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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
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