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57 lines
1.8 KiB
57 lines
1.8 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.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 "AES.h"
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#include <libdevcore/Common.h>
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#include "CryptoPP.h"
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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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bytes dev::aesDecrypt(bytesConstRef _ivCipher, std::string const& _password, unsigned _rounds, bytesConstRef _salt)
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{
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bytes pw = asBytes(_password);
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if (!_salt.size())
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_salt = &pw;
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bytes target(64);
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CryptoPP::PKCS5_PBKDF2_HMAC<CryptoPP::SHA256>().DeriveKey(target.data(), target.size(), 0, pw.data(), pw.size(), _salt.data(), _salt.size(), _rounds);
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try
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{
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CryptoPP::AES::Decryption aesDecryption(target.data(), 16);
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auto cipher = _ivCipher.cropped(16);
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auto iv = _ivCipher.cropped(0, 16);
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CryptoPP::CBC_Mode_ExternalCipher::Decryption cbcDecryption(aesDecryption, iv.data());
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std::string decrypted;
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CryptoPP::StreamTransformationFilter stfDecryptor(cbcDecryption, new CryptoPP::StringSink(decrypted));
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stfDecryptor.Put(cipher.data(), cipher.size());
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stfDecryptor.MessageEnd();
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return asBytes(decrypted);
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}
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catch (exception const& e)
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{
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cerr << e.what() << endl;
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return bytes();
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}
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}
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