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/*
* PKCS#11 Random Generator
* (C) 2016 Daniel Neus, Sirrix AG
* (C) 2016 Philipp Weber, Sirrix AG
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_P11_RNG_H__
#define BOTAN_P11_RNG_H__
#include <botan/rng.h>
#include <botan/p11_session.h>
#include <botan/entropy_src.h>
#include <string>
#include <functional>
namespace Botan {
namespace PKCS11 {
class Module;
/// A random generator that only fetches random from the PKCS#11 RNG
class BOTAN_DLL PKCS11_RNG final : public RandomNumberGenerator
{
public:
/// Initialize the RNG with the PKCS#11 session that provides access to the cryptoki functions
explicit PKCS11_RNG(Session& session);
void clear() override
{}
std::string name() const override
{
return "PKCS11_RNG";
}
/// Always returns true
bool is_seeded() const override
{
return true;
}
/// No operation - always returns 0
size_t reseed_with_sources(Entropy_Sources&, size_t, std::chrono::milliseconds) override
{
return 0;
}
/// @return the module used by this RNG
inline Module& module() const
{
return m_session.get().module();
}
/// Calls `C_GenerateRandom` to generate random data
void randomize(Botan::byte output[], std::size_t length) override;
/// Calls `C_SeedRandom` to add entropy to the random generation function of the token/middleware
void add_entropy(const Botan::byte in[], std::size_t length) override;
private:
const std::reference_wrapper<Session> m_session;
};
}
}
#endif
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