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/*
* (C) 2009 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_TESTS_FIXED_RNG_H__
#define BOTAN_TESTS_FIXED_RNG_H__
#include "tests.h"
#include <deque>
#include <string>
#include <botan/rng.h>
#include <botan/hex.h>
namespace Botan_Tests {
class Fixed_Output_RNG : public Botan::RandomNumberGenerator
{
public:
bool is_seeded() const override { return !m_buf.empty(); }
uint8_t random()
{
if(!is_seeded())
throw Test_Error("Fixed output RNG ran out of bytes, test bug?");
uint8_t out = m_buf.front();
m_buf.pop_front();
return out;
}
size_t reseed_with_sources(Botan::Entropy_Sources&,
size_t,
std::chrono::milliseconds) override { return 0; }
void randomize(uint8_t out[], size_t len) override
{
for(size_t j = 0; j != len; j++)
out[j] = random();
}
void add_entropy(const uint8_t b[], size_t s) override
{
m_buf.insert(m_buf.end(), b, b + s);
}
std::string name() const override { return "Fixed_Output_RNG"; }
void clear() throw() override {}
Fixed_Output_RNG(const std::vector<uint8_t>& in)
{
m_buf.insert(m_buf.end(), in.begin(), in.end());
}
Fixed_Output_RNG(const std::string& in_str)
{
std::vector<uint8_t> in = Botan::hex_decode(in_str);
m_buf.insert(m_buf.end(), in.begin(), in.end());
}
Fixed_Output_RNG() {}
protected:
size_t remaining() const { return m_buf.size(); }
private:
std::deque<uint8_t> m_buf;
};
}
#endif
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