Encrypt and decrypt strings with your SSH key

ssh-encrypt.sh

#!/bin/bash

case $1 in
  encrypt)
    pem_path=/tmp/$(basename $1).pem
    ssh-keygen -f $2 -e -m PKCS8 > $pem_path
    openssl rsautl -encrypt -pubin -inkey $pem_path -ssl | base64
    srm $pem_path
  ;;

  decrypt)
    cat | base64 --decode | openssl rsautl -decrypt -inkey $2
  ;;

  *)
    cmd=$(basename $0)
    echo "Usage: $cmd [command] [key path]

Reads from stdin and writes to stdout

Commands:
  encrypt path-to-id_rsa.pub
  decrypt path-to-id_rsa
" 1>&2
    exit 1
  ;;
esac