![]() Y Z is the encoding of the record length A B C is the encoding of the ClientHello message length. X numbering scheme, so you can expect the second header byte to remain a 0x03, but you should not arbitrarily limit the third byte. ![]() Other versions may be defined in the future. Currently, defined SSL/TLS versions are SSL 3.0, TLS 1.0, TLS 1.1 and TLS 1.2. ![]() or more, depending on the protocol version used by the client for this first message. So you could expect a payload which begins with the following 9 bytes: 0x16 0x03 X Y Z 0x01 A B C Once the client has sent its ClientHello, then it expects a response from the server, so the ClientHello will be alone in its record. The ClientHello message itself begins with its own four-byte header, with one byte for the message type (0x01 for ClientHello), then the message length over three bytes (there again, big-endian). Theoretically, the client may send the ClientHello split into several records, and it may begin with one or several empty records, but this is not very probable. Protocol version: 2 bytes (0x03 0x00 for SSL 3.0, 0x03 0x01 for TLS 1.0, and so on)įor the first record (from client to server), the client will first send a ClientHello message which is a type of handshake message, hence encapsulated in a record as shown above (the first byte of the record will be 0x16). Record format is: record type: 1 byte (0x16 for "records contains some handshake message data") What should be expected is that the client first send a ClientHello message which itself is contained in one or several records. In SSL/TLS, messages are sent as part of records. ![]()
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