[issue6473] hmac sha384/sha512 fails test vectors

[Antoine Pitrou]

Changes by Antoine Pitrou <pitrou at free.fr>:


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priority:  -> critical
stage:  -> needs patch
versions: +Python 2.6, Python 2.7, Python 3.1, Python 3.2 -Python 2.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue6473>
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