1 #ifndef CRYPTOPP_XTRCRYPT_H
2 #define CRYPTOPP_XTRCRYPT_H
3
4 /// \file
5 /// \brief XTR public key system
6 /// \sa "The XTR public key system" by Arjen K. Lenstra and Eric R. Verheul
7
8 #include "cryptlib.h"
9 #include "xtr.h"
10 #include "integer.h"
11
NAMESPACE_BEGIN(CryptoPP)12 NAMESPACE_BEGIN(CryptoPP)
13
14 /// \brief XTR-DH with key validation
15 class XTR_DH : public SimpleKeyAgreementDomain, public CryptoParameters
16 {
17 typedef XTR_DH ThisClass;
18
19 public:
20 XTR_DH(const Integer &p, const Integer &q, const GFP2Element &g);
21 XTR_DH(RandomNumberGenerator &rng, unsigned int pbits, unsigned int qbits);
22 XTR_DH(BufferedTransformation &domainParams);
23
24 void DEREncode(BufferedTransformation &domainParams) const;
25
26 bool Validate(RandomNumberGenerator &rng, unsigned int level) const;
27 bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const;
28 void AssignFrom(const NameValuePairs &source);
29 CryptoParameters & AccessCryptoParameters() {return *this;}
30 unsigned int AgreedValueLength() const {return 2*m_p.ByteCount();}
31 unsigned int PrivateKeyLength() const {return m_q.ByteCount();}
32 unsigned int PublicKeyLength() const {return 2*m_p.ByteCount();}
33
34 void GeneratePrivateKey(RandomNumberGenerator &rng, byte *privateKey) const;
35 void GeneratePublicKey(RandomNumberGenerator &rng, const byte *privateKey, byte *publicKey) const;
36 bool Agree(byte *agreedValue, const byte *privateKey, const byte *otherPublicKey, bool validateOtherPublicKey=true) const;
37
38 const Integer &GetModulus() const {return m_p;}
39 const Integer &GetSubgroupOrder() const {return m_q;}
40 const GFP2Element &GetSubgroupGenerator() const {return m_g;}
41
42 void SetModulus(const Integer &p) {m_p = p;}
43 void SetSubgroupOrder(const Integer &q) {m_q = q;}
44 void SetSubgroupGenerator(const GFP2Element &g) {m_g = g;}
45
46 private:
47 unsigned int ExponentBitLength() const;
48
49 Integer m_p, m_q;
50 GFP2Element m_g;
51 };
52
53 NAMESPACE_END
54
55 #endif
56