Method NextPacket

src/crypto/chacha20poly1305.cpp:106–122

}

void FSChaCha20Poly1305::NextPacket() noexcept
{
    if (++m_packet_counter == m_rekey_interval) {
        // Generate a full block of keystream, to avoid needing the ChaCha20 buffer, even though
        // we only need KEYLEN (32) bytes.
        std::byte one_block[ChaCha20Aligned::BLOCKLEN];
        m_aead.Keystream({0xFFFFFFFF, m_rekey_counter}, one_block);
        // Switch keys.
        m_aead.SetKey(std::span{one_block}.first(KEYLEN));
        // Wipe the generated keystream (a copy remains inside m_aead, which will be cleaned up
        // once it cycles again, or is destroyed).
        memory_cleanse(one_block, sizeof(one_block));
        // Update counters.
        m_packet_counter = 0;
        ++m_rekey_counter;
    }
}

void FSChaCha20Poly1305::Encrypt(std::span<const std::byte> plain1, std::span<const std::byte> plain2, std::span<const std::byte> aad, std::span<std::byte> cipher) noexcept
{