Crypto++
xtrcrypt.h
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1 #ifndef CRYPTOPP_XTRCRYPT_H
2 #define CRYPTOPP_XTRCRYPT_H
3 
4 /** \file
5  "The XTR public key system" by Arjen K. Lenstra and Eric R. Verheul
6 */
7 
8 #include "xtr.h"
9 
10 NAMESPACE_BEGIN(CryptoPP)
11 
12 //! XTR-DH with key validation
13 
15 {
16  typedef XTR_DH ThisClass;
17 
18 public:
19  XTR_DH(const Integer &p, const Integer &q, const GFP2Element &g);
20  XTR_DH(RandomNumberGenerator &rng, unsigned int pbits, unsigned int qbits);
21  XTR_DH(BufferedTransformation &domainParams);
22 
23  void DEREncode(BufferedTransformation &domainParams) const;
24 
25  bool Validate(RandomNumberGenerator &rng, unsigned int level) const;
26  bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const;
27  void AssignFrom(const NameValuePairs &source);
28  CryptoParameters & AccessCryptoParameters() {return *this;}
29  unsigned int AgreedValueLength() const {return 2*m_p.ByteCount();}
30  unsigned int PrivateKeyLength() const {return m_q.ByteCount();}
31  unsigned int PublicKeyLength() const {return 2*m_p.ByteCount();}
32 
33  void GeneratePrivateKey(RandomNumberGenerator &rng, byte *privateKey) const;
34  void GeneratePublicKey(RandomNumberGenerator &rng, const byte *privateKey, byte *publicKey) const;
35  bool Agree(byte *agreedValue, const byte *privateKey, const byte *otherPublicKey, bool validateOtherPublicKey=true) const;
36 
37  const Integer &GetModulus() const {return m_p;}
38  const Integer &GetSubgroupOrder() const {return m_q;}
39  const GFP2Element &GetSubgroupGenerator() const {return m_g;}
40 
41  void SetModulus(const Integer &p) {m_p = p;}
42  void SetSubgroupOrder(const Integer &q) {m_q = q;}
43  void SetSubgroupGenerator(const GFP2Element &g) {m_g = g;}
44 
45 private:
46  unsigned int ExponentBitLength() const;
47 
48  Integer m_p, m_q;
49  GFP2Element m_g;
50 };
51 
52 NAMESPACE_END
53 
54 #endif
unsigned int PublicKeyLength() const
return length of public keys in this domain
Definition: xtrcrypt.h:31
interface for random number generators
Definition: cryptlib.h:668
interface for buffered transformations
Definition: cryptlib.h:770
interface for domains of simple key agreement protocols
Definition: cryptlib.h:1430
an element of GF(p^2)
Definition: xtr.h:13
XTR-DH with key validation.
Definition: xtrcrypt.h:14
"The XTR public key system" by Arjen K.
unsigned int AgreedValueLength() const
return length of agreed value produced
Definition: xtrcrypt.h:29
multiple precision integer and basic arithmetics
Definition: integer.h:26
interface for crypto prameters
Definition: cryptlib.h:1127
unsigned int PrivateKeyLength() const
return length of private keys in this domain
Definition: xtrcrypt.h:30
interface for retrieving values given their names
Definition: cryptlib.h:224