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crypto: add support for OCB mode for AEAD

Rodrigo Muino Tomonari requested to merge github/fork/tniessen/crypto-add-ocb-support into master

This change adds support for OCB, the newest and fastest AEAD mode offered by OpenSSL. There are relatively few changes required within the native code, the OCB implementation behaves somewhat like CCM, except that some limitations of CCM don't apply.

As OCB is patented, we will need to check whether this change has any legal implications. The holder of the patents, Phillip Rogaway, has summarized the situation here and I am pretty sure there won't be any problems, but I wouldn't want to be the one to make the decision.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • documentation is changed or added
  • commit message follows commit guidelines

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