rw.h

Go to the documentation of this file.

#ifndef CRYPTOPP_RW_H
#define CRYPTOPP_RW_H

/** \file
        This file contains classes that implement the
        Rabin-Williams signature schemes as defined in IEEE P1363.
*/

#include "pubkey.h"

NAMESPACE_BEGIN(CryptoPP)

//! _
class CRYPTOPP_DLL RWFunction : public TrapdoorFunction, public PublicKey
{
        typedef RWFunction ThisClass;

public:
        void Initialize(const Integer &n)
                {m_n = n;}

        void BERDecode(BufferedTransformation &bt);
        void DEREncode(BufferedTransformation &bt) const;

        Integer ApplyFunction(const Integer &x) const;
        Integer PreimageBound() const {return ++(m_n>>1);}
        Integer ImageBound() const {return m_n;}

        bool Validate(RandomNumberGenerator &rng, unsigned int level) const;
        bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const;
        void AssignFrom(const NameValuePairs &source);

        const Integer& GetModulus() const {return m_n;}
        void SetModulus(const Integer &n) {m_n = n;}

protected:
        Integer m_n;
};

//! _
class CRYPTOPP_DLL InvertibleRWFunction : public RWFunction, public TrapdoorFunctionInverse, public PrivateKey
{
        typedef InvertibleRWFunction ThisClass;

public:
        void Initialize(const Integer &n, const Integer &p, const Integer &q, const Integer &u)
                {m_n = n; m_p = p; m_q = q; m_u = u;}
        // generate a random private key
        void Initialize(RandomNumberGenerator &rng, unsigned int modulusBits)
                {GenerateRandomWithKeySize(rng, modulusBits);}

        void BERDecode(BufferedTransformation &bt);
        void DEREncode(BufferedTransformation &bt) const;

        Integer CalculateInverse(RandomNumberGenerator &rng, const Integer &x) const;

        // GeneratibleCryptoMaterial
        bool Validate(RandomNumberGenerator &rng, unsigned int level) const;
        bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const;
        void AssignFrom(const NameValuePairs &source);
        /*! parameters: (ModulusSize) */
        void GenerateRandom(RandomNumberGenerator &rng, const NameValuePairs &alg);

        const Integer& GetPrime1() const {return m_p;}
        const Integer& GetPrime2() const {return m_q;}
        const Integer& GetMultiplicativeInverseOfPrime2ModPrime1() const {return m_u;}

        void SetPrime1(const Integer &p) {m_p = p;}
        void SetPrime2(const Integer &q) {m_q = q;}
        void SetMultiplicativeInverseOfPrime2ModPrime1(const Integer &u) {m_u = u;}

protected:
        Integer m_p, m_q, m_u;
};

//! RW
struct RW
{
        static std::string StaticAlgorithmName() {return "RW";}
        typedef RWFunction PublicKey;
        typedef InvertibleRWFunction PrivateKey;
};

//! RWSS
template <class STANDARD, class H>
struct RWSS : public TF_SS<STANDARD, H, RW>
{
};

NAMESPACE_END

#endif

---