WINDOWS - Adding passphrase to gpg via command line

[Josh Clearihan]

Hi all,

Environment
Windows 2012 Server
GnuPG 2.0.27

Requirement
To automatically decrypt and encrypt files from cmd batch file.

I'm experiencing issues trying to decrypt a .pgp file from command line.

When running this it launches the pinentry window, manually requiring the 
passkey.
gpg2.exe --output D:\Folder --recipient certname --decrypt 
D:\Folder\*.txt.pgp

If I enter the passkey manually in the pinentry box it seems to stay 
active for a number of minutes, allowing me to decrypt multiple files 
without being prompted by pinentry. However, after say 10 - 15 mins when I 
try to decrypt another file, the pinentry windows appears requiring manual 
entry again.

After researching how to set the passkey in the stdin cache I attempted 
this
gpg-preset-passphrase.exe --preset "mypassphrase"
This syntax seems correct because it does not come up invalid, it just 
sits there in cmd on the next line doing nothing
https://www.gnupg.org/documentation/manuals/gnupg/Invoking-gpg_002dpreset_002dpassphrase.html#Invoking-gpg_002dpreset_002dpassphrase

I manually edited my gpg-agent.conf file, it looks like this
###+++--- GPGConf ---+++###
enable-passphrase-history
allow-preset-passphrase
###+++--- GPGConf ---+++### 04/30/15 09:41:02 AUS Eastern Standard Time
# GPGConf edited this configuration file.
# It will disable options before this marked block, but it will
# never change anything below these lines.

I have also tried piping in my passphrase via this command, but this also 
launches pinentry requiring manual entry if the passphrase
echo "mypassphrase"| gpg2.exe --output D:\Folder --recipient certname 
--decrypt D:\Folder\*.txt.pgp

This solution was posted here
http://www.gossamer-threads.com/lists/gnupg/users/59418

Can someone please tell me what I'm doing wrong.

Many Thanks!


Josh Clearihan
Senior Systems Administrator 



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