/* * Copyright (c) 2002 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This Original Code and all software distributed under the License are * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ */ #ifndef CRYPTOPP_EPRECOMP_H #define CRYPTOPP_EPRECOMP_H #include "integer.h" #include "algebra.h" #include <vector> NAMESPACE_BEGIN(CryptoPP) /** Please do not directly use the following class. It should be considered a private class for the library. The following classes are public and use ExponentiationPrecomputation internally. <br><br> ModExpPrecomputation; <br> EcPrecomputation<EC2N>; <br> EcPrecomputation<ECP>; */ template <class T> class ExponentiationPrecomputation { public: typedef T Element; typedef AbstractGroup<T> Group; ExponentiationPrecomputation() : m_group(NULL) {} void SetGroupAndBase(const Group &group, const Element &base); void Precompute(unsigned int maxExpBits, unsigned int storage); void PrepareCascade(std::vector<BaseAndExponent<Element> > &eb, const Integer &exponent) const; Element Exponentiate(const Integer &exponent) const; Element CascadeExponentiate(const Integer &exponent, const ExponentiationPrecomputation<T> &pc2, const Integer &exponent2) const; const Group *m_group; unsigned int m_windowSize; Integer m_exponentBase; // what base to represent the exponent in std::vector<Element> m_bases; // precalculated bases }; NAMESPACE_END #endif