利用openssl实现RSA密钥生成

#include <openssl/rsa.h>  
#include <openssl/applink.c>
#include <stdio.h>
int main()  {   
	RSA    *r;   
	int    bits=512,ret;   
	unsigned long e=RSA_3;   
	BIGNUM   *bne; 
	r = RSA_generate_key(bits, e, NULL, NULL);   
	RSA_print_fp(stdout, r, 11);   
	RSA_free(r);   
	bne = BN_new();   
	ret = BN_set_word(bne, e);   
	r = RSA_new();   
	ret = RSA_generate_key_ex(r, bits, bne, NULL);   
	if (ret != 1)   { 
		printf("RSA_generate_key_ex err!\n");    
		return -1; 
	}   
	RSA_free(r);   
	return 0;  
}