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codec.cpp    206 lines (186 with data), 5.6 kB

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/*
* Codec class for SQLite3 encryption codec.
* (C) 2010 Olivier de Gaalon
*
* Distributed under the terms of the Botan license
*/
#include "codec.h"
#include "botan_all.h"
Codec::Codec(void *db)
{
InitializeCodec(db);
}
Codec::Codec(const Codec *other, void *db)
{
//Only used to copy main db key for an attached db
InitializeCodec(db);
m_hasReadKey = other->m_hasReadKey;
m_hasWriteKey = other->m_hasWriteKey;
m_readKey = other->m_readKey;
m_ivReadKey = other->m_ivReadKey;
m_writeKey = other->m_writeKey;
m_ivWriteKey = other->m_ivWriteKey;
}
void Codec::InitializeCodec(void *db)
{
m_hasReadKey = false;
m_hasWriteKey = false;
m_db = db;
m_botanErrorMsg = 0;
try
{
m_encipherFilter = get_cipher(BLOCK_CIPHER_STR, ENCRYPTION);
m_decipherFilter = get_cipher(BLOCK_CIPHER_STR, DECRYPTION);
m_cmac = new MAC_Filter(MAC_STR);
m_encipherPipe.append(m_encipherFilter);
m_decipherPipe.append(m_decipherFilter);
m_macPipe.append(m_cmac);
}
catch(Botan::Exception e)
{
m_botanErrorMsg = e.what();
}
}
void Codec::GenerateWriteKey(const char *userPassword, int passwordLength)
{
try
{
#if BOTAN_VERSION_CODE >= BOTAN_VERSION_CODE_FOR(1,9,4)
PBKDF *pbkdf = get_pbkdf(PBKDF_STR);
SymmetricKey masterKey =
pbkdf->derive_key(KEY_SIZE + IV_DERIVATION_KEY_SIZE, std::string(userPassword, passwordLength),
(const byte*)SALT_STR.c_str(), SALT_SIZE, PBKDF_ITERATIONS);
#elif BOTAN_VERSION_CODE >= BOTAN_VERSION_CODE_FOR(1,8,0)
S2K* s2k = get_s2k(PBKDF_STR);
s2k->set_iterations(PBKDF_ITERATIONS);
s2k->change_salt((const byte*)SALT_STR.c_str(), SALT_SIZE);
SymmetricKey masterKey =
s2k->derive_key(KEY_SIZE + IV_DERIVATION_KEY_SIZE, std::string(userPassword, passwordLength));
#else
#error "This code requires botan 1.8 or newer"
#endif
m_writeKey = SymmetricKey(masterKey.bits_of(), KEY_SIZE);
m_ivWriteKey = SymmetricKey(masterKey.bits_of() + KEY_SIZE, IV_DERIVATION_KEY_SIZE);
m_hasWriteKey = true;
}
catch(Botan::Exception e)
{
m_botanErrorMsg = e.what();
}
}
void Codec::DropWriteKey()
{
m_hasWriteKey = false;
}
void Codec::SetReadIsWrite()
{
m_readKey = m_writeKey;
m_ivReadKey = m_ivWriteKey;
m_hasReadKey = m_hasWriteKey;
}
void Codec::SetWriteIsRead()
{
m_writeKey = m_readKey;
m_ivWriteKey = m_ivReadKey;
m_hasWriteKey = m_hasReadKey;
}
unsigned char* Codec::Encrypt(int page, unsigned char *data, bool useWriteKey)
{
memcpy(m_page, data, m_pageSize);
try
{
m_encipherFilter->set_key(useWriteKey ? m_writeKey : m_readKey);
m_encipherFilter->set_iv(GetIVForPage(page, useWriteKey));
m_encipherPipe.process_msg(m_page, m_pageSize);
m_encipherPipe.read(m_page, m_encipherPipe.remaining(Pipe::LAST_MESSAGE), Pipe::LAST_MESSAGE);
}
catch(Botan::Exception e)
{
m_botanErrorMsg = e.what();
}
return m_page; //return location of newly ciphered data
}
void Codec::Decrypt(int page, unsigned char *data)
{
try
{
m_decipherFilter->set_key(m_readKey);
m_decipherFilter->set_iv(GetIVForPage(page, false));
m_decipherPipe.process_msg(data, m_pageSize);
m_decipherPipe.read(data, m_decipherPipe.remaining(Pipe::LAST_MESSAGE), Pipe::LAST_MESSAGE);
}
catch(Botan::Exception e)
{
m_botanErrorMsg = e.what();
}
}
InitializationVector Codec::GetIVForPage(u32bit page, bool useWriteKey)
{
try
{
static unsigned char *intiv[4];
store_le(page, (byte*)intiv);
m_cmac->set_key(useWriteKey ? m_ivWriteKey : m_ivReadKey);
m_macPipe.process_msg((byte*)intiv, 4);
return m_macPipe.read_all(Pipe::LAST_MESSAGE);
}
catch(Botan::Exception e)
{
m_botanErrorMsg = e.what();
}
return NULL;
}
const char* Codec::GetAndResetError()
{
const char *message = m_botanErrorMsg;
m_botanErrorMsg = 0;
return message;
}
#include "codec_c_interface.h"
void InitializeBotan() {
LibraryInitializer::initialize();
}
void* InitializeNewCodec(void *db) {
return new Codec(db);
}
void* InitializeFromOtherCodec(const void *otherCodec, void *db) {
return new Codec((Codec*)otherCodec, db);
}
void GenerateWriteKey(void *codec, const char *userPassword, int passwordLength) {
((Codec*)codec)->GenerateWriteKey(userPassword, passwordLength);
}
void DropWriteKey(void *codec) {
((Codec*)codec)->DropWriteKey();
}
void SetWriteIsRead(void *codec) {
((Codec*)codec)->SetWriteIsRead();
}
void SetReadIsWrite(void *codec) {
((Codec*)codec)->SetReadIsWrite();
}
unsigned char* Encrypt(void *codec, int page, unsigned char *data, Bool useWriteKey) {
return ((Codec*)codec)->Encrypt(page, data, useWriteKey ? true : false);
}
void Decrypt(void *codec, int page, unsigned char *data) {
((Codec*)codec)->Decrypt(page, data);
}
void SetPageSize(void *codec, int pageSize) {
((Codec*)codec)->SetPageSize(pageSize);
}
Bool HasReadKey(void *codec) {
return ((Codec*)codec)->HasReadKey();
}
Bool HasWriteKey(void *codec) {
return ((Codec*)codec)->HasWriteKey();
}
void* GetDB(void *codec) {
return ((Codec*)codec)->GetDB();
}
const char* GetAndResetError(void *codec)
{
return ((Codec*)codec)->GetAndResetError();
}
void DeleteCodec(void *codec) {
Codec *deleteThisCodec = (Codec*)codec;
delete deleteThisCodec;
}