#!/bin/bash
# create a PGP50 keyring and a PGP 2.6.x keyring.
# Only keys of the participating users are included.
# The list of participating KeyID's has to be in the file filterkeys.

# sig50 is a keyring of PGP 5.x
# signed.pgp is a keyring of PGP 2.6.x

# the filtered keyrings are sig50_filtered (PGP 5.0) and 
# signed_filtered.pgp (PGP 2.6.x)

# ----- Add all keys in signed.pgp to sig50 
pgpk -K sig50 -a signed.pgp

# ----- Extract the keys from the Keyring sig50 and include it 
#       to signed.pgp
rm bla50t
for i in `cat filterkeys`; do 
    echo ----- exporting and importing key 0x$i ; 
    pgpk -xa 0x$i -K sig50 >bla50t ; 
    pgp -ka bla50t signed.pgp ;
done

# ----- filter all keys from sig50 to sig50_filtered
rm bla50
for i in `cat filterkeys`; do echo $i; pgpk -xa 0x$i -K sig50 >>bla50 ; done
pgpk -a bla50 -K sig50_filtered
pgpk -c sig50_filtered 

# ----- filter all keys from signed.pgp to signed_filtered.pgp
rm bla
for i in `cat filterkeys`; do pgp -kxaf 0x$i signed.pgp >>bla ; done
pgp +batchmode -ka bla signed_filtered.pgp
# important to remove PGP 5.x signatures from the keyring:
pgp +batchmode -kc signed_filtered.pgp