Regarding EVP_EncryptFinal_ex()

       If padding is enabled (the default) then EVP_EncryptFinal_ex() encrypts
       the "final" data, that is any data that remains in a partial block.  It
       uses standard block padding (aka PKCS padding). The encrypted final
       data is written to out which should have sufficient space for one
       cipher block. The number of bytes written is placed in outl. After this
       function is called the encryption operation is finished and no further
       calls to EVP_EncryptUpdate() should be made.


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