wrappers for password-based decrypt/encrypt with age

age-functions.sh

# shred a file if possible, and rm it if not
function shred_file {
  TARGET="$1"
  if [[ -n $TARGET ]] && [[ -f "$TARGET" ]]; then
    type shred >/dev/null 2>&1 && shred -f -u "$TARGET" || rm -f "$TARGET"
  fi
  [[ -n $TARGET ]] && [[ ! -f "$TARGET" ]] && return 0 || return 1
}

# shred a file with user-provided confirmation
function shred_file_confirm {
  TARGET="$1"
  RETURN_CODE=1
  read -p "Remove "$TARGET" [Y/n]? " CONFIRMATION
  CONFIRMATION=${CONFIRMATION:-Y}
  if [[ $CONFIRMATION =~ ^[Yy] ]]; then
    shred_file "$TARGET"
    RETURN_CODE=$?
  fi
  return $RETURN_CODE
}

function encrypt_age() {
  if [[ -n "${1}" ]] && [[ -f "${1}" ]]; then
    OUTPUT="${1}".$(date +%s).age
    age -e -p -o "${OUTPUT}" "${1}" && \
      [[ -f "$OUTPUT" ]] && \
      ls -l "$OUTPUT" && \
      shred_file_confirm "${1}"
  else
    echo "No file specified, or invalid/nonexistant file" >&2
  fi
}

function decrypt_age() {
  if [[ -n "${1}" ]] && [[ -f "${1}" ]]; then
    OUTPUT="$(echo "${1}" | rev | cut -c16- | rev)"
    age -d -o "${OUTPUT}" "${1}" && \
      [[ -f "$OUTPUT" ]] && \
      ls -l "$OUTPUT" && \
      shred_file_confirm "${1}"
  else
    echo "No file specified, or invalid/nonexistant file" >&2
  fi
}