Commits on Dec 20, 2022

1. Fix output buffer check introduced in sfackler#1733 …

   Sadly the condition used to relax output buffer checks that depended
   on the `num` parameter does not really hold so this change effectively
   reverts PR sfackler#1733.
   
   As clarified on the OpenSSL mailing list [0] and during integration tests
   the `num` parameter does not reflect the internal buffer cache size thus
   one needs to pessimistically assume that each call to `cipher_update`
   will need sufficient size to contain one additional block. Streaming
   ciphers are not affected by this revert.
   
   [0]: https://mta.openssl.org/pipermail/openssl-users/2022-December/015727.html

   

   wiktor-k committed Dec 20, 2022
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2. Expose Cipher::cipher_final_unchecked …

   This mirrors the `Cipher::cipher_update_unchecked` API call for clients
   that want to manually track the state of internal OpenSSL cipher buffer
   size.

   

   wiktor-k committed Dec 20, 2022
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