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// distribution boxbackup-0.10 (svn version: 494)
//
// Copyright (c) 2003 - 2006
// Ben Summers and contributors. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// 3. All use of this software and associated advertising materials must
// display the following acknowledgment:
// This product includes software developed by Ben Summers.
// 4. The names of the Authors may not be used to endorse or promote
// products derived from this software without specific prior written
// permission.
//
// [Where legally impermissible the Authors do not disclaim liability for
// direct physical injury or death caused solely by defects in the software
// unless it is modified by a third party.]
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT,
// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
//
//
// --------------------------------------------------------------------------
//
// File
// Name: CipherContext.h
// Purpose: Context for symmetric encryption / descryption
// Created: 1/12/03
//
// --------------------------------------------------------------------------
#ifndef CIPHERCONTEXT__H
#define CIPHERCONTEXT__H
#ifdef BOX_LIB_CRYPTO_OPENSSL_HEADERS_INCLUDED_FALSE
always include CipherContext.h first in any .cpp file
#endif
#define BOX_LIB_CRYPTO_OPENSSL_HEADERS_INCLUDED_TRUE
#include <openssl/evp.h>
class CipherDescription;
#define CIPHERCONTEXT_MAX_GENERATED_IV_LENGTH 32
// --------------------------------------------------------------------------
//
// Class
// Name: CipherContext
// Purpose: Context for symmetric encryption / descryption
// Created: 1/12/03
//
// --------------------------------------------------------------------------
class CipherContext
{
public:
CipherContext();
~CipherContext();
private:
CipherContext(const CipherContext &); // no copying
CipherContext &operator=(const CipherContext &); // no assignment
public:
typedef enum
{
Decrypt = 0,
Encrypt = 1
} CipherFunction;
void Init(CipherContext::CipherFunction Function, const CipherDescription &rDescription);
void Reset();
void Begin();
int Transform(void *pOutBuffer, int OutLength, const void *pInBuffer, int InLength);
int Final(void *pOutBuffer, int OutLength);
int InSizeForOutBufferSize(int OutLength);
int MaxOutSizeForInBufferSize(int InLength);
int TransformBlock(void *pOutBuffer, int OutLength, const void *pInBuffer, int InLength);
bool IsInitialised() {return mInitialised;}
int GetIVLength();
void SetIV(const void *pIV);
const void *SetRandomIV(int &rLengthOut);
void UsePadding(bool Padding = true);
#ifdef HAVE_OLD_SSL
void OldOpenSSLFinal(unsigned char *Buffer, int &rOutLengthOut);
#endif
private:
EVP_CIPHER_CTX ctx;
bool mInitialised;
bool mWithinTransform;
bool mPaddingOn;
uint8_t mGeneratedIV[CIPHERCONTEXT_MAX_GENERATED_IV_LENGTH];
#ifdef HAVE_OLD_SSL
CipherFunction mFunction;
CipherDescription *mpDescription;
#endif
};
#endif // CIPHERCONTEXT__H
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