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https://github.com/shadps4-emu/ext-cryptopp.git
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58 lines
2.3 KiB
C++
58 lines
2.3 KiB
C++
// authenc.h - written and placed in the public domain by Wei Dai
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//! \file
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//! \headerfile authenc.h
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//! \brief Base classes for working with authenticated encryption modes of encryption
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#ifndef CRYPTOPP_AUTHENC_H
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#define CRYPTOPP_AUTHENC_H
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#include "cryptlib.h"
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#include "secblock.h"
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NAMESPACE_BEGIN(CryptoPP)
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//! \class AuthenticatedSymmetricCipherBase
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//! \brief
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class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE AuthenticatedSymmetricCipherBase : public AuthenticatedSymmetricCipher
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{
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public:
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AuthenticatedSymmetricCipherBase() : m_state(State_Start), m_bufferedDataLength(0),
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m_totalHeaderLength(0), m_totalMessageLength(0), m_totalFooterLength(0) {}
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bool IsRandomAccess() const {return false;}
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bool IsSelfInverting() const {return true;}
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void UncheckedSetKey(const byte *,unsigned int,const CryptoPP::NameValuePairs &) {assert(false);}
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void SetKey(const byte *userKey, size_t keylength, const NameValuePairs ¶ms);
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void Restart() {if (m_state > State_KeySet) m_state = State_KeySet;}
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void Resynchronize(const byte *iv, int length=-1);
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void Update(const byte *input, size_t length);
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void ProcessData(byte *outString, const byte *inString, size_t length);
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void TruncatedFinal(byte *mac, size_t macSize);
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protected:
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void AuthenticateData(const byte *data, size_t len);
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const SymmetricCipher & GetSymmetricCipher() const {return const_cast<AuthenticatedSymmetricCipherBase *>(this)->AccessSymmetricCipher();};
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virtual SymmetricCipher & AccessSymmetricCipher() =0;
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virtual bool AuthenticationIsOnPlaintext() const =0;
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virtual unsigned int AuthenticationBlockSize() const =0;
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virtual void SetKeyWithoutResync(const byte *userKey, size_t keylength, const NameValuePairs ¶ms) =0;
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virtual void Resync(const byte *iv, size_t len) =0;
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virtual size_t AuthenticateBlocks(const byte *data, size_t len) =0;
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virtual void AuthenticateLastHeaderBlock() =0;
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virtual void AuthenticateLastConfidentialBlock() {}
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virtual void AuthenticateLastFooterBlock(byte *mac, size_t macSize) =0;
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enum State {State_Start, State_KeySet, State_IVSet, State_AuthUntransformed, State_AuthTransformed, State_AuthFooter};
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State m_state;
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unsigned int m_bufferedDataLength;
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lword m_totalHeaderLength, m_totalMessageLength, m_totalFooterLength;
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AlignedSecByteBlock m_buffer;
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};
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NAMESPACE_END
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#endif
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