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Provide internal ARC4 implementation
Now you can build bittorrent support without without external libraries, meaning you can skip libnettle, libgmp, libgcrypt, GnuTLS and OpenSSL on OSX (for now).
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/* <!-- copyright */ | ||
/* | ||
* aria2 - The high speed download utility | ||
* | ||
* Copyright (C) 2013 Nils Maier | ||
* | ||
* 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 --> */ | ||
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#include "InternalARC4Encryptor.h" | ||
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namespace aria2 { | ||
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ARC4Encryptor::~ARC4Encryptor() | ||
{ | ||
for (auto& c : state_) c = 0; | ||
i = j = 0; | ||
} | ||
void ARC4Encryptor::init(const unsigned char* key, size_t keyLength) | ||
{ | ||
j = 0; | ||
for (auto& c : state_) c = j++; | ||
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j = 0; | ||
for (i = 0; i < sizeof(state_); ++i) { | ||
j = (j + state_[i] + key[i % keyLength]) & 0xff; | ||
auto tmp = state_[i]; | ||
state_[i] = state_[j]; | ||
state_[j] = tmp; | ||
} | ||
i = j = 0; | ||
} | ||
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void ARC4Encryptor::encrypt(size_t len, unsigned char* out, | ||
const unsigned char* in) | ||
{ | ||
for (auto c = 0; c < len; ++c) { | ||
i = (i + 1) & 0xff; | ||
j = (j + state_[i]) & 0xff; | ||
auto sj = state_[i]; | ||
auto si = state_[i] = state_[j]; | ||
state_[j] = sj; | ||
out[c] = in[c] ^ state_[(si + sj) & 0xff]; | ||
} | ||
} | ||
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} // namespace aria2 |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,60 @@ | ||
/* <!-- copyright */ | ||
/* | ||
* aria2 - The high speed download utility | ||
* | ||
* Copyright (C) 2013 Nils Maier | ||
* | ||
* 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_INTERNAL_ARC4_ENCRYPTOR_H | ||
#define D_INTERNAL_ARC4_ENCRYPTOR_H | ||
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#include "common.h" | ||
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namespace aria2 { | ||
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class ARC4Encryptor { | ||
private: | ||
unsigned char state_[256]; | ||
unsigned i, j; | ||
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public: | ||
ARC4Encryptor() {} | ||
~ARC4Encryptor(); | ||
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void init(const unsigned char* key, size_t keyLength); | ||
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// 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); | ||
}; | ||
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} // namespace aria2 | ||
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#endif // D_INTERNAL_ARC4_ENCRYPTOR_H |
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