seal.h
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// seal.h - originally written and placed in the public domain by Wei Dai
/// \file seal.h
/// \brief Classes for SEAL stream cipher
/// \since Crypto++ 2.2
#ifndef CRYPTOPP_SEAL_H
#define CRYPTOPP_SEAL_H
#include "strciphr.h"
#include "secblock.h"
NAMESPACE_BEGIN(CryptoPP)
/// \brief SEAL stream cipher information
/// \tparam B Endianness of the stream cipher
/// \since Crypto++ 2.2
template <class B = BigEndian>
struct SEAL_Info : public FixedKeyLength<20, SimpleKeyingInterface::INTERNALLY_GENERATED_IV, 4>
{
CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return B::ToEnum() == LITTLE_ENDIAN_ORDER ? "SEAL-3.0-LE" : "SEAL-3.0-BE";}
};
/// \brief SEAL stream cipher operation
/// \tparam B Endianness of the stream cipher
/// \since Crypto++ 2.2
template <class B = BigEndian>
class CRYPTOPP_NO_VTABLE SEAL_Policy : public AdditiveCipherConcretePolicy<word32, 256>, public SEAL_Info<B>
{
protected:
void CipherSetKey(const NameValuePairs &params, const byte *key, size_t length);
void OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount);
void CipherResynchronize(byte *keystreamBuffer, const byte *IV, size_t length);
bool CipherIsRandomAccess() const {return true;}
void SeekToIteration(lword iterationCount);
private:
FixedSizeSecBlock<word32, 512> m_T;
FixedSizeSecBlock<word32, 256> m_S;
SecBlock<word32> m_R;
word32 m_startCount, m_iterationsPerCount;
word32 m_outsideCounter, m_insideCounter;
};
/// \brief SEAL stream cipher
/// \tparam B Endianness of the stream cipher
/// \sa <a href="http://www.cryptopp.com/wiki/SEAL-3.0-BE">SEAL</a>
/// \since Crypto++ 2.2
template <class B = BigEndian>
struct SEAL : public SEAL_Info<B>, public SymmetricCipherDocumentation
{
typedef SymmetricCipherFinal<ConcretePolicyHolder<SEAL_Policy<B>, AdditiveCipherTemplate<> >, SEAL_Info<B> > Encryption;
typedef Encryption Decryption;
};
NAMESPACE_END
#endif
AdditiveCipherTemplate
Base class for additive stream ciphers with SymmetricCipher interface.
Definition strciphr.h:298
FixedKeyLength
Inherited by keyed algorithms with fixed key length.
Definition seckey.h:125
FixedSizeSecBlock
Fixed size stack-based SecBlock.
Definition secblock.h:1246
NameValuePairs
Interface for retrieving values given their names.
Definition cryptlib.h:327
SEAL_Policy
SEAL stream cipher operation.
Definition seal.h:29
SecBlock
Secure memory block with allocator and cleanup.
Definition secblock.h:731
SymmetricCipherFinal
SymmetricCipher implementation.
Definition strciphr.h:684
word32
unsigned int word32
32-bit unsigned datatype
Definition config_int.h:72
lword
word64 lword
Large word type.
Definition config_int.h:168
LITTLE_ENDIAN_ORDER
@ LITTLE_ENDIAN_ORDER
byte order is little-endian
Definition cryptlib.h:150
CryptoPP
Crypto++ library namespace.
secblock.h
Classes and functions for secure memory allocations.
strciphr.h
Classes for implementing stream ciphers.
KeystreamOperation
KeystreamOperation
Keystream operation flags.
Definition strciphr.h:88
AdditiveCipherAbstractPolicy::SeekToIteration
virtual void SeekToIteration(lword iterationCount)
Seeks to a random position in the stream.
Definition strciphr.h:174
AdditiveCipherAbstractPolicy::CipherSetKey
virtual void CipherSetKey(const NameValuePairs &params, const byte *key, size_t length)=0
Key the cipher.
AdditiveCipherAbstractPolicy::CipherIsRandomAccess
virtual bool CipherIsRandomAccess() const =0
Flag indicating random access.
AdditiveCipherAbstractPolicy::CipherResynchronize
virtual void CipherResynchronize(byte *keystreamBuffer, const byte *iv, size_t length)
Resynchronize the cipher.
Definition strciphr.h:163
AdditiveCipherConcretePolicy
Base class for additive stream ciphers.
Definition strciphr.h:202
AdditiveCipherConcretePolicy::OperateKeystream
virtual void OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount)=0
Operates the keystream.
SEAL_Info
SEAL stream cipher information.
Definition seal.h:20
SEAL
SEAL stream cipher.
Definition seal.h:52
SymmetricCipherDocumentation
Provides Encryption and Decryption typedefs used by derived classes to implement a symmetric cipher.
Definition seckey.h:414