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UDS: Use the ToDS and FromDS fields to properly calculate the AAD used during encryption.
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@ -103,7 +103,8 @@ static std::array<u8, CryptoPP::AES::BLOCKSIZE> GenerateDataCCMPKey(
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* Generates the Additional Authenticated Data (AAD) for an UDS 802.11 encrypted data frame.
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* @returns a buffer with the bytes of the AAD.
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*/
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static std::vector<u8> GenerateCCMPAAD(const MacAddress& sender, const MacAddress& receiver) {
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static std::vector<u8> GenerateCCMPAAD(const MacAddress& sender, const MacAddress& receiver,
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const MacAddress& bssid, u16 frame_control) {
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// Reference: IEEE 802.11-2007
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// 8.3.3.3.2 Construct AAD (22-30 bytes)
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@ -113,20 +114,34 @@ static std::vector<u8> GenerateCCMPAAD(const MacAddress& sender, const MacAddres
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// Control field are masked to 0.
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struct {
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u16_be FC; // MPDU Frame Control field
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MacAddress receiver;
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MacAddress transmitter;
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MacAddress destination;
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MacAddress A1;
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MacAddress A2;
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MacAddress A3;
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u16_be SC; // MPDU Sequence Control field
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} aad_struct{};
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// Default FC value of DataFrame | Protected | ToDS
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constexpr u16 DefaultFrameControl = 0x0841;
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aad_struct.FC = DefaultFrameControl;
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constexpr u16 AADFrameControlMask = 0x8FC7;
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aad_struct.FC = frame_control & AADFrameControlMask;
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aad_struct.SC = 0;
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aad_struct.transmitter = sender;
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aad_struct.receiver = receiver;
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aad_struct.destination = receiver;
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bool to_ds = (frame_control & (1 << 0)) != 0;
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bool from_ds = (frame_control & (1 << 1)) != 0;
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// In the 802.11 standard, ToDS = 1 and FromDS = 1 is a valid configuration,
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// however, the 3DS doesn't seem to transmit frames with such combination.
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ASSERT_MSG(to_ds != from_ds, "Invalid combination");
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// The meaning of the address fields depends on the ToDS and FromDS fields.
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if (from_ds) {
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aad_struct.A1 = receiver;
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aad_struct.A2 = bssid;
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aad_struct.A3 = sender;
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}
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if (to_ds) {
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aad_struct.A1 = bssid;
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aad_struct.A2 = sender;
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aad_struct.A3 = receiver;
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}
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std::vector<u8> aad(sizeof(aad_struct));
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std::memcpy(aad.data(), &aad_struct, sizeof(aad_struct));
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@ -141,11 +156,12 @@ static std::vector<u8> GenerateCCMPAAD(const MacAddress& sender, const MacAddres
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static std::vector<u8> DecryptDataFrame(const std::vector<u8>& encrypted_payload,
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const std::array<u8, CryptoPP::AES::BLOCKSIZE>& ccmp_key,
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const MacAddress& sender, const MacAddress& receiver,
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u16 sequence_number) {
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const MacAddress& bssid, u16 sequence_number,
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u16 frame_control) {
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// Reference: IEEE 802.11-2007
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std::vector<u8> aad = GenerateCCMPAAD(sender, receiver);
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std::vector<u8> aad = GenerateCCMPAAD(sender, receiver, bssid, frame_control);
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std::vector<u8> packet_number{0,
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0,
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@ -200,10 +216,11 @@ static std::vector<u8> DecryptDataFrame(const std::vector<u8>& encrypted_payload
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static std::vector<u8> EncryptDataFrame(const std::vector<u8>& payload,
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const std::array<u8, CryptoPP::AES::BLOCKSIZE>& ccmp_key,
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const MacAddress& sender, const MacAddress& receiver,
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u16 sequence_number) {
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const MacAddress& bssid, u16 sequence_number,
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u16 frame_control) {
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// Reference: IEEE 802.11-2007
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std::vector<u8> aad = GenerateCCMPAAD(sender, receiver);
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std::vector<u8> aad = GenerateCCMPAAD(sender, receiver, bssid, frame_control);
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std::vector<u8> packet_number{0,
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0,
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