00001 #ifndef CRYPTOPP_ECCRYPTO_H
00002 #define CRYPTOPP_ECCRTPTO_H
00003
00004
00005
00006
00007 #include "pubkey.h"
00008 #include "integer.h"
00009 #include "asn.h"
00010 #include "hmac.h"
00011 #include "sha.h"
00012 #include "gfpcrypt.h"
00013 #include "dh.h"
00014 #include "mqv.h"
00015
00016 NAMESPACE_BEGIN(CryptoPP)
00017
00018 template <class T> class EcPrecomputation;
00019
00020
00021
00022
00023
00024 template <class EC>
00025 class DL_GroupParameters_EC : public DL_GroupParametersImpl<EcPrecomputation<EC> >
00026 {
00027 typedef DL_GroupParameters_EC<EC> ThisClass;
00028
00029 public:
00030 typedef EC EllipticCurve;
00031 typedef typename EllipticCurve::Point Point;
00032 typedef Point Element;
00033 typedef IncompatibleCofactorMultiplication DefaultCofactorOption;
00034
00035 DL_GroupParameters_EC() : m_compress(false), m_encodeAsOID(false) {}
00036 DL_GroupParameters_EC(const OID &oid)
00037 : m_compress(false), m_encodeAsOID(false) {Initialize(oid);}
00038 DL_GroupParameters_EC(const EllipticCurve &ec, const Point &G, const Integer &n, const Integer &k = Integer::Zero())
00039 : m_compress(false), m_encodeAsOID(false) {Initialize(ec, G, n, k);}
00040 DL_GroupParameters_EC(BufferedTransformation &bt)
00041 : m_compress(false), m_encodeAsOID(false) {BERDecode(bt);}
00042
00043 void Initialize(const EllipticCurve &ec, const Point &G, const Integer &n, const Integer &k = Integer::Zero())
00044 {
00045 m_groupPrecomputation.SetCurve(ec);
00046 SetSubgroupGenerator(G);
00047 m_n = n;
00048 m_k = k;
00049 }
00050 void Initialize(const OID &oid);
00051
00052
00053 bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const;
00054 void AssignFrom(const NameValuePairs &source);
00055
00056
00057
00058
00059 void GenerateRandom(RandomNumberGenerator &rng, const NameValuePairs &alg);
00060
00061
00062 const DL_FixedBasePrecomputation<Element> & GetBasePrecomputation() const {return m_gpc;}
00063 DL_FixedBasePrecomputation<Element> & AccessBasePrecomputation() {return m_gpc;}
00064 const Integer & GetSubgroupOrder() const {return m_n;}
00065 Integer GetCofactor() const;
00066 bool ValidateGroup(RandomNumberGenerator &rng, unsigned int level) const;
00067 bool ValidateElement(unsigned int level, const Element &element, const DL_FixedBasePrecomputation<Element> *precomp) const;
00068 bool FastSubgroupCheckAvailable() const {return false;}
00069 void EncodeElement(bool reversible, const Element &element, byte *encoded) const
00070 {
00071 if (reversible)
00072 GetCurve().EncodePoint(encoded, element, m_compress);
00073 else
00074 element.x.Encode(encoded, GetEncodedElementSize(false));
00075 }
00076 unsigned int GetEncodedElementSize(bool reversible) const
00077 {
00078 if (reversible)
00079 return GetCurve().EncodedPointSize(m_compress);
00080 else
00081 return GetCurve().GetField().MaxElementByteLength();
00082 }
00083 Element DecodeElement(const byte *encoded, bool checkForGroupMembership) const
00084 {
00085 Point result;
00086 if (!GetCurve().DecodePoint(result, encoded, GetEncodedElementSize(true)))
00087 throw DL_BadElement();
00088 if (checkForGroupMembership && !ValidateElement(1, result, NULL))
00089 throw DL_BadElement();
00090 return result;
00091 }
00092 Integer ConvertElementToInteger(const Element &element) const;
00093 Integer GetMaxExponent() const {return GetSubgroupOrder()-1;}
00094 bool IsIdentity(const Element &element) const {return element.identity;}
00095 void SimultaneousExponentiate(Element *results, const Element &base, const Integer *exponents, unsigned int exponentsCount) const;
00096
00097
00098 OID GetAlgorithmID() const;
00099
00100
00101 Element MultiplyElements(const Element &a, const Element &b) const;
00102 Element CascadeExponentiate(const Element &element1, const Integer &exponent1, const Element &element2, const Integer &exponent2) const;
00103
00104
00105
00106
00107 static OID GetNextRecommendedParametersOID(const OID &oid);
00108
00109 void BERDecode(BufferedTransformation &bt);
00110 void DEREncode(BufferedTransformation &bt) const;
00111
00112 void SetPointCompression(bool compress) {m_compress = compress;}
00113 bool GetPointCompression() const {return m_compress;}
00114
00115 void SetEncodeAsOID(bool encodeAsOID) {m_encodeAsOID = encodeAsOID;}
00116 bool GetEncodeAsOID() const {return m_encodeAsOID;}
00117
00118 const EllipticCurve& GetCurve() const {return m_groupPrecomputation.GetCurve();}
00119
00120 #ifdef CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY
00121 const Point& GetBasePoint() const {return GetSubgroupGenerator();}
00122 const Integer& GetBasePointOrder() const {return GetSubgroupOrder();}
00123 void LoadRecommendedParameters(const OID &oid) {Initialize(oid);}
00124 #endif
00125
00126 protected:
00127 unsigned int FieldElementLength() const {return GetCurve().GetField().MaxElementByteLength();}
00128 unsigned int ExponentLength() const {return m_n.ByteCount();}
00129
00130 OID m_oid;
00131 Integer m_n;
00132 bool m_compress, m_encodeAsOID;
00133 mutable Integer m_k;
00134 };
00135
00136
00137 template <class EC>
00138 class DL_PublicKey_EC : public DL_PublicKeyImpl<DL_GroupParameters_EC<EC> >
00139 {
00140 public:
00141 typedef typename EC::Point Element;
00142
00143 void Initialize(const DL_GroupParameters_EC<EC> ¶ms, const Element &Q)
00144 {AccessGroupParameters() = params; SetPublicElement(Q);}
00145 void Initialize(const EC &ec, const Element &G, const Integer &n, const Element &Q)
00146 {AccessGroupParameters().Initialize(ec, G, n); SetPublicElement(Q);}
00147
00148
00149 void BERDecodeKey2(BufferedTransformation &bt, bool parametersPresent, unsigned int size);
00150 void DEREncodeKey(BufferedTransformation &bt) const;
00151 };
00152
00153
00154 template <class EC>
00155 class DL_PrivateKey_EC : public DL_PrivateKeyImpl<DL_GroupParameters_EC<EC> >
00156 {
00157 public:
00158 typedef typename EC::Point Element;
00159
00160 void Initialize(const DL_GroupParameters_EC<EC> ¶ms, const Integer &x)
00161 {AccessGroupParameters() = params; SetPrivateExponent(x);}
00162 void Initialize(const EC &ec, const Element &G, const Integer &n, const Integer &x)
00163 {AccessGroupParameters().Initialize(ec, G, n); SetPrivateExponent(x);}
00164 void Initialize(RandomNumberGenerator &rng, const DL_GroupParameters_EC<EC> ¶ms)
00165 {GenerateRandom(rng, params);}
00166 void Initialize(RandomNumberGenerator &rng, const EC &ec, const Element &G, const Integer &n)
00167 {GenerateRandom(rng, DL_GroupParameters_EC<EC>(ec, G, n));}
00168
00169
00170 void BERDecodeKey2(BufferedTransformation &bt, bool parametersPresent, unsigned int size);
00171 void DEREncodeKey(BufferedTransformation &bt) const;
00172 };
00173
00174
00175 template <class EC, class COFACTOR_OPTION = CPP_TYPENAME DL_GroupParameters_EC<EC>::DefaultCofactorOption>
00176 struct ECDH
00177 {
00178 typedef DH_Domain<DL_GroupParameters_EC<EC>, COFACTOR_OPTION> Domain;
00179 };
00180
00181
00182 template <class EC, class COFACTOR_OPTION = CPP_TYPENAME DL_GroupParameters_EC<EC>::DefaultCofactorOption>
00183 struct ECMQV
00184 {
00185 typedef MQV_Domain<DL_GroupParameters_EC<EC>, COFACTOR_OPTION> Domain;
00186 };
00187
00188
00189 template <class EC>
00190 struct DL_Keys_EC
00191 {
00192 typedef DL_PublicKey_EC<EC> PublicKey;
00193 typedef DL_PrivateKey_EC<EC> PrivateKey;
00194 };
00195
00196 template <class EC, class H = SHA>
00197 struct ECDSA;
00198
00199
00200 template <class EC>
00201 struct DL_Keys_ECDSA
00202 {
00203 typedef DL_PublicKey_EC<EC> PublicKey;
00204 typedef DL_PrivateKey_WithSignaturePairwiseConsistencyTest<DL_PrivateKey_EC<EC>, ECDSA<EC> > PrivateKey;
00205 };
00206
00207
00208 template <class EC>
00209 class DL_Algorithm_ECDSA : public DL_Algorithm_GDSA<typename EC::Point>
00210 {
00211 public:
00212 static const char * StaticAlgorithmName() {return "ECDSA";}
00213 };
00214
00215
00216 template <class EC>
00217 class DL_Algorithm_ECNR : public DL_Algorithm_NR<typename EC::Point>
00218 {
00219 public:
00220 static const char * StaticAlgorithmName() {return "ECNR";}
00221 };
00222
00223
00224 template <class EC, class H>
00225 struct ECDSA : public DL_SS<DL_Keys_ECDSA<EC>, DL_Algorithm_ECDSA<EC>, DL_SignatureMessageEncodingMethod_DSA, H>
00226 {
00227 };
00228
00229
00230 template <class EC, class H = SHA>
00231 struct ECNR : public DL_SS<DL_Keys_EC<EC>, DL_Algorithm_ECNR<EC>, DL_SignatureMessageEncodingMethod_NR, H>
00232 {
00233 };
00234
00235
00236
00237
00238
00239 template <class EC, class COFACTOR_OPTION = NoCofactorMultiplication, bool DHAES_MODE = false>
00240 struct ECIES
00241 : public DL_ES<
00242 DL_Keys_EC<EC>,
00243 DL_KeyAgreementAlgorithm_DH<typename EC::Point, COFACTOR_OPTION>,
00244 DL_KeyDerivationAlgorithm_P1363<typename EC::Point, DHAES_MODE, P1363_KDF2<SHA1> >,
00245 DL_EncryptionAlgorithm_Xor<HMAC<SHA1>, DHAES_MODE>,
00246 ECIES<EC> >
00247 {
00248 static std::string StaticAlgorithmName() {return "ECIES";}
00249 };
00250
00251 NAMESPACE_END
00252
00253 #endif