/*
* Copyright (C) 2018 Rafael Ostertag
*
* This file is part of YAPET.
*
* YAPET is free software: you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* YAPET is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* YAPET. If not, see .
*
* Additional permission under GNU GPL version 3 section 7
*
* If you modify this program, or any covered work, by linking or combining it
* with the OpenSSL project's OpenSSL library (or a modified version of that
* library), containing parts covered by the terms of the OpenSSL or SSLeay
* licenses, Rafael Ostertag grants you additional permission to convey the
* resulting work. Corresponding Source for a non-source form of such a
* combination shall include the source code for the parts of OpenSSL used as
* well as that of the covered work.
*/
#ifndef _AES256_HH
#define _AES256_HH 1
#include
#include
#include "crypto.hh"
#include "intl.h"
#include "key.hh"
#include "securearray.hh"
namespace yapet {
/**
* Encrypt/decrypt data using AES 256 algorithm.
*
* This class does not use the IV provided by the key. Instead it expects the IV
* prepended to encrypted data and returns encrypted data with IV prepended.
*/
class Aes256 : public Crypto {
private:
SecureArray randomIV() const;
SecureArray extractIVFromRecord(const SecureArray& record) const;
SecureArray extractCipherTextFromRecord(const SecureArray& record) const;
protected:
const EVP_CIPHER* getCipher() const { return EVP_aes_256_cbc(); }
EVP_CIPHER_CTX* initializeOrThrow(const SecureArray& ivec, MODE mode);
void checkIVSizeOrThrow(const SecureArray& ivec);
void validateCipherOrThrow(const SecureArray& ivec);
public:
//! Constructor
Aes256(const std::shared_ptr& key);
Aes256(const Aes256&);
Aes256& operator=(const Aes256& c);
Aes256(Aes256&& c);
Aes256& operator=(Aes256&& c);
~Aes256() {}
/**
* Encrypt the plain text.
*
* The encrypted data has the 16 byte IV prepended.
*/
virtual SecureArray encrypt(const SecureArray& plainText);
/**
* Decrypt the cipher text.
*
* The cipher text must have the 16 byte IV prepended.
*/
virtual SecureArray decrypt(const SecureArray& cipherText);
};
} // namespace yapet
#endif // _AES256_HH