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31 lines
828 B
C
31 lines
828 B
C
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#pragma once
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#include <Arduino.h>
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/**
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* see docs/software/crypto.md for details.
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*
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* The NONCE is constructed by concatenating:
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* a 32 bit sending node number + a 64 bit packet number + a 32 bit block counter (starts at zero)
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*/
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class CryptoEngine
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{
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public:
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/**
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* Set the key used for encrypt, decrypt.
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*
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* As a special case: If all bytes are zero, we assume _no encryption_ and send all data in cleartext.
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*
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* @param numBytes must be 32 for now (AES256)
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*/
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void setKey(size_t numBytes, const uint8_t *bytes);
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/**
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* Encrypt a packet
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*
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* @param bytes is updated in place
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*/
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void encrypt(uint32_t fromNode, uint64_t packetNum, size_t numBytes, uint8_t *bytes);
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void decrypt(uint32_t fromNode, uint64_t packetNum, size_t numBytes, uint8_t *bytes);
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};
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