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77 lines
2.4 KiB
77 lines
2.4 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 EC.cpp
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* @author Alex Leverington <nessence@gmail.com>
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* @date 2014
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*
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* Shared EC classes and functions.
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*/
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#pragma warning(push)
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#pragma warning(disable:4100 4244)
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wconversion"
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#pragma GCC diagnostic ignored "-Wunused-parameter"
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#pragma GCC diagnostic ignored "-Wunused-variable"
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#pragma GCC diagnostic ignored "-Wdelete-non-virtual-dtor"
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#pragma GCC diagnostic ignored "-Wextra"
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#include <files.h>
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#pragma warning(pop)
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#pragma GCC diagnostic pop
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#include "CryptoPP.h"
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#include "SHA3.h"
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#include "EC.h"
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// CryptoPP and dev conflict so dev and pp namespace are used explicitly
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using namespace std;
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using namespace dev;
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using namespace dev::crypto;
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using namespace CryptoPP;
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void dev::crypto::encrypt(Public const& _key, bytes& io_cipher)
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{
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ECIES<ECP>::Encryptor e;
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e.AccessKey().AccessGroupParameters().Initialize(pp::secp256k1());
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e.AccessKey().SetPublicElement(pp::PointFromPublic(_key));
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size_t plen = io_cipher.size();
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bytes c;
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c.resize(e.CiphertextLength(plen));
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// todo: use StringSource with _plain as input and output.
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e.Encrypt(pp::PRNG(), io_cipher.data(), plen, c.data());
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memset(io_cipher.data(), 0, io_cipher.size());
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io_cipher = std::move(c);
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}
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void dev::crypto::decrypt(Secret const& _k, bytes& io_text)
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{
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CryptoPP::ECIES<CryptoPP::ECP>::Decryptor d;
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d.AccessKey().AccessGroupParameters().Initialize(pp::secp256k1());
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d.AccessKey().SetPrivateExponent(pp::ExponentFromSecret(_k));
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size_t clen = io_text.size();
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bytes p;
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p.resize(d.MaxPlaintextLength(io_text.size()));
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// todo: use StringSource with _c as input and output.
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DecodingResult r = d.Decrypt(pp::PRNG(), io_text.data(), clen, p.data());
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if (!r.isValidCoding)
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{
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io_text.clear();
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return;
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}
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io_text.resize(r.messageLength);
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io_text = std::move(p);
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}
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