71 lines
2.5 KiB
C++
71 lines
2.5 KiB
C++
/*
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Copyright (c) 2009-2010 Christopher A. Taylor. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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* Neither the name of LibCat nor the names of its contributors may be used
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to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef CAT_COOKIE_JAR_HPP
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#define CAT_COOKIE_JAR_HPP
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#include <cat/crypt/rand/Fortuna.hpp>
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namespace cat {
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class CookieJar
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{
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static const int EXPIRE_TIME = 4000; // ms
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static const int BIN_COUNT = 16; // power of 2
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static const int BIN_TIME = EXPIRE_TIME / BIN_COUNT;
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static const int BIN_MASK = BIN_COUNT - 1;
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u32 key[16];
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u32 Salsa6(u32 *x);
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u32 Hash(u32 ip, u16 port, u32 epoch);
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u32 Hash(const void *address_info, int bytes, u32 epoch);
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u32 GetEpoch();
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u32 ReconstructEpoch(u32 cookie);
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public:
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// Initialize to a random 512-bit key on startup
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void Initialize(FortunaOutput *csprng);
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// Thread-safe and lock-free
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u32 Generate(u32 ip, u16 port);
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u32 Generate(const void *address_info, int bytes); // bytes <= 48
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// Thread-safe and lock-free
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bool Verify(u32 ip, u16 port, u32 cookie);
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bool Verify(const void *address_info, int bytes, u32 cookie); // bytes <= 48
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};
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} // namespace cat
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#endif // CAT_COOKIE_JAR_HPP
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