mirror of https://github.com/commaai/panda.git
90 lines
2.0 KiB
C
90 lines
2.0 KiB
C
#define BOOTSTUB
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#define VERS_TAG 0x53524556
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#define MIN_VERSION 2
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// ********************* Includes *********************
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#include "config.h"
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#include "drivers/pwm.h"
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#include "drivers/usb.h"
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#include "early_init.h"
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#include "provision.h"
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#include "crypto/rsa.h"
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#include "crypto/sha.h"
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#include "obj/cert.h"
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#include "obj/gitversion.h"
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#include "flasher.h"
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// cppcheck-suppress unusedFunction ; used in headers not included in cppcheck
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void __initialize_hardware_early(void) {
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early_initialization();
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}
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void fail(void) {
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soft_flasher_start();
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}
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// know where to sig check
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extern void *_app_start[];
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// FIXME: sometimes your panda will fail flashing and will quickly blink a single Green LED
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// BOUNTY: $200 coupon on shop.comma.ai or $100 check.
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int main(void) {
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// Init interrupt table
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init_interrupts(true);
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disable_interrupts();
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clock_init();
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detect_board_type();
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#ifdef PANDA_JUNGLE
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current_board->set_panda_power(true);
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#endif
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if (enter_bootloader_mode == ENTER_SOFTLOADER_MAGIC) {
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enter_bootloader_mode = 0;
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soft_flasher_start();
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}
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// validate length
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int len = (int)_app_start[0];
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if ((len < 8) || (len > (0x1000000 - 0x4000 - 4 - RSANUMBYTES))) goto fail;
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// compute SHA hash
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uint8_t digest[SHA_DIGEST_SIZE];
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SHA_hash(&_app_start[1], len-4, digest);
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// verify version, last bytes in the signed area
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uint32_t vers[2] = {0};
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memcpy(&vers, ((void*)&_app_start[0]) + len - sizeof(vers), sizeof(vers));
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if (vers[0] != VERS_TAG || vers[1] < MIN_VERSION) {
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goto fail;
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}
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// verify RSA signature
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if (RSA_verify(&release_rsa_key, ((void*)&_app_start[0]) + len, RSANUMBYTES, digest, SHA_DIGEST_SIZE)) {
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goto good;
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}
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// allow debug if built from source
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#ifdef ALLOW_DEBUG
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if (RSA_verify(&debug_rsa_key, ((void*)&_app_start[0]) + len, RSANUMBYTES, digest, SHA_DIGEST_SIZE)) {
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goto good;
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}
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#endif
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// here is a failure
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fail:
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fail();
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return 0;
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good:
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// jump to flash
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((void(*)(void)) _app_start[1])();
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return 0;
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}
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