/* <!-- copyright */
/*
 * aria2 - The high speed download utility
 *
 * Copyright (C) 2006 Tatsuhiro Tsujikawa
 *
 * 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
 *
 * In addition, as a special exception, the copyright holders give
 * permission to link the code of portions of this program with the
 * OpenSSL library under certain conditions as described in each
 * individual source file, and distribute linked combinations
 * including the two.
 * You must obey the GNU General Public License in all respects
 * for all of the code used other than OpenSSL.  If you modify
 * file(s) with this exception, you may extend this exception to your
 * version of the file(s), but you are not obligated to do so.  If you
 * do not wish to do so, delete this exception statement from your
 * version.  If you delete this exception statement from all source
 * files in the program, then also delete it here.
 */
/* copyright --> */
#ifndef D_LIBSSL_ARC4_ENCRYPTOR_H
#define D_LIBSSL_ARC4_ENCRYPTOR_H

#include "common.h"

#include <cstdlib>

#include <openssl/opensslv.h>
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
#  include <openssl/evp.h>
#else // !(OPENSSL_VERSION_NUMBER >= 0x30000000L)
#  include <openssl/rc4.h>
#endif // !(OPENSSL_VERSION_NUMBER >= 0x30000000L)

namespace aria2 {

class ARC4Encryptor {
private:
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  EVP_CIPHER_CTX* ctx_;
#else  // !(OPENSSL_VERSION_NUMBER >= 0x30000000L)
  RC4_KEY key_;
#endif // !(OPENSSL_VERSION_NUMBER >= 0x30000000L)

public:
  ARC4Encryptor();

  ~ARC4Encryptor();

  void init(const unsigned char* key, size_t keyLength);

  // Encrypts data in in buffer to out buffer. in and out can be the
  // same buffer.
  void encrypt(size_t len, unsigned char* out, const unsigned char* in);
};

} // namespace aria2

#endif // D_LIBSSL_ARC4_ENCRYPTOR_H