/* * Blinding for public key operations * (C) 1999-2010 Jack Lloyd * * Botan is released under the Simplified BSD License (see license.txt) */ #ifndef BOTAN_BLINDER_H__ #define BOTAN_BLINDER_H__ #include #include 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