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170 lines
5.7 KiB
170 lines
5.7 KiB
![]()
4 years ago
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// esign.h - originally written and placed in the public domain by Wei Dai
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/// \file esign.h
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/// \brief Classes providing ESIGN signature schemes as defined in IEEE P1363a
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/// \since Crypto++ 5.0
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#ifndef CRYPTOPP_ESIGN_H
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#define CRYPTOPP_ESIGN_H
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#include "cryptlib.h"
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#include "pubkey.h"
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#include "integer.h"
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#include "asn.h"
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#include "misc.h"
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NAMESPACE_BEGIN(CryptoPP)
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/// \brief ESIGN trapdoor function using the public key
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/// \since Crypto++ 5.0
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class ESIGNFunction : public TrapdoorFunction, public ASN1CryptoMaterial<PublicKey>
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{
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typedef ESIGNFunction ThisClass;
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public:
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/// \brief Initialize a ESIGN public key with {n,e}
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/// \param n the modulus
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/// \param e the public exponent
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void Initialize(const Integer &n, const Integer &e)
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{m_n = n; m_e = e;}
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// PublicKey
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void BERDecode(BufferedTransformation &bt);
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void DEREncode(BufferedTransformation &bt) const;
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// CryptoMaterial
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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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// TrapdoorFunction
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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 Integer::Power2(GetK());}
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// non-derived
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const Integer & GetModulus() const {return m_n;}
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const Integer & GetPublicExponent() const {return m_e;}
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void SetModulus(const Integer &n) {m_n = n;}
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void SetPublicExponent(const Integer &e) {m_e = e;}
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protected:
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// Covertiy finding on overflow. The library allows small values for research purposes.
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unsigned int GetK() const {return SaturatingSubtract(m_n.BitCount()/3, 1U);}
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Integer m_n, m_e;
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};
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/// \brief ESIGN trapdoor function using the private key
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/// \since Crypto++ 5.0
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class InvertibleESIGNFunction : public ESIGNFunction, public RandomizedTrapdoorFunctionInverse, public PrivateKey
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{
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typedef InvertibleESIGNFunction ThisClass;
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public:
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/// \brief Initialize a ESIGN private key with {n,e,p,q}
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/// \param n modulus
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/// \param e public exponent
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/// \param p first prime factor
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/// \param q second prime factor
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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 &e, const Integer &p, const Integer &q)
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{m_n = n; m_e = e; m_p = p; m_q = q;}
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/// \brief Create a ESIGN private key
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/// \param rng a RandomNumberGenerator derived class
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/// \param modulusBits the size of the modulud, 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 modulusBits)
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{GenerateRandomWithKeySize(rng, modulusBits);}
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// Squash Visual Studio C4250 warning
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void Save(BufferedTransformation &bt) const
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{BEREncode(bt);}
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// Squash Visual Studio C4250 warning
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void Load(BufferedTransformation &bt)
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{BERDecode(bt);}
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void BERDecode(BufferedTransformation &bt);
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void DEREncode(BufferedTransformation &bt) const;
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Integer CalculateRandomizedInverse(RandomNumberGenerator &rng, const Integer &x) const;
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// GeneratibleCryptoMaterial
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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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void SetPrime1(const Integer &p) {m_p = p;}
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void SetPrime2(const Integer &q) {m_q = q;}
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protected:
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Integer m_p, m_q;
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};
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/// \brief EMSA5 padding method
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/// \tparam T Mask Generation Function
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/// \since Crypto++ 5.0
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template <class T>
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class EMSA5Pad : public PK_DeterministicSignatureMessageEncodingMethod
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{
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public:
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CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "EMSA5";}
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void ComputeMessageRepresentative(RandomNumberGenerator &rng,
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const byte *recoverableMessage, size_t recoverableMessageLength,
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HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
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byte *representative, size_t representativeBitLength) const
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{
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CRYPTOPP_UNUSED(rng), CRYPTOPP_UNUSED(recoverableMessage), CRYPTOPP_UNUSED(recoverableMessageLength);
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CRYPTOPP_UNUSED(messageEmpty), CRYPTOPP_UNUSED(hashIdentifier);
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SecByteBlock digest(hash.DigestSize());
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hash.Final(digest);
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size_t representativeByteLength = BitsToBytes(representativeBitLength);
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T mgf;
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mgf.GenerateAndMask(hash, representative, representativeByteLength, digest, digest.size(), false);
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if (representativeBitLength % 8 != 0)
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representative[0] = (byte)Crop(representative[0], representativeBitLength % 8);
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}
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};
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/// \brief EMSA5 padding method, for use with ESIGN
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/// \since Crypto++ 5.0
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struct P1363_EMSA5 : public SignatureStandard
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{
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typedef EMSA5Pad<P1363_MGF1> SignatureMessageEncodingMethod;
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};
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/// \brief ESIGN keys
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/// \since Crypto++ 5.0
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struct ESIGN_Keys
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{
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CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "ESIGN";}
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typedef ESIGNFunction PublicKey;
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typedef InvertibleESIGNFunction PrivateKey;
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};
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/// \brief ESIGN signature scheme, IEEE P1363a
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/// \tparam H HashTransformation derived class
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/// \tparam STANDARD Signature encoding method
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/// \since Crypto++ 5.0
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template <class H, class STANDARD = P1363_EMSA5>
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struct ESIGN : public TF_SS<ESIGN_Keys, STANDARD, H>
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{
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};
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NAMESPACE_END
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#endif
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