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105 lines
3.3 KiB
105 lines
3.3 KiB
/***************************************************************************
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* Copyright (C) 2005 by Tarek Saidi *
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* tarek@linux *
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* *
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* This program 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 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program 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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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#include "SecString.h"
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#include <qmessagebox.h>
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#include <iostream>
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#include "random.h"
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using namespace std;
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Q_UINT8 SecString::Key[32]={0};
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SecString::SecString(){
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data=NULL;
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len=0;
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cryptlen=0;
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}
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SecString::~SecString(){
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//if(data)delete [] data; ///@FIXME zerschießt den Stack, aber warum???
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overwrite(plaintext);
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}
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void SecString::getString(QString & str){
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if(data){
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Rijndael aes;
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int r=aes.init(Rijndael::CBC, Rijndael::Decrypt,Key,Rijndael::Key32Bytes);
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if(r){ cout << "AES error, code " << r << endl;
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exit(-1);}
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char* out=new char[len];
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r=aes.padDecrypt((unsigned char*)data,cryptlen,(unsigned char*)out);
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if(r!=len){ cout << "AES error in SecString::getString(), r!=length, r=" << r << endl;
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exit(-1);}
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str=QString::fromUtf8(out,len);
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overwrite(out,len);
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delete [] out;
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}
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}
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QString& SecString::getString(){
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getString(plaintext);
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return plaintext;
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}
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void SecString::delRef(){
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overwrite(plaintext);
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}
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void SecString::setString(QString& str,bool DelSrc){
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Rijndael aes;
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int r=aes.init(Rijndael::CBC, Rijndael::Encrypt,Key,Rijndael::Key32Bytes);
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if(r){ cout << "AES error, code " << r << endl;
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exit(-1);}
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int il=str.length();
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char* input=new char[il];
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char* output=new char[il+16];
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memcpy(input,str.utf8(),il);
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r=aes.padEncrypt((unsigned char*)input,il,(unsigned char*)output);
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if(r<0){ cout << "AES error, code " << r << endl;
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exit(-1);}
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cryptlen=r;
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len=il;
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if(data)delete [] data;
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data=output;
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overwrite(input,il);
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delete [] input;
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if(DelSrc)overwrite(str);
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}
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void SecString::overwrite(char* str,int strlen){
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if(strlen==0 || str==NULL)return;
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getRandomBytes(str,strlen,1,false);
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}
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void SecString::overwrite(QString &str){
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if(str.length()==0)return;
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char* tmp=new char[str.length()];
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getRandomBytes(tmp,str.length(),1,false);
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str=tmp;
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delete [] tmp;
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}
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int SecString::length(){
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return len;
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}
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void SecString::generateSessionKey(){
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getRandomBytes(Key,32,1,false);
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}
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