luc.h

Go to the documentation of this file.

// luc.h - written and placed in the public domain by Wei Dai


#ifndef CRYPTOPP_LUC_H
#define CRYPTOPP_LUC_H

#include "cryptlib.h"
#include "gfpcrypt.h"
#include "integer.h"
#include "algebra.h"
#include "secblock.h"

#if CRYPTOPP_MSC_VERSION
# pragma warning(push)
# pragma warning(disable: 4127 4189)
#endif

#include "pkcspad.h"
#include "integer.h"
#include "oaep.h"
#include "dh.h"

#include <limits.h>

NAMESPACE_BEGIN(CryptoPP)

class LUCFunction : public TrapdoorFunction, public PublicKey
{
        typedef LUCFunction ThisClass;

public:
        virtual ~LUCFunction() {}

        void Initialize(const Integer &n, const Integer &e)
                {m_n = n; m_e = e;}

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

        Integer ApplyFunction(const Integer &x) const;
        Integer PreimageBound() const {return m_n;}
        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);

        // non-derived interface
        const Integer & GetModulus() const {return m_n;}
        const Integer & GetPublicExponent() const {return m_e;}

        void SetModulus(const Integer &n) {m_n = n;}
        void SetPublicExponent(const Integer &e) {m_e = e;}

protected:
        Integer m_n, m_e;
};

class InvertibleLUCFunction : public LUCFunction, public TrapdoorFunctionInverse, public PrivateKey
{
        typedef InvertibleLUCFunction ThisClass;

public:
        virtual ~InvertibleLUCFunction() {}

        void Initialize(RandomNumberGenerator &rng, unsigned int modulusBits, const Integer &eStart=17);

        void Initialize(const Integer &n, const Integer &e, const Integer &p, const Integer &q, const Integer &u)
                {m_n = n; m_e = e; m_p = p; m_q = q; m_u = u;}

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

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

        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);
        void GenerateRandom(RandomNumberGenerator &rng, const NameValuePairs &alg);

        // non-derived interface
        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;
};

struct LUC
{
        static std::string StaticAlgorithmName() {return "LUC";}
        typedef LUCFunction PublicKey;
        typedef InvertibleLUCFunction PrivateKey;
};

template <class STANDARD>
struct LUCES : public TF_ES<LUC, STANDARD>
{
};

template <class STANDARD, class H>
struct LUCSS : public TF_SS<LUC, STANDARD, H>
{
};

// analogous to the RSA schemes defined in PKCS #1 v2.0
typedef LUCES<OAEP<SHA> >::Decryptor LUCES_OAEP_SHA_Decryptor;
typedef LUCES<OAEP<SHA> >::Encryptor LUCES_OAEP_SHA_Encryptor;

typedef LUCSS<PKCS1v15, SHA>::Signer LUCSSA_PKCS1v15_SHA_Signer;
typedef LUCSS<PKCS1v15, SHA>::Verifier LUCSSA_PKCS1v15_SHA_Verifier;

// ********************************************************

// no actual precomputation
class DL_GroupPrecomputation_LUC : public DL_GroupPrecomputation<Integer>
{
public:
        virtual ~DL_GroupPrecomputation_LUC() {}

        const AbstractGroup<Element> & GetGroup() const {CRYPTOPP_ASSERT(false); throw 0;}
        Element BERDecodeElement(BufferedTransformation &bt) const {return Integer(bt);}
        void DEREncodeElement(BufferedTransformation &bt, const Element &v) const {v.DEREncode(bt);}

        // non-inherited
        void SetModulus(const Integer &v) {m_p = v;}
        const Integer & GetModulus() const {return m_p;}

private:
        Integer m_p;
};

class DL_BasePrecomputation_LUC : public DL_FixedBasePrecomputation<Integer>
{
public:
        virtual ~DL_BasePrecomputation_LUC() {}

        // DL_FixedBasePrecomputation
        bool IsInitialized() const {return m_g.NotZero();}
        void SetBase(const DL_GroupPrecomputation<Element> &group, const Integer &base)
                {CRYPTOPP_UNUSED(group); m_g = base;}
        const Integer & GetBase(const DL_GroupPrecomputation<Element> &group) const
                {CRYPTOPP_UNUSED(group); return m_g;}
        void Precompute(const DL_GroupPrecomputation<Element> &group, unsigned int maxExpBits, unsigned int storage)
                {CRYPTOPP_UNUSED(group); CRYPTOPP_UNUSED(maxExpBits); CRYPTOPP_UNUSED(storage);}
        void Load(const DL_GroupPrecomputation<Element> &group, BufferedTransformation &storedPrecomputation)
                {CRYPTOPP_UNUSED(group); CRYPTOPP_UNUSED(storedPrecomputation);}
        void Save(const DL_GroupPrecomputation<Element> &group, BufferedTransformation &storedPrecomputation) const
                {CRYPTOPP_UNUSED(group); CRYPTOPP_UNUSED(storedPrecomputation);}
        Integer Exponentiate(const DL_GroupPrecomputation<Element> &group, const Integer &exponent) const;
        Integer CascadeExponentiate(const DL_GroupPrecomputation<Element> &group, const Integer &exponent, const DL_FixedBasePrecomputation<Integer> &pc2, const Integer &exponent2) const
                {
                        CRYPTOPP_UNUSED(group); CRYPTOPP_UNUSED(exponent); CRYPTOPP_UNUSED(pc2); CRYPTOPP_UNUSED(exponent2);
                        // shouldn't be called
                        throw NotImplemented("DL_BasePrecomputation_LUC: CascadeExponentiate not implemented");
                }

private:
        Integer m_g;
};

class DL_GroupParameters_LUC : public DL_GroupParameters_IntegerBasedImpl<DL_GroupPrecomputation_LUC, DL_BasePrecomputation_LUC>
{
public:
        virtual ~DL_GroupParameters_LUC() {}

        // DL_GroupParameters
        bool IsIdentity(const Integer &element) const {return element == Integer::Two();}
        void SimultaneousExponentiate(Element *results, const Element &base, const Integer *exponents, unsigned int exponentsCount) const;
        Element MultiplyElements(const Element &a, const Element &b) const
        {
                CRYPTOPP_UNUSED(a); CRYPTOPP_UNUSED(b);
                throw NotImplemented("LUC_GroupParameters: MultiplyElements can not be implemented");
        }
        Element CascadeExponentiate(const Element &element1, const Integer &exponent1, const Element &element2, const Integer &exponent2) const
        {
                CRYPTOPP_UNUSED(element1); CRYPTOPP_UNUSED(exponent1); CRYPTOPP_UNUSED(element2); CRYPTOPP_UNUSED(exponent2);
                throw NotImplemented("LUC_GroupParameters: MultiplyElements can not be implemented");
        }

        // NameValuePairs interface
        bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const
        {
                return GetValueHelper<DL_GroupParameters_IntegerBased>(this, name, valueType, pValue).Assignable();
        }

private:
        int GetFieldType() const {return 2;}
};

class DL_GroupParameters_LUC_DefaultSafePrime : public DL_GroupParameters_LUC
{
public:
        typedef NoCofactorMultiplication DefaultCofactorOption;

protected:
        unsigned int GetDefaultSubgroupOrderSize(unsigned int modulusSize) const {return modulusSize-1;}
};

class DL_Algorithm_LUC_HMP : public DL_ElgamalLikeSignatureAlgorithm<Integer>
{
public:
        CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "LUC-HMP";}

        virtual ~DL_Algorithm_LUC_HMP() {}

        void Sign(const DL_GroupParameters<Integer> &params, const Integer &x, const Integer &k, const Integer &e, Integer &r, Integer &s) const;
        bool Verify(const DL_GroupParameters<Integer> &params, const DL_PublicKey<Integer> &publicKey, const Integer &e, const Integer &r, const Integer &s) const;

        size_t RLen(const DL_GroupParameters<Integer> &params) const
                {return params.GetGroupOrder().ByteCount();}
};

struct DL_SignatureKeys_LUC
{
        typedef DL_GroupParameters_LUC GroupParameters;
        typedef DL_PublicKey_GFP<GroupParameters> PublicKey;
        typedef DL_PrivateKey_GFP<GroupParameters> PrivateKey;
};

template <class H>
struct LUC_HMP : public DL_SS<DL_SignatureKeys_LUC, DL_Algorithm_LUC_HMP, DL_SignatureMessageEncodingMethod_DSA, H>
{
};

struct DL_CryptoKeys_LUC
{
        typedef DL_GroupParameters_LUC_DefaultSafePrime GroupParameters;
        typedef DL_PublicKey_GFP<GroupParameters> PublicKey;
        typedef DL_PrivateKey_GFP<GroupParameters> PrivateKey;
};

template <class HASH = SHA1, class COFACTOR_OPTION = NoCofactorMultiplication, bool DHAES_MODE = true, bool LABEL_OCTETS = false>
struct LUC_IES
        : public DL_ES<
                DL_CryptoKeys_LUC,
                DL_KeyAgreementAlgorithm_DH<Integer, COFACTOR_OPTION>,
                DL_KeyDerivationAlgorithm_P1363<Integer, DHAES_MODE, P1363_KDF2<HASH> >,
                DL_EncryptionAlgorithm_Xor<HMAC<HASH>, DHAES_MODE, LABEL_OCTETS>,
                LUC_IES<> >
{
        CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "LUC-IES";} // non-standard name
};

// ********************************************************

typedef DH_Domain<DL_GroupParameters_LUC_DefaultSafePrime> LUC_DH;

NAMESPACE_END

#if CRYPTOPP_MSC_VERSION
# pragma warning(pop)
#endif

#endif