mirror of
https://github.com/infiniteCable2/panda.git
synced 2026-02-18 17:23:52 +08:00
81 lines
1.6 KiB
C
81 lines
1.6 KiB
C
#define BOOTSTUB
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#ifdef STM32F4
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#define PANDA
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#include "stm32f4xx.h"
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#include "stm32f4xx_hal_gpio_ex.h"
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#else
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#include "stm32f2xx.h"
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#include "stm32f2xx_hal_gpio_ex.h"
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#endif
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#include "early.h"
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#include "libc.h"
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#include "spi.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 "spi_flasher.h"
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void __initialize_hardware_early() {
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early();
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}
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void fail() {
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#ifdef PANDA
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volatile int i;
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// detect usb host
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GPIOA->PUPDR |= GPIO_PUPDR_PUPDR11_0;
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for (i=0;i<PULL_EFFECTIVE_DELAY;i++);
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int no_usb = GPIOA->IDR & (1 << 11);
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GPIOA->PUPDR &= ~(GPIO_PUPDR_PUPDR11_0);
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if (no_usb) {
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// no usb host, go to SPI flasher
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spi_flasher();
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} else {
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// has usb host, go to USB flasher
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enter_bootloader_mode = ENTER_BOOTLOADER_MAGIC;
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NVIC_SystemReset();
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}
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#else
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enter_bootloader_mode = ENTER_BOOTLOADER_MAGIC;
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NVIC_SystemReset();
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#endif
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}
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int main() {
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clock_init();
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// validate length
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int len = (int)_app_start[0];
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if ((len < 8) || (((uint32_t)&_app_start[0] + RSANUMBYTES) >= 0x8100000)) 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 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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good:
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// jump to flash
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((void(*)()) _app_start[1])();
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return 0;
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}
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