Implement a KDFa replacement using OpenSSL's KBKDF function. The resulting
implementation has a few restrictions compared to the original one.
For example, it cannot accept a counter value to be passed in to resume
the KDFa as the reference implementation could -- OSSL does not support
providing the counter in this becomes problematic with DRBG_Generate
where it seems to want to resume with a counter over the long-term.
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
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