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/*
* Blinding for public key operations
* (C) 1999-2010,2015 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_BLINDER_H__
#define BOTAN_BLINDER_H__
#include <botan/bigint.h>
#include <botan/reducer.h>
#include <functional>
namespace Botan {
class RandomNumberGenerator;
/**
* Blinding Function Object
*/
class BOTAN_DLL Blinder
{
public:
BigInt blind(const BigInt& x) const;
BigInt unblind(const BigInt& x) const;
Blinder(const BigInt& modulus,
RandomNumberGenerator& rng,
std::function<BigInt (const BigInt&)> fwd_func,
std::function<BigInt (const BigInt&)> inv_func);
Blinder(const Blinder&) = delete;
Blinder& operator=(const Blinder&) = delete;
private:
BigInt blinding_nonce() const;
Modular_Reducer m_reducer;
RandomNumberGenerator& m_rng;
std::function<BigInt (const BigInt&)> m_fwd_fn;
std::function<BigInt (const BigInt&)> m_inv_fn;
size_t m_modulus_bits = 0;
mutable BigInt m_e, m_d;
mutable size_t m_counter = 0;
};
}
#endif
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