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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 CryptoPP.h
* @author Alex Leverington <nessence@gmail.com>
* @date 2014
*
* CryptoPP headers and primitive helper methods
*/
#pragma once
#include <mutex>
// need to leave this one disabled for link-time. blame cryptopp.
#pragma GCC diagnostic ignored "-Wunused-function"
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#pragma warning(push)
#pragma warning(disable:4100 4244)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wconversion"
#pragma GCC diagnostic ignored "-Wunused-parameter"
#pragma GCC diagnostic ignored "-Wunused-variable"
#pragma GCC diagnostic ignored "-Wdelete-non-virtual-dtor"
#pragma GCC diagnostic ignored "-Wextra"
#include <cryptopp/sha.h>
#include <cryptopp/sha3.h>
#include <cryptopp/ripemd.h>
#include <cryptopp/aes.h>
#include <cryptopp/pwdbased.h>
#include <cryptopp/modes.h>
#include <cryptopp/filters.h>
#include <cryptopp/eccrypto.h>
#include <cryptopp/ecp.h>
#include <cryptopp/files.h>
#include <cryptopp/osrng.h>
#include <cryptopp/oids.h>
#include <cryptopp/dsa.h>
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#pragma warning(pop)
#pragma GCC diagnostic pop
#include "SHA3.h"
#include "Common.h"
namespace dev
{
namespace crypto
{
using namespace CryptoPP;
inline ECP::Point publicToPoint(Public const& _p) { Integer x(_p.data(), 32); Integer y(_p.data() + 32, 32); return std::move(ECP::Point(x,y)); }
inline Integer secretToExponent(Secret const& _s) { return std::move(Integer(_s.data(), Secret::size)); }
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/**
* CryptoPP secp256k1 algorithms.
* @todo Collect ECIES methods into class.
*/
class Secp256k1
{
public:
Secp256k1(): m_oid(ASN1::secp256k1()), m_params(m_oid), m_curve(m_params.GetCurve()), m_q(m_params.GetGroupOrder()), m_qs(m_params.GetSubgroupOrder()) {}
Address toAddress(Public const& _p) { return right160(sha3(_p.ref())); }
void toPublic(Secret const& _s, Public& o_public) { exponentToPublic(Integer(_s.data(), sizeof(_s)), o_public); }
/// Encrypts text (replace input). (ECIES w/XOR-SHA1)
void encrypt(Public const& _k, bytes& io_cipher);
/// Decrypts text (replace input). (ECIES w/XOR-SHA1)
void decrypt(Secret const& _k, bytes& io_text);
/// Encrypts text (replace input). (ECIES w/AES128-CTR-SHA256)
void encryptECIES(Public const& _k, bytes& io_cipher);
/// Decrypts text (replace input). (ECIES w/AES128-CTR-SHA256)
bool decryptECIES(Secret const& _k, bytes& io_text);
/// Key derivation function used by encryptECIES and decryptECIES.
bytes eciesKDF(Secret _z, bytes _s1, unsigned kdBitLen = 256);
/// @returns siganture of message.
Signature sign(Secret const& _k, bytesConstRef _message);
/// @returns compact siganture of provided hash.
Signature sign(Secret const& _k, h256 const& _hash);
/// Verify compact signature (public key is extracted from signature).
bool verify(Signature const& _signature, bytesConstRef _message);
/// Verify signature.
bool verify(Public const& _p, Signature const& _sig, bytesConstRef _message, bool _hashed = false);
/// Recovers public key from compact signature. Uses libsecp256k1.
Public recover(Signature _signature, bytesConstRef _message);
/// Verifies _s is a valid secret key and returns corresponding public key in o_p.
bool verifySecret(Secret const& _s, Public& o_p);
void agree(Secret const& _s, Public const& _r, h256& o_s);
protected:
void exportPrivateKey(DL_PrivateKey_EC<ECP> const& _k, Secret& o_s) { _k.GetPrivateExponent().Encode(o_s.data(), Secret::size); }
void exportPublicKey(DL_PublicKey_EC<ECP> const& _k, Public& o_p);
void exponentToPublic(Integer const& _e, Public& o_p);
template <class T> void initializeDLScheme(Secret const& _s, T& io_operator) { std::lock_guard<std::mutex> l(x_params); io_operator.AccessKey().Initialize(m_params, secretToExponent(_s)); }
template <class T> void initializeDLScheme(Public const& _p, T& io_operator) { std::lock_guard<std::mutex> l(x_params); io_operator.AccessKey().Initialize(m_params, publicToPoint(_p)); }
private:
OID m_oid;
std::mutex x_rng;
AutoSeededRandomPool m_rng;
std::mutex x_params;
DL_GroupParameters_EC<ECP> m_params;
std::mutex x_curve;
DL_GroupParameters_EC<ECP>::EllipticCurve m_curve;
Integer m_q;
Integer m_qs;
};
}
}