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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>
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();
}
bool accepts_input() const override { return true; }
size_t reseed(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() noexcept 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(RandomNumberGenerator& rng, size_t len)
{
std::vector<uint8_t> output;
rng.random_vec(output, len);
m_buf.insert(m_buf.end(), output.begin(), output.end());
}
Fixed_Output_RNG() = default;
protected:
uint8_t random()
{
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;
}
private:
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 final : public Fixed_Output_RNG
{
public:
bool is_seeded() const override
{
return Fixed_Output_RNG::is_seeded() || Test::rng().is_seeded();
}
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
Test::rng().randomize(out, len);
}
}
bool accepts_input() const override { return false; }
void add_entropy(const uint8_t*, size_t) override
{
throw Test_Error("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, size_t pos)
: Fixed_Output_RNG(in)
, m_pos(pos) {}
explicit Fixed_Output_Position_RNG(const std::string& in_str, size_t pos)
: Fixed_Output_RNG(in_str)
, m_pos(pos) {}
private:
size_t m_pos = 0;
size_t m_requests = 0;
};
class SeedCapturing_RNG final : public Botan::RandomNumberGenerator
{
public:
void randomize(uint8_t[], size_t) override
{
throw Test_Error("SeedCapturing_RNG has no output");
}
bool accepts_input() const override { return true; }
void add_entropy(const uint8_t 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;
};
/*
* RNG that counts the number of requests made to it, for example
* to verify that a reseed attempt was made at the expected time.
*/
class Request_Counting_RNG final : public Botan::RandomNumberGenerator
{
public:
Request_Counting_RNG() : m_randomize_count(0) {}
size_t randomize_count() const
{
return m_randomize_count;
}
bool accepts_input() const override { return false; }
bool is_seeded() const override
{
return true;
}
void clear() override
{
m_randomize_count = 0;
}
void randomize(uint8_t out[], size_t out_len) override
{
/*
The HMAC_DRBG and ChaCha reseed KATs assume this RNG type
outputs all 0x80
*/
for(size_t i = 0; i != out_len; ++i)
out[i] = 0x80;
m_randomize_count++;
}
void add_entropy(const uint8_t[], size_t) override {}
std::string name() const override
{
return "Request_Counting_RNG";
}
private:
size_t m_randomize_count;
};
}
#endif
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