/usr/include/libktorrent/mse/rc4encryptor.h is in libktorrent-dev 1.3.1-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (C) 2005 by Joris Guisson *
* joris.guisson@gmail.com *
* *
* 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 2 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, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
***************************************************************************/
#ifndef MSERC4ENCRYPTOR_H
#define MSERC4ENCRYPTOR_H
#include <gcrypt.h>
#include <util/sha1hash.h>
#include <util/constants.h>
#include <ktorrent_export.h>
using bt::Uint8;
using bt::Uint32;
namespace mse
{
/**
* @author Joris Guisson <joris.guisson@gmail.com>
*
* RC4 encryptor. Uses the RC4 algorithm to encrypt and decrypt data.
* This class has a static encryption buffer, which makes it not thread safe
* because the buffer is not protected by mutexes.
*/
class KTORRENT_EXPORT RC4Encryptor
{
public:
RC4Encryptor(const bt::SHA1Hash & dkey,const bt::SHA1Hash & ekey);
virtual ~RC4Encryptor();
/**
* Decrypt some data, decryption happens in place (original data gets overwritten)
* @param data The data
* @param len Size of the data
*/
void decrypt(Uint8* data,Uint32 len);
/**
* Encrypt the data. Encryption happens into the static buffer.
* So that the data passed to this function is never overwritten.
* If we send pieces we point directly to the mmap region of data,
* this cannot be overwritten, hence the static buffer.
* @param data The data
* @param len The length of the data
* @return Pointer to the static buffer
*/
const Uint8* encrypt(const Uint8* data,Uint32 len);
/**
* Encrypt data, encryption will happen in the same buffer. So data will
* be changed replaced by it's encrypted version.
* @param data The data to encrypt
* @param len The length of the data
*/
void encryptReplace(Uint8* data,Uint32 len);
private:
gcry_cipher_hd_t enc;
gcry_cipher_hd_t dec;
};
}
#endif
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