mirror of
https://github.com/didyouexpectthat/zerotierone.git
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56 lines
1.7 KiB
C++
56 lines
1.7 KiB
C++
/*
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* ZeroTier One - Network Virtualization Everywhere
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* Copyright (C) 2011-2016 ZeroTier, Inc. https://www.zerotier.com/
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ZT_POLY1305_HPP
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#define ZT_POLY1305_HPP
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namespace ZeroTier {
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#define ZT_POLY1305_KEY_LEN 32
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#define ZT_POLY1305_MAC_LEN 16
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/**
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* Poly1305 one-time authentication code
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*
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* This takes a one-time-use 32-byte key and generates a 16-byte message
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* authentication code. The key must never be re-used for a different
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* message.
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*
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* In Packet this is done by using the first 32 bytes of the stream cipher
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* keystream as a one-time-use key. These 32 bytes are then discarded and
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* the packet is encrypted with the next N bytes.
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*/
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class Poly1305
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{
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public:
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/**
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* Compute a one-time authentication code
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*
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* @param auth Buffer to receive code -- MUST be 16 bytes in length
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* @param data Data to authenticate
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* @param len Length of data to authenticate in bytes
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* @param key 32-byte one-time use key to authenticate data (must not be reused)
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*/
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static void compute(void *auth,const void *data,unsigned int len,const void *key)
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throw();
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};
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} // namespace ZeroTier
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#endif
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