mirror of
https://github.com/shadps4-emu/ext-cryptopp.git
synced 2024-11-23 18:09:48 +00:00
65 lines
2.8 KiB
C++
65 lines
2.8 KiB
C++
// authenc.h - written and placed in the public domain by Wei Dai
|
|
|
|
//! \file
|
|
//! \headerfile authenc.h
|
|
//! \brief Base classes for working with authenticated encryption modes of encryption
|
|
|
|
#ifndef CRYPTOPP_AUTHENC_H
|
|
#define CRYPTOPP_AUTHENC_H
|
|
|
|
#include "cryptlib.h"
|
|
#include "secblock.h"
|
|
|
|
NAMESPACE_BEGIN(CryptoPP)
|
|
|
|
//! \class AuthenticatedSymmetricCipherBase
|
|
//! \brief Base implementation for one direction (encryption or decryption) of a stream cipher or block cipher mode with authentication
|
|
class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE AuthenticatedSymmetricCipherBase : public AuthenticatedSymmetricCipher
|
|
{
|
|
public:
|
|
AuthenticatedSymmetricCipherBase() : m_state(State_Start), m_bufferedDataLength(0),
|
|
m_totalHeaderLength(0), m_totalMessageLength(0), m_totalFooterLength(0) {}
|
|
|
|
bool IsRandomAccess() const {return false;}
|
|
bool IsSelfInverting() const {return true;}
|
|
|
|
//! \brief Sets the key for this object without performing parameter validation
|
|
//! \param key a byte buffer used to key the cipher
|
|
//! \param length the length of the byte buffer
|
|
//! \param params additional parameters passed as NameValuePairs
|
|
//! \details key must be at least DEFAULT_KEYLENGTH in length.
|
|
void UncheckedSetKey(const byte * key, unsigned int length,const CryptoPP::NameValuePairs ¶ms)
|
|
{CRYPTOPP_UNUSED(key), CRYPTOPP_UNUSED(length), CRYPTOPP_UNUSED(params); assert(false);}
|
|
|
|
void SetKey(const byte *userKey, size_t keylength, const NameValuePairs ¶ms);
|
|
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 ¶ms) =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
|