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74 lines
2.5 KiB
74 lines
2.5 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 CryptoPP.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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#include "CryptoPP.h"
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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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ECP::Point pp::PointFromPublic(Public const& _p)
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{
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ECP::Point p;
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CryptoPP::DL_PublicKey_EC<CryptoPP::ECP> pub;
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pub.AccessGroupParameters().Initialize(pp::secp256k1());
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bytes prefixedKey(pub.GetGroupParameters().GetEncodedElementSize(true));
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prefixedKey[0] = 0x04;
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assert(Public::size == prefixedKey.size() - 1);
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memcpy(&prefixedKey[1], _p.data(), prefixedKey.size() - 1);
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pub.GetGroupParameters().GetCurve().DecodePoint(p, prefixedKey.data(), prefixedKey.size());
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return std::move(p);
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}
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Integer pp::ExponentFromSecret(Secret const& _s)
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{
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static_assert(Secret::size == 32, "Secret key must be 32 bytes.");
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return std::move(Integer(_s.data(), Secret::size));
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}
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void pp::PublicFromExponent(Integer const& _e, Public& _p)
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{
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CryptoPP::DL_PrivateKey_EC<CryptoPP::ECP> k;
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k.AccessGroupParameters().Initialize(secp256k1());
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k.SetPrivateExponent(_e);
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CryptoPP::DL_PublicKey_EC<CryptoPP::ECP> p;
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p.AccessGroupParameters().Initialize(secp256k1());
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k.MakePublicKey(p);
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pp::PublicFromDL_PublicKey_EC(p, _p);
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}
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void pp::PublicFromDL_PublicKey_EC(CryptoPP::DL_PublicKey_EC<CryptoPP::ECP> const& _k, Public& _p)
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{
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bytes prefixedKey(_k.GetGroupParameters().GetEncodedElementSize(true));
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_k.GetGroupParameters().GetCurve().EncodePoint(prefixedKey.data(), _k.GetPublicElement(), false);
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static_assert(Public::size == 64, "Public key must be 64 bytes.");
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assert(Public::size + 1 == _k.GetGroupParameters().GetEncodedElementSize(true));
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memcpy(_p.data(), &prefixedKey[1], Public::size);
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}
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void pp::SecretFromDL_PrivateKey_EC(CryptoPP::DL_PrivateKey_EC<CryptoPP::ECP> const& _k, Secret& _s)
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{
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_k.GetPrivateExponent().Encode(_s.data(), Secret::size);
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}
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