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49 lines
1.3 KiB
49 lines
1.3 KiB
/* |
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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: 2023-01-01 |
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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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