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don't break strict-aliasing rules

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This commit is contained in:
Kevin Hester 2021-08-02 10:50:28 -07:00
parent 596befff74
commit 2fe11d4fe8
1 changed files with 6 additions and 2 deletions
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8
src/mesh/CryptoEngine.cpp
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@ -32,6 +32,10 @@ void CryptoEngine::decrypt(uint32_t fromNode, uint64_t packetNum, size_t numByte
void CryptoEngine::initNonce(uint32_t fromNode, uint64_t packetNum) void CryptoEngine::initNonce(uint32_t fromNode, uint64_t packetNum)
{ {
memset(nonce, 0, sizeof(nonce)); memset(nonce, 0, sizeof(nonce));
*((uint64_t *)&nonce[0]) = packetNum;
*((uint32_t *)&nonce[8]) = fromNode; // use memcpy to avoid breaking strict-aliasing
memcpy(nonce, &packetNum, sizeof(uint64_t));
memcpy(nonce + sizeof(uint64_t), &fromNode, sizeof(uint32_t));
//*((uint64_t *)&nonce[0]) = packetNum;
//*((uint32_t *)&nonce[8]) = fromNode;
} }