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/*
///////////////////////////////////////////////////////////////////////////////
// Name: codec.h
// Purpose:
// Author: Ulrich Telle
// Modified by:
// Created: 2006-12-06
// Copyright: (c) Ulrich Telle
// Licence: wxWindows licence
///////////////////////////////////////////////////////////////////////////////
/// \file codec.h Interface of the codec class
*/
#ifndef _CODEC_H_
#define _CODEC_H_
#ifdef __cplusplus
extern "C" {
#endif
#if defined(__BORLANDC__)
#define __STDC__ 1
#endif
#if defined(__BORLANDC__)
#undef __STDC__
#endif
/*
// ATTENTION: Macro similar to that in pager.c
// TODO: Check in case of new version of SQLite
*/
#define WX_PAGER_MJ_PGNO(x) ((PENDING_BYTE/(x))+1)
#ifdef __cplusplus
} /* End of the 'extern "C"' block */
#endif
#include "rijndael.h"
#define CODEC_TYPE_AES128 1
#define CODEC_TYPE_AES256 2
#ifndef CODEC_TYPE
#define CODEC_TYPE CODEC_TYPE_AES128
#endif
#if CODEC_TYPE == CODEC_TYPE_AES256
#define KEYLENGTH 32
#define CODEC_SHA_ITER 4001
#else
#define KEYLENGTH 16
#endif
typedef struct _Codec
{
int m_isEncrypted;
int m_hasReadKey;
unsigned char m_readKey[KEYLENGTH];
int m_hasWriteKey;
unsigned char m_writeKey[KEYLENGTH];
Rijndael* m_aes;
Btree* m_bt; /* Pointer to B-tree used by DB */
unsigned char m_page[SQLITE_MAX_PAGE_SIZE+24];
} Codec;
void CodecInit(Codec* codec);
void CodecTerm(Codec* codec);
void CodecCopy(Codec* codec, Codec* other);
void CodecGenerateReadKey(Codec* codec, char* userPassword, int passwordLength);
void CodecGenerateWriteKey(Codec* codec, char* userPassword, int passwordLength);
void CodecEncrypt(Codec* codec, int page, unsigned char* data, int len, int useWriteKey);
void CodecDecrypt(Codec* codec, int page, unsigned char* data, int len);
void CodecCopyKey(Codec* codec, int read2write);
void CodecSetIsEncrypted(Codec* codec, int isEncrypted);
void CodecSetHasReadKey(Codec* codec, int hasReadKey);
void CodecSetHasWriteKey(Codec* codec, int hasWriteKey);
void CodecSetBtree(Codec* codec, Btree* bt);
int CodecIsEncrypted(Codec* codec);
int CodecHasReadKey(Codec* codec);
int CodecHasWriteKey(Codec* codec);
Btree* CodecGetBtree(Codec* codec);
unsigned char* CodecGetPageBuffer(Codec* codec);
void CodecGenerateEncryptionKey(Codec* codec, char* userPassword, int passwordLength,
unsigned char encryptionKey[KEYLENGTH]);
void CodecPadPassword(Codec* codec, char* password, int pswdlen, unsigned char pswd[32]);
void CodecRC4(Codec* codec, unsigned char* key, int keylen,
unsigned char* textin, int textlen,
unsigned char* textout);
void CodecGetMD5Binary(Codec* codec, unsigned char* data, int length, unsigned char* digest);
#if CODEC_TYPE == CODEC_TYPE_AES256
void CodecGetSHABinary(Codec* codec, unsigned char* data, int length, unsigned char* digest);
#endif
void CodecGenerateInitialVector(Codec* codec, int seed, unsigned char iv[16]);
void CodecAES(Codec* codec, int page, int encrypt, unsigned char encryptionKey[KEYLENGTH],
unsigned char* datain, int datalen, unsigned char* dataout);
#endif
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