00001 #ifndef CRYPTOPP_MODEXPPC_H
00002 #define CRYPTOPP_MODEXPPC_H
00003
00004 #include "modarith.h"
00005 #include "eprecomp.h"
00006 #include "smartptr.h"
00007 #include "pubkey.h"
00008
00009 NAMESPACE_BEGIN(CryptoPP)
00010
00011 class ModExpPrecomputation : public DL_GroupPrecomputation<Integer>
00012 {
00013 public:
00014
00015 bool NeedConversions() const {return true;}
00016 Element ConvertIn(const Element &v) const {return m_mr->ConvertIn(v);}
00017 virtual Element ConvertOut(const Element &v) const {return m_mr->ConvertOut(v);}
00018 const AbstractGroup<Element> & GetGroup() const {return m_mr->MultiplicativeGroup();}
00019 Element BERDecodeElement(BufferedTransformation &bt) const {return Integer(bt);}
00020 void DEREncodeElement(BufferedTransformation &bt, const Element &v) const {v.DEREncode(bt);}
00021
00022
00023 void SetModulus(const Integer &v) {m_mr.reset(new MontgomeryRepresentation(v));}
00024 const Integer & GetModulus() const {return m_mr->GetModulus();}
00025
00026 private:
00027 value_ptr<MontgomeryRepresentation> m_mr;
00028 };
00029
00030 NAMESPACE_END
00031
00032 #endif