[issue17276] HMAC: deprecate default hash

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Having to add a parameter to hmac() in applications to port them to
> Python 3.4 should not be so hard. And using MD5 is really a major
> security issue, don't you think so?

Some uses of md5 don't have anything to do with security. I'm -1
on removing the default value here.

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<http://bugs.python.org/issue17276>
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