1#ifndef CRYPTOPP_AUTHENC_H
2#define CRYPTOPP_AUTHENC_H
3
4#include "cryptlib.h"
5#include "secblock.h"
6
7NAMESPACE_BEGIN(CryptoPP)
8
9//! .
10class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE AuthenticatedSymmetricCipherBase : public AuthenticatedSymmetricCipher
11{
12public:
13	AuthenticatedSymmetricCipherBase() : m_state(State_Start) {}
14
15	bool IsRandomAccess() const {return false;}
16	bool IsSelfInverting() const {return true;}
17	void UncheckedSetKey(const byte *,unsigned int,const CryptoPP::NameValuePairs &) {assert(false);}
18
19	void SetKey(const byte *userKey, size_t keylength, const NameValuePairs &params);
20	void Restart() {if (m_state > State_KeySet) m_state = State_KeySet;}
21	void Resynchronize(const byte *iv, int length=-1);
22	void Update(const byte *input, size_t length);
23	void ProcessData(byte *outString, const byte *inString, size_t length);
24	void TruncatedFinal(byte *mac, size_t macSize);
25
26protected:
27	void AuthenticateData(const byte *data, size_t len);
28	const SymmetricCipher & GetSymmetricCipher() const {return const_cast<AuthenticatedSymmetricCipherBase *>(this)->AccessSymmetricCipher();};
29
30	virtual SymmetricCipher & AccessSymmetricCipher() =0;
31	virtual bool AuthenticationIsOnPlaintext() const =0;
32	virtual unsigned int AuthenticationBlockSize() const =0;
33	virtual void SetKeyWithoutResync(const byte *userKey, size_t keylength, const NameValuePairs &params) =0;
34	virtual void Resync(const byte *iv, size_t len) =0;
35	virtual size_t AuthenticateBlocks(const byte *data, size_t len) =0;
36	virtual void AuthenticateLastHeaderBlock() =0;
37	virtual void AuthenticateLastConfidentialBlock() {}
38	virtual void AuthenticateLastFooterBlock(byte *mac, size_t macSize) =0;
39
40	enum State {State_Start, State_KeySet, State_IVSet, State_AuthUntransformed, State_AuthTransformed, State_AuthFooter};
41	State m_state;
42	unsigned int m_bufferedDataLength;
43	lword m_totalHeaderLength, m_totalMessageLength, m_totalFooterLength;
44	AlignedSecByteBlock m_buffer;
45};
46
47NAMESPACE_END
48
49#endif
50