authenc.h
#ifndef CRYPTOPP_AUTHENC_H
#define CRYPTOPP_AUTHENC_H
#include "cryptlib.h"
#include "secblock.h"
NAMESPACE_BEGIN(CryptoPP)
//! .
class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE AuthenticatedSymmetricCipherBase : public AuthenticatedSymmetricCipher
{
public:
AuthenticatedSymmetricCipherBase() : m_state(State_Start) {}
bool IsRandomAccess() const {return false;}
bool IsSelfInverting() const {return true;}
void UncheckedSetKey(const byte *,unsigned int,const CryptoPP::NameValuePairs &) {assert(false);}
void SetKey(const byte *userKey, size_t keylength, const NameValuePairs &params);
void Restart() {if (m_state > State_KeySet) m_state = State_KeySet;}
void Resynchronize(const byte *iv, int length=-1);
void Update(const byte *input, size_t length);
void ProcessData(byte *outString, const byte *inString, size_t length);
void TruncatedFinal(byte *mac, size_t macSize);
protected:
void AuthenticateData(const byte *data, size_t len);
const SymmetricCipher & GetSymmetricCipher() const {return const_cast<AuthenticatedSymmetricCipherBase *>(this)->AccessSymmetricCipher();};
virtual SymmetricCipher & AccessSymmetricCipher() =0;
virtual bool AuthenticationIsOnPlaintext() const =0;
virtual unsigned int AuthenticationBlockSize() const =0;
virtual void SetKeyWithoutResync(const byte *userKey, size_t keylength, const NameValuePairs &params) =0;
virtual void Resync(const byte *iv, size_t len) =0;
virtual size_t AuthenticateBlocks(const byte *data, size_t len) =0;
virtual void AuthenticateLastHeaderBlock() =0;
virtual void AuthenticateLastConfidentialBlock() {}
virtual void AuthenticateLastFooterBlock(byte *mac, size_t macSize) =0;
enum State {State_Start, State_KeySet, State_IVSet, State_AuthUntransformed, State_AuthTransformed, State_AuthFooter};
State m_state;
unsigned int m_bufferedDataLength;
lword m_totalHeaderLength, m_totalMessageLength, m_totalFooterLength;
AlignedSecByteBlock m_buffer;
};
NAMESPACE_END
#endif
AuthenticatedSymmetricCipher
interface for for one direction (encryption or decryption) of a stream cipher or block cipher mode wi...
Definition: cryptlib.h:626
SecBlock< byte, AllocatorWithCleanup< byte, true > >
cryptlib.h
AuthenticatedSymmetricCipherBase::IsRandomAccess
bool IsRandomAccess() const
returns whether this cipher supports random access
Definition: authenc.h:15
AuthenticatedSymmetricCipherBase::Restart
void Restart()
discard the current state, and restart with a new message
Definition: authenc.h:20
SymmetricCipher
interface for one direction (encryption or decryption) of a stream cipher or cipher mode ...
Definition: cryptlib.h:610
AuthenticatedSymmetricCipherBase
Definition: authenc.h:10
AuthenticatedSymmetricCipherBase::IsSelfInverting
bool IsSelfInverting() const
returns whether this transformation is self-inverting (e.g. xor with a keystream) ...
Definition: authenc.h:16
NameValuePairs
interface for retrieving values given their names
Definition: cryptlib.h:224