Copy a file to a crypted version.

crpt

#######################################
# Copy a file to a crypted version.
# Globals:
#   CRPT_PASSWORD
# Arguments:
#   Decrypt file ? (optional).
#   Remove file ? (optional).
#   Given source file.
#   Given destination file.
# Returns:
#   0 if file is copied, non-zero on error.
#######################################
crpt() {
	local rm

	declare -a options
	options+=('aes-256-cbc')

	while [[ "$1" = -* ]]; do
		case "$1" in
			-r | --rm) rm='yes' ;;
			-d | --decrypt) options+=('-d') ;;
			*) echo 'Unknown option' >&2; return 1 ;;
		esac
		shift
	done

	if (( $# < 2 )); then
		echo 'Missing arguments' >&2
		return 1
	fi

	if [[ "$1" == "$2" ]]; then
		echo 'Source and destination file names are the same' >&2
		return 1
	fi

	options+=('-salt')
	options+=('-pbkdf2')
	options+=('-in')
	options+=("$1")
	options+=('-out')
	options+=("$2")

	if [[ -n "${CRPT_PASSWORD}" ]]; then
		options+=('-pass')
		options+=('env:CRPT_PASSWORD')
	fi

	if openssl "${options[@]}" && [[ -n "${rm}" ]]; then
		rm -f "$1"
	fi
}