mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-24 15:28:10 +00:00
119 lines
3.2 KiB
C
119 lines
3.2 KiB
C
/*
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* This file is part of the Trezor project, https://trezor.io/
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*
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* Copyright (c) SatoshiLabs
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <trezor_bsp.h>
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#include <trezor_model.h>
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#include <trezor_rtl.h>
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#include <util/flash.h>
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#include <util/fwutils.h>
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#include <util/image.h>
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#include "blake2s.h"
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#include "flash_area.h"
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#ifdef KERNEL_MODE
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#define FW_HASHING_CHUNK_SIZE 1024
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secbool firmware_calc_hash(const uint8_t* challenge, size_t challenge_len,
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uint8_t* hash, size_t hash_len,
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firmware_hash_callback_t callback,
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void* callback_context) {
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BLAKE2S_CTX ctx;
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if (challenge_len != 0) {
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if (blake2s_InitKey(&ctx, BLAKE2S_DIGEST_LENGTH, challenge,
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challenge_len) != 0) {
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return secfalse;
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}
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} else {
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blake2s_Init(&ctx, BLAKE2S_DIGEST_LENGTH);
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}
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uint32_t firmware_size = flash_area_get_size(&FIRMWARE_AREA);
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uint32_t chunks = firmware_size / FW_HASHING_CHUNK_SIZE;
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ensure((firmware_size % FW_HASHING_CHUNK_SIZE == 0) * sectrue,
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"Cannot compute FW hash.");
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for (int i = 0; i < chunks; i++) {
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if (callback != NULL && (i % 128 == 0)) {
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callback(callback_context, i, chunks);
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}
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const void* data = flash_area_get_address(
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&FIRMWARE_AREA, i * FW_HASHING_CHUNK_SIZE, FW_HASHING_CHUNK_SIZE);
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if (data == NULL) {
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return secfalse;
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}
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blake2s_Update(&ctx, data, FW_HASHING_CHUNK_SIZE);
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}
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if (callback != NULL) {
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callback(callback_context, chunks, chunks);
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}
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if (blake2s_Final(&ctx, hash, hash_len) != 0) {
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return secfalse;
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}
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return sectrue;
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}
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secbool firmware_get_vendor(char* buff, size_t buff_size) {
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const void* data = flash_area_get_address(&FIRMWARE_AREA, 0, 0);
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vendor_header vhdr = {0};
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memset(buff, 0, buff_size);
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if (data == NULL || sectrue != read_vendor_header(data, &vhdr)) {
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return secfalse;
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}
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if (buff_size < vhdr.vstr_len + 1) {
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return secfalse;
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}
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memcpy(buff, vhdr.vstr, vhdr.vstr_len);
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return sectrue;
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}
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void firmware_invalidate_header(void) {
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#ifdef STM32U5
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// on stm32u5, we need to disable the instruction cache before erasing the
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// firmware - otherwise, the write check will fail
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ICACHE->CR &= ~ICACHE_CR_EN;
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#endif
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// erase start of the firmware (metadata) -> invalidate FW
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ensure(flash_unlock_write(), NULL);
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for (int i = 0; i < (1024 / FLASH_BLOCK_SIZE); i++) {
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flash_block_t data = {0};
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ensure(flash_area_write_block(&FIRMWARE_AREA, i * FLASH_BLOCK_SIZE, data),
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NULL);
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}
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ensure(flash_lock_write(), NULL);
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}
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#endif // KERNEL_MODE
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