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Maniphest T1919

Libgcrypt in Gpg4Win has AES-NI support disabled
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Description

Commit 85fb77359606462731eb8ee86398d1895b60196a by werner disabled libgcrypt
AES-NI support in gpg4win

"

There is a problem wit VirtualBox when using AES-NI.  Disabling
AES-NI for gpg-agent seems to be sufficient but we better play safe
and disable it completely.

Note that there is no problem with the Libgcrypt tests programs; even
the backported alignment test for 1.6 works fine.  Needs to be
investigated further.

"

This issue should track the further investigation.

Next steps: build a version with aesni support and try to reproduce the problem
on a system that supports it and in VirtualBox.

Werner can you elaborate on the Test you did? Would just encrypting something
with gpgsm (--cipher-algo AES) be enough?

Event Timeline

• aheinecke added projects: gpg4win, Feature Request, libgcrypt.Mar 9 2015, 6:41 PM
• aheinecke added subscribers: • aheinecke, • werner.
• werner added a comment.Mar 10 2015, 10:56 AM

Since then we did a lot of work on Libgcrypt so that the AES-NI code is
different from May 2012. It is possible that we accidently clobbered a register
which might have been the reason for the VirtualBox failure.

I can't remember the test case, but any use of AES should have hit it. Just use
gpg where AES is the default anyway. I suggest to revert that patch an see what
happens.

• aheinecke added a comment.Sep 4 2015, 12:39 PM

AESNI is enabled in the gnupg 2.1 installer which we will use with gpg4win 3.0

• aheinecke closed this task as Resolved.Sep 4 2015, 12:39 PM