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92 lines
2.3 KiB
92 lines
2.3 KiB
/*
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This file is part of cpp-ethereum.
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cpp-ethereum is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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cpp-ethereum is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file AES.h
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* @author Alex Leverington <nessence@gmail.com>
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* @date 2014
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*
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* AES
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* todo: use openssl
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*/
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#pragma once
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#include <atomic>
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#include "Common.h"
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namespace dev
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{
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namespace crypto
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{
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namespace aes
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{
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struct Aes128Ctr;
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enum StreamType { Encrypt, Decrypt };
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/**
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* @brief Encrypted stream
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*/
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class Stream
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{
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public:
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// streamtype maybe irrelevant w/ctr
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Stream(StreamType _t, h128 _ckey);
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~Stream();
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virtual void update(bytesRef io_bytes);
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/// Move ciphertext to _bytes.
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virtual size_t streamOut(bytes& o_bytes);
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private:
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Stream(Stream const&) = delete;
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Stream& operator=(Stream const&) = delete;
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h128 m_cSecret;
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bytes m_text;
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Aes128Ctr* cryptor;
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};
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/**
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* @brief Encrypted stream with inband SHA3 mac at specific interval.
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*/
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class AuthenticatedStream: public Stream
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{
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public:
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AuthenticatedStream(StreamType _t, h128 _ckey, h128 _mackey, unsigned _interval): Stream(_t, _ckey), m_macSecret(_mackey) { m_macInterval = _interval; }
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AuthenticatedStream(StreamType _t, Secret const& _s, unsigned _interval): Stream(_t, h128(_s)), m_macSecret(FixedHash<16>((byte const*)_s.data()+16,h128::ConstructFromPointer)) { m_macInterval = _interval; }
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/// Adjust mac interval. Next mac will be xored with value.
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void adjustInterval(unsigned _interval) { m_macInterval = _interval; }
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private:
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AuthenticatedStream(AuthenticatedStream const&) = delete;
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AuthenticatedStream& operator=(AuthenticatedStream const&) = delete;
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std::atomic<unsigned> m_macInterval;
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h128 m_macSecret;
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};
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}
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}
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bytes aesDecrypt(bytesConstRef _cipher, std::string const& _password, unsigned _rounds = 2000, bytesConstRef _salt = bytesConstRef());
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}
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