openpilot is an open source driver assistance system. openpilot performs the functions of Automated Lane Centering and Adaptive Cruise Control for over 200 supported car makes and models.

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/*
gcc -DTEST_RSA test_rsa.c ../crypto/rsa.c ../crypto/sha.c && ./a.out
*/
#include <stdio.h>
#include <stdlib.h>
#define MAX_LEN 0x40000
char buf[MAX_LEN];
#include "../crypto/sha.h"
#include "../crypto/rsa.h"
#include "../obj/cert.h"
int main() {
FILE *f = fopen("../obj/panda.bin", "rb");
int tlen = fread(buf, 1, MAX_LEN, f);
fclose(f);
printf("read %d\n", tlen);
uint32_t *_app_start = (uint32_t *)buf;
int len = _app_start[0];
char digest[SHA_DIGEST_SIZE];
SHA_hash(&_app_start[1], len-4, digest);
printf("SHA hash done\n");
if (!RSA_verify(&rsa_key, ((void*)&_app_start[0]) + len, RSANUMBYTES, digest, SHA_DIGEST_SIZE)) {
printf("RSA fail\n");
} else {
printf("RSA match!!!\n");
}
return 0;
}