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-rw-r--r--lib/wrap/sqlite/codec.h106
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diff --git a/lib/wrap/sqlite/codec.h b/lib/wrap/sqlite/codec.h
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-/*
- * Codec class for SQLite3 encryption codec.
- * (C) 2010 Olivier de Gaalon
- *
- * Distributed under the terms of the Botan license
- */
-
-#ifndef _CODEC_H_
-#define _CODEC_H_
-
-#include <string>
-#include <botan/botan.h>
-#include <botan/loadstor.h>
-
-using namespace std;
-using namespace Botan;
-
-/*These constants can be used to tweak the codec behavior as follows
- *Note that once you've encrypted a database with these settings,
- *recompiling with any different settings will give you a library that
- *cannot read that database, even given the same passphrase.*/
-
-//BLOCK_CIPHER_STR: Cipher and mode used for encrypting the database
-//make sure to add "/NoPadding" for modes that use padding schemes
-const string BLOCK_CIPHER_STR = "Twofish/XTS";
-
-//PBKDF_STR: Key derivation function used to derive both the encryption
-//and IV derivation keys from the given database passphrase
-const string PBKDF_STR = "PBKDF2(SHA-160)";
-
-//SALT_STR: Hard coded salt used to derive the key from the passphrase.
-const string SALT_STR = "&g#nB'9]";
-
-//SALT_SIZE: Size of the salt in bytes (as given in SALT_STR)
-const int SALT_SIZE = 64/8; //64 bit, 8 byte salt
-
-//MAC_STR: CMAC used to derive the IV that is used for db page
-//encryption
-const string MAC_STR = "CMAC(Twofish)";
-
-//PBKDF_ITERATIONS: Number of hash iterations used in the key derivation
-//process.
-const int PBKDF_ITERATIONS = 10000;
-
-//KEY_SIZE: Size of the encryption key. Note that XTS splits the key
-//between two ciphers, so if you're using XTS, double the intended key
-//size. (ie, "AES-128/XTS" should have a 256 bit KEY_SIZE)
-const int KEY_SIZE = 512/8; //512 bit, 64 byte key. (256 bit XTS key)
-
-//IV_DERIVATION_KEY_SIZE: Size of the key used with the CMAC (MAC_STR)
-//above.
-const int IV_DERIVATION_KEY_SIZE = 256/8; //256 bit, 32 byte key
-
-//This is definited in sqlite.h and very unlikely to change
-#define SQLITE_MAX_PAGE_SIZE 32768
-
-class Codec
-{
-public:
- Codec(void *db);
- Codec(const Codec* other, void *db);
-
- void GenerateWriteKey(const char *userPassword, int passwordLength);
- void DropWriteKey();
- void SetWriteIsRead();
- void SetReadIsWrite();
-
- unsigned char* Encrypt(int page, unsigned char *data, bool useWriteKey);
- void Decrypt(int page, unsigned char *data);
-
- void SetPageSize(int pageSize) { m_pageSize = pageSize; }
-
- bool HasReadKey() { return m_hasReadKey; }
- bool HasWriteKey() { return m_hasWriteKey; }
- void* GetDB() { return m_db; }
- const char* GetAndResetError();
-
-private:
- bool m_hasReadKey;
- bool m_hasWriteKey;
-
- SymmetricKey
- m_readKey,
- m_writeKey,
- m_ivReadKey,
- m_ivWriteKey;
-
- Pipe
- m_encipherPipe,
- m_decipherPipe,
- m_macPipe;
-
- Keyed_Filter *m_encipherFilter;
- Keyed_Filter *m_decipherFilter;
- MAC_Filter *m_cmac;
-
- int m_pageSize;
- unsigned char m_page[SQLITE_MAX_PAGE_SIZE];
- void *m_db;
- const char *m_botanErrorMsg;
-
- InitializationVector GetIVForPage(u32bit page, bool useWriteKey);
- void InitializeCodec(void *db);
-};
-
-#endif