-# generate a subkey with the 'a' usage flags set
-# FIXME: this needs some tweaking to clean it up
-gen_subkey(){
- local keyLength
- local keyExpire
- local keyID
- local gpgOut
- local userID
-
- # set default key parameter values
- keyLength=
- keyExpire=
-
- # get options
- TEMP=$(getopt -o l:e: -l length:,expire: -n "$PGRM" -- "$@")
-
- if [ $? != 0 ] ; then
- exit 1
- fi
-
- # Note the quotes around `$TEMP': they are essential!
- eval set -- "$TEMP"
-
- while true ; do
- case "$1" in
- -l|--length)
- keyLength="$2"
- shift 2
- ;;
- -e|--expire)
- keyExpire="$2"
- shift 2
- ;;
- --)
- shift
- ;;
- *)
- break
- ;;
- esac
- done
-
- keyID="$1"
- if [ -z "$keyID" ] ; then
- failure "You must specify the key ID of your primary key."
- fi
-
- # get key output, and fail if not found
- gpgOut=$(gpg --quiet --fixed-list-mode --list-secret-keys --with-colons \
- "$keyID") || failure
-
- # fail if multiple sec lines are returned, which means the id
- # given is not unique
- if [ $(echo "$gpgOut" | grep '^sec:' | wc -l) -gt '1' ] ; then
- failure "Key ID '$keyID' is not unique."
- fi
-
- # prompt if an authentication subkey already exists
- if echo "$gpgOut" | egrep "^(sec|ssb):" | cut -d: -f 12 | grep -q a ; then
- echo "An authentication subkey already exists for key '$keyID'."
- read -p "Are you sure you would like to generate another one? (y/N) " OK; OK=${OK:N}
- if [ "${OK/y/Y}" != 'Y' ] ; then
- failure "aborting."
- fi
- fi
-
- # set subkey defaults
- # prompt about key expiration if not specified
- if [ -z "$keyExpire" ] ; then
- cat <<EOF
-Please specify how long the key should be valid.
- 0 = key does not expire
- <n> = key expires in n days
- <n>w = key expires in n weeks
- <n>m = key expires in n months
- <n>y = key expires in n years
-EOF
- while [ -z "$keyExpire" ] ; do
- read -p "Key is valid for? (0) " keyExpire
- if ! test_gpg_expire ${keyExpire:=0} ; then
- echo "invalid value"
- unset keyExpire
- fi
- done
- elif ! test_gpg_expire "$keyExpire" ; then
- failure "invalid key expiration value '$keyExpire'."
- fi
-
- # generate the list of commands that will be passed to edit-key
- editCommands=$(cat <<EOF
-addkey
-7
-S
-E
-A
-Q
-$keyLength
-$keyExpire
-save
-EOF
-)
-
- log "generating subkey..."
- echo "$editCommands" | gpg --expert --command-fd 0 --edit-key "$keyID"
- log "done."
-}
-