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/* <!-- 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_CONTEXT_H_
#define _D_LIBSSL_ARC4_CONTEXT_H_
#include "common.h"
#include <openssl/evp.h>
#include <openssl/err.h>
#include "DlAbortEx.h"
#include "StringFormat.h"
namespace aria2 {
class LibsslARC4Context {
private:
EVP_CIPHER_CTX* _cipherCtx;
void handleError() const
{
throw DL_ABORT_EX
(StringFormat("Exception in libssl routine(ARC4Context class): %s",
ERR_error_string(ERR_get_error(), 0)).str());
}
public:
LibsslARC4Context():_cipherCtx(0) {}
~LibsslARC4Context()
{
if(_cipherCtx) {
EVP_CIPHER_CTX_cleanup(_cipherCtx);
}
delete _cipherCtx;
}
EVP_CIPHER_CTX* getCipherContext() const
{
return _cipherCtx;
}
// enc == 1: encryption
// enc == 0: decryption
void init(const unsigned char* key, size_t keyLength, int enc)
{
if(_cipherCtx) {
EVP_CIPHER_CTX_cleanup(_cipherCtx);
}
delete _cipherCtx;
_cipherCtx = new EVP_CIPHER_CTX;
EVP_CIPHER_CTX_init(_cipherCtx);
if(!EVP_CipherInit_ex(_cipherCtx, EVP_rc4(), 0, 0, 0, enc)) {
handleError();
}
if(!EVP_CIPHER_CTX_set_key_length(_cipherCtx, keyLength)) {
handleError();
}
if(!EVP_CipherInit_ex(_cipherCtx, 0, 0, key, 0, -1)) {
handleError();
}
}
};
} // namespace aria2
#endif // _D_LIBSSL_ARC4_CONTEXT_H_
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