129 lines
3.7 KiB
C++
129 lines
3.7 KiB
C++
#ifndef CRYPTOPP_ESIGN_H
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#define CRYPTOPP_ESIGN_H
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/** \file
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This file contains classes that implement the
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ESIGN signature schemes as defined in IEEE P1363a.
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*/
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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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NAMESPACE_BEGIN(CryptoPP)
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//! _
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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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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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unsigned int GetK() const {return m_n.BitCount()/3-1;}
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Integer m_n, m_e;
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};
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//! _
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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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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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// generate a random private key
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void Initialize(RandomNumberGenerator &rng, unsigned int modulusBits)
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{GenerateRandomWithKeySize(rng, modulusBits);}
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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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//! _
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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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static 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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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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//! EMSA5, for use with ESIGN
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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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struct ESIGN_Keys
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{
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static std::string 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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//! ESIGN, as defined in IEEE P1363a
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template <class H, class STANDARD = P1363_EMSA5>
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struct ESIGN : public TF_SS<STANDARD, H, ESIGN_Keys>
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{
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};
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NAMESPACE_END
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#endif
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