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Changes to v4:
- Validate against blktest suite

Nice! thanks hannes, this is going to be very useful moving
forward.

Oh, definitely. The number of issue these tests found...

Great, good that this was useful for you.

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- Fixup base64 decoding

What was fixed up there?

The padding character '=' wasn't handled correctly on decoding (the 
character itself was skipped, by the 'bits' value wasn't increased, 
leading to a spurious error in decoding an any key longer than 32 bit 
not being accepted.

I see.

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- Transform secret with correct hmac algorithm

Is that what I reported last time? Can you perhaps
point me to the exact patch that fixes this?

Well, no, not really; the patch itself got squashed in the main patches.
But problem here was that the key transformation from section 8.13.5.7 
had been using the hash algorithm from the initial challenge, not the 
one specified in the key itself.
This lead to decoding errors when using a key with a different length 
than the hash algorithm.

That is exactly what I reported, changing the key length leads to
authentication errors.