xtrcrypt.h

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#ifndef CRYPTOPP_XTRCRYPT_H
#define CRYPTOPP_XTRCRYPT_H
 
/// \file
/// \brief XTR public key system
/// \sa  "The XTR public key system" by Arjen K. Lenstra and Eric R. Verheul
 
#include "cryptlib.h"
#include "xtr.h"
#include "integer.h"
 
NAMESPACE_BEGIN(CryptoPP)
 
/// \brief XTR-DH with key validation
class XTR_DH : public SimpleKeyAgreementDomain, public CryptoParameters
{
    typedef XTR_DH ThisClass;
 
public:
    XTR_DH(const Integer &p, const Integer &q, const GFP2Element &g);
    XTR_DH(RandomNumberGenerator &rng, unsigned int pbits, unsigned int qbits);
    XTR_DH(BufferedTransformation &domainParams);
 
    void DEREncode(BufferedTransformation &domainParams) 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);
    CryptoParameters & AccessCryptoParameters() {return *this;}
    unsigned int AgreedValueLength() const {return 2*m_p.ByteCount();}
    unsigned int PrivateKeyLength() const {return m_q.ByteCount();}
    unsigned int PublicKeyLength() const {return 2*m_p.ByteCount();}
 
    void GeneratePrivateKey(RandomNumberGenerator &rng, byte *privateKey) const;
    void GeneratePublicKey(RandomNumberGenerator &rng, const byte *privateKey, byte *publicKey) const;
    bool Agree(byte *agreedValue, const byte *privateKey, const byte *otherPublicKey, bool validateOtherPublicKey=true) const;
 
    const Integer &GetModulus() const {return m_p;}
    const Integer &GetSubgroupOrder() const {return m_q;}
    const GFP2Element &GetSubgroupGenerator() const {return m_g;}
 
    void SetModulus(const Integer &p) {m_p = p;}
    void SetSubgroupOrder(const Integer &q) {m_q = q;}
    void SetSubgroupGenerator(const GFP2Element &g) {m_g = g;}
 
private:
    unsigned int ExponentBitLength() const;
 
    Integer m_p, m_q;
    GFP2Element m_g;
};
 
NAMESPACE_END
 
#endif