prime numbers

#include <stdio.h>

/*openssl library includes*/
#include <openssl/bn.h>
#include <openssl/ssl.h>

/*function definitions*/
static void prime_status(int code, int arg, void *cb_arg);
BIGNUM *generate_prime(int bits, int safe);

/*show prime status - callback*/
static void prime_status(int code, int arg, void *cb_arg)
{
		if (code==0)
			fprintf(stderr, "\n * Found potential prime #%d ... ", (arg + 1));
		else if (code == 1 && arg && !(arg % 10))
			fprintf(stderr, ".");
		else
			fprintf(stderr, "\nGot one !\n");		
}

/*generate prime - bits, safe*/
BIGNUM *generate_prime(int bits, int safe)
{
	char *string;
	BIGNUM *prime;
	
	fprintf(stderr, "Searching from a %sprime %d bits in size ...", (safe ? "safe" : ""), bits);

    /*generate prime*/	
	prime=BN_generate_prime(NULL, bits, safe, NULL, NULL, prime_status, NULL);
	
	   /*if not generated, return NULL pointer*/
		if(!prime)
			return NULL;
			
	/*convert big number to decimal*/
	string=BN_bn2dec(prime);
	
	/*show result*/
	if(string)
	{
		fprintf(stderr, "Found prime: %s\n", string);
		OPENSSL_free(string);
	}
	
	return prime;
}

int main()
{
	/*pointer on BIGNUM*/
	BIGNUM *bn;

	
    /*allocate an initialize a new BIGNUM - dynamicaly*/
	bn=BN_new();
		
		
		/*get big number - prime, 100-bits 10-safe*/	
		/*CHANGE THIS VALUES*/	
		if((bn = generate_prime(100, 100)) == NULL)
		{
			fprintf(stderr, "Can't generate prime !!!\n");
			return -3;
		}
	
	/*free memory*/
	BN_free(bn);
	
    return 1;
}