Crypto++  8.1
Free C++ class library of cryptographic schemes
xtrcrypt.h
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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 
12 NAMESPACE_BEGIN(CryptoPP)
13 
14 /// \brief XTR-DH with key validation
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);
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
Abstract base classes that provide a uniform interface to this library.
Interface for random number generators.
Definition: cryptlib.h:1383
unsigned int AgreedValueLength() const
Provides the size of the agreed value.
Definition: xtrcrypt.h:30
Interface for buffered transformations.
Definition: cryptlib.h:1598
Interface for domains of simple key agreement protocols.
Definition: cryptlib.h:2897
an element of GF(p^2)
Definition: xtr.h:16
XTR-DH with key validation.
Definition: xtrcrypt.h:15
CryptoParameters & AccessCryptoParameters()
Retrieves a reference to Crypto Parameters.
Definition: xtrcrypt.h:29
The XTR public key system.
Multiple precision integer with arithmetic operations.
Definition: integer.h:49
unsigned int PublicKeyLength() const
Provides the size of the public key.
Definition: xtrcrypt.h:32
unsigned int PrivateKeyLength() const
Provides the size of the private key.
Definition: xtrcrypt.h:31
Multiple precision integer with arithmetic operations.
Interface for crypto prameters.
Definition: cryptlib.h:2435
Crypto++ library namespace.
Interface for retrieving values given their names.
Definition: cryptlib.h:293