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/*
* Blinding for public key operations
* (C) 1999-2010 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_BLINDER_H__
#define BOTAN_BLINDER_H__
#include <botan/bigint.h>
#include <botan/reducer.h>
namespace Botan {
/*
* Blinding Function Object
*/
class BOTAN_DLL Blinder
{
public:
BigInt blind(const BigInt& x) const;
BigInt unblind(const BigInt& x) const;
/**
* Choose a nonce to use for blinding
* @param x a secret seed value
* @param mod the modulus
*/
static BigInt choose_nonce(const BigInt& x, const BigInt& mod);
Blinder() {}
/**
* Construct a blinder
* @param mask the forward (blinding) mask
* @param inverse_mask the inverse of mask (depends on algo)
* @param modulus of the group operations are performed in
*/
Blinder(const BigInt& mask,
const BigInt& inverse_mask,
const BigInt& modulus);
private:
Modular_Reducer reducer;
mutable BigInt e, d;
};
}
#endif
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