Field Detail

• CHACHA_IV_0

  public static final byte[] CHACHA_IV_0

  12 bytes of zeros

• HEADER_PROT_DATA

  public static final byte[] HEADER_PROT_DATA

  8 bytes of zeros

Method Detail

• acceptTrialDecrypt

  public static void acceptTrialDecrypt(UDPPacket packet,
                                        SSU2Header.Header header)

  Copy the header back to the packet. Cannot be undone.

• decryptDestConnID

  public static long decryptDestConnID(DatagramPacket pkt,
                                       byte[] key1)

  Decrypt bytes 0-7 in header. Packet is unmodified.

  Parameters:

  pkt - must be 8 bytes min

  Returns:

  the destination connection ID

  Throws:

  IndexOutOfBoundsException - if too short

• encryptHandshakeHeader

  public static void encryptHandshakeHeader(UDPPacket packet,
                                            byte[] key1,
                                            byte[] key2)

  First 64 bytes

• encryptLongHeader

  public static void encryptLongHeader(UDPPacket packet,
                                       byte[] key1,
                                       byte[] key2)

  First 32 bytes

• encryptShortHeader

  public static void encryptShortHeader(UDPPacket packet,
                                        byte[] key1,
                                        byte[] key2)

  First 16 bytes. First 8 bytes uses key1 and the next-to-last 12 bytes as the IV. Next 8 bytes uses key2 and the last 12 bytes as the IV.

• trialDecryptHandshakeHeader

  public static SSU2Header.Header trialDecryptHandshakeHeader(UDPPacket packet,
                                                              byte[] key1,
                                                              byte[] key2)

  Session Request and Session Created only. 64 bytes. Packet is unmodified.

  Parameters:

  packet - must be 88 bytes min

  Returns:

  64 byte header, null if data too short

• trialDecryptLongHeader

  public static SSU2Header.Header trialDecryptLongHeader(UDPPacket packet,
                                                         byte[] key1,
                                                         byte[] key2)

  Retry, Token Request, Peer Test only. 32 bytes. Packet is unmodified.

  Parameters:

  packet - must be 56 bytes min

  Returns:

  32 byte header, null if data too short

• trialDecryptShortHeader

  public static SSU2Header.Header trialDecryptShortHeader(UDPPacket packet,
                                                          byte[] key1,
                                                          byte[] key2)

  Session Confirmed and data phase. 16 bytes. Packet is unmodified.

  Parameters:

  packet - must be 40 bytes min

  Returns:

  16 byte header, null if data too short, must be 40 bytes min