I’m trying to port mbedTLS to my embedded system (TI CC3200) to generate an RSA private key.
Unfortunately this MCU doesn’t have an hardware RNG, so I found on github a library to generate random numbers.
I found this function into RSA module:
int mbedtls_rsa_gen_key( mbedtls_rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
unsigned int nbits, int exponent )
I also read the related documentation but I don’t understand the parameters meaning.
What are the meaning of the rng function parameters?
Could someone provide an example?
Thanks in advance for the help.
PS: please note that my application is not for commercial use, so I can use a weak random number generator.