mirror of
https://github.com/zerotier/ZeroTierOne.git
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50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
/*
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* Copyright (c)2019 ZeroTier, Inc.
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file in the project's root directory.
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*
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* Change Date: 2026-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2.0 of the Apache License.
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*/
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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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};
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} // namespace ZeroTier
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#endif
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