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/*************************************************
* Device EntropySource Header File *
* (C) 1999-2007 Jack Lloyd *
*************************************************/
#ifndef BOTAN_ENTROPY_SRC_DEVICE_H__
#define BOTAN_ENTROPY_SRC_DEVICE_H__
#include <botan/entropy_src.h>
#include <vector>
#include <string>
namespace Botan {
/*************************************************
* Device Based Entropy Source *
*************************************************/
class BOTAN_DLL Device_EntropySource : public EntropySource
{
public:
std::string name() const { return "RNG Device Reader"; }
Device_EntropySource(const std::vector<std::string>& fsnames);
~Device_EntropySource();
u32bit slow_poll(byte[], u32bit);
u32bit fast_poll(byte[], u32bit);
private:
/**
A class handling reading from a Unix character device
*/
class Device_Reader
{
public:
typedef int fd_type;
// Does not own fd, a transient class
Device_Reader(fd_type device_fd) : fd(device_fd) {}
void close();
u32bit get(byte out[], u32bit length, u32bit ms_wait_time);
static fd_type open(const std::string& pathname);
private:
fd_type fd;
};
std::vector<Device_Reader> devices;
};
}
#endif
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