[Libreoffice-bugs] [Bug 105844] FILESAVE: Very slow saving compared to 5.2.5

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=105844

--- Comment #9 from Telesto <telesto at surfxs.nl> ---
Created attachment 137784
  --> https://bugs.documentfoundation.org/attachment.cgi?id=137784&action=edit
Bibisect log

Regression introduced by:
author  Michael Stahl <mstahl at redhat.com>       2016-11-09 17:42:46 (GMT)
committer       Michael Stahl <mstahl at redhat.com>       2016-11-09 18:07:20
(GMT)
commit  25205d5b29d0aade0ebd7c6405a91995d02a3a7c (patch)
tree    b59667a739670467f2a8a4ad524cac8640fdb100
parent  2a5bb08a2c84470a7a33547ee478d3c26f7ae159 (diff)
package: ODF: bump PBKDF2 iteration counts
Given recent elections we need to build a higher wall to keep the
government out of our documents, and we will make the government
pay for it.

These iteration counts were considered appropriate a decade ago.

http://security.stackexchange.com/questions/3959/recommended-of-iterations-when-using-pkbdf2-sha256

We get similar numbers on SandyBridge-E desktop and Haswell i7-4600U laptop:
* with 10k iterations ~20 msec per derivation
* with 100k iterations ~195 msec per derivation
* with 150k iterations ~290 msec per derivation

We can't go too high though because in ODF every package stream gets
its own derived key with a different salt, so a document with embedded
images may need a lot of these.

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