xtrcrypt.h

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00001 #ifndef CRYPTOPP_XTRCRYPT_H
00002 #define CRYPTOPP_XTRCRYPT_H
00003 
00004 /** \file
00005     "The XTR public key system" by Arjen K. Lenstra and Eric R. Verheul
00006 */
00007 
00008 #include "xtr.h"
00009 
00010 NAMESPACE_BEGIN(CryptoPP)
00011 
00012 //! XTR-DH with key validation
00013 
00014 class XTR_DH : public SimpleKeyAgreementDomain, public CryptoParameters
00015 {
00016     typedef XTR_DH ThisClass;
00017     
00018 public:
00019     XTR_DH(const Integer &p, const Integer &q, const GFP2Element &g);
00020     XTR_DH(RandomNumberGenerator &rng, unsigned int pbits, unsigned int qbits);
00021     XTR_DH(BufferedTransformation &domainParams);
00022 
00023     void DEREncode(BufferedTransformation &domainParams) const;
00024 
00025     bool Validate(RandomNumberGenerator &rng, unsigned int level) const;
00026     bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const;
00027     void AssignFrom(const NameValuePairs &source);
00028     CryptoParameters & AccessCryptoParameters() {return *this;}
00029     unsigned int AgreedValueLength() const {return 2*m_p.ByteCount();}
00030     unsigned int PrivateKeyLength() const {return m_q.ByteCount();}
00031     unsigned int PublicKeyLength() const {return 2*m_p.ByteCount();}
00032 
00033     void GeneratePrivateKey(RandomNumberGenerator &rng, byte *privateKey) const;
00034     void GeneratePublicKey(RandomNumberGenerator &rng, const byte *privateKey, byte *publicKey) const;
00035     bool Agree(byte *agreedValue, const byte *privateKey, const byte *otherPublicKey, bool validateOtherPublicKey=true) const;
00036 
00037     const Integer &GetModulus() const {return m_p;}
00038     const Integer &GetSubgroupOrder() const {return m_q;}
00039     const GFP2Element &GetSubgroupGenerator() const {return m_g;}
00040 
00041     void SetModulus(const Integer &p) {m_p = p;}
00042     void SetSubgroupOrder(const Integer &q) {m_q = q;}
00043     void SetSubgroupGenerator(const GFP2Element &g) {m_g = g;}
00044 
00045 private:
00046     unsigned int ExponentBitLength() const;
00047 
00048     Integer m_p, m_q;
00049     GFP2Element m_g;
00050 };
00051 
00052 NAMESPACE_END
00053 
00054 #endif

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