Click here to Skip to main content
15,896,359 members
Articles / Web Development / ASP.NET

Encryption and compression, native and managed

Rate me:
Please Sign up or sign in to vote.
4.74/5 (17 votes)
29 Jun 2012CPOL7 min read 111.2K   6.9K   92  
DLL for native encryption and compression (using Crypto++). Includes RSA Key Generator in C#, and encryption and compression in ASP.NET (C#).
#ifndef CRYPTOPP_EAX_H
#define CRYPTOPP_EAX_H

#include "authenc.h"
#include "modes.h"
#include "cmac.h"

NAMESPACE_BEGIN(CryptoPP)

//! .
class CRYPTOPP_NO_VTABLE EAX_Base : public AuthenticatedSymmetricCipherBase
{
public:
	// AuthenticatedSymmetricCipher
	std::string AlgorithmName() const
		{return GetMAC().GetCipher().AlgorithmName() + std::string("/EAX");}
	size_t MinKeyLength() const
		{return GetMAC().MinKeyLength();}
	size_t MaxKeyLength() const
		{return GetMAC().MaxKeyLength();}
	size_t DefaultKeyLength() const
		{return GetMAC().DefaultKeyLength();}
	size_t GetValidKeyLength(size_t n) const
		{return GetMAC().GetValidKeyLength(n);}
	bool IsValidKeyLength(size_t n) const
		{return GetMAC().IsValidKeyLength(n);}
	unsigned int OptimalDataAlignment() const
		{return GetMAC().OptimalDataAlignment();}
	IV_Requirement IVRequirement() const
		{return UNIQUE_IV;}
	unsigned int IVSize() const
		{return GetMAC().TagSize();}
	unsigned int MinIVLength() const
		{return 0;}
	unsigned int MaxIVLength() const
		{return UINT_MAX;}
	unsigned int DigestSize() const
		{return GetMAC().TagSize();}
	lword MaxHeaderLength() const
		{return LWORD_MAX;}
	lword MaxMessageLength() const
		{return LWORD_MAX;}

protected:
	// AuthenticatedSymmetricCipherBase
	bool AuthenticationIsOnPlaintext() const
		{return false;}
	unsigned int AuthenticationBlockSize() const
		{return 1;}
	void SetKeyWithoutResync(const byte *userKey, size_t keylength, const NameValuePairs &params);
	void Resync(const byte *iv, size_t len);
	size_t AuthenticateBlocks(const byte *data, size_t len);
	void AuthenticateLastHeaderBlock();
	void AuthenticateLastFooterBlock(byte *mac, size_t macSize);
	SymmetricCipher & AccessSymmetricCipher() {return m_ctr;}
	const CMAC_Base & GetMAC() const {return const_cast<EAX_Base *>(this)->AccessMAC();}
	virtual CMAC_Base & AccessMAC() =0;

	CTR_Mode_ExternalCipher::Encryption m_ctr;
};

//! .
template <class T_BlockCipher, bool T_IsEncryption>
class EAX_Final : public EAX_Base
{
public:
	static std::string StaticAlgorithmName()
		{return T_BlockCipher::StaticAlgorithmName() + std::string("/EAX");}
	bool IsForwardTransformation() const
		{return T_IsEncryption;}

private:
	CMAC_Base & AccessMAC() {return m_cmac;}
	CMAC<T_BlockCipher> m_cmac;
};

#ifdef EAX	// EAX is defined to 11 on GCC 3.4.3, OpenSolaris 8.11
#undef EAX
#endif

/// <a href="http://www.cryptolounge.org/wiki/EAX">EAX</a>
template <class T_BlockCipher>
struct EAX : public AuthenticatedSymmetricCipherDocumentation
{
	typedef EAX_Final<T_BlockCipher, true> Encryption;
	typedef EAX_Final<T_BlockCipher, false> Decryption;
};

NAMESPACE_END

#endif

By viewing downloads associated with this article you agree to the Terms of Service and the article's licence.

If a file you wish to view isn't highlighted, and is a text file (not binary), please let us know and we'll add colourisation support for it.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


Written By
Software Developer
Argentina Argentina
System developer from Argentina.

Programmed in VB 5,6,.NET, C#, Java, PL-SQL, Transac-SQL, C, C++ and even some "calculator" language.

Love to build small, useful applications.
Usually building big and complicated apps based on solid, reliable components.

Hobbies: reading, photography, chess, paddle, running.

Comments and Discussions