Suppressing passphrase prompt

[Steve Butler]

Guess I'll have to start a counter of how many times I post this:

leo:/home/oracle > cat /usr/xrg_dba/bin/gpg_decrypt
#!/bin/ksh
# COPYRIGHT (c) 1995-2002 Stephen M. Butler dba XRG
# This information may be copied, distributed and/or modified under
# certain conditions, but it comes WITHOUT ANY WARRANTY.
# See the Design Science License for more details
# =================================================================
#
#  gpg_decrypt
#     Interface for edi and default routines to decrypt pgp files vi GnuPG.

homedir=$(default gpg_home)

  rm -f "$3" 2>&1 1> /dev/null
  default gpg_pass$1 \
  | gpg --homedir $homedir --passphrase-fd 0 --no-tty --skip-verify \
        --output "$3" --decrypt "$2"
#


Notes: 
1.  default is a utility for looking up default values given the keyword
    A.  gpg_home returns the path to send to the --homedir option.
    B.  gpg_pass$1 returns the passphrase associated with the first command
line
        parameter (I have 2 secret keys -- most everybody is on the 2nd key
now)

2.  Command line parameters:
    $1 -- identifier for which passphrase to return
    $2 -- name of input file to decrypt
    $3 -- name of output file to send the clear text

3.  Usage:  gpg_decyrpt N file_in file_out

The purist will suggest that you set your passphrase to an null string and
run without a passphrase.  The above method has about the same security as
removing your passphrase -- eg, a good hacker will be delayed only a second
or two.


--Steve Butler
Oracle Administrator
First Choice Health Network
206-268-2309
sbutler@fchn.com
    

-----Original Message-----
From: Steven Handleman [mailto:shandleman@geewax.com]
Sent: Friday, June 21, 2002 8:18 AM
To: gnupg-users@gnupg.org
Subject: Suppressing passphrase prompt


Hi All,

I am a new user to GPG and I am hoping that someone on this list can 
provide an easy answer to this.  When I try to sign & encrypt a file (--sign
--
encrypt --armor), gpg prompts me for a passphrase for my secret key.  Is 
there any way to suppress this prompt?  I need to suppress it because the 
encryption is going to become part of an automated batch file.

TIA,
Steven Handleman
IT Manager
Geewax, Terker and Co.
systems@geewax.com


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