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baff23cdd6
This replaces all the separate HMAC-implementing wrappers in the various source files implementing the underlying hashes. The new HMAC code also correctly handles the case of a key longer than the underlying hash's block length, by replacing it with its own hash. This means I can reinstate the test vectors in RFC 6234 which exercise that case, which I didn't add to cryptsuite before because they'd have failed. It also allows me to remove the ad-hoc code at the call site in cproxy.c which turns out to have been doing the same thing - I think that must have been the only call site where the question came up (since MAC keys invented by the main SSH-2 BPP are always shorter than that).