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RFC 6030 implies that the MAC should be performed over the ciphertext
but some earlier drafts implied that the MAC should be performed on the
plaintext. This change accpets the MAC if either the plaintext or
ciphertext match.
Note that this change allows for a padding oracle attack when CBC
encryption modes are used because decryption (and unpadding) needs to be
done before MAC checking. However, this module is not expected to be
available to users to process arbitrary PSKC files repeatedly.
This removes the tests for a missing MAC key (and replaces it for tests
of missing EncryptionMethod) because falling back to using the
encryption key (implemented in a444f78) in combination with this change
means that decryption is performed before MAC checking and is no longer
possible to trigger a missing MAC key error.
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This uses the encryption key also as MAC key if no MAC key has been
specified in the PSKC file. Earlier versions of the PSKC draft specified
this behaviour.
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In older versions of the PSKC standard it was allowed to have a global
initialization vector for CBC based encryption algorithms. It is
probably not a good idea to re-use an IV in general.
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This puts the test PSKC files in subdirectories so they can be organised
more cleanly.
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