wordkey.sh

#!/bin/bash
#
# This script will continually generate random SSH key pairs until it encounters
# a public key that ends in a dictionary word. Maybe it helps you keep track of
# keys, maybe it's just goofy.
#
# Examples:
#   ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIAACUKGU7MtlJ0KHHRzDP9xL+5Yn7zH5lmkG4XOxJpeg
#   ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFF0NVJpm/num+IkOny/n5bVpfLe2Ank31XZ6SjeWIPe
#   ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIKLIZqz/heaJ48QOHfLdeXtJCORmD6iNiLZL1dZPFETa
#   ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIMAvEGEZc+Om30uoO34otsR6Hguj6VAYKnH7Busuveil
#   ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAILhblj+60kd6a1vkn1b6mHI5Kd0IDV9Ewie9e3w6NOUn

DICT="/usr/share/dict/words"

if [ ! -f "${DICT}" ]
then
    echo "No dictionary found. Try: apt install dictionaries-common"
    exit 1
fi

echo "Using size: ${1:-4}"
if [ ${#} -eq 0 ]
then
    echo "Invoke with an argument to override this default. Note that large values may take a very long time to generate."
fi

while :
do
    rm -f key key.pub
    ssh-keygen -q -t ed25519 -f ./key -N ''
    KEY=$(cut -d' ' -f2 < ./key.pub)
    WORD=${KEY: -${1:-4}}
    echo -n .
    grep -iq "^${WORD}$" "${DICT}" && break
done
echo
echo
echo "Found key: ${KEY}"
echo
echo "If you want to keep this key, add a comment and a passphrase:"
echo "  ssh-keygen -c -f key"
echo "  ssh-keygen -p -f key"