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/*
* (C) 2009 Jack Lloyd
* (C) 2016 René Korthaus, Sirrix AG
*
* 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>
#include <botan/exceptn.h>
#if defined(BOTAN_HAS_SYSTEM_RNG)
#include <botan/system_rng.h>
#else
#include <botan/auto_rng.h>
#endif
namespace Botan_Tests {
/**
* RNG that outputs only a given set of fixed bytes, throws otherwise.
* Useful for test vectors with fixed nonces, where the algorithm consumes only the fixed nonce.
*/
class Fixed_Output_RNG : public Botan::RandomNumberGenerator
{
public:
bool is_seeded() const override { return !m_buf.empty(); }
virtual 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 {}
explicit Fixed_Output_RNG(const std::vector<uint8_t>& in)
{
m_buf.insert(m_buf.end(), in.begin(), in.end());
}
explicit 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(); }
std::deque<uint8_t> m_buf;
};
/**
* RNG that outputs a given set of fixed bytes for a specific request count, outputs random otherwise.
* Useful for test vectors with fixed nonces, where the algorithm consumes more random than just the fixed nonce.
*/
class Fixed_Output_Position_RNG : public Fixed_Output_RNG
{
public:
bool is_seeded() const override { return !m_buf.empty() || m_rng->is_seeded(); }
uint8_t random() override
{
if(m_buf.empty())
{
throw Test_Error("Fixed output RNG ran out of bytes, test bug?");
}
uint8_t out = m_buf.front();
m_buf.pop_front();
return out;
}
void randomize(uint8_t out[], size_t len) override
{
++m_requests;
if(m_requests == m_pos)
{ // return fixed output
for(size_t j = 0; j != len; j++)
{
out[j] = random();
}
}
else
{ // return random
m_rng->randomize(out,len);
}
}
void add_entropy(const uint8_t*, size_t) override
{
throw Botan::Exception("add_entropy() not supported by this RNG, test bug?");
}
std::string name() const override { return "Fixed_Output_Position_RNG"; }
explicit Fixed_Output_Position_RNG(const std::vector<uint8_t>& in, uint32_t pos) :
Fixed_Output_RNG(in),
m_pos(pos),
m_rng{}
{
#if defined(BOTAN_HAS_SYSTEM_RNG)
m_rng.reset(new Botan::System_RNG);
#else
m_rng.reset(new Botan::AutoSeeded_RNG);
#endif
}
explicit Fixed_Output_Position_RNG(const std::string& in_str, uint32_t pos) :
Fixed_Output_RNG(in_str),
m_pos(pos),
m_rng{}
{
#if defined(BOTAN_HAS_SYSTEM_RNG)
m_rng.reset(new Botan::System_RNG);
#else
m_rng.reset(new Botan::AutoSeeded_RNG);
#endif
}
private:
uint32_t m_pos = 0;
uint32_t m_requests = 0;
std::unique_ptr<RandomNumberGenerator> m_rng;
};
class SeedCapturing_RNG : public Botan::RandomNumberGenerator
{
public:
void randomize(uint8_t[], size_t) override
{ throw Botan::Exception("SeedCapturing_RNG has no output"); }
void add_entropy(const byte input[], size_t len) override
{
m_samples++;
m_seed.insert(m_seed.end(), input, input + len);
}
void clear() override {}
bool is_seeded() const override { return false; }
std::string name() const override { return "SeedCapturing"; }
size_t samples() const { return m_samples; }
const std::vector<uint8_t>& seed_material() const { return m_seed; }
private:
std::vector<uint8_t> m_seed;
size_t m_samples = 0;
};
}
#endif
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