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/*
* ZeroTier One - Network Virtualization Everywhere
* Copyright (C) 2011-2018 ZeroTier, Inc. https://www.zerotier.com/
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*
* --
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial closed-source software that incorporates or links
* directly against ZeroTier software without disclosing the source code
* of your own application.
*/
#ifndef ZT_POLY1305_HPP
#define ZT_POLY1305_HPP
namespace ZeroTier {
#define ZT_POLY1305_KEY_LEN 32
#define ZT_POLY1305_MAC_LEN 16
/**
* Poly1305 one-time authentication code
*
* This takes a one-time-use 32-byte key and generates a 16-byte message
* authentication code. The key must never be re-used for a different
* message.
*
* In Packet this is done by using the first 32 bytes of the stream cipher
* keystream as a one-time-use key. These 32 bytes are then discarded and
* the packet is encrypted with the next N bytes.
*/
class Poly1305
{
public:
/**
* Compute a one-time authentication code
*
* @param auth Buffer to receive code -- MUST be 16 bytes in length
* @param data Data to authenticate
* @param len Length of data to authenticate in bytes
* @param key 32-byte one-time use key to authenticate data (must not be reused)
*/
static void compute(void *auth,const void *data,unsigned int len,const void *key);
};
} // namespace ZeroTier
#endif
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