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/*
This file is part of cpp-ethereum.
cpp-ethereum 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.
cpp-ethereum 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 cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file SHA3.h
* @author Gav Wood <i@gavwood.com>
* @date 2014
*
* The FixedHash fixed-size "hash" container type.
*/
#pragma once
#include <string>
#include "FixedHash.h"
namespace dev
{
// SHA-3 convenience routines.
/// Calculate SHA3-256 hash of the given input and load it into the given output.
/// @returns false if o_output.size() != 32.
bool keccak256(bytesConstRef _input, bytesRef o_output);
/// Calculate SHA3-256 hash of the given input, returning as a 256-bit hash.
inline h256 keccak256(bytesConstRef _input) { h256 ret; keccak256(_input, ret.ref()); return ret; }
/// Calculate SHA3-256 hash of the given input, returning as a 256-bit hash.
inline h256 keccak256(bytes const& _input) { return keccak256(bytesConstRef(&_input)); }
/// Calculate SHA3-256 hash of the given input (presented as a binary-filled string), returning as a 256-bit hash.
inline h256 keccak256(std::string const& _input) { return keccak256(bytesConstRef(_input)); }
/// Calculate SHA3-256 hash of the given input (presented as a FixedHash), returns a 256-bit hash.
template<unsigned N> inline h256 keccak256(FixedHash<N> const& _input) { return keccak256(_input.ref()); }
/// Calculate SHA3-256 hash of the given input, possibly interpreting it as nibbles, and return the hash as a string filled with binary data.
inline std::string keccak256(std::string const& _input, bool _isNibbles) { return asString((_isNibbles ? keccak256(fromHex(_input)) : keccak256(bytesConstRef(&_input))).asBytes()); }
/// Calculate SHA3-256 MAC
inline void keccak256mac(bytesConstRef _secret, bytesConstRef _plain, bytesRef _output) { keccak256(_secret.toBytes() + _plain.toBytes()).ref().populate(_output); }
h256 swarmHash(bytes const& _data)
{
bytes size(8);
for (size_t i = 0; i < 8; ++i)
size[i] = (_data.size() >> (8 * i)) & 0xff;
return keccak256(size + _data);
}
}
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