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// --------------------------------------------------------------------------
//
// 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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