
|
#ifdef KERNEL_MODE
|
|
|
|
#define FW_HASHING_CHUNK_SIZE 1024
|
|
|
|
secbool firmware_calc_hash(const uint8_t* challenge, size_t challenge_len,
|
|
uint8_t* hash, size_t hash_len,
|
|
firmware_hash_callback_t callback,
|
|
void* callback_context) {
|
|
BLAKE2S_CTX ctx;
|
|
|
|
if (challenge_len != 0) {
|
|
if (blake2s_InitKey(&ctx, BLAKE2S_DIGEST_LENGTH, challenge,
|
|
challenge_len) != 0) {
|
|
return secfalse;
|
|
}
|
|
} else {
|
|
blake2s_Init(&ctx, BLAKE2S_DIGEST_LENGTH);
|
|
}
|
|
|
|
uint32_t firmware_size = flash_area_get_size(&FIRMWARE_AREA);
|
|
uint32_t chunks = firmware_size / FW_HASHING_CHUNK_SIZE;
|
|
|
|
ensure((firmware_size % FW_HASHING_CHUNK_SIZE == 0) * sectrue,
|
|
"Cannot compute FW hash.");
|
|
|
|
for (int i = 0; i < chunks; i++) {
|
|
if (callback != NULL && (i % 128 == 0)) {
|
|
callback(callback_context, i, chunks);
|
|
}
|
|
|
|
const void* data = flash_area_get_address(
|
|
&FIRMWARE_AREA, i * FW_HASHING_CHUNK_SIZE, FW_HASHING_CHUNK_SIZE);
|
|
|
|
if (data == NULL) {
|
|
return secfalse;
|
|
}
|
|
|
|
blake2s_Update(&ctx, data, FW_HASHING_CHUNK_SIZE);
|
|
}
|
|
|
|
if (callback != NULL) {
|
|
callback(callback_context, chunks, chunks);
|
|
}
|
|
|
|
if (blake2s_Final(&ctx, hash, hash_len) != 0) {
|
|
return secfalse;
|
|
}
|
|
|
|
return sectrue;
|
|
}
|
|
|
|
secbool firmware_get_vendor(char* buff, size_t buff_size) {
|
|
const void* data = flash_area_get_address(&FIRMWARE_AREA, 0, 0);
|
|
|
|
vendor_header vhdr = {0};
|
|
|
|
memset(buff, 0, buff_size);
|
|
|
|
if (data == NULL || sectrue != read_vendor_header(data, &vhdr)) {
|
|
return secfalse;
|
|
}
|
|
|
|
if (buff_size < vhdr.vstr_len + 1) {
|
|
return secfalse;
|
|
}
|
|
|
|
memcpy(buff, vhdr.vstr, vhdr.vstr_len);
|
|
|
|
return sectrue;
|
|
}
|
|
|
|
void firmware_invalidate_header(void) {
|
|
#ifdef STM32U5
|
|
// on stm32u5, we need to disable the instruction cache before erasing the
|
|
// firmware - otherwise, the write check will fail
|
|
ICACHE->CR &= ~ICACHE_CR_EN;
|
|
#endif
|
|
|
|
// erase start of the firmware (metadata) -> invalidate FW
|
|
ensure(flash_unlock_write(), NULL);
|
|
for (int i = 0; i < (1024 / FLASH_BLOCK_SIZE); i++) {
|
|
flash_block_t data = {0};
|
|
ensure(flash_area_write_block(&FIRMWARE_AREA, i * FLASH_BLOCK_SIZE, data),
|
|
NULL);
|
|
}
|
|
ensure(flash_lock_write(), NULL);
|
|
}
|
|
|
|
#endif // KERNEL_MODE
|