mirror of
https://github.com/uroni/urbackup_backend.git
synced 2025-10-26 11:36:50 +00:00
124 lines
3.4 KiB
C++
124 lines
3.4 KiB
C++
/*************************************************************************
|
|
* UrBackup - Client/Server backup system
|
|
* Copyright (C) 2011 Martin Raiber
|
|
*
|
|
* This program 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.
|
|
*
|
|
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
|
|
**************************************************************************/
|
|
|
|
#include "AESDecryption.h"
|
|
|
|
AESDecryption::AESDecryption(const std::string &password)
|
|
{
|
|
m_sbbKey.resize(CryptoPP::SHA256::DIGESTSIZE);
|
|
CryptoPP::SHA256().CalculateDigest(m_sbbKey, (byte*)password.c_str(), password.size() );
|
|
|
|
dec=NULL;
|
|
}
|
|
|
|
AESDecryption::~AESDecryption()
|
|
{
|
|
delete dec;
|
|
}
|
|
|
|
std::string AESDecryption::decrypt(const std::string &data)
|
|
{
|
|
if(dec==NULL)
|
|
{
|
|
size_t done=0;
|
|
if(!iv_buffer.empty() && iv_buffer.size()+data.size()>=16)
|
|
{
|
|
CryptoPP::SecByteBlock m_IV;
|
|
m_IV.resize(16);
|
|
memcpy(m_IV.BytePtr(), &iv_buffer[0], 16);
|
|
memcpy(m_IV.BytePtr()+iv_buffer.size(), &data[0], 16-iv_buffer.size());
|
|
dec=new CryptoPP::CFB_Mode<CryptoPP::AES>::Decryption(m_sbbKey.begin(),m_sbbKey.size(), m_IV.begin() );
|
|
done=16-iv_buffer.size();
|
|
}
|
|
else if(data.size()>=16)
|
|
{
|
|
CryptoPP::SecByteBlock m_IV;
|
|
m_IV.resize(16);
|
|
memcpy(m_IV.BytePtr(), &data[0], 16);
|
|
dec=new CryptoPP::CFB_Mode<CryptoPP::AES>::Decryption(m_sbbKey.begin(),m_sbbKey.size(), m_IV.begin() );
|
|
done=16;
|
|
}
|
|
else
|
|
{
|
|
iv_buffer+=data;
|
|
done=data.size();
|
|
}
|
|
if(done<data.size())
|
|
{
|
|
std::string ret;
|
|
ret.resize(data.size()-done);
|
|
dec->ProcessString((byte*)&ret[0], (byte*)&data[done], ret.size() );
|
|
return ret;
|
|
}
|
|
else
|
|
{
|
|
return "";
|
|
}
|
|
}
|
|
else
|
|
{
|
|
std::string ret;
|
|
ret.resize(data.size());
|
|
dec->ProcessString((byte*)&ret[0], (byte*)&data[0], data.size() );
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
size_t AESDecryption::decrypt(char *data, size_t data_size)
|
|
{
|
|
size_t offset=0;
|
|
if(dec==NULL)
|
|
{
|
|
size_t done=0;
|
|
if(!iv_buffer.empty() && iv_buffer.size()+data_size>=16)
|
|
{
|
|
CryptoPP::SecByteBlock m_IV;
|
|
m_IV.resize(16);
|
|
memcpy(m_IV.BytePtr(), &iv_buffer[0], 16);
|
|
memcpy(m_IV.BytePtr()+iv_buffer.size(), data, 16-iv_buffer.size());
|
|
dec=new CryptoPP::CFB_Mode<CryptoPP::AES>::Decryption(m_sbbKey.begin(),m_sbbKey.size(), m_IV.begin() );
|
|
done=16-iv_buffer.size();
|
|
}
|
|
else if(iv_buffer.empty() && data_size>=16)
|
|
{
|
|
CryptoPP::SecByteBlock m_IV;
|
|
m_IV.resize(16);
|
|
memcpy(m_IV.BytePtr(), data, 16);
|
|
dec=new CryptoPP::CFB_Mode<CryptoPP::AES>::Decryption(m_sbbKey.begin(),m_sbbKey.size(), m_IV.begin() );
|
|
done=16;
|
|
}
|
|
else
|
|
{
|
|
std::string db;
|
|
db.resize(data_size);
|
|
memcpy((char*)db.c_str(), data, data_size);
|
|
iv_buffer+=db;
|
|
done=data_size;
|
|
}
|
|
if(done<data_size)
|
|
{
|
|
dec->ProcessString((byte*)(data+done), data_size-done);
|
|
}
|
|
return done;
|
|
}
|
|
else
|
|
{
|
|
dec->ProcessString((byte*)data, data_size);
|
|
return 0;
|
|
}
|
|
} |