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rw.h

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00001 #ifndef CRYPTOPP_RW_H
00002 #define CRYPTOPP_RW_H
00003 
00004 /** \file
00005         This file contains classes that implement the
00006         Rabin-Williams signature schemes as defined in IEEE P1363.
00007 */
00008 
00009 #include "integer.h"
00010 #include "pssr.h"
00011 
00012 NAMESPACE_BEGIN(CryptoPP)
00013 
00014 //! _
00015 class RWFunction : virtual public TrapdoorFunction, public PublicKey
00016 {
00017         typedef RWFunction ThisClass;
00018 
00019 public:
00020         void Initialize(const Integer &n)
00021                 {m_n = n;}
00022 
00023         void BERDecode(BufferedTransformation &bt);
00024         void DEREncode(BufferedTransformation &bt) const;
00025 
00026         Integer ApplyFunction(const Integer &x) const;
00027         Integer PreimageBound() const {return ++(m_n>>1);}
00028         Integer ImageBound() const {return m_n;}
00029 
00030         bool Validate(RandomNumberGenerator &rng, unsigned int level) const;
00031         bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const;
00032         void AssignFrom(const NameValuePairs &source);
00033 
00034         const Integer& GetModulus() const {return m_n;}
00035         void SetModulus(const Integer &n) {m_n = n;}
00036 
00037 protected:
00038         Integer m_n;
00039 };
00040 
00041 //! _
00042 class InvertibleRWFunction : public RWFunction, public TrapdoorFunctionInverse, public PrivateKey
00043 {
00044         typedef InvertibleRWFunction ThisClass;
00045 
00046 public:
00047         void Initialize(const Integer &n, const Integer &p, const Integer &q, const Integer &u)
00048                 {m_n = n; m_p = p; m_q = q; m_u = u;}
00049         // generate a random private key
00050         void Initialize(RandomNumberGenerator &rng, unsigned int modulusBits)
00051                 {GenerateRandomWithKeySize(rng, modulusBits);}
00052 
00053         void BERDecode(BufferedTransformation &bt);
00054         void DEREncode(BufferedTransformation &bt) const;
00055 
00056         Integer CalculateInverse(RandomNumberGenerator &rng, const Integer &x) const;
00057 
00058         // GeneratibleCryptoMaterial
00059         bool Validate(RandomNumberGenerator &rng, unsigned int level) const;
00060         bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const;
00061         void AssignFrom(const NameValuePairs &source);
00062         /*! parameters: (ModulusSize) */
00063         void GenerateRandom(RandomNumberGenerator &rng, const NameValuePairs &alg);
00064 
00065         const Integer& GetPrime1() const {return m_p;}
00066         const Integer& GetPrime2() const {return m_q;}
00067         const Integer& GetMultiplicativeInverseOfPrime2ModPrime1() const {return m_u;}
00068 
00069         void SetPrime1(const Integer &p) {m_p = p;}
00070         void SetPrime2(const Integer &q) {m_q = q;}
00071         void SetMultiplicativeInverseOfPrime2ModPrime1(const Integer &u) {m_u = u;}
00072 
00073 protected:
00074         Integer m_p, m_q, m_u;
00075 };
00076 
00077 //! _
00078 class EMSA2Pad : public EMSA2HashIdLookup<PK_DeterministicSignatureMessageEncodingMethod>
00079 {
00080 public:
00081         static const char *StaticAlgorithmName() {return "EMSA2";}
00082         
00083         unsigned int MaxUnpaddedLength(unsigned int paddedLength) const {return (paddedLength+1)/8-2;}
00084 
00085         void ComputeMessageRepresentative(RandomNumberGenerator &rng, 
00086                 const byte *recoverableMessage, unsigned int recoverableMessageLength,
00087                 HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
00088                 byte *representative, unsigned int representativeBitLength) const;
00089 };
00090 
00091 //! EMSA2, for use with RWSS
00092 /*! Only the following hash functions are supported by this signature standard:
00093         \dontinclude pssr.h
00094         \skip can be instantiated
00095         \until end of list
00096 */
00097 struct P1363_EMSA2 : public SignatureStandard
00098 {
00099         typedef EMSA2Pad SignatureMessageEncodingMethod;
00100 };
00101 
00102 //! RW
00103 struct RW
00104 {
00105         static std::string StaticAlgorithmName() {return "RW";}
00106         typedef RWFunction PublicKey;
00107         typedef InvertibleRWFunction PrivateKey;
00108 };
00109 
00110 //! RWSS
00111 template <class STANDARD, class H>
00112 struct RWSS : public TF_SS<STANDARD, H, RW>
00113 {
00114 };
00115 
00116 NAMESPACE_END
00117 
00118 #endif

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