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#!/bin/sh
# A bad password derivation scheme, hopefully portable.
# Requires `expect' to enable `keychain' key unlocking.
# Read source for detail.
PREFIX="Prepended to every password, usually special chars + uppercase"
MIDFIX="A not-necessarily-secret string to prevent pre-baked rainbow tables"
echo -n "Master password: "
# Supress echo, and trap exit for correct restoration
stty -echo
trap 'stty echo' EXIT
# Read without processing at all
IFS=""
read -r MASTER
# Restore state
stty echo
trap - EXIT
echo
USEKEYCHAIN () {
expect - <<EOF
spawn keychain --nogui --quiet $1
set send_slow {1 0.01}
expect {
"Enter passphrase for $HOME/.ssh/$1:"; { send -s "$2\n"; echo DONE; }
}
EOF
echo
}
CALL=echo
if [ "$1" = "-k" ]; then
CALL=USEKEYCHAIN
shift
fi;
for NAME in "$@"; do
PREPASS=$(echo $NAME$MIDFIX$MASTER | sha256sum | cut -b -24)
$CALL $NAME $PREFIX$PREPASS
done
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