#include <cstdio>
#include <cstdlib>
using namespace std;

char* md5(char* str)
{
	char cmd[500];
	sprintf(cmd, "echo -n \"%s\" | md5sum", str);
	FILE *fd = popen(cmd, "r");
	char *hash = (char*)malloc(sizeof(char) * 33);
	hash[32] = NULL;
	fread(hash, sizeof(char), 32, fd);
	pclose(fd);
	
	return hash;
}

int main()
{
	printf("MD5 of HelloWorld: %s\n", md5("HelloWorld"));
}