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// Copyright (c) 2012-2014 Konstantin Isakov <ikm@zbackup.org> and ZBackup contributors, see CONTRIBUTORS
// Part of ZBackup. Licensed under GNU GPLv2 or later + OpenSSL, see LICENSE
#ifndef ENCRYPTION_KEY_HH_INCLUDED
#define ENCRYPTION_KEY_HH_INCLUDED
#include <exception>
#include <string>
#include "ex.hh"
#include "zbackup.pb.h"
using std::string;
class EncryptionKey
{
bool isSet;
unsigned const static KeySize = 16; // TODO: make this configurable
char key[ KeySize ];
public:
DEF_EX( exInvalidPassword, "Invalid password specified", std::exception )
/// Decodes the encryption key from the given info and password. If info is
/// passed as NULL, the password is ignored and no key is set
EncryptionKey( string const & password, EncryptionKeyInfo const * );
~EncryptionKey();
/// Returns true if key was set, false otherwise.
bool hasKey() const
{ return isSet; }
/// Returns the key. Check if there is one with hasKey() first. Note: the key
/// should not be copied, as it may be allocated in a locked page in the
/// future
void const * getKey() const
{ return key; }
/// Returns key size, in bytes
unsigned getKeySize() const
{ return sizeof( key ); }
/// Generates new key info using the given password
static void generate( string const & password, EncryptionKeyInfo &,
EncryptionKey & encryptionkey );
/// Returns a static instance without any key set
static EncryptionKey const & noKey();
};
#endif
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