[pkg-gnupg-maint] Bug#847552: gnupg: decrypting after X pinentry is sometimes slow: around 10 seconds on a small file

[Jochen Sprickerhof]

Package: gnupg
Version: 2.1.16-3
Followup-For: Bug #847552

Dear Maintainer,

I have the same problem. stracing gpg -d gives me a lot of this:

"S PROGRESS need_entropy X 30 120"..., 1002) = 33
read(6, "S PROGRESS need_entropy X 120 12"..., 1002) = 34
read(6, "S PROGRESS need_entropy X 30 120"..., 1002) = 33
read(6, "S PROGRESS need_entropy X 120 12"..., 1002) = 34
read(6, "S PROGRESS need_entropy X 30 120"..., 1002) = 33

which led me to this patch:

https://git.gnupg.org/cgi-bin/gitweb.cgi?p=gnupg.git;a=commit;h=4473db1ef24031ff4e26c9a9de95dbe898ed2b97

With the patch reverted, the 10 seconds delay is gone.
Note that I have no idea about security implications of this revert, nor why it
needs entropy when doing gpg -d.

Cheers Jochen

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.8.0-1-amd64 (SMP w/12 CPU cores)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)

Versions of packages gnupg depends on:
ii  gnupg-agent    2.1.16-3
ii  libassuan0     2.4.3-2
ii  libbz2-1.0     1.0.6-8
ii  libc6          2.24-8
ii  libgcrypt20    1.7.5-2
ii  libgpg-error0  1.25-2
ii  libksba8       1.3.5-2
ii  libreadline7   7.0-1
ii  libsqlite3-0   3.15.2-1
ii  zlib1g         1:1.2.8.dfsg-4

Versions of packages gnupg recommends:
ii  dirmngr     2.1.16-3
pn  gnupg-l10n  <none>

Versions of packages gnupg suggests:
pn  parcimonie  <none>
pn  xloadimage  <none>

-- no debconf information