[Bug 2521] subtract buffer size from computed rekey limit to avoid exceeding it

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2521

Darren Tucker <dtucker at zip.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Attachment #2778|0                           |1
        is obsolete|                            |
   Attachment #2779|                            |ok?(djm at mindrot.org)
              Flags|                            |

--- Comment #4 from Darren Tucker <dtucker at zip.com.au> ---
Created attachment 2779
  --> https://bugzilla.mindrot.org/attachment.cgi?id=2779&action=edit
Account for actual contents of buffers when calculating rekeying

Patch #2778 solves the problem with the large rekeylimit ciphers but it
still potentially leaves the problems with the others, and using the
same approach on those will rekey significantly more than requested.

An alternative patch that checks the actual buffer usage which should
be more accurate.  Can you confirm that this also solves the problem
you have observed?

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