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Piotr Lizonczyk 368d401701 Improved validation, various additions

noise/builder.py:
- Added guard for data length in decrypt
- Handling InvalidTag exception when AEAD fails
- New NoiseInvalidMessage exception class

noise/exceptions.py
- Three new exception classes

noise/noise_protocol.py
- Implemented rest of validation, now checks for required keypairs, setting initiator/responder role, warns if ephemeral keypairs are set.

noise/patterns.py:
- added name field to every Pattern with pattern name
- added get_required_keypairs method that returns list of keypairs required for given handshake pattern

noise/state.py
- new NoiseMaxNonceError exception

Overall: some TODOs resolved

2017-09-03 13:33:15 +02:00