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2014-05-21Change the MSS to 1448 bytes, because timestamps are a thing.Yawning Angel
This breaks wireprotocol compatibility.
2014-05-16Change the length field obfscation.Yawning Angel
Instead of including the previous secretbox in the input when calculating the SipHash-2-4 digest used to generate the obfuscation mask, use only the nonce. This is significantly faster, and if someone breaks obfs4 by exploiting the low amount of input entropy between each invocation (a counter incrementing by 1), I hope they publish the attack on the PRF. This breaks wire protocol compatibility.
2014-05-14Change the framing Encoder/Decoder to take the destination slice.Yawning Angel
In theory this is easier on the garbage collector. Probably could reuse more of the intermediary buffers by stashing them in the connection state, but that makes the code kind of messy. This should be an improvement.
2014-05-14Fix comment (No functional changes).Yawning Angel
2014-05-12Fix logging again.Yawning Angel
On second thought instead of using log.Panicf(), panic() and do the logging with recover(). This somewhat centralizes logging in obfs4proxy, which will be easier to change when I invariably decide to do logging differently in the future.
2014-05-12Preliminary support padding, log on panic.Yawning Angel
This adds preliminary support for data padding by adding another layer of encapsulation inside each AEAD frame containing a type and length. For now, data is still sent unpadded, but the infrastructure for supporting it is mostly there. Additionally, use log.Panic[f]() instead of panic through out the code so that some panics are logged.
2014-05-11Change documentation/comments to reflect reality (No functional changes).Yawning Angel
2014-05-09Initial import.Yawning Angel