Hello,
I have been trying to implement the Elliptic-curve Diffie–Hellman key exchange using tiny crypt.
As per the API, a random number generator function needs to be passed to create the public and private keys. The random gen function is passed using the setter function uECC_set_rng, I was able to pass the random gen function as a parameter to that function, and further when I call the uECC_make_key and when that function, in turn calls the random gen function for its purpose, the program crashes and reboots. The code has been sown below:
static int random_gen(uint8_t *dest, unsigned size);
void main(void)
{
int rc;
uint8_t pk[64];
uint8_t private_key[32];
uint8_t buffer[10];
uECC_set_rng(&random_gen);
rc = uECC_make_key(pk, private_key, &curve_secp256r1);
if(!rc){
printk("Failed\n");
}
else{
printk("Success\n");
}
return ;
}
static int random_gen(uint8_t *dest, unsigned size) {
uint8_t buffer[64];
int r = 0;
r = sys_csrand_get(dest,size); //crashes here and reboots
if (!r){
printk("success!\n");
}
return 1;
}The program crashes at the sys_csrand_get function, I tried replacing this function and implementing something similar to the entropy example to generate a random number but with the same result.
Any help would be appreciated.
cheers.
