fix(registry): remove duplicate BLAKE2b-HMAC variant (#752)

[Mehrn0ush]

As discussed in ticket #752, this PR fixes a data-quality issue in the Cryptography Registry.

Fixes #752

Details

• Removes a duplicate BLAKE2b-(160|256|384|512)-HMAC variant entry (primitive: mac)

Scope

• Cryptography Registry data only (schema/cryptography-defs.json)
• No schema or specification behavior changes

[stevespringett]

cc: @bhess

[bhess]

Thank you for highlighting this issue, @Mehrn0ush. Please see my inline comment, it seems to be a typo that caused the duplicate.

[bhess]

The intention was to describe BLAKE2s with HMAC (instead of BLAKE2b), so this appears to be a typo that caused the duplicate. Could you please update the pattern to BLAKE2s-(160|256|384|512)-HMAC rather than removing the entry?

[Mehrn0ush]

Thanks for the review, @bhess — agreed this was a typo.

I updated the entry to preserve both HMAC variants by correcting the duplicate to:

• BLAKE2s-(160|256)-HMAC

Note: BLAKE2s only defines 160/256-bit digests (whereas BLAKE2b supports up to 512), so I kept the size set aligned with the existing BLAKE2s-(160|256) variant.

PR updated (amended) accordingly.

[bhess]

Indeed, thanks!

[bhess]

LGTM