[issue12551] Provide data for TLS channel binding

[Jacek Konieczny]

Jacek Konieczny <jajcus at jajcus.net> added the comment:

This patch is functionally equivalent, but advertises 'tls-unique' support in a bit different way.

HAS_TLS_UNIQUE is not exposed in the python 'ssl' module, instead a list 'CHANNEL_BINDING_TYPES' is provided (empty when 'tls-unique' is not supported). get_channel_binding raises ValueError if the argument is not on this list. This way the API can be extended to other channel binding types without adding new constants or functions. Adding a new channel binding type would not need any modifications in the API client code (if it is designed to use arbitrary cb types).

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Added file: http://bugs.python.org/file22652/tls_channel_binding_alt.patch

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<http://bugs.python.org/issue12551>
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