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#ifndef BOTAN_TESTS_FIXED_RNG_H__
#define BOTAN_TESTS_FIXED_RNG_H__
#include <deque>
#include <string>
#include <stdexcept>
#include <botan/rng.h>
#include <botan/hex.h>
using Botan::byte;
class Fixed_Output_RNG : public Botan::RandomNumberGenerator
{
public:
bool is_seeded() const { return !buf.empty(); }
byte random()
{
if(!is_seeded())
throw std::runtime_error("Out of bytes");
byte out = buf.front();
buf.pop_front();
return out;
}
void reseed(size_t) {}
void randomize(byte out[], size_t len)
{
for(size_t j = 0; j != len; j++)
out[j] = random();
}
void add_entropy(const byte b[], size_t s)
{
buf.insert(buf.end(), b, b + s);
}
std::string name() const { return "Fixed_Output_RNG"; }
void clear() throw() {}
Fixed_Output_RNG(const std::vector<byte>& in)
{
buf.insert(buf.end(), in.begin(), in.end());
}
Fixed_Output_RNG(const std::string& in_str)
{
std::vector<byte> in = Botan::hex_decode(in_str);
buf.insert(buf.end(), in.begin(), in.end());
}
Fixed_Output_RNG() {}
private:
std::deque<byte> buf;
};
#endif
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