/*
   Copyright (c)  2014 IOnU Security Inc. All rights reserved
   Created February 2014 by Kendrick Webster
 
   Random.h - header for random number generator
*/
#pragma once
#include <stdint.h>
#include <string>

/*
   Simple/fast 'random' number source based on an entropy pool seeded by high-resolution
   timestamps.  SeedRandom() should be called by I/O functions, event loops, etc.
*/
namespace ionu { namespace random {
    
// get <n> 'random' bytes from this module's RNG
void GetRandom(void* p, size_t n);

// fill <v> with random bytes
template<typename T>
void Random(T& v) {GetRandom(&v, sizeof(v));}

// adds entropy to pool by hashing a high-resolution timestamp
void SeedRandom(void);

// returns a hexadecimal string representing the last seed hashed by SeedRandom()
std::string GetLastSeedAsString(void);

// returns a random base64 string of length <n>,
// uses '_' and '-' as the two non-alnum chars (see b64char() in Hash.hpp)
std::string GetRandomString(size_t n);
    
}}