/usr/include/crypto++/pubkey.h is in libcrypto++-dev 5.6.1-6+deb8u3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 | // pubkey.h - written and placed in the public domain by Wei Dai
#ifndef CRYPTOPP_PUBKEY_H
#define CRYPTOPP_PUBKEY_H
/** \file
This file contains helper classes/functions for implementing public key algorithms.
The class hierachies in this .h file tend to look like this:
<pre>
x1
/ \
y1 z1
| |
x2<y1> x2<z1>
| |
y2 z2
| |
x3<y2> x3<z2>
| |
y3 z3
</pre>
- x1, y1, z1 are abstract interface classes defined in cryptlib.h
- x2, y2, z2 are implementations of the interfaces using "abstract policies", which
are pure virtual functions that should return interfaces to interchangeable algorithms.
These classes have "Base" suffixes.
- x3, y3, z3 hold actual algorithms and implement those virtual functions.
These classes have "Impl" suffixes.
The "TF_" prefix means an implementation using trapdoor functions on integers.
The "DL_" prefix means an implementation using group operations (in groups where discrete log is hard).
*/
#include "modarith.h"
#include "filters.h"
#include "eprecomp.h"
#include "fips140.h"
#include "argnames.h"
#include <memory>
// VC60 workaround: this macro is defined in shlobj.h and conflicts with a template parameter used in this file
#undef INTERFACE
NAMESPACE_BEGIN(CryptoPP)
//! _
class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE TrapdoorFunctionBounds
{
public:
virtual ~TrapdoorFunctionBounds() {}
virtual Integer PreimageBound() const =0;
virtual Integer ImageBound() const =0;
virtual Integer MaxPreimage() const {return --PreimageBound();}
virtual Integer MaxImage() const {return --ImageBound();}
};
//! _
class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE RandomizedTrapdoorFunction : public TrapdoorFunctionBounds
{
public:
virtual Integer ApplyRandomizedFunction(RandomNumberGenerator &rng, const Integer &x) const =0;
virtual bool IsRandomized() const {return true;}
};
//! _
class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE TrapdoorFunction : public RandomizedTrapdoorFunction
{
public:
Integer ApplyRandomizedFunction(RandomNumberGenerator &rng, const Integer &x) const
{return ApplyFunction(x);}
bool IsRandomized() const {return false;}
virtual Integer ApplyFunction(const Integer &x) const =0;
};
//! _
class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE RandomizedTrapdoorFunctionInverse
{
public:
virtual ~RandomizedTrapdoorFunctionInverse() {}
virtual Integer CalculateRandomizedInverse(RandomNumberGenerator &rng, const Integer &x) const =0;
virtual bool IsRandomized() const {return true;}
};
//! _
class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE TrapdoorFunctionInverse : public RandomizedTrapdoorFunctionInverse
{
public:
virtual ~TrapdoorFunctionInverse() {}
Integer CalculateRandomizedInverse(RandomNumberGenerator &rng, const Integer &x) const
{return CalculateInverse(rng, x);}
bool IsRandomized() const {return false;}
virtual Integer CalculateInverse(RandomNumberGenerator &rng, const Integer &x) const =0;
};
// ********************************************************
//! message encoding method for public key encryption
class CRYPTOPP_NO_VTABLE PK_EncryptionMessageEncodingMethod
{
public:
virtual ~PK_EncryptionMessageEncodingMethod() {}
virtual bool ParameterSupported(const char *name) const {return false;}
//! max size of unpadded message in bytes, given max size of padded message in bits (1 less than size of modulus)
virtual size_t MaxUnpaddedLength(size_t paddedLength) const =0;
virtual void Pad(RandomNumberGenerator &rng, const byte *raw, size_t inputLength, byte *padded, size_t paddedBitLength, const NameValuePairs ¶meters) const =0;
virtual DecodingResult Unpad(const byte *padded, size_t paddedBitLength, byte *raw, const NameValuePairs ¶meters) const =0;
};
// ********************************************************
//! _
template <class TFI, class MEI>
class CRYPTOPP_NO_VTABLE TF_Base
{
protected:
virtual const TrapdoorFunctionBounds & GetTrapdoorFunctionBounds() const =0;
typedef TFI TrapdoorFunctionInterface;
virtual const TrapdoorFunctionInterface & GetTrapdoorFunctionInterface() const =0;
typedef MEI MessageEncodingInterface;
virtual const MessageEncodingInterface & GetMessageEncodingInterface() const =0;
};
// ********************************************************
//! _
template <class BASE>
class CRYPTOPP_NO_VTABLE PK_FixedLengthCryptoSystemImpl : public BASE
{
public:
size_t MaxPlaintextLength(size_t ciphertextLength) const
{return ciphertextLength == FixedCiphertextLength() ? FixedMaxPlaintextLength() : 0;}
size_t CiphertextLength(size_t plaintextLength) const
{return plaintextLength <= FixedMaxPlaintextLength() ? FixedCiphertextLength() : 0;}
virtual size_t FixedMaxPlaintextLength() const =0;
virtual size_t FixedCiphertextLength() const =0;
};
//! _
template <class INTERFACE, class BASE>
class CRYPTOPP_NO_VTABLE TF_CryptoSystemBase : public PK_FixedLengthCryptoSystemImpl<INTERFACE>, protected BASE
{
public:
bool ParameterSupported(const char *name) const {return this->GetMessageEncodingInterface().ParameterSupported(name);}
size_t FixedMaxPlaintextLength() const {return this->GetMessageEncodingInterface().MaxUnpaddedLength(PaddedBlockBitLength());}
size_t FixedCiphertextLength() const {return this->GetTrapdoorFunctionBounds().MaxImage().ByteCount();}
protected:
size_t PaddedBlockByteLength() const {return BitsToBytes(PaddedBlockBitLength());}
size_t PaddedBlockBitLength() const {return this->GetTrapdoorFunctionBounds().PreimageBound().BitCount()-1;}
};
//! _
class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE TF_DecryptorBase : public TF_CryptoSystemBase<PK_Decryptor, TF_Base<TrapdoorFunctionInverse, PK_EncryptionMessageEncodingMethod> >
{
public:
DecodingResult Decrypt(RandomNumberGenerator &rng, const byte *ciphertext, size_t ciphertextLength, byte *plaintext, const NameValuePairs ¶meters = g_nullNameValuePairs) const;
};
//! _
class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE TF_EncryptorBase : public TF_CryptoSystemBase<PK_Encryptor, TF_Base<RandomizedTrapdoorFunction, PK_EncryptionMessageEncodingMethod> >
{
public:
void Encrypt(RandomNumberGenerator &rng, const byte *plaintext, size_t plaintextLength, byte *ciphertext, const NameValuePairs ¶meters = g_nullNameValuePairs) const;
};
// ********************************************************
typedef std::pair<const byte *, size_t> HashIdentifier;
//! interface for message encoding method for public key signature schemes
class CRYPTOPP_NO_VTABLE PK_SignatureMessageEncodingMethod
{
public:
virtual ~PK_SignatureMessageEncodingMethod() {}
virtual size_t MinRepresentativeBitLength(size_t hashIdentifierLength, size_t digestLength) const
{return 0;}
virtual size_t MaxRecoverableLength(size_t representativeBitLength, size_t hashIdentifierLength, size_t digestLength) const
{return 0;}
bool IsProbabilistic() const
{return true;}
bool AllowNonrecoverablePart() const
{throw NotImplemented("PK_MessageEncodingMethod: this signature scheme does not support message recovery");}
virtual bool RecoverablePartFirst() const
{throw NotImplemented("PK_MessageEncodingMethod: this signature scheme does not support message recovery");}
// for verification, DL
virtual void ProcessSemisignature(HashTransformation &hash, const byte *semisignature, size_t semisignatureLength) const {}
// for signature
virtual void ProcessRecoverableMessage(HashTransformation &hash,
const byte *recoverableMessage, size_t recoverableMessageLength,
const byte *presignature, size_t presignatureLength,
SecByteBlock &semisignature) const
{
if (RecoverablePartFirst())
assert(!"ProcessRecoverableMessage() not implemented");
}
virtual void ComputeMessageRepresentative(RandomNumberGenerator &rng,
const byte *recoverableMessage, size_t recoverableMessageLength,
HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
byte *representative, size_t representativeBitLength) const =0;
virtual bool VerifyMessageRepresentative(
HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
byte *representative, size_t representativeBitLength) const =0;
virtual DecodingResult RecoverMessageFromRepresentative( // for TF
HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
byte *representative, size_t representativeBitLength,
byte *recoveredMessage) const
{throw NotImplemented("PK_MessageEncodingMethod: this signature scheme does not support message recovery");}
virtual DecodingResult RecoverMessageFromSemisignature( // for DL
HashTransformation &hash, HashIdentifier hashIdentifier,
const byte *presignature, size_t presignatureLength,
const byte *semisignature, size_t semisignatureLength,
byte *recoveredMessage) const
{throw NotImplemented("PK_MessageEncodingMethod: this signature scheme does not support message recovery");}
// VC60 workaround
struct HashIdentifierLookup
{
template <class H> struct HashIdentifierLookup2
{
static HashIdentifier CRYPTOPP_API Lookup()
{
return HashIdentifier((const byte *)NULL, 0);
}
};
};
};
class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE PK_DeterministicSignatureMessageEncodingMethod : public PK_SignatureMessageEncodingMethod
{
public:
bool VerifyMessageRepresentative(
HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
byte *representative, size_t representativeBitLength) const;
};
class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE PK_RecoverableSignatureMessageEncodingMethod : public PK_SignatureMessageEncodingMethod
{
public:
bool VerifyMessageRepresentative(
HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
byte *representative, size_t representativeBitLength) const;
};
class CRYPTOPP_DLL DL_SignatureMessageEncodingMethod_DSA : public PK_DeterministicSignatureMessageEncodingMethod
{
public:
void ComputeMessageRepresentative(RandomNumberGenerator &rng,
const byte *recoverableMessage, size_t recoverableMessageLength,
HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
byte *representative, size_t representativeBitLength) const;
};
class CRYPTOPP_DLL DL_SignatureMessageEncodingMethod_NR : public PK_DeterministicSignatureMessageEncodingMethod
{
public:
void ComputeMessageRepresentative(RandomNumberGenerator &rng,
const byte *recoverableMessage, size_t recoverableMessageLength,
HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
byte *representative, size_t representativeBitLength) const;
};
class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE PK_MessageAccumulatorBase : public PK_MessageAccumulator
{
public:
PK_MessageAccumulatorBase() : m_empty(true) {}
virtual HashTransformation & AccessHash() =0;
void Update(const byte *input, size_t length)
{
AccessHash().Update(input, length);
m_empty = m_empty && length == 0;
}
SecByteBlock m_recoverableMessage, m_representative, m_presignature, m_semisignature;
Integer m_k, m_s;
bool m_empty;
};
template <class HASH_ALGORITHM>
class PK_MessageAccumulatorImpl : public PK_MessageAccumulatorBase, protected ObjectHolder<HASH_ALGORITHM>
{
public:
HashTransformation & AccessHash() {return this->m_object;}
};
//! _
template <class INTERFACE, class BASE>
class CRYPTOPP_NO_VTABLE TF_SignatureSchemeBase : public INTERFACE, protected BASE
{
public:
size_t SignatureLength() const
{return this->GetTrapdoorFunctionBounds().MaxPreimage().ByteCount();}
size_t MaxRecoverableLength() const
{return this->GetMessageEncodingInterface().MaxRecoverableLength(MessageRepresentativeBitLength(), GetHashIdentifier().second, GetDigestSize());}
size_t MaxRecoverableLengthFromSignatureLength(size_t signatureLength) const
{return this->MaxRecoverableLength();}
bool IsProbabilistic() const
{return this->GetTrapdoorFunctionInterface().IsRandomized() || this->GetMessageEncodingInterface().IsProbabilistic();}
bool AllowNonrecoverablePart() const
{return this->GetMessageEncodingInterface().AllowNonrecoverablePart();}
bool RecoverablePartFirst() const
{return this->GetMessageEncodingInterface().RecoverablePartFirst();}
protected:
size_t MessageRepresentativeLength() const {return BitsToBytes(MessageRepresentativeBitLength());}
size_t MessageRepresentativeBitLength() const {return this->GetTrapdoorFunctionBounds().ImageBound().BitCount()-1;}
virtual HashIdentifier GetHashIdentifier() const =0;
virtual size_t GetDigestSize() const =0;
};
//! _
class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE TF_SignerBase : public TF_SignatureSchemeBase<PK_Signer, TF_Base<RandomizedTrapdoorFunctionInverse, PK_SignatureMessageEncodingMethod> >
{
public:
void InputRecoverableMessage(PK_MessageAccumulator &messageAccumulator, const byte *recoverableMessage, size_t recoverableMessageLength) const;
size_t SignAndRestart(RandomNumberGenerator &rng, PK_MessageAccumulator &messageAccumulator, byte *signature, bool restart=true) const;
};
//! _
class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE TF_VerifierBase : public TF_SignatureSchemeBase<PK_Verifier, TF_Base<TrapdoorFunction, PK_SignatureMessageEncodingMethod> >
{
public:
void InputSignature(PK_MessageAccumulator &messageAccumulator, const byte *signature, size_t signatureLength) const;
bool VerifyAndRestart(PK_MessageAccumulator &messageAccumulator) const;
DecodingResult RecoverAndRestart(byte *recoveredMessage, PK_MessageAccumulator &recoveryAccumulator) const;
};
// ********************************************************
//! _
template <class T1, class T2, class T3>
struct TF_CryptoSchemeOptions
{
typedef T1 AlgorithmInfo;
typedef T2 Keys;
typedef typename Keys::PrivateKey PrivateKey;
typedef typename Keys::PublicKey PublicKey;
typedef T3 MessageEncodingMethod;
};
//! _
template <class T1, class T2, class T3, class T4>
struct TF_SignatureSchemeOptions : public TF_CryptoSchemeOptions<T1, T2, T3>
{
typedef T4 HashFunction;
};
//! _
template <class BASE, class SCHEME_OPTIONS, class KEY_CLASS>
class CRYPTOPP_NO_VTABLE TF_ObjectImplBase : public AlgorithmImpl<BASE, typename SCHEME_OPTIONS::AlgorithmInfo>
{
public:
typedef SCHEME_OPTIONS SchemeOptions;
typedef KEY_CLASS KeyClass;
PublicKey & AccessPublicKey() {return AccessKey();}
const PublicKey & GetPublicKey() const {return GetKey();}
PrivateKey & AccessPrivateKey() {return AccessKey();}
const PrivateKey & GetPrivateKey() const {return GetKey();}
virtual const KeyClass & GetKey() const =0;
virtual KeyClass & AccessKey() =0;
const KeyClass & GetTrapdoorFunction() const {return GetKey();}
PK_MessageAccumulator * NewSignatureAccumulator(RandomNumberGenerator &rng) const
{
return new PK_MessageAccumulatorImpl<CPP_TYPENAME SCHEME_OPTIONS::HashFunction>;
}
PK_MessageAccumulator * NewVerificationAccumulator() const
{
return new PK_MessageAccumulatorImpl<CPP_TYPENAME SCHEME_OPTIONS::HashFunction>;
}
protected:
const typename BASE::MessageEncodingInterface & GetMessageEncodingInterface() const
{return Singleton<CPP_TYPENAME SCHEME_OPTIONS::MessageEncodingMethod>().Ref();}
const TrapdoorFunctionBounds & GetTrapdoorFunctionBounds() const
{return GetKey();}
const typename BASE::TrapdoorFunctionInterface & GetTrapdoorFunctionInterface() const
{return GetKey();}
// for signature scheme
HashIdentifier GetHashIdentifier() const
{
typedef CPP_TYPENAME SchemeOptions::MessageEncodingMethod::HashIdentifierLookup::template HashIdentifierLookup2<CPP_TYPENAME SchemeOptions::HashFunction> L;
return L::Lookup();
}
size_t GetDigestSize() const
{
typedef CPP_TYPENAME SchemeOptions::HashFunction H;
return H::DIGESTSIZE;
}
};
//! _
template <class BASE, class SCHEME_OPTIONS, class KEY>
class TF_ObjectImplExtRef : public TF_ObjectImplBase<BASE, SCHEME_OPTIONS, KEY>
{
public:
TF_ObjectImplExtRef(const KEY *pKey = NULL) : m_pKey(pKey) {}
void SetKeyPtr(const KEY *pKey) {m_pKey = pKey;}
const KEY & GetKey() const {return *m_pKey;}
KEY & AccessKey() {throw NotImplemented("TF_ObjectImplExtRef: cannot modify refererenced key");}
private:
const KEY * m_pKey;
};
//! _
template <class BASE, class SCHEME_OPTIONS, class KEY_CLASS>
class CRYPTOPP_NO_VTABLE TF_ObjectImpl : public TF_ObjectImplBase<BASE, SCHEME_OPTIONS, KEY_CLASS>
{
public:
typedef KEY_CLASS KeyClass;
const KeyClass & GetKey() const {return m_trapdoorFunction;}
KeyClass & AccessKey() {return m_trapdoorFunction;}
private:
KeyClass m_trapdoorFunction;
};
//! _
template <class SCHEME_OPTIONS>
class TF_DecryptorImpl : public TF_ObjectImpl<TF_DecryptorBase, SCHEME_OPTIONS, typename SCHEME_OPTIONS::PrivateKey>
{
};
//! _
template <class SCHEME_OPTIONS>
class TF_EncryptorImpl : public TF_ObjectImpl<TF_EncryptorBase, SCHEME_OPTIONS, typename SCHEME_OPTIONS::PublicKey>
{
};
//! _
template <class SCHEME_OPTIONS>
class TF_SignerImpl : public TF_ObjectImpl<TF_SignerBase, SCHEME_OPTIONS, typename SCHEME_OPTIONS::PrivateKey>
{
};
//! _
template <class SCHEME_OPTIONS>
class TF_VerifierImpl : public TF_ObjectImpl<TF_VerifierBase, SCHEME_OPTIONS, typename SCHEME_OPTIONS::PublicKey>
{
};
// ********************************************************
//! _
class CRYPTOPP_NO_VTABLE MaskGeneratingFunction
{
public:
virtual ~MaskGeneratingFunction() {}
virtual void GenerateAndMask(HashTransformation &hash, byte *output, size_t outputLength, const byte *input, size_t inputLength, bool mask = true) const =0;
};
CRYPTOPP_DLL void CRYPTOPP_API P1363_MGF1KDF2_Common(HashTransformation &hash, byte *output, size_t outputLength, const byte *input, size_t inputLength, const byte *derivationParams, size_t derivationParamsLength, bool mask, unsigned int counterStart);
//! _
class P1363_MGF1 : public MaskGeneratingFunction
{
public:
static const char * CRYPTOPP_API StaticAlgorithmName() {return "MGF1";}
void GenerateAndMask(HashTransformation &hash, byte *output, size_t outputLength, const byte *input, size_t inputLength, bool mask = true) const
{
P1363_MGF1KDF2_Common(hash, output, outputLength, input, inputLength, NULL, 0, mask, 0);
}
};
// ********************************************************
//! _
template <class H>
class P1363_KDF2
{
public:
static void CRYPTOPP_API DeriveKey(byte *output, size_t outputLength, const byte *input, size_t inputLength, const byte *derivationParams, size_t derivationParamsLength)
{
H h;
P1363_MGF1KDF2_Common(h, output, outputLength, input, inputLength, derivationParams, derivationParamsLength, false, 1);
}
};
// ********************************************************
//! to be thrown by DecodeElement and AgreeWithStaticPrivateKey
class DL_BadElement : public InvalidDataFormat
{
public:
DL_BadElement() : InvalidDataFormat("CryptoPP: invalid group element") {}
};
//! interface for DL group parameters
template <class T>
class CRYPTOPP_NO_VTABLE DL_GroupParameters : public CryptoParameters
{
typedef DL_GroupParameters<T> ThisClass;
public:
typedef T Element;
DL_GroupParameters() : m_validationLevel(0) {}
// CryptoMaterial
bool Validate(RandomNumberGenerator &rng, unsigned int level) const
{
if (!GetBasePrecomputation().IsInitialized())
return false;
if (m_validationLevel > level)
return true;
bool pass = ValidateGroup(rng, level);
pass = pass && ValidateElement(level, GetSubgroupGenerator(), &GetBasePrecomputation());
m_validationLevel = pass ? level+1 : 0;
return pass;
}
bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const
{
return GetValueHelper(this, name, valueType, pValue)
CRYPTOPP_GET_FUNCTION_ENTRY(SubgroupOrder)
CRYPTOPP_GET_FUNCTION_ENTRY(SubgroupGenerator)
;
}
bool SupportsPrecomputation() const {return true;}
void Precompute(unsigned int precomputationStorage=16)
{
AccessBasePrecomputation().Precompute(GetGroupPrecomputation(), GetSubgroupOrder().BitCount(), precomputationStorage);
}
void LoadPrecomputation(BufferedTransformation &storedPrecomputation)
{
AccessBasePrecomputation().Load(GetGroupPrecomputation(), storedPrecomputation);
m_validationLevel = 0;
}
void SavePrecomputation(BufferedTransformation &storedPrecomputation) const
{
GetBasePrecomputation().Save(GetGroupPrecomputation(), storedPrecomputation);
}
// non-inherited
virtual const Element & GetSubgroupGenerator() const {return GetBasePrecomputation().GetBase(GetGroupPrecomputation());}
virtual void SetSubgroupGenerator(const Element &base) {AccessBasePrecomputation().SetBase(GetGroupPrecomputation(), base);}
virtual Element ExponentiateBase(const Integer &exponent) const
{
return GetBasePrecomputation().Exponentiate(GetGroupPrecomputation(), exponent);
}
virtual Element ExponentiateElement(const Element &base, const Integer &exponent) const
{
Element result;
SimultaneousExponentiate(&result, base, &exponent, 1);
return result;
}
virtual const DL_GroupPrecomputation<Element> & GetGroupPrecomputation() const =0;
virtual const DL_FixedBasePrecomputation<Element> & GetBasePrecomputation() const =0;
virtual DL_FixedBasePrecomputation<Element> & AccessBasePrecomputation() =0;
virtual const Integer & GetSubgroupOrder() const =0; // order of subgroup generated by base element
virtual Integer GetMaxExponent() const =0;
virtual Integer GetGroupOrder() const {return GetSubgroupOrder()*GetCofactor();} // one of these two needs to be overriden
virtual Integer GetCofactor() const {return GetGroupOrder()/GetSubgroupOrder();}
virtual unsigned int GetEncodedElementSize(bool reversible) const =0;
virtual void EncodeElement(bool reversible, const Element &element, byte *encoded) const =0;
virtual Element DecodeElement(const byte *encoded, bool checkForGroupMembership) const =0;
virtual Integer ConvertElementToInteger(const Element &element) const =0;
virtual bool ValidateGroup(RandomNumberGenerator &rng, unsigned int level) const =0;
virtual bool ValidateElement(unsigned int level, const Element &element, const DL_FixedBasePrecomputation<Element> *precomp) const =0;
virtual bool FastSubgroupCheckAvailable() const =0;
virtual bool IsIdentity(const Element &element) const =0;
virtual void SimultaneousExponentiate(Element *results, const Element &base, const Integer *exponents, unsigned int exponentsCount) const =0;
protected:
void ParametersChanged() {m_validationLevel = 0;}
private:
mutable unsigned int m_validationLevel;
};
//! _
template <class GROUP_PRECOMP, class BASE_PRECOMP = DL_FixedBasePrecomputationImpl<CPP_TYPENAME GROUP_PRECOMP::Element>, class BASE = DL_GroupParameters<CPP_TYPENAME GROUP_PRECOMP::Element> >
class DL_GroupParametersImpl : public BASE
{
public:
typedef GROUP_PRECOMP GroupPrecomputation;
typedef typename GROUP_PRECOMP::Element Element;
typedef BASE_PRECOMP BasePrecomputation;
const DL_GroupPrecomputation<Element> & GetGroupPrecomputation() const {return m_groupPrecomputation;}
const DL_FixedBasePrecomputation<Element> & GetBasePrecomputation() const {return m_gpc;}
DL_FixedBasePrecomputation<Element> & AccessBasePrecomputation() {return m_gpc;}
protected:
GROUP_PRECOMP m_groupPrecomputation;
BASE_PRECOMP m_gpc;
};
//! _
template <class T>
class CRYPTOPP_NO_VTABLE DL_Key
{
public:
virtual const DL_GroupParameters<T> & GetAbstractGroupParameters() const =0;
virtual DL_GroupParameters<T> & AccessAbstractGroupParameters() =0;
};
//! interface for DL public keys
template <class T>
class CRYPTOPP_NO_VTABLE DL_PublicKey : public DL_Key<T>
{
typedef DL_PublicKey<T> ThisClass;
public:
typedef T Element;
bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const
{
return GetValueHelper(this, name, valueType, pValue, &this->GetAbstractGroupParameters())
CRYPTOPP_GET_FUNCTION_ENTRY(PublicElement);
}
void AssignFrom(const NameValuePairs &source);
// non-inherited
virtual const Element & GetPublicElement() const {return GetPublicPrecomputation().GetBase(this->GetAbstractGroupParameters().GetGroupPrecomputation());}
virtual void SetPublicElement(const Element &y) {AccessPublicPrecomputation().SetBase(this->GetAbstractGroupParameters().GetGroupPrecomputation(), y);}
virtual Element ExponentiatePublicElement(const Integer &exponent) const
{
const DL_GroupParameters<T> ¶ms = this->GetAbstractGroupParameters();
return GetPublicPrecomputation().Exponentiate(params.GetGroupPrecomputation(), exponent);
}
virtual Element CascadeExponentiateBaseAndPublicElement(const Integer &baseExp, const Integer &publicExp) const
{
const DL_GroupParameters<T> ¶ms = this->GetAbstractGroupParameters();
return params.GetBasePrecomputation().CascadeExponentiate(params.GetGroupPrecomputation(), baseExp, GetPublicPrecomputation(), publicExp);
}
virtual const DL_FixedBasePrecomputation<T> & GetPublicPrecomputation() const =0;
virtual DL_FixedBasePrecomputation<T> & AccessPublicPrecomputation() =0;
};
//! interface for DL private keys
template <class T>
class CRYPTOPP_NO_VTABLE DL_PrivateKey : public DL_Key<T>
{
typedef DL_PrivateKey<T> ThisClass;
public:
typedef T Element;
void MakePublicKey(DL_PublicKey<T> &pub) const
{
pub.AccessAbstractGroupParameters().AssignFrom(this->GetAbstractGroupParameters());
pub.SetPublicElement(this->GetAbstractGroupParameters().ExponentiateBase(GetPrivateExponent()));
}
bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const
{
return GetValueHelper(this, name, valueType, pValue, &this->GetAbstractGroupParameters())
CRYPTOPP_GET_FUNCTION_ENTRY(PrivateExponent);
}
void AssignFrom(const NameValuePairs &source)
{
this->AccessAbstractGroupParameters().AssignFrom(source);
AssignFromHelper(this, source)
CRYPTOPP_SET_FUNCTION_ENTRY(PrivateExponent);
}
virtual const Integer & GetPrivateExponent() const =0;
virtual void SetPrivateExponent(const Integer &x) =0;
};
template <class T>
void DL_PublicKey<T>::AssignFrom(const NameValuePairs &source)
{
DL_PrivateKey<T> *pPrivateKey = NULL;
if (source.GetThisPointer(pPrivateKey))
pPrivateKey->MakePublicKey(*this);
else
{
this->AccessAbstractGroupParameters().AssignFrom(source);
AssignFromHelper(this, source)
CRYPTOPP_SET_FUNCTION_ENTRY(PublicElement);
}
}
class OID;
//! _
template <class PK, class GP, class O = OID>
class DL_KeyImpl : public PK
{
public:
typedef GP GroupParameters;
O GetAlgorithmID() const {return GetGroupParameters().GetAlgorithmID();}
// void BERDecode(BufferedTransformation &bt)
// {PK::BERDecode(bt);}
// void DEREncode(BufferedTransformation &bt) const
// {PK::DEREncode(bt);}
bool BERDecodeAlgorithmParameters(BufferedTransformation &bt)
{AccessGroupParameters().BERDecode(bt); return true;}
bool DEREncodeAlgorithmParameters(BufferedTransformation &bt) const
{GetGroupParameters().DEREncode(bt); return true;}
const GP & GetGroupParameters() const {return m_groupParameters;}
GP & AccessGroupParameters() {return m_groupParameters;}
private:
GP m_groupParameters;
};
class X509PublicKey;
class PKCS8PrivateKey;
//! _
template <class GP>
class DL_PrivateKeyImpl : public DL_PrivateKey<CPP_TYPENAME GP::Element>, public DL_KeyImpl<PKCS8PrivateKey, GP>
{
public:
typedef typename GP::Element Element;
// GeneratableCryptoMaterial
bool Validate(RandomNumberGenerator &rng, unsigned int level) const
{
bool pass = GetAbstractGroupParameters().Validate(rng, level);
const Integer &q = GetAbstractGroupParameters().GetSubgroupOrder();
const Integer &x = GetPrivateExponent();
pass = pass && x.IsPositive() && x < q;
if (level >= 1)
pass = pass && Integer::Gcd(x, q) == Integer::One();
return pass;
}
bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const
{
return GetValueHelper<DL_PrivateKey<Element> >(this, name, valueType, pValue).Assignable();
}
void AssignFrom(const NameValuePairs &source)
{
AssignFromHelper<DL_PrivateKey<Element> >(this, source);
}
void GenerateRandom(RandomNumberGenerator &rng, const NameValuePairs ¶ms)
{
if (!params.GetThisObject(this->AccessGroupParameters()))
this->AccessGroupParameters().GenerateRandom(rng, params);
// std::pair<const byte *, int> seed;
Integer x(rng, Integer::One(), GetAbstractGroupParameters().GetMaxExponent());
// Integer::ANY, Integer::Zero(), Integer::One(),
// params.GetValue("DeterministicKeyGenerationSeed", seed) ? &seed : NULL);
SetPrivateExponent(x);
}
bool SupportsPrecomputation() const {return true;}
void Precompute(unsigned int precomputationStorage=16)
{AccessAbstractGroupParameters().Precompute(precomputationStorage);}
void LoadPrecomputation(BufferedTransformation &storedPrecomputation)
{AccessAbstractGroupParameters().LoadPrecomputation(storedPrecomputation);}
void SavePrecomputation(BufferedTransformation &storedPrecomputation) const
{GetAbstractGroupParameters().SavePrecomputation(storedPrecomputation);}
// DL_Key
const DL_GroupParameters<Element> & GetAbstractGroupParameters() const {return this->GetGroupParameters();}
DL_GroupParameters<Element> & AccessAbstractGroupParameters() {return this->AccessGroupParameters();}
// DL_PrivateKey
const Integer & GetPrivateExponent() const {return m_x;}
void SetPrivateExponent(const Integer &x) {m_x = x;}
// PKCS8PrivateKey
void BERDecodePrivateKey(BufferedTransformation &bt, bool, size_t)
{m_x.BERDecode(bt);}
void DEREncodePrivateKey(BufferedTransformation &bt) const
{m_x.DEREncode(bt);}
private:
Integer m_x;
};
//! _
template <class BASE, class SIGNATURE_SCHEME>
class DL_PrivateKey_WithSignaturePairwiseConsistencyTest : public BASE
{
public:
void GenerateRandom(RandomNumberGenerator &rng, const NameValuePairs ¶ms)
{
BASE::GenerateRandom(rng, params);
if (FIPS_140_2_ComplianceEnabled())
{
typename SIGNATURE_SCHEME::Signer signer(*this);
typename SIGNATURE_SCHEME::Verifier verifier(signer);
SignaturePairwiseConsistencyTest_FIPS_140_Only(signer, verifier);
}
}
};
//! _
template <class GP>
class DL_PublicKeyImpl : public DL_PublicKey<typename GP::Element>, public DL_KeyImpl<X509PublicKey, GP>
{
public:
typedef typename GP::Element Element;
// CryptoMaterial
bool Validate(RandomNumberGenerator &rng, unsigned int level) const
{
bool pass = GetAbstractGroupParameters().Validate(rng, level);
pass = pass && GetAbstractGroupParameters().ValidateElement(level, this->GetPublicElement(), &GetPublicPrecomputation());
return pass;
}
bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const
{
return GetValueHelper<DL_PublicKey<Element> >(this, name, valueType, pValue).Assignable();
}
void AssignFrom(const NameValuePairs &source)
{
AssignFromHelper<DL_PublicKey<Element> >(this, source);
}
bool SupportsPrecomputation() const {return true;}
void Precompute(unsigned int precomputationStorage=16)
{
AccessAbstractGroupParameters().Precompute(precomputationStorage);
AccessPublicPrecomputation().Precompute(GetAbstractGroupParameters().GetGroupPrecomputation(), GetAbstractGroupParameters().GetSubgroupOrder().BitCount(), precomputationStorage);
}
void LoadPrecomputation(BufferedTransformation &storedPrecomputation)
{
AccessAbstractGroupParameters().LoadPrecomputation(storedPrecomputation);
AccessPublicPrecomputation().Load(GetAbstractGroupParameters().GetGroupPrecomputation(), storedPrecomputation);
}
void SavePrecomputation(BufferedTransformation &storedPrecomputation) const
{
GetAbstractGroupParameters().SavePrecomputation(storedPrecomputation);
GetPublicPrecomputation().Save(GetAbstractGroupParameters().GetGroupPrecomputation(), storedPrecomputation);
}
// DL_Key
const DL_GroupParameters<Element> & GetAbstractGroupParameters() const {return this->GetGroupParameters();}
DL_GroupParameters<Element> & AccessAbstractGroupParameters() {return this->AccessGroupParameters();}
// DL_PublicKey
const DL_FixedBasePrecomputation<Element> & GetPublicPrecomputation() const {return m_ypc;}
DL_FixedBasePrecomputation<Element> & AccessPublicPrecomputation() {return m_ypc;}
// non-inherited
bool operator==(const DL_PublicKeyImpl<GP> &rhs) const
{return this->GetGroupParameters() == rhs.GetGroupParameters() && this->GetPublicElement() == rhs.GetPublicElement();}
private:
typename GP::BasePrecomputation m_ypc;
};
//! interface for Elgamal-like signature algorithms
template <class T>
class CRYPTOPP_NO_VTABLE DL_ElgamalLikeSignatureAlgorithm
{
public:
virtual void Sign(const DL_GroupParameters<T> ¶ms, const Integer &privateKey, const Integer &k, const Integer &e, Integer &r, Integer &s) const =0;
virtual bool Verify(const DL_GroupParameters<T> ¶ms, const DL_PublicKey<T> &publicKey, const Integer &e, const Integer &r, const Integer &s) const =0;
virtual Integer RecoverPresignature(const DL_GroupParameters<T> ¶ms, const DL_PublicKey<T> &publicKey, const Integer &r, const Integer &s) const
{throw NotImplemented("DL_ElgamalLikeSignatureAlgorithm: this signature scheme does not support message recovery");}
virtual size_t RLen(const DL_GroupParameters<T> ¶ms) const
{return params.GetSubgroupOrder().ByteCount();}
virtual size_t SLen(const DL_GroupParameters<T> ¶ms) const
{return params.GetSubgroupOrder().ByteCount();}
};
//! interface for DL key agreement algorithms
template <class T>
class CRYPTOPP_NO_VTABLE DL_KeyAgreementAlgorithm
{
public:
typedef T Element;
virtual Element AgreeWithEphemeralPrivateKey(const DL_GroupParameters<Element> ¶ms, const DL_FixedBasePrecomputation<Element> &publicPrecomputation, const Integer &privateExponent) const =0;
virtual Element AgreeWithStaticPrivateKey(const DL_GroupParameters<Element> ¶ms, const Element &publicElement, bool validateOtherPublicKey, const Integer &privateExponent) const =0;
};
//! interface for key derivation algorithms used in DL cryptosystems
template <class T>
class CRYPTOPP_NO_VTABLE DL_KeyDerivationAlgorithm
{
public:
virtual bool ParameterSupported(const char *name) const {return false;}
virtual void Derive(const DL_GroupParameters<T> &groupParams, byte *derivedKey, size_t derivedLength, const T &agreedElement, const T &ephemeralPublicKey, const NameValuePairs &derivationParams) const =0;
};
//! interface for symmetric encryption algorithms used in DL cryptosystems
class CRYPTOPP_NO_VTABLE DL_SymmetricEncryptionAlgorithm
{
public:
virtual bool ParameterSupported(const char *name) const {return false;}
virtual size_t GetSymmetricKeyLength(size_t plaintextLength) const =0;
virtual size_t GetSymmetricCiphertextLength(size_t plaintextLength) const =0;
virtual size_t GetMaxSymmetricPlaintextLength(size_t ciphertextLength) const =0;
virtual void SymmetricEncrypt(RandomNumberGenerator &rng, const byte *key, const byte *plaintext, size_t plaintextLength, byte *ciphertext, const NameValuePairs ¶meters) const =0;
virtual DecodingResult SymmetricDecrypt(const byte *key, const byte *ciphertext, size_t ciphertextLength, byte *plaintext, const NameValuePairs ¶meters) const =0;
};
//! _
template <class KI>
class CRYPTOPP_NO_VTABLE DL_Base
{
protected:
typedef KI KeyInterface;
typedef typename KI::Element Element;
const DL_GroupParameters<Element> & GetAbstractGroupParameters() const {return GetKeyInterface().GetAbstractGroupParameters();}
DL_GroupParameters<Element> & AccessAbstractGroupParameters() {return AccessKeyInterface().AccessAbstractGroupParameters();}
virtual KeyInterface & AccessKeyInterface() =0;
virtual const KeyInterface & GetKeyInterface() const =0;
};
//! _
template <class INTERFACE, class KEY_INTERFACE>
class CRYPTOPP_NO_VTABLE DL_SignatureSchemeBase : public INTERFACE, public DL_Base<KEY_INTERFACE>
{
public:
size_t SignatureLength() const
{
return GetSignatureAlgorithm().RLen(this->GetAbstractGroupParameters())
+ GetSignatureAlgorithm().SLen(this->GetAbstractGroupParameters());
}
size_t MaxRecoverableLength() const
{return GetMessageEncodingInterface().MaxRecoverableLength(0, GetHashIdentifier().second, GetDigestSize());}
size_t MaxRecoverableLengthFromSignatureLength(size_t signatureLength) const
{assert(false); return 0;} // TODO
bool IsProbabilistic() const
{return true;}
bool AllowNonrecoverablePart() const
{return GetMessageEncodingInterface().AllowNonrecoverablePart();}
bool RecoverablePartFirst() const
{return GetMessageEncodingInterface().RecoverablePartFirst();}
protected:
size_t MessageRepresentativeLength() const {return BitsToBytes(MessageRepresentativeBitLength());}
size_t MessageRepresentativeBitLength() const {return this->GetAbstractGroupParameters().GetSubgroupOrder().BitCount();}
virtual const DL_ElgamalLikeSignatureAlgorithm<CPP_TYPENAME KEY_INTERFACE::Element> & GetSignatureAlgorithm() const =0;
virtual const PK_SignatureMessageEncodingMethod & GetMessageEncodingInterface() const =0;
virtual HashIdentifier GetHashIdentifier() const =0;
virtual size_t GetDigestSize() const =0;
};
//! _
template <class T>
class CRYPTOPP_NO_VTABLE DL_SignerBase : public DL_SignatureSchemeBase<PK_Signer, DL_PrivateKey<T> >
{
public:
// for validation testing
void RawSign(const Integer &k, const Integer &e, Integer &r, Integer &s) const
{
const DL_ElgamalLikeSignatureAlgorithm<T> &alg = this->GetSignatureAlgorithm();
const DL_GroupParameters<T> ¶ms = this->GetAbstractGroupParameters();
const DL_PrivateKey<T> &key = this->GetKeyInterface();
r = params.ConvertElementToInteger(params.ExponentiateBase(k));
alg.Sign(params, key.GetPrivateExponent(), k, e, r, s);
}
void InputRecoverableMessage(PK_MessageAccumulator &messageAccumulator, const byte *recoverableMessage, size_t recoverableMessageLength) const
{
PK_MessageAccumulatorBase &ma = static_cast<PK_MessageAccumulatorBase &>(messageAccumulator);
ma.m_recoverableMessage.Assign(recoverableMessage, recoverableMessageLength);
this->GetMessageEncodingInterface().ProcessRecoverableMessage(ma.AccessHash(),
recoverableMessage, recoverableMessageLength,
ma.m_presignature, ma.m_presignature.size(),
ma.m_semisignature);
}
size_t SignAndRestart(RandomNumberGenerator &rng, PK_MessageAccumulator &messageAccumulator, byte *signature, bool restart) const
{
this->GetMaterial().DoQuickSanityCheck();
PK_MessageAccumulatorBase &ma = static_cast<PK_MessageAccumulatorBase &>(messageAccumulator);
const DL_ElgamalLikeSignatureAlgorithm<T> &alg = this->GetSignatureAlgorithm();
const DL_GroupParameters<T> ¶ms = this->GetAbstractGroupParameters();
const DL_PrivateKey<T> &key = this->GetKeyInterface();
SecByteBlock representative(this->MessageRepresentativeLength());
this->GetMessageEncodingInterface().ComputeMessageRepresentative(
rng,
ma.m_recoverableMessage, ma.m_recoverableMessage.size(),
ma.AccessHash(), this->GetHashIdentifier(), ma.m_empty,
representative, this->MessageRepresentativeBitLength());
ma.m_empty = true;
Integer e(representative, representative.size());
// hash message digest into random number k to prevent reusing the same k on a different messages
// after virtual machine rollback
if (rng.CanIncorporateEntropy())
rng.IncorporateEntropy(representative, representative.size());
Integer k(rng, 1, params.GetSubgroupOrder()-1);
Integer r, s;
r = params.ConvertElementToInteger(params.ExponentiateBase(k));
alg.Sign(params, key.GetPrivateExponent(), k, e, r, s);
/*
Integer r, s;
if (this->MaxRecoverableLength() > 0)
r.Decode(ma.m_semisignature, ma.m_semisignature.size());
else
r.Decode(ma.m_presignature, ma.m_presignature.size());
alg.Sign(params, key.GetPrivateExponent(), ma.m_k, e, r, s);
*/
size_t rLen = alg.RLen(params);
r.Encode(signature, rLen);
s.Encode(signature+rLen, alg.SLen(params));
if (restart)
RestartMessageAccumulator(rng, ma);
return this->SignatureLength();
}
protected:
void RestartMessageAccumulator(RandomNumberGenerator &rng, PK_MessageAccumulatorBase &ma) const
{
// k needs to be generated before hashing for signature schemes with recovery
// but to defend against VM rollbacks we need to generate k after hashing.
// so this code is commented out, since no DL-based signature scheme with recovery
// has been implemented in Crypto++ anyway
/*
const DL_ElgamalLikeSignatureAlgorithm<T> &alg = this->GetSignatureAlgorithm();
const DL_GroupParameters<T> ¶ms = this->GetAbstractGroupParameters();
ma.m_k.Randomize(rng, 1, params.GetSubgroupOrder()-1);
ma.m_presignature.New(params.GetEncodedElementSize(false));
params.ConvertElementToInteger(params.ExponentiateBase(ma.m_k)).Encode(ma.m_presignature, ma.m_presignature.size());
*/
}
};
//! _
template <class T>
class CRYPTOPP_NO_VTABLE DL_VerifierBase : public DL_SignatureSchemeBase<PK_Verifier, DL_PublicKey<T> >
{
public:
void InputSignature(PK_MessageAccumulator &messageAccumulator, const byte *signature, size_t signatureLength) const
{
PK_MessageAccumulatorBase &ma = static_cast<PK_MessageAccumulatorBase &>(messageAccumulator);
const DL_ElgamalLikeSignatureAlgorithm<T> &alg = this->GetSignatureAlgorithm();
const DL_GroupParameters<T> ¶ms = this->GetAbstractGroupParameters();
size_t rLen = alg.RLen(params);
ma.m_semisignature.Assign(signature, rLen);
ma.m_s.Decode(signature+rLen, alg.SLen(params));
this->GetMessageEncodingInterface().ProcessSemisignature(ma.AccessHash(), ma.m_semisignature, ma.m_semisignature.size());
}
bool VerifyAndRestart(PK_MessageAccumulator &messageAccumulator) const
{
this->GetMaterial().DoQuickSanityCheck();
PK_MessageAccumulatorBase &ma = static_cast<PK_MessageAccumulatorBase &>(messageAccumulator);
const DL_ElgamalLikeSignatureAlgorithm<T> &alg = this->GetSignatureAlgorithm();
const DL_GroupParameters<T> ¶ms = this->GetAbstractGroupParameters();
const DL_PublicKey<T> &key = this->GetKeyInterface();
SecByteBlock representative(this->MessageRepresentativeLength());
this->GetMessageEncodingInterface().ComputeMessageRepresentative(NullRNG(), ma.m_recoverableMessage, ma.m_recoverableMessage.size(),
ma.AccessHash(), this->GetHashIdentifier(), ma.m_empty,
representative, this->MessageRepresentativeBitLength());
ma.m_empty = true;
Integer e(representative, representative.size());
Integer r(ma.m_semisignature, ma.m_semisignature.size());
return alg.Verify(params, key, e, r, ma.m_s);
}
DecodingResult RecoverAndRestart(byte *recoveredMessage, PK_MessageAccumulator &messageAccumulator) const
{
this->GetMaterial().DoQuickSanityCheck();
PK_MessageAccumulatorBase &ma = static_cast<PK_MessageAccumulatorBase &>(messageAccumulator);
const DL_ElgamalLikeSignatureAlgorithm<T> &alg = this->GetSignatureAlgorithm();
const DL_GroupParameters<T> ¶ms = this->GetAbstractGroupParameters();
const DL_PublicKey<T> &key = this->GetKeyInterface();
SecByteBlock representative(this->MessageRepresentativeLength());
this->GetMessageEncodingInterface().ComputeMessageRepresentative(
NullRNG(),
ma.m_recoverableMessage, ma.m_recoverableMessage.size(),
ma.AccessHash(), this->GetHashIdentifier(), ma.m_empty,
representative, this->MessageRepresentativeBitLength());
ma.m_empty = true;
Integer e(representative, representative.size());
ma.m_presignature.New(params.GetEncodedElementSize(false));
Integer r(ma.m_semisignature, ma.m_semisignature.size());
alg.RecoverPresignature(params, key, r, ma.m_s).Encode(ma.m_presignature, ma.m_presignature.size());
return this->GetMessageEncodingInterface().RecoverMessageFromSemisignature(
ma.AccessHash(), this->GetHashIdentifier(),
ma.m_presignature, ma.m_presignature.size(),
ma.m_semisignature, ma.m_semisignature.size(),
recoveredMessage);
}
};
//! _
template <class PK, class KI>
class CRYPTOPP_NO_VTABLE DL_CryptoSystemBase : public PK, public DL_Base<KI>
{
public:
typedef typename DL_Base<KI>::Element Element;
size_t MaxPlaintextLength(size_t ciphertextLength) const
{
unsigned int minLen = this->GetAbstractGroupParameters().GetEncodedElementSize(true);
return ciphertextLength < minLen ? 0 : GetSymmetricEncryptionAlgorithm().GetMaxSymmetricPlaintextLength(ciphertextLength - minLen);
}
size_t CiphertextLength(size_t plaintextLength) const
{
size_t len = GetSymmetricEncryptionAlgorithm().GetSymmetricCiphertextLength(plaintextLength);
return len == 0 ? 0 : this->GetAbstractGroupParameters().GetEncodedElementSize(true) + len;
}
bool ParameterSupported(const char *name) const
{return GetKeyDerivationAlgorithm().ParameterSupported(name) || GetSymmetricEncryptionAlgorithm().ParameterSupported(name);}
protected:
virtual const DL_KeyAgreementAlgorithm<Element> & GetKeyAgreementAlgorithm() const =0;
virtual const DL_KeyDerivationAlgorithm<Element> & GetKeyDerivationAlgorithm() const =0;
virtual const DL_SymmetricEncryptionAlgorithm & GetSymmetricEncryptionAlgorithm() const =0;
};
//! _
template <class T>
class CRYPTOPP_NO_VTABLE DL_DecryptorBase : public DL_CryptoSystemBase<PK_Decryptor, DL_PrivateKey<T> >
{
public:
typedef T Element;
DecodingResult Decrypt(RandomNumberGenerator &rng, const byte *ciphertext, size_t ciphertextLength, byte *plaintext, const NameValuePairs ¶meters = g_nullNameValuePairs) const
{
try
{
const DL_KeyAgreementAlgorithm<T> &agreeAlg = this->GetKeyAgreementAlgorithm();
const DL_KeyDerivationAlgorithm<T> &derivAlg = this->GetKeyDerivationAlgorithm();
const DL_SymmetricEncryptionAlgorithm &encAlg = this->GetSymmetricEncryptionAlgorithm();
const DL_GroupParameters<T> ¶ms = this->GetAbstractGroupParameters();
const DL_PrivateKey<T> &key = this->GetKeyInterface();
Element q = params.DecodeElement(ciphertext, true);
size_t elementSize = params.GetEncodedElementSize(true);
ciphertext += elementSize;
ciphertextLength -= elementSize;
Element z = agreeAlg.AgreeWithStaticPrivateKey(params, q, true, key.GetPrivateExponent());
SecByteBlock derivedKey(encAlg.GetSymmetricKeyLength(encAlg.GetMaxSymmetricPlaintextLength(ciphertextLength)));
derivAlg.Derive(params, derivedKey, derivedKey.size(), z, q, parameters);
return encAlg.SymmetricDecrypt(derivedKey, ciphertext, ciphertextLength, plaintext, parameters);
}
catch (DL_BadElement &)
{
return DecodingResult();
}
}
};
//! _
template <class T>
class CRYPTOPP_NO_VTABLE DL_EncryptorBase : public DL_CryptoSystemBase<PK_Encryptor, DL_PublicKey<T> >
{
public:
typedef T Element;
void Encrypt(RandomNumberGenerator &rng, const byte *plaintext, size_t plaintextLength, byte *ciphertext, const NameValuePairs ¶meters = g_nullNameValuePairs) const
{
const DL_KeyAgreementAlgorithm<T> &agreeAlg = this->GetKeyAgreementAlgorithm();
const DL_KeyDerivationAlgorithm<T> &derivAlg = this->GetKeyDerivationAlgorithm();
const DL_SymmetricEncryptionAlgorithm &encAlg = this->GetSymmetricEncryptionAlgorithm();
const DL_GroupParameters<T> ¶ms = this->GetAbstractGroupParameters();
const DL_PublicKey<T> &key = this->GetKeyInterface();
Integer x(rng, Integer::One(), params.GetMaxExponent());
Element q = params.ExponentiateBase(x);
params.EncodeElement(true, q, ciphertext);
unsigned int elementSize = params.GetEncodedElementSize(true);
ciphertext += elementSize;
Element z = agreeAlg.AgreeWithEphemeralPrivateKey(params, key.GetPublicPrecomputation(), x);
SecByteBlock derivedKey(encAlg.GetSymmetricKeyLength(plaintextLength));
derivAlg.Derive(params, derivedKey, derivedKey.size(), z, q, parameters);
encAlg.SymmetricEncrypt(rng, derivedKey, plaintext, plaintextLength, ciphertext, parameters);
}
};
//! _
template <class T1, class T2>
struct DL_SchemeOptionsBase
{
typedef T1 AlgorithmInfo;
typedef T2 GroupParameters;
typedef typename GroupParameters::Element Element;
};
//! _
template <class T1, class T2>
struct DL_KeyedSchemeOptions : public DL_SchemeOptionsBase<T1, typename T2::PublicKey::GroupParameters>
{
typedef T2 Keys;
typedef typename Keys::PrivateKey PrivateKey;
typedef typename Keys::PublicKey PublicKey;
};
//! _
template <class T1, class T2, class T3, class T4, class T5>
struct DL_SignatureSchemeOptions : public DL_KeyedSchemeOptions<T1, T2>
{
typedef T3 SignatureAlgorithm;
typedef T4 MessageEncodingMethod;
typedef T5 HashFunction;
};
//! _
template <class T1, class T2, class T3, class T4, class T5>
struct DL_CryptoSchemeOptions : public DL_KeyedSchemeOptions<T1, T2>
{
typedef T3 KeyAgreementAlgorithm;
typedef T4 KeyDerivationAlgorithm;
typedef T5 SymmetricEncryptionAlgorithm;
};
//! _
template <class BASE, class SCHEME_OPTIONS, class KEY>
class CRYPTOPP_NO_VTABLE DL_ObjectImplBase : public AlgorithmImpl<BASE, typename SCHEME_OPTIONS::AlgorithmInfo>
{
public:
typedef SCHEME_OPTIONS SchemeOptions;
typedef typename KEY::Element Element;
PrivateKey & AccessPrivateKey() {return m_key;}
PublicKey & AccessPublicKey() {return m_key;}
// KeyAccessor
const KEY & GetKey() const {return m_key;}
KEY & AccessKey() {return m_key;}
protected:
typename BASE::KeyInterface & AccessKeyInterface() {return m_key;}
const typename BASE::KeyInterface & GetKeyInterface() const {return m_key;}
// for signature scheme
HashIdentifier GetHashIdentifier() const
{
typedef typename SchemeOptions::MessageEncodingMethod::HashIdentifierLookup HashLookup;
return HashLookup::template HashIdentifierLookup2<CPP_TYPENAME SchemeOptions::HashFunction>::Lookup();
}
size_t GetDigestSize() const
{
typedef CPP_TYPENAME SchemeOptions::HashFunction H;
return H::DIGESTSIZE;
}
private:
KEY m_key;
};
//! _
template <class BASE, class SCHEME_OPTIONS, class KEY>
class CRYPTOPP_NO_VTABLE DL_ObjectImpl : public DL_ObjectImplBase<BASE, SCHEME_OPTIONS, KEY>
{
public:
typedef typename KEY::Element Element;
protected:
const DL_ElgamalLikeSignatureAlgorithm<Element> & GetSignatureAlgorithm() const
{return Singleton<CPP_TYPENAME SCHEME_OPTIONS::SignatureAlgorithm>().Ref();}
const DL_KeyAgreementAlgorithm<Element> & GetKeyAgreementAlgorithm() const
{return Singleton<CPP_TYPENAME SCHEME_OPTIONS::KeyAgreementAlgorithm>().Ref();}
const DL_KeyDerivationAlgorithm<Element> & GetKeyDerivationAlgorithm() const
{return Singleton<CPP_TYPENAME SCHEME_OPTIONS::KeyDerivationAlgorithm>().Ref();}
const DL_SymmetricEncryptionAlgorithm & GetSymmetricEncryptionAlgorithm() const
{return Singleton<CPP_TYPENAME SCHEME_OPTIONS::SymmetricEncryptionAlgorithm>().Ref();}
HashIdentifier GetHashIdentifier() const
{return HashIdentifier();}
const PK_SignatureMessageEncodingMethod & GetMessageEncodingInterface() const
{return Singleton<CPP_TYPENAME SCHEME_OPTIONS::MessageEncodingMethod>().Ref();}
};
//! _
template <class SCHEME_OPTIONS>
class DL_SignerImpl : public DL_ObjectImpl<DL_SignerBase<typename SCHEME_OPTIONS::Element>, SCHEME_OPTIONS, typename SCHEME_OPTIONS::PrivateKey>
{
public:
PK_MessageAccumulator * NewSignatureAccumulator(RandomNumberGenerator &rng) const
{
std::auto_ptr<PK_MessageAccumulatorBase> p(new PK_MessageAccumulatorImpl<CPP_TYPENAME SCHEME_OPTIONS::HashFunction>);
this->RestartMessageAccumulator(rng, *p);
return p.release();
}
};
//! _
template <class SCHEME_OPTIONS>
class DL_VerifierImpl : public DL_ObjectImpl<DL_VerifierBase<typename SCHEME_OPTIONS::Element>, SCHEME_OPTIONS, typename SCHEME_OPTIONS::PublicKey>
{
public:
PK_MessageAccumulator * NewVerificationAccumulator() const
{
return new PK_MessageAccumulatorImpl<CPP_TYPENAME SCHEME_OPTIONS::HashFunction>;
}
};
//! _
template <class SCHEME_OPTIONS>
class DL_EncryptorImpl : public DL_ObjectImpl<DL_EncryptorBase<typename SCHEME_OPTIONS::Element>, SCHEME_OPTIONS, typename SCHEME_OPTIONS::PublicKey>
{
};
//! _
template <class SCHEME_OPTIONS>
class DL_DecryptorImpl : public DL_ObjectImpl<DL_DecryptorBase<typename SCHEME_OPTIONS::Element>, SCHEME_OPTIONS, typename SCHEME_OPTIONS::PrivateKey>
{
};
// ********************************************************
//! _
template <class T>
class CRYPTOPP_NO_VTABLE DL_SimpleKeyAgreementDomainBase : public SimpleKeyAgreementDomain
{
public:
typedef T Element;
CryptoParameters & AccessCryptoParameters() {return AccessAbstractGroupParameters();}
unsigned int AgreedValueLength() const {return GetAbstractGroupParameters().GetEncodedElementSize(false);}
unsigned int PrivateKeyLength() const {return GetAbstractGroupParameters().GetSubgroupOrder().ByteCount();}
unsigned int PublicKeyLength() const {return GetAbstractGroupParameters().GetEncodedElementSize(true);}
void GeneratePrivateKey(RandomNumberGenerator &rng, byte *privateKey) const
{
Integer x(rng, Integer::One(), GetAbstractGroupParameters().GetMaxExponent());
x.Encode(privateKey, PrivateKeyLength());
}
void GeneratePublicKey(RandomNumberGenerator &rng, const byte *privateKey, byte *publicKey) const
{
const DL_GroupParameters<T> ¶ms = GetAbstractGroupParameters();
Integer x(privateKey, PrivateKeyLength());
Element y = params.ExponentiateBase(x);
params.EncodeElement(true, y, publicKey);
}
bool Agree(byte *agreedValue, const byte *privateKey, const byte *otherPublicKey, bool validateOtherPublicKey=true) const
{
try
{
const DL_GroupParameters<T> ¶ms = GetAbstractGroupParameters();
Integer x(privateKey, PrivateKeyLength());
Element w = params.DecodeElement(otherPublicKey, validateOtherPublicKey);
Element z = GetKeyAgreementAlgorithm().AgreeWithStaticPrivateKey(
GetAbstractGroupParameters(), w, validateOtherPublicKey, x);
params.EncodeElement(false, z, agreedValue);
}
catch (DL_BadElement &)
{
return false;
}
return true;
}
const Element &GetGenerator() const {return GetAbstractGroupParameters().GetSubgroupGenerator();}
protected:
virtual const DL_KeyAgreementAlgorithm<Element> & GetKeyAgreementAlgorithm() const =0;
virtual DL_GroupParameters<Element> & AccessAbstractGroupParameters() =0;
const DL_GroupParameters<Element> & GetAbstractGroupParameters() const {return const_cast<DL_SimpleKeyAgreementDomainBase<Element> *>(this)->AccessAbstractGroupParameters();}
};
enum CofactorMultiplicationOption {NO_COFACTOR_MULTIPLICTION, COMPATIBLE_COFACTOR_MULTIPLICTION, INCOMPATIBLE_COFACTOR_MULTIPLICTION};
typedef EnumToType<CofactorMultiplicationOption, NO_COFACTOR_MULTIPLICTION> NoCofactorMultiplication;
typedef EnumToType<CofactorMultiplicationOption, COMPATIBLE_COFACTOR_MULTIPLICTION> CompatibleCofactorMultiplication;
typedef EnumToType<CofactorMultiplicationOption, INCOMPATIBLE_COFACTOR_MULTIPLICTION> IncompatibleCofactorMultiplication;
//! DH key agreement algorithm
template <class ELEMENT, class COFACTOR_OPTION>
class DL_KeyAgreementAlgorithm_DH : public DL_KeyAgreementAlgorithm<ELEMENT>
{
public:
typedef ELEMENT Element;
static const char * CRYPTOPP_API StaticAlgorithmName()
{return COFACTOR_OPTION::ToEnum() == INCOMPATIBLE_COFACTOR_MULTIPLICTION ? "DHC" : "DH";}
Element AgreeWithEphemeralPrivateKey(const DL_GroupParameters<Element> ¶ms, const DL_FixedBasePrecomputation<Element> &publicPrecomputation, const Integer &privateExponent) const
{
return publicPrecomputation.Exponentiate(params.GetGroupPrecomputation(),
COFACTOR_OPTION::ToEnum() == INCOMPATIBLE_COFACTOR_MULTIPLICTION ? privateExponent*params.GetCofactor() : privateExponent);
}
Element AgreeWithStaticPrivateKey(const DL_GroupParameters<Element> ¶ms, const Element &publicElement, bool validateOtherPublicKey, const Integer &privateExponent) const
{
if (COFACTOR_OPTION::ToEnum() == COMPATIBLE_COFACTOR_MULTIPLICTION)
{
const Integer &k = params.GetCofactor();
return params.ExponentiateElement(publicElement,
ModularArithmetic(params.GetSubgroupOrder()).Divide(privateExponent, k)*k);
}
else if (COFACTOR_OPTION::ToEnum() == INCOMPATIBLE_COFACTOR_MULTIPLICTION)
return params.ExponentiateElement(publicElement, privateExponent*params.GetCofactor());
else
{
assert(COFACTOR_OPTION::ToEnum() == NO_COFACTOR_MULTIPLICTION);
if (!validateOtherPublicKey)
return params.ExponentiateElement(publicElement, privateExponent);
if (params.FastSubgroupCheckAvailable())
{
if (!params.ValidateElement(2, publicElement, NULL))
throw DL_BadElement();
return params.ExponentiateElement(publicElement, privateExponent);
}
else
{
const Integer e[2] = {params.GetSubgroupOrder(), privateExponent};
Element r[2];
params.SimultaneousExponentiate(r, publicElement, e, 2);
if (!params.IsIdentity(r[0]))
throw DL_BadElement();
return r[1];
}
}
}
};
// ********************************************************
//! A template implementing constructors for public key algorithm classes
template <class BASE>
class CRYPTOPP_NO_VTABLE PK_FinalTemplate : public BASE
{
public:
PK_FinalTemplate() {}
PK_FinalTemplate(const CryptoMaterial &key)
{this->AccessKey().AssignFrom(key);}
PK_FinalTemplate(BufferedTransformation &bt)
{this->AccessKey().BERDecode(bt);}
PK_FinalTemplate(const AsymmetricAlgorithm &algorithm)
{this->AccessKey().AssignFrom(algorithm.GetMaterial());}
PK_FinalTemplate(const Integer &v1)
{this->AccessKey().Initialize(v1);}
#if (defined(_MSC_VER) && _MSC_VER < 1300)
template <class T1, class T2>
PK_FinalTemplate(T1 &v1, T2 &v2)
{this->AccessKey().Initialize(v1, v2);}
template <class T1, class T2, class T3>
PK_FinalTemplate(T1 &v1, T2 &v2, T3 &v3)
{this->AccessKey().Initialize(v1, v2, v3);}
template <class T1, class T2, class T3, class T4>
PK_FinalTemplate(T1 &v1, T2 &v2, T3 &v3, T4 &v4)
{this->AccessKey().Initialize(v1, v2, v3, v4);}
template <class T1, class T2, class T3, class T4, class T5>
PK_FinalTemplate(T1 &v1, T2 &v2, T3 &v3, T4 &v4, T5 &v5)
{this->AccessKey().Initialize(v1, v2, v3, v4, v5);}
template <class T1, class T2, class T3, class T4, class T5, class T6>
PK_FinalTemplate(T1 &v1, T2 &v2, T3 &v3, T4 &v4, T5 &v5, T6 &v6)
{this->AccessKey().Initialize(v1, v2, v3, v4, v5, v6);}
template <class T1, class T2, class T3, class T4, class T5, class T6, class T7>
PK_FinalTemplate(T1 &v1, T2 &v2, T3 &v3, T4 &v4, T5 &v5, T6 &v6, T7 &v7)
{this->AccessKey().Initialize(v1, v2, v3, v4, v5, v6, v7);}
template <class T1, class T2, class T3, class T4, class T5, class T6, class T7, class T8>
PK_FinalTemplate(T1 &v1, T2 &v2, T3 &v3, T4 &v4, T5 &v5, T6 &v6, T7 &v7, T8 &v8)
{this->AccessKey().Initialize(v1, v2, v3, v4, v5, v6, v7, v8);}
#else
template <class T1, class T2>
PK_FinalTemplate(const T1 &v1, const T2 &v2)
{this->AccessKey().Initialize(v1, v2);}
template <class T1, class T2, class T3>
PK_FinalTemplate(const T1 &v1, const T2 &v2, const T3 &v3)
{this->AccessKey().Initialize(v1, v2, v3);}
template <class T1, class T2, class T3, class T4>
PK_FinalTemplate(const T1 &v1, const T2 &v2, const T3 &v3, const T4 &v4)
{this->AccessKey().Initialize(v1, v2, v3, v4);}
template <class T1, class T2, class T3, class T4, class T5>
PK_FinalTemplate(const T1 &v1, const T2 &v2, const T3 &v3, const T4 &v4, const T5 &v5)
{this->AccessKey().Initialize(v1, v2, v3, v4, v5);}
template <class T1, class T2, class T3, class T4, class T5, class T6>
PK_FinalTemplate(const T1 &v1, const T2 &v2, const T3 &v3, const T4 &v4, const T5 &v5, const T6 &v6)
{this->AccessKey().Initialize(v1, v2, v3, v4, v5, v6);}
template <class T1, class T2, class T3, class T4, class T5, class T6, class T7>
PK_FinalTemplate(const T1 &v1, const T2 &v2, const T3 &v3, const T4 &v4, const T5 &v5, const T6 &v6, const T7 &v7)
{this->AccessKey().Initialize(v1, v2, v3, v4, v5, v6, v7);}
template <class T1, class T2, class T3, class T4, class T5, class T6, class T7, class T8>
PK_FinalTemplate(const T1 &v1, const T2 &v2, const T3 &v3, const T4 &v4, const T5 &v5, const T6 &v6, const T7 &v7, const T8 &v8)
{this->AccessKey().Initialize(v1, v2, v3, v4, v5, v6, v7, v8);}
template <class T1, class T2>
PK_FinalTemplate(T1 &v1, const T2 &v2)
{this->AccessKey().Initialize(v1, v2);}
template <class T1, class T2, class T3>
PK_FinalTemplate(T1 &v1, const T2 &v2, const T3 &v3)
{this->AccessKey().Initialize(v1, v2, v3);}
template <class T1, class T2, class T3, class T4>
PK_FinalTemplate(T1 &v1, const T2 &v2, const T3 &v3, const T4 &v4)
{this->AccessKey().Initialize(v1, v2, v3, v4);}
template <class T1, class T2, class T3, class T4, class T5>
PK_FinalTemplate(T1 &v1, const T2 &v2, const T3 &v3, const T4 &v4, const T5 &v5)
{this->AccessKey().Initialize(v1, v2, v3, v4, v5);}
template <class T1, class T2, class T3, class T4, class T5, class T6>
PK_FinalTemplate(T1 &v1, const T2 &v2, const T3 &v3, const T4 &v4, const T5 &v5, const T6 &v6)
{this->AccessKey().Initialize(v1, v2, v3, v4, v5, v6);}
template <class T1, class T2, class T3, class T4, class T5, class T6, class T7>
PK_FinalTemplate(T1 &v1, const T2 &v2, const T3 &v3, const T4 &v4, const T5 &v5, const T6 &v6, const T7 &v7)
{this->AccessKey().Initialize(v1, v2, v3, v4, v5, v6, v7);}
template <class T1, class T2, class T3, class T4, class T5, class T6, class T7, class T8>
PK_FinalTemplate(T1 &v1, const T2 &v2, const T3 &v3, const T4 &v4, const T5 &v5, const T6 &v6, const T7 &v7, const T8 &v8)
{this->AccessKey().Initialize(v1, v2, v3, v4, v5, v6, v7, v8);}
#endif
};
//! Base class for public key encryption standard classes. These classes are used to select from variants of algorithms. Note that not all standards apply to all algorithms.
struct EncryptionStandard {};
//! Base class for public key signature standard classes. These classes are used to select from variants of algorithms. Note that not all standards apply to all algorithms.
struct SignatureStandard {};
template <class STANDARD, class KEYS, class ALG_INFO>
class TF_ES;
//! Trapdoor Function Based Encryption Scheme
template <class STANDARD, class KEYS, class ALG_INFO = TF_ES<STANDARD, KEYS, int> >
class TF_ES : public KEYS
{
typedef typename STANDARD::EncryptionMessageEncodingMethod MessageEncodingMethod;
public:
//! see EncryptionStandard for a list of standards
typedef STANDARD Standard;
typedef TF_CryptoSchemeOptions<ALG_INFO, KEYS, MessageEncodingMethod> SchemeOptions;
static std::string CRYPTOPP_API StaticAlgorithmName() {return std::string(KEYS::StaticAlgorithmName()) + "/" + MessageEncodingMethod::StaticAlgorithmName();}
//! implements PK_Decryptor interface
typedef PK_FinalTemplate<TF_DecryptorImpl<SchemeOptions> > Decryptor;
//! implements PK_Encryptor interface
typedef PK_FinalTemplate<TF_EncryptorImpl<SchemeOptions> > Encryptor;
};
template <class STANDARD, class H, class KEYS, class ALG_INFO> // VC60 workaround: doesn't work if KEYS is first parameter
class TF_SS;
//! Trapdoor Function Based Signature Scheme
template <class STANDARD, class H, class KEYS, class ALG_INFO = TF_SS<STANDARD, H, KEYS, int> > // VC60 workaround: doesn't work if KEYS is first parameter
class TF_SS : public KEYS
{
public:
//! see SignatureStandard for a list of standards
typedef STANDARD Standard;
typedef typename Standard::SignatureMessageEncodingMethod MessageEncodingMethod;
typedef TF_SignatureSchemeOptions<ALG_INFO, KEYS, MessageEncodingMethod, H> SchemeOptions;
static std::string CRYPTOPP_API StaticAlgorithmName() {return std::string(KEYS::StaticAlgorithmName()) + "/" + MessageEncodingMethod::StaticAlgorithmName() + "(" + H::StaticAlgorithmName() + ")";}
//! implements PK_Signer interface
typedef PK_FinalTemplate<TF_SignerImpl<SchemeOptions> > Signer;
//! implements PK_Verifier interface
typedef PK_FinalTemplate<TF_VerifierImpl<SchemeOptions> > Verifier;
};
template <class KEYS, class SA, class MEM, class H, class ALG_INFO>
class DL_SS;
//! Discrete Log Based Signature Scheme
template <class KEYS, class SA, class MEM, class H, class ALG_INFO = DL_SS<KEYS, SA, MEM, H, int> >
class DL_SS : public KEYS
{
typedef DL_SignatureSchemeOptions<ALG_INFO, KEYS, SA, MEM, H> SchemeOptions;
public:
static std::string StaticAlgorithmName() {return SA::StaticAlgorithmName() + std::string("/EMSA1(") + H::StaticAlgorithmName() + ")";}
//! implements PK_Signer interface
typedef PK_FinalTemplate<DL_SignerImpl<SchemeOptions> > Signer;
//! implements PK_Verifier interface
typedef PK_FinalTemplate<DL_VerifierImpl<SchemeOptions> > Verifier;
};
//! Discrete Log Based Encryption Scheme
template <class KEYS, class AA, class DA, class EA, class ALG_INFO>
class DL_ES : public KEYS
{
typedef DL_CryptoSchemeOptions<ALG_INFO, KEYS, AA, DA, EA> SchemeOptions;
public:
//! implements PK_Decryptor interface
typedef PK_FinalTemplate<DL_DecryptorImpl<SchemeOptions> > Decryptor;
//! implements PK_Encryptor interface
typedef PK_FinalTemplate<DL_EncryptorImpl<SchemeOptions> > Encryptor;
};
NAMESPACE_END
#endif
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