blinding.h

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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;
 
      bool initialized() const { return reducer.initialized(); }
 
      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