136 lines
4.4 KiB
C++
136 lines
4.4 KiB
C++
// rabin.h - originally written and placed in the public domain by Wei Dai
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/// \file rabin.h
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/// \brief Classes for Rabin encryption and signature schemes
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#ifndef CRYPTOPP_RABIN_H
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#define CRYPTOPP_RABIN_H
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#include "cryptlib.h"
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#include "oaep.h"
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#include "pssr.h"
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#include "integer.h"
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NAMESPACE_BEGIN(CryptoPP)
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/// \brief Rabin trapdoor function using the public key
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/// \since Crypto++ 2.0
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class RabinFunction : public TrapdoorFunction, public PublicKey
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{
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typedef RabinFunction ThisClass;
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public:
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/// \brief Initialize a Rabin public key
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/// \param n the modulus
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/// \param r element r
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/// \param s element s
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void Initialize(const Integer &n, const Integer &r, const Integer &s)
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{m_n = n; m_r = r; m_s = s;}
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void BERDecode(BufferedTransformation &bt);
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void DEREncode(BufferedTransformation &bt) const;
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Integer ApplyFunction(const Integer &x) const;
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Integer PreimageBound() const {return m_n;}
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Integer ImageBound() const {return m_n;}
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bool Validate(RandomNumberGenerator &rng, unsigned int level) const;
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bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const;
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void AssignFrom(const NameValuePairs &source);
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const Integer& GetModulus() const {return m_n;}
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const Integer& GetQuadraticResidueModPrime1() const {return m_r;}
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const Integer& GetQuadraticResidueModPrime2() const {return m_s;}
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void SetModulus(const Integer &n) {m_n = n;}
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void SetQuadraticResidueModPrime1(const Integer &r) {m_r = r;}
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void SetQuadraticResidueModPrime2(const Integer &s) {m_s = s;}
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protected:
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Integer m_n, m_r, m_s;
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};
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/// \brief Rabin trapdoor function using the private key
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/// \since Crypto++ 2.0
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class InvertibleRabinFunction : public RabinFunction, public TrapdoorFunctionInverse, public PrivateKey
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{
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typedef InvertibleRabinFunction ThisClass;
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public:
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/// \brief Initialize a Rabin private key
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/// \param n modulus
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/// \param r element r
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/// \param s element s
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/// \param p first prime factor
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/// \param q second prime factor
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/// \param u q<sup>-1</sup> mod p
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/// \details This Initialize() function overload initializes a private key from existing parameters.
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void Initialize(const Integer &n, const Integer &r, const Integer &s, const Integer &p, const Integer &q, const Integer &u)
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{m_n = n; m_r = r; m_s = s; m_p = p; m_q = q; m_u = u;}
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/// \brief Create a Rabin private key
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/// \param rng a RandomNumberGenerator derived class
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/// \param keybits the size of the key, in bits
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/// \details This function overload of Initialize() creates a new private key because it
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/// takes a RandomNumberGenerator() as a parameter. If you have an existing keypair,
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/// then use one of the other Initialize() overloads.
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void Initialize(RandomNumberGenerator &rng, unsigned int keybits)
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{GenerateRandomWithKeySize(rng, keybits);}
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void BERDecode(BufferedTransformation &bt);
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void DEREncode(BufferedTransformation &bt) const;
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Integer CalculateInverse(RandomNumberGenerator &rng, const Integer &x) const;
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bool Validate(RandomNumberGenerator &rng, unsigned int level) const;
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bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const;
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void AssignFrom(const NameValuePairs &source);
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/*! parameters: (ModulusSize) */
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void GenerateRandom(RandomNumberGenerator &rng, const NameValuePairs &alg);
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const Integer& GetPrime1() const {return m_p;}
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const Integer& GetPrime2() const {return m_q;}
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const Integer& GetMultiplicativeInverseOfPrime2ModPrime1() const {return m_u;}
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void SetPrime1(const Integer &p) {m_p = p;}
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void SetPrime2(const Integer &q) {m_q = q;}
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void SetMultiplicativeInverseOfPrime2ModPrime1(const Integer &u) {m_u = u;}
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protected:
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Integer m_p, m_q, m_u;
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};
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/// \brief Rabin keys
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struct Rabin
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{
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static std::string StaticAlgorithmName() {return "Rabin-Crypto++Variant";}
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typedef RabinFunction PublicKey;
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typedef InvertibleRabinFunction PrivateKey;
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};
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/// \brief Rabin encryption scheme
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/// \tparam STANDARD encryption standard
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template <class STANDARD>
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struct RabinES : public TF_ES<Rabin, STANDARD>
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{
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};
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/// \brief Rabin signature scheme
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/// \tparam STANDARD signature standard
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/// \tparam H hash transformation
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template <class STANDARD, class H>
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struct RabinSS : public TF_SS<Rabin, STANDARD, H>
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{
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};
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// More typedefs for backwards compatibility
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class SHA1;
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typedef RabinES<OAEP<SHA1> >::Decryptor RabinDecryptor;
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typedef RabinES<OAEP<SHA1> >::Encryptor RabinEncryptor;
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NAMESPACE_END
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#endif
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