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43 lines
1.2 KiB
43 lines
1.2 KiB
/* This Source Code Form is subject to the terms of the Mozilla Public |
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* License, v. 2.0. If a copy of the MPL was not distributed with this |
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. |
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* |
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* (c) ZeroTier, Inc. |
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* https://www.zerotier.com/ |
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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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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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