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/*
** Name: codec.h
** Purpose: Header file for SQLite codecs
** Author: Ulrich Telle
** Created: 2006-12-06
** Copyright: (c) 2006-2018 Ulrich Telle
** License: LGPL-3.0+ WITH WxWindows-exception-3.1
*/
#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_UNKNOWN 0
#define CODEC_TYPE_AES128 1
#define CODEC_TYPE_AES256 2
#define CODEC_TYPE_CHACHA20 3
#define CODEC_TYPE_SQLCIPHER 4
#define CODEC_TYPE_MAX 4
#define CODEC_TYPE_DEFAULT CODEC_TYPE_CHACHA20
#ifndef CODEC_TYPE
#define CODEC_TYPE CODEC_TYPE_DEFAULT
#endif
#if CODEC_TYPE < 1 || CODEC_TYPE > CODEC_TYPE_MAX
#error "Invalid codec type selected"
#endif
#define MAXKEYLENGTH 32
#define KEYLENGTH_AES128 16
#define KEYLENGTH_AES256 32
#define CODEC_SHA_ITER 4001
typedef struct _Codec
{
int m_isEncrypted;
/* Read cipher */
int m_hasReadCipher;
int m_readCipherType;
void* m_readCipher;
/* Write cipher */
int m_hasWriteCipher;
int m_writeCipherType;
void* m_writeCipher;
wx_sqlite3* m_db; /* Pointer to DB */
Btree* m_bt; /* Pointer to B-tree used by DB */
unsigned char m_page[SQLITE_MAX_PAGE_SIZE+24];
int m_pageSize;
int m_reserved;
} Codec;
void wxwx_sqlite3_config_table(wx_sqlite3_context* context, int argc, wx_sqlite3_value** argv);
void wxwx_sqlite3_config_params(wx_sqlite3_context* context, int argc, wx_sqlite3_value** argv);
int wxwx_sqlite3_config(wx_sqlite3* db, const char* paramName, int newValue);
int wxwx_sqlite3_config_cipher(wx_sqlite3* db, const char* cipherName, const char* paramName, int newValue);
int GetCipherType(wx_sqlite3* db);
void* GetCipherParams(wx_sqlite3* db, int cypherType);
int CodecInit(Codec* codec);
void CodecTerm(Codec* codec);
int CodecCopy(Codec* codec, Codec* other);
void CodecGenerateReadKey(Codec* codec, char* userPassword, int passwordLength);
void CodecGenerateWriteKey(Codec* codec, char* userPassword, int passwordLength);
int CodecEncrypt(Codec* codec, int page, unsigned char* data, int len, int useWriteKey);
int CodecDecrypt(Codec* codec, int page, unsigned char* data, int len);
int CodecCopyCipher(Codec* codec, int read2write);
int CodecSetup(Codec* codec, int cipherType, char* userPassword, int passwordLength);
int CodecSetupWriteCipher(Codec* codec, int cipherType, char* userPassword, int passwordLength);
void CodecSetIsEncrypted(Codec* codec, int isEncrypted);
void CodecSetReadCipherType(Codec* codec, int cipherType);
void CodecSetWriteCipherType(Codec* codec, int cipherType);
void CodecSetHasReadCipher(Codec* codec, int hasReadCipher);
void CodecSetHasWriteCipher(Codec* codec, int hasWriteCipher);
void CodecSetDb(Codec* codec, wx_sqlite3* db);
void CodecSetBtree(Codec* codec, Btree* bt);
int CodecIsEncrypted(Codec* codec);
int CodecHasReadCipher(Codec* codec);
int CodecHasWriteCipher(Codec* codec);
Btree* CodecGetBtree(Codec* codec);
unsigned char* CodecGetPageBuffer(Codec* codec);
int CodecGetLegacyReadCipher(Codec* codec);
int CodecGetLegacyWriteCipher(Codec* codec);
int CodecGetPageSizeReadCipher(Codec* codec);
int CodecGetPageSizeWriteCipher(Codec* codec);
int CodecGetReservedReadCipher(Codec* codec);
int CodecGetReservedWriteCipher(Codec* codec);
int CodecReservedEqual(Codec* codec);
void CodecPadPassword(char* password, int pswdlen, unsigned char pswd[32]);
void CodecRC4(unsigned char* key, int keylen,
unsigned char* textin, int textlen,
unsigned char* textout);
void CodecGetMD5Binary(unsigned char* data, int length, unsigned char* digest);
void CodecGetSHABinary(unsigned char* data, int length, unsigned char* digest);
void CodecGenerateInitialVector(int seed, unsigned char iv[16]);
#endif
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