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path: root/utils.go
AgeCommit message (Collapse)Author
2014-05-13Add vim modelines to some files (No functional changes).Yawning Angel
2014-05-13Add preliminary support for packet length obfuscation.Yawning Angel
The same algorithm as ScrambleSuit is used, except: * SipHash-2-4 in OFB mode is used to create the distribution. * The system CSPRNG is used when sampling the distribution. This fixes most of #3, all that remains is generating and sending a persistent distribution on the server side to the client.
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.
2014-05-12Close connections that fail to authenticate after a while.Yawning Angel
Like ScrambleSuit, a random interval between 1x and 5x of additional data from the peer is read and immediately discarded before closing. Additionally, obfs4 will close off invalid connections anywhere between 0 and 60 seconds after it determines that the incoming connection will never complete the handshake successfully.