Method ReceivePacket

src/test/net_tests.cpp:1254–1283

Expect a packet to have been received from transport, process it, and return its contents * (only after ReceiveKey). Decoys are skipped. Optional associated authenticated data (AAD) is * expected in the first received packet, no matter if that is a decoy or not. */

     *  (only after ReceiveKey). Decoys are skipped. Optional associated authenticated data (AAD) is
     *  expected in the first received packet, no matter if that is a decoy or not. */
    std::vector<uint8_t> ReceivePacket(std::span<const std::byte> aad = {})
    {
        std::vector<uint8_t> contents;
        // Loop as long as there are ignored packets that are to be skipped.
        while (true) {
            // When processing a packet, at least enough bytes for its length descriptor must be received.
            BOOST_REQUIRE(m_received.size() >= BIP324Cipher::LENGTH_LEN);
            // Decrypt the content length.
            size_t size = m_cipher.DecryptLength(MakeByteSpan(std::span{m_received}.first(BIP324Cipher::LENGTH_LEN)));
            // Check that the full packet is in the receive buffer.
            BOOST_REQUIRE(m_received.size() >= size + BIP324Cipher::EXPANSION);
            // Decrypt the packet contents.
            contents.resize(size);
            bool ignore{false};
            bool ret = m_cipher.Decrypt(
                /*input=*/MakeByteSpan(
                    std::span{m_received}.first(size + BIP324Cipher::EXPANSION).subspan(BIP324Cipher::LENGTH_LEN)),
                /*aad=*/aad,
                /*ignore=*/ignore,
                /*contents=*/MakeWritableByteSpan(contents));
            BOOST_CHECK(ret);
            // Don't expect AAD in further packets.
            aad = {};
            // Strip the processed packet's bytes off the front of the receive buffer.
            m_received.erase(m_received.begin(), m_received.begin() + size + BIP324Cipher::EXPANSION);
            // Stop if the ignore bit is not set on this packet.
            if (!ignore) break;
        }
        return contents;
    }

    /** Expect garbage and garbage terminator to have been received, and process them (only after
     *  ReceiveKey). */